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! WARNING:Improper installation, adjustment, al-teration, service, or maintenance cancause injury or property damage. Referto this manual. For assistance oradditional information consult a quali-fied installer, service agency, or thegas supplier.
! FOR YOUR SAFETY:Do not store or use gasoline or otherflammable vapors and liquids in the vi-cinity of this or any other appliance.
Gas Furnaces
Installation Instructions*RA Full Size Series 80+ High Efficiency Upflow/Horizontal*RK Full Size Series 80+ High Efficiency Downflow
WHAT TO DO IF YOUSMELL GAS:
• Do not try to light any appliance.
• Do not touch any electrical switch; do notuse any phone in your building.
• Immediately call your gas supplier from aneighbor’s phone. Follow the gas supplier’sinstructions.
• If you cannot reach your gas supplier, callthe fire department.
• Extinguish any open flame.
*RA 80+ Upflow/Horizontal *RK 80+ Downflow
These instructions are primarily intended to assist qualified individuals experienced in the proper installation ofthis appliance. Some local codes require licensed installation/service personnel for this type of equipment. Readall instructions carefully before starting the installation.
Table of ContentsFurnace Specifications ................................................................................................................. 4-5
Upflow/Horizontal Models ....................................................................................................... 4Downflow Models .................................................................................................................... 5Capacities-Furnace Airflow Data ........................................................................................ 6-7
Safety Information ............................................................................................................................. 8Installation Requirements ............................................................................................................... 9Supply Air Plenum Installation ..................................................................................................... 11
Installation on a Concrete Slab ........................................................................................... 11Installation on a Combustible Floor .................................................................................... 11
Venting and Combustion Air Requirements ................................................................................ 12General ................................................................................................................................. 12Installation in an Unconfined Space ................................................................................... 12Installation in a Confined Space ......................................................................................... 13
Horizontal Furnace Installation ................................................................................... 13Air From Inside ............................................................................................................. 14Outdoor Air Using Vertical Ducts ................................................................................ 14Air Directly Through an Exterior Wall .......................................................................... 14Outdoor Air Using A Crawl Space and Ventilated Attic ............................................ 15Outdoor Air Through Horizontal Ducts ....................................................................... 15
Venting Requirements .................................................................................................................... 15General ................................................................................................................................. 15Category I - Common Venting ............................................................................................. 16Category III - Horizontal Venting ......................................................................................... 17
Horizontal Venting for Upflow Models ........................................................................ 17Horizontal Venting for Downflow Models ................................................................... 18
Horizontal Power Venting .................................................................................................... 19Vent Termination Clearance ................................................................................................ 20Location of Outdoor Terminations ....................................................................................... 21
Horizontal Installation .................................................................................................. 21Flexible Vent Systems .......................................................................................................... 22
Circulating Air Supply .................................................................................................................... 22General ................................................................................................................................. 22Return Air .............................................................................................................................. 22
Gas Supply and Piping .................................................................................................................. 23General ................................................................................................................................. 23Leak Check ........................................................................................................................... 23Conversion ............................................................................................................................ 23High-Altitude Application ...................................................................................................... 24Natural Gas High Altitude Conversion ................................................................................ 25LP/Propane Gas Sea Level and High Altitude Conversion .............................................. 25
Electrical Wiring ............................................................................................................................. 26General ................................................................................................................................. 26Line Voltage Wiring .............................................................................................................. 26Low Voltage Wiring ............................................................................................................... 27
Start-up & Adjustments .................................................................................................................. 28General ................................................................................................................................. 28Start-Up Procedures ............................................................................................................. 28Verifying and Adjusting Firing Rate .................................................................................... 28Verifying and Adjusting Temperature Rise .................................................................... 28-30Verifying Burner Operation .................................................................................................. 30Verifying Operation of Supply Air Limit Switch ................................................................... 30
Description of Components ........................................................................................................... 30Wiring Diagram ................................................................................................................................ 31Maintenance ..................................................................................................................................... 32
Vent System .......................................................................................................................... 32Air Filter(s) .............................................................................................................................. 32Lubrication ............................................................................................................................ 33Blower Compartment ............................................................................................................ 33Heat Exchanger and Burner Maintenance ......................................................................... 33Cleaning of Flue Passages ................................................................................................. 33Cleaning of Burners ............................................................................................................. 34
System Operation Information ...................................................................................................... 34General ................................................................................................................................. 34Sequence of Operation ....................................................................................................... 34
Heating Mode ............................................................................................................... 34Cooling Mode ............................................................................................................... 35Fan Mode ..................................................................................................................... 35
Furnace Fails to Operate ..................................................................................................... 35Twinning ................................................................................................................................ 36
Installation/Performance Checklist ............................................................................................. 36
4
FURNACE SPECIFICATIONS - Upflow/Horizontal Models
Figure 1A. Upflow Unit Dimensions
Table 1A. Upflow Furnace Dimensions and Shipping Weights
Unit Shown in Upflow Position Rotate 90˚ Clockwise or Counter Clockwise for Horizontal Application
23 3/4
19 3/4
3/4
43
25 1/8
25 1/4 25 5/8
23
27 5/8
15 20 1/2
251/4
33301/4
A
B
C
FLUEOUTLET
11/2 X 31/2 Cut-out for Gas Connection
3/4 3/4
11/4
3/4
7/8 Cut-out for Electric Connection
11/2 X 31/2 Cut-out for Gas Connection
7/8 Cut-out for Electric Connection
Return Air Opening
(Side)
1 1/4 1 1/4D 23Return Air Opening
(Bottom)7/8
Note: (*) Can be C or N
Furnace Dimensions ShippingModel Input A B C Flue Outlet Weight D*RA (Btuh) (in.) (in.) (in.) (in.) (lbs) (IN.)
045(*)-08 45,000 14 1/4 12 3/4 3 1/4 3 123 11 3/4
060(*)-12 60,000 14 1/4 12 3/4 3 3/4 4 134 11 3/4
072(*)-12 72,000 14 1/4 12 3/4 3 3/4 4 135 11 3/4
072(*)-16 72,000 19 3/4 18 1/4 3 3/4 4 152 17 1/4
072(*)-17 72,000 14 1/4 12 3/4 3 3/4 4 135 11 3/4
096(*)-12 96,000 19 3/4 18 1/4 3 3/4 4 163 17 1/4
096(*)-16 96,000 19 3/4 18 1/4 3 3/4 4 163 17 1/4
096(*)-20 96,000 22 1/2 21 3 3/4 4 174 20
120(*)-16 120,000 19 3/4 18 1/4 3 3/4 4 174 17 1/4
120(*)-20 120,000 22 1/2 21 3 3/4 4 182 20
144(*)-20 144,000 22 1/2 21 4 1/4 5 194 20
FURNACE DIMENSIONS ANDSHIPPING WEIGHTS
5
FURNACE SPECIFICATIONS - Downflow Models
Figure 1B. Downflow Unit Dimensions
Cut-out for Electric ConnectionBoth sides
Cut-out for Gas Connection1-1/2 x 3-1/2 (both sides)
27 7/8"
3/4"
23 5/8"
19 3/4" 3/4"
C
CL
3/4"
3/4"
43"
4" Dia. Vent
Cut - out for Gas Connection
A
B
B
25"
15 1/2"
27 1/8"
25"
3/4"
CL
(Bottom Opening)(Bottom Opening)
10 1/4"
24 1/2"
19 3/4"
Table 1B. Downflow Furnace Dimensions and Shipping Weights
Model Furnace ShippingNumber Input A B C Weights
*RK (Btuh) inches inches inches (lbs)060(*)-12 60,000 14 1/4 12 3/4 5 1/2 134072(*)-12 72,000 14 1/4 12 3/4 5 1/2 135072(*)-16 72,000 19 3/4 18 1/4 11 147096(*)-12 96,000 19 3/4 18 1/4 11 154096(*)-16 96,000 19 3/4 18 1/4 11 156120(*)-20 120,000 19 3/4 18 1/4 11 182135(*)-20 135,000 19 3/4 18 1/4 11 182
DOWNFLOW FURNACE MODELSFURNACE DIMENSIONS AND
SHIPPING WEIGHTSDimensions
Note: (*) Can be C or N
6
CAPACITIES —Furnace Airflow Data
Table 2. Furnace Airflow Data
80+
UP
FL
OW
/HO
RIZ
ON
TA
L F
UR
NA
CE
MO
DE
LS
** F
acto
ry S
et C
oolin
g S
peed
** F
acto
ry S
et H
eatin
g S
peed
NO
TES
:1.
Airf
low
rat
es o
f 180
0 C
FM
or
mor
e re
quire
two
retu
rn a
ir co
nnec
tions
. D
ata
is fo
r op
erat
ion
with
filte
r(s)
.2.
Tem
pera
ture
ris
es in
the
tabl
e ar
e ap
prox
imat
e. A
ctua
l tem
pera
ture
ris
es m
ay v
ary.
3. T
empe
ratu
re r
ises
and
airf
low
s fo
r ex
tern
al s
tatic
pre
ssur
es g
reat
er th
an 0
.5 a
re fo
r re
fere
nce
only
. T
hese
c
ondi
tions
are
not
rec
omm
ende
d.
† C
an b
e C
or
N.
Mo
tor
Mo
tor
Sp
eed
HP
CF
MR
ise
CF
MR
ise
CF
MR
ise
CF
MR
ise
CF
MR
ise
CF
MR
ise
CF
MR
ise
CF
MR
ise
Hig
h*10
0033
970
3495
035
920
3687
038
820
4177
043
700
48M
ediu
m**
1/5
760
4474
045
730
4672
046
690
4867
050
640
5262
054
Low
630
5362
054
610
5560
056
570
5854
062
510
6547
071
Hig
h*13
8032
1350
3313
1034
1260
3512
1037
1150
3910
8041
1000
44M
ediu
m**
1/3
1220
3611
9037
1160
3811
2040
1070
4210
2044
950
4788
051
Low
820
5480
056
780
5776
058
730
6170
063
670
6664
069
Hig
h*13
8039
1350
4013
1041
1260
4212
1044
1150
4610
8049
1000
53M
ediu
m**
1/3
1220
4411
9045
1160
4611
2048
1070
5010
2052
950
5688
061
Low
820
6580
067
780
6876
070
730
7370
076
670
8064
083
Hig
h*19
8027
1910
2818
3029
1760
3016
6032
1570
3414
6037
1350
40M
ed-H
igh
1/2
1710
3116
6032
1610
3315
4035
1470
3613
9038
1300
4112
0044
Med
-Low
**14
9036
1470
3614
2038
1380
3913
2040
1250
4311
7046
1090
49Lo
w12
7042
1250
4312
3043
1190
4511
4047
1080
4910
1053
920
58H
igh*
1950
2719
0028
1810
2918
1029
1770
3017
3031
1700
3116
7032
Med
-Hig
h3/
415
0036
1450
3714
2038
1380
3913
4040
1310
4112
8042
1250
43M
ed-L
ow**
1160
4611
3047
1090
4910
6050
1030
5298
054
940
5790
059
Low
910
5987
061
840
6381
066
770
6974
072
710
7568
078
Hig
h*15
3046
1450
4913
9051
1300
5512
2058
1130
6310
4068
940
76M
ediu
m**
1/3
1380
5213
2054
1250
5711
9060
1100
6510
2070
920
7782
087
Low
930
7690
079
870
8282
087
750
9567
010
658
012
347
015
1H
igh*
1980
3619
1037
1840
3917
6040
1680
4215
9045
1500
4714
1050
Med
-Hig
h**
1/2
1720
4116
7043
1610
4415
6046
1480
4814
1050
1320
5412
3058
Med
-Low
1470
4814
4049
1410
5013
7052
1320
5412
7056
1200
5911
3063
Low
1270
5612
4057
1220
5811
9060
1140
6210
9065
1040
6897
073
Hig
h*24
3529
2410
3023
7530
2335
3022
9031
2215
3221
3533
2035
35M
ed-H
igh*
*3/
420
1535
2015
3520
0535
1975
3619
4537
1905
3718
9538
1865
38M
ed-L
ow16
9842
1695
4216
8042
1660
4316
4543
1600
4415
5546
1495
48Lo
w14
5049
1440
4914
2050
1400
5113
7552
1360
5213
4053
1315
54H
igh*
2340
3022
9031
2280
3121
8033
2150
3320
8034
2000
3619
2037
Med
-Hig
h3/
419
1037
1880
3818
6038
1830
3918
1039
1790
4017
7040
1750
41M
ed-L
ow**
1520
4715
1047
1490
4814
8048
1460
4914
4049
1420
5014
0051
Low
1370
5213
5053
1340
5313
2054
1300
5512
8056
1260
5612
3058
Hig
h*19
0047
1830
4917
5051
1630
5515
8056
1490
6014
0063
1320
67M
ed-H
igh*
*1/
217
2052
1670
5316
1055
1560
5714
8060
1410
6313
2067
1230
72M
ed-L
ow14
5061
1420
6313
8064
1340
6612
8069
1220
7311
5077
1070
83Lo
w12
6071
1230
7212
0074
1170
7611
2079
1070
8310
2087
960
93H
igh*
2300
3922
5040
2190
4121
3042
2090
4320
4044
2000
4419
5046
Med
-Hig
h**
3/4
1910
4718
8047
1860
4818
3049
1800
4917
7050
1740
5117
0052
Med
-Low
1540
5815
3058
1520
5815
0059
1480
6014
5061
1420
6313
9064
Low
1320
6713
1068
1300
6812
8069
1260
7112
3072
1200
7411
7076
Hig
h*22
4048
2190
4921
3050
2070
5220
2053
1960
5419
1056
1850
58M
ed-H
igh*
*3/
419
0056
1860
5718
2059
1780
6017
4061
1700
6316
6064
1620
66M
ed-L
ow15
2070
1510
7114
9072
1480
7214
5074
1420
7513
9077
1360
78Lo
w13
3080
1310
8112
9083
1280
8312
5085
1230
8712
1088
1180
90
Ext
ern
al S
tati
c P
ress
ure
(In
ches
Wat
er C
olu
mn
)0.
10.
20.
30.
40.
50.
60.
70.
8M
od
elH
eati
ng
Nu
mb
erIn
pu
t*R
A-
(Btu
h)
045(
†)-0
8A45
000
060(
†)-1
2A60
000
072(
†)-1
2A72
000
072(
†)-1
6B72
000
072(
†)-1
7A72
000
096(
†)-1
2B96
000
096(
†)-1
6B96
000
096(
†)-2
0B96
000
096(
†)-2
0C96
000
120(
†)-1
6B12
0000
120(
†)-2
0C12
0000
144(
†)-2
0C14
4000
7
Table 2A. Furnace Airflow Data
** F
acto
ry S
et C
oolin
g S
peed
** F
acto
ry S
et H
eatin
g S
peed
- N
ot R
ecom
men
ded
NO
TES
:1.
Airf
low
rat
es o
f 180
0 C
FM
or
mor
e re
quire
two
retu
rn a
ir co
nnec
tions
. D
ata
is fo
r op
erat
ion
with
filte
r(s)
.2.
Tem
pera
ture
ris
es in
the
tabl
e ar
e ap
prox
imat
e. A
ctua
l tem
pera
ture
ris
es m
ay v
ary.
3. T
empe
ratu
re r
ises
and
airf
low
s fo
r ex
tern
al s
tatic
pre
ssur
es g
reat
er th
an 0
.5 a
re fo
r re
fere
nce
only
. T
hese
c
ondi
tions
are
not
rec
omm
ende
d.
80+
DO
WN
FL
OW
FU
RN
AC
E M
OD
EL
S
† C
an b
e C
or
N.
CF
M
Ris
eC
FM
R
ise
CF
M
Ris
eC
FM
R
ise
CF
M
Ris
eC
FM
R
ise
CF
M
Ris
eC
FM
R
ise
1380
-13
45-
1330
-12
6036
1230
3711
9038
1160
3911
2040
1180
3811
4540
1130
4011
1041
1080
4210
6043
1040
4410
1045
830
5581
056
805
5679
557
780
5877
059
760
6075
060
1380
-13
45-
1330
-12
60-
1230
-11
9046
1160
4711
2049
1180
4611
4547
1130
4811
1049
1080
5010
6051
1040
5210
1054
830
6581
067
805
6779
568
780
7077
071
760
7175
072
1380
-13
45-
1330
-12
60-
1230
-11
9046
1160
4711
2049
1180
4611
4547
1130
4811
1049
1080
5010
6051
1040
5210
1054
830
6581
067
805
6779
568
780
7077
071
760
7175
072
1850
-17
90-
1775
-17
55-
1735
-17
00-
1680
-16
50-
1460
-14
3538
1420
3814
0039
1380
3913
6040
1340
4113
2041
1210
4511
9545
1180
4611
6047
1140
4811
2049
1110
4910
9050
1020
5310
1054
995
5597
556
955
5794
058
930
5891
060
1475
4914
6050
1445
5014
3051
1410
5114
0052
1380
5213
6053
1200
6011
9561
1180
6111
6562
1145
6311
4064
1120
6511
1065
795
-78
5-
770
-75
5-
735
-72
0-
710
-69
0-
1950
-18
90-
1865
-18
35-
1805
4017
7041
1730
4217
0043
1600
4515
8046
1555
4715
2548
1495
4814
7049
1450
5014
2051
1375
5313
6053
1335
5413
0556
1275
5712
5058
1230
5912
0060
1180
6111
6562
1140
6411
1065
1080
6710
6068
1030
7010
10-
2440
-23
95-
2385
-23
75-
2360
-23
40-
2320
-23
00-
1920
4719
1047
1900
4818
9048
1875
4818
7048
1860
4918
4049
1630
5616
2056
1610
5616
0057
1585
5715
8057
1570
5815
5058
1430
6314
2564
1415
6414
0564
1390
6513
8066
1370
6613
6067
2440
4123
9542
2385
4223
7542
2360
4223
4043
2320
4323
0044
1920
5119
1052
1900
5218
9053
1875
5318
7053
1860
5418
4055
1630
6116
2062
1610
6216
0063
1585
6315
8063
1570
6415
5065
1430
6914
2570
1415
7014
05-
1390
-13
80-
1370
-13
60-
EX
TE
RN
AL
ST
AT
IC P
RE
SS
UR
E (
INC
HE
S O
F W
AT
ER
CO
LUM
N)
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
MO
DE
L N
UM
BE
RH
EA
TIN
GM
OT
OR
MO
TO
R*R
KIN
PU
TS
PE
ED
HP
HIG
H*
060(
†)-1
2A60
,000
ME
DIU
M**
1/3
LOW
HIG
H07
2(†)
-08A
72,0
00M
ED
IUM
**1/
3LO
W*
HIG
H*
072(
†)-1
2A72
,000
ME
DIU
M**
1/3
LOW
HIG
H*
072(
†)-1
6BM
ED
-HIG
H1/
272
,000
ME
D-L
OW
**LO
W
HIG
H*
096(
†)-1
2B96
,000
ME
DIU
M**
1/3
LOW
HIG
H*
ME
D-H
IGH
**1/
209
6(†)
-16B
96,0
00M
ED
-LO
WLO
W
HIG
H*
120(
†)-2
0BM
ED
-HIG
H**
3/4
120,
000
ME
D-L
OW
LOW
HIG
H*
135(
†)-2
0BM
ED
-HIG
H**
3/4
135,
000
ME
D-L
OW
LOW
8
SAFETY INFORMATION
1. Use only with type of gas approved for thisfurnace. Refer to the furnace rating plate.
2. Install this furnace only in a location and positionas specified on Table 3 of these instructions.
3. Provide adequate combustion and ventilationair to the furnace space as specified on Pages12 through 19.
4. Combustion products must be dischargedoutdoors. Connect this furnace to an approvedvent system only, as specified on Pages 15through 19.
5. Never test for gas leaks with an open flame. Usea commercially available soap solution madespecifically for the detection of leaks to checkall connections, as specified on Page 23 ofthese instructions.
6. Always install furnace to operate within thefurnace’s intended temperature-rise range witha duct system which has an external staticpressure within the allowable range, as speci-fied on Table 2 of these instructions. Seefurnace rating plate.
7. When a furnace is installed so that supply ductscarry air circulated by the furnace to areasoutside the space containing the furnace, thereturn air shall also be handled by duct(s)sealed to the furnace casing and terminatingoutside the space containing the furnace.
8. A gas-fired furnace for installation in aresidential garage must be installed asspecified on Page 10 of these instructions.
9. The furnace is not to be used for temporaryheating of buildings or structures under con-struction.
INSTALLATION REQUIREMENTS
Requirements and CodesThis furnace must be installed in accordancewith these instructions, all applicable local build-ing codes, current revision of the National FuelGas Code (ANSI-Z223.1), and in Canada withthe CAN/CGA - B149 installation code. Thecurrent revision of the National Fuel Gas Codeis available from:American National Standards Institute, Inc.
1430 BroadwayNew York, New York 10018
Additional helpful publications are:NFPA-90A - Installation of
Air Conditioning and Ventilating Systems
NFPA-90B - Warm Air Heatingand Air Conditioning Systems
These publications are available from:National Fire Protection Association, Inc.Batterymarch ParkQuincy, Massachusetts 02269
! WARNING:This furnace is not approved for installa-tion in mobile homes. Installation in amobile home could cause fire, propertydamage, and/or personal injury.
LocationUpflow gas furnaces are shipped ready forinstallation in the upflow or horizontal right or leftpositions. The *RK gas furnace is for downflowoperation only. The furnace must be installed ona level surface, located as close to the vent (orchimney) and as close to the center of the airdistribution system as possible. See Table 1 foroverall dimensions to determine the requiredclearances in hallways, doorways, stairs, etc.to allow the furnace to be moved to the instal-lation point. The furnace must be installed sothat all electrical components are protectedfrom water. The furnace must be installedupstream from a refrigeration system. Thisfurnace is not to be used for temporary heatingof buildings or structures under construction.
IMPORTANT NOTE
The Commonwealth of Massachusetts re-quires compliance with regulation 248 CMR4.00 and 5.00 for installation of through – the– wall vented gas appliances as follows:
(a) For direct-vent appliances, mechanical-vent heating appliances or domestic hotwater equipment, where the bottom of thevent terminal and the air intake is installedbelow four feet above grade the followingrequirements must be satisfied:
1. If there is not one already present, oneach floor level where there arebedroom(s), a carbon monoxide de-tector and alarm shall be placed in theliving area outside the bedroom(s).The carbon monoxide detector shallcomply with NFPA 720 (2005 Edition).
9Table 3. Minimum Clearances to Combustible Material
LEFTSIDE
BOTTOM
TOP
RIGHTSIDE
DOWNFLOW APPLICATION
Downflow Furnace Models
* For Downflow furnace installations only, right side minimum clearance is 0".
** For Downflow furnace installations only, furnace must be installed on non-combustibleflooring.
*** Allow 24" minimum clearance for servicing. The recommended clearance is 36".
2. A carbon monoxide detector shall belocated in the room that houses theappliance or equipment and shall:
a. Be powered by the same electricalcircuit as the appliance or equip-ment such that only one serviceswitch services both the applianceand the carbon monoxide detector;
b. Have battery back-up power;c. Meet ANSI/UL 2034 Standards and
comply with NFPA 720 (2005 Edi-tion); and
d. Have been approved and listed by aNationally Recognized Testing Labo-ratory as recognized under 527CMR.
3. A Product-approved vent terminal mustbe used, and if applicable, a Product-approved air intake must be used.Installation shall be in strict compliancewith the manufacturer’s instructions. Acopy of the installation instructions shallremain with the appliance or equipmentat the completion of the installation.
4. A metal or plastic identification plateshall be mounted at the exterior of thebuilding, four feet directly above thelocation of vent terminal. The plate shallbe of sufficient size to be easily readfrom a distance of eight feet away, andread “Gas Vent Directly Below”.
LEFTSIDE
RIGHTSIDE
Upflow Furnace Models
BOTTOM
UPFLOW APPLICATION
TOP SIDE
BOTTOM
HORIZONTAL APPLICATION
SIDE
TOP
Vent ConnectorType
LEFT SIDE 0" 0"
RIGHT SIDE 5"* 0"
VENT 6" 1"
BACK 0" 0"
BOTTOM 0"** 0"**
TOP 1" 1"
FRONT 4"*** 4"***
Standard SingleWall Metal Vent
Type B-1 DoubleWall Metal Vent
UPFLOW, DOWNFLOW & HORIZONTALINSTALLATION CLEARANCES
10
(b) For direct-vent appliances, mechanical-vent heating appliances or domestic hotwater equipment where the bottom of thevent terminal and the air intake is installedabove four feet above grade the followingrequirements must be satisfied:
1. If there is not one already present, oneach floor level where there arebedroom(s), a carbon monoxide de-tector and alarm shall be placed in theliving area outside the bedroom(s).The carbon monoxide detector shallcomply with NFPA 720 (2005 Edition).
2. A carbon monoxide detector shall:
a. Be located in the room that housesthe appliance or equipment;
b. Be either hard-wired or battery pow-ered or both; and
c. Shall comply with NFPA 720 (2005Edition).
3. A Product-approved vent terminal mustbe used, and if applicable, a Product-approved air intake must be used.Installation shall be in strict compliancewith the manufacturer’s instructions. Acopy of the installation instructions shallremain with the appliance or equipmentat the completion of the installation.
Clearances to CombustiblesThis furnace is Design Certified by CSA Inter-national for the minimum clearances to com-bustible material listed in Table 3. Refer to thefurnace rating plate, located inside of the fur-nace cabinet, for the specific model number andclearance information.
Access for positioning and servicing the unitmust be considered when locating unit. Twentyfour inches is the minimum required clearancefrom the front of the unit for servicing it. Thirtyinches is the minimum required clearance fromthe front of the unit for positioning it. Thirty sixinches is the recommended clearance fromthe front of the unit. Please note that a panelor door can be located such that the minimumclearance on the rating plate is satisfied, but thatpanel or door must be removable and allow theappropriate clearance for your installation.
This furnace is certified for use on wood floor-ing. This furnace must not be installed directlyon carpeting, tile, or any combustible materialother than wood flooring.
Downflow Warning (*RK Models):The design of the downflow furnace is certifiedfor natural or propane gas and for installation onnon-combustible flooring. A special combus-tible floor sub-base is required when installingon a combustible floor. Failure to install the sub-base may result in fire, property damage andpersonal injury. The special downflow sub-bases are factory supplied accessories, partnumbers 902974, 902677, 904108 and 904165.Part #904165 is an adjustable sub-base kit andit can be used on all cabinet sizes. When thefurnace is installed on a factory or site-builtcased air conditioning coil, the sub-base is notnecessary. However, the plenum attached tothe coil casing must be installed such that itssurfaces are at least 1" from combustible con-struction.
! CAUTION:The downflow sub-base must not beinstalled directly on carpeting, tile, or anycombustible material other than woodflooring.
A gas-fired furnace installed in a residentialgarage must be installed so the burners and theigniter are located not less than 18 inches (457mm) above the floor, and the furnace must belocated or protected to avoid physical damageby vehicles.
! WARNING:Do not place combustible material on oragainst the furnace cabinet or within 6inches of the vent pipe. Do not placecombustible materials, including gaso-line and any other flammable vapors andliquids, in the vicinity of the furnace.
11
Supply Air Plenum Installation
A. Installation on a concrete slab. - *RK1. Construct a hole in the floor per the dimen-
sions in Figure 2.2. Place the plenum and the furnace as shown
in Figure 3.
B. Installation on a combustible floor. - *RK1. Cut and frame the hole in the floor per the
dimensions in Figure 4.2. Place sub-base for combustible floors over
the hole with its duct collar extended down-
ward. Attach the supply air plenum to the basein a manner which will assure 1" clearance tothe flooring or other combustible construc-tion. Place furnace on the combustible baseas shown in Figure 6.
3. When a factory or site built cased coil isprovided beneath the furnace the sub-basefor combustible floors is not necessary.However, the plenum attached to the casedcoil must be installed such that its surfacesare at least 1" from the flooring or othercombustible construction.
Hole in Floor
19.25"
18.75"
Hole in Floor
19.25"
13.25"
*RK 072-16; 096-12;096-16; 120-20;
135-20
*RK 060-12;072-08;072-12
Figure 2. Opening for Concrete Slab
Concrete Floor
Furnace
Sheet Metal
Plenum
Figure 3. Furnace on a Concrete Slab
19.63"
18.75"
19.63"
13.25"
Hole inFloor
Hole inFloor
*RK 072-16;096-12; 096-16;120-20; 135-20
*RK 060-12;072-08;072-12
Figure 4. Opening in Wood Floor
1 in
ch t
hic
k fi
ber
gla
ss 3
lb d
ensi
ty
28.38"
9.25"
19.63"
3"19.75"or 14.25"*
2.0"
1.58"
1.50"
16.75"
or 11.25"*
18.75"or 13.25"*
Figure 5. Downflow Sub-BaseDimensions
* Smaller dimensionsfor *RK060-12; 072-08; 072-12
Downflow WoodSub-base FloorFurnace
Sheet Metal
Plenum
Figure 6. Downflow Sub-BaseDimensions
12
VENTING AND COMBUSTIONAIR REQUIREMENTSGeneralProvisions must be made in the installation ofthis furnace to provide an adequate supply of airfor combustion. Detailed instructions for deter-mining the adequacy of an installation can befound in the current revision of the National FuelGas Code (ANSI Z223.1 / NFPA54) or in appli-cable local building codes. Consult localcodes for special requirements. For Cana-dian installations consult Canadian InstallationsCodes and (CAN/CGA B149.1 or .2).
If the furnace is operated with inadequate air forcombustion one of the flame roll-out switcheslocated in the burner compartment or the ventswitch will open, turning off the gas supply to theburners. These safety devices are manuallyreset switches. DO NOT install jumper wiresacross these switches to defeat their function.DO NOT reset a switch without identifying andcorrecting the fault condition. If a switch must bereplaced, use only the correct part specified inthe Replacement Parts List.
Air openings in the furnace door, warm airregisters, and return air grilles must not berestricted.
Combustion Air QualityTo maximize heat exchanger life, the combus-tion air must be free of chemicals which formcorrosive acidic compounds in the combustiongases. The recommended source of combus-tion air is to use the outdoor air supply. How-ever, the use of indoor air in most applicationsis acceptable except as follows:1. If the furnace is installed in a confined space it
is recommended that the necessary combus-tion air come from the outdoors by way of attic,crawl space, air duct, or direct opening.
2. If outdoor combustion air is used, there must beno exposure to the installations or substanceslisted in Item 3 below.
3. The following types of installation may requireOutdoor Air for combustion, due to chemicalexposures:• Commercial buildings• Buildings with indoor pools• Furnaces installed in laundry rooms• Furnaces installed in hobby or craft rooms• Furnaces installed near chemical storage
areas
Exposure to the following substances in thecombustion air supply may also require Out-door Air for combustion:• Permanent wave solutions• Chlorinated waxes and cleaners• Chlorine based swimming pool chemicals• Water softening chemicals• De-icing salts or chemicals• Carbon tetrachloride• Halogen type refrigerants• Cleaning solvents (such as perchloroethyl-
ene)• Printing inks, paint removers, varnishes,
etc.• Hydrochloric acid• Cements and glues• Antistatic fabric softeners for clothes dryers• Masonry acid washing materials
! CAUTION:Combustion air must not be drawn froma corrosive atmosphere.
! WARNING:Furnace installation using methods otherthan those described in the followingsections must comply with the NationalFuel Gas Code and all applicable localcodes to provide sufficient combustionair for the furnace.
Installation In An Unconfined SpaceAn unconfined space is an area including allrooms not separated by doors with a volumegreater than 50 cubic feet per 1,000 Btuh of thecombined input rates of all appliances whichdraw combustion air from that space. Forexample, a space including a water heater ratedat 45,000 Btuh input and a furnace rated at75,000 Btuh requires a volume of 6,000 cubicfeet [50 x (45 + 75) = 6,000] to be consideredunconfined. If the space has an 8 foot ceiling,the floor area of the space must be 750 squarefeet (6,000 / 8 = 750). In general, a furnaceinstalled in an unconfined space will not requireoutside air for combustion. However, in “tight”buildings (with weather stripping and caulk toreduce infiltration), it may be necessary toprovide outside air to ensure adequate com-bustion and venting, even though the furnace islocated in an unconfined space.
13
Installation In A Confined SpaceA confined space is an area with volume lessthan 50 cubic feet per 1,000 Btuh of the com-bined input rates of all appliances drawing com-bustion air from that space. Furnace closets,small equipment rooms and garages are con-fined spaces. Furnaces installed in a confinedspace which supply heated air to areas outsidethe space must draw return air from outside thespace and must have the return air ducts tightlysealed to the furnace. A confined space musthave two openings into the space for com-bustion air. One opening must be within 12inches of the ceiling, and the other must bewithin 12 inches of the floor. The requiredsizing of these openings is determined bywhether inside or outside air is used to supportcombustion, the method by which the air isbrought to the space, and by the total input rateof all appliances in the space.
Horizontal Furnace InstallationThe *RA series furnaces can be installed hori-zontally in an attic, basement, crawl space oralcove. It can be suspended from a ceiling in abasement or utility room in either a right to leftairflow or left to right airflow. (See Figures 7 and8.)
If the furnace is to be suspended from the ceiling,it will be necessary to use steel straps aroundeach end of the furnace. These straps shouldbe attached to the furnace with sheet metalscrews and to the rafters with bolts. The furnacecould also be suspended by an angle iron framebolted to the rafters. (See Figure 7.)
Access for positioning and servicing must beconsidered when locating the unit. Refer toTable 3, Minimum Clearances to CombustibleMaterial, for clearance specifications.
Keep all insulating materials away from thelouvered door. Insulating materials may be com-bustible.
The *RA series furnace may be installed directlyon combustible wood flooring or supports, if type"B-1" vent pipe is used (See Figure 8). It isrecommended for further reduction of fire haz-ard that cement board or sheet metal be placedbetween the furnace and the combustible floorand extend 12 inches beyond the front of thelouvered door.
! WARNING:Furnaces installed with combustion airdrawn from a heated space which in-cludes exhaust fans, fireplaces, or otherdevices that may produce a negativepressure should be considered con-fined space installations.
See the venting section for venting guidelinesand specifications.
Figure 7. *RA Horizontal InstallationSuspended in Attic or Crawl Space
Figure 8. *RA Horizontal installation on aPlatform
Gas Inlet
Electrical Supply
Connection
Coil Plenum
Type “B” Vent
CombustiblePlatform
Louver Door
Note: Line Contact is Permissible
14
Air From Inside (See Figure 9) If combustion air is taken from the heatedspace, the two openings must each have a freearea of at least one square inch per 1,000 Btuhof total input of all appliances in the confinedspace, but not less than 100 square inchesof free area. For example, if the combined inputrate of all appliances is less than or equal to100,000 Btuh, each opening must have a freearea of at least 100 square inches. If thecombined input rate of all appliances is 120,000Btuh, each opening must have a free area of atleast 120 square inches.
Total InputRating (Btu/hr)
40,000 60,000 80,000100,000120,000140,000160,000
MinimumFree Area
(Each Opening)
10 sq. in.15 sq. in.20 sq. in.25 sq. in.30 sq. in.35 sq. in.40 sq. in.
Round DuctDiameter
4"5"5"6"6"7"8"
Inlet Air Duct mustbe at least 1 sq. in.
per 4,000 Btuh oftotal input rating.
Inlet and Outlet Ducts must
extend aboveattic insulation.
Outlet Air Duct mustbe at least 1 sq. in.
per 4,000 Btuh oftotal input rating.
Ventilation Louvers ateach end of attic
AtticInsulation
12" Max
a. All Combustion Air from Ventilated Attic.
Furnace
Water Heater
Vent orChimney
Figure 11. Equipment in a ConfinedSpace with all Combustion Air Drawn
from the Outsidethrough Exterior Wall
Each openingto outsidemust be at least1 sq. in. per 4000 Btuh of total inputrating.
12" Max
12" Max
Total InputRating (Btuh)
40,000 60,000 80,000100,000120,000140,000160,000
MinimumFree Area
(Each Opening)
10 sq. in.15 sq. in.20 sq. in.25 sq. in.30 sq. in.35 sq. in.40 sq. in.
Round DuctDiameter
4" 5" 5" 6" 6" 7" 8"
---------
---------
Furnace
Water Heater
Vent orChimney
Figure 10. Equipment in a ConfinedSpace with all Combustion Air Drawn
from the Outsidethrough Vertical Ducts
Total InputRating (Btu/hr)
40,000 60,000 80,000100,000120,000140,000160,000
Round DuctDiameter
12"12"12"12"13"14"15"
MinimumFree Area
(Each Opening)100 sq. in.100 sq. in.100 sq. in.100 sq. in.120 sq. in.140 sq. in.160 sq. in.
Furnace
Openings toadjacent space.Each opening mustbe at least 100 sq. in.or 1 sq. in. per 1000Btuh of total inputrating, whichever isgreater. See minimumarea per table.
12" Max.
12" Max.
Water Heater
Vent orChimney
Figure 9. Equipment in a Confined Spacewith all Combustion AirDrawn from the Inside
Outdoor Air Using Vertical Ducts(See Figure 10)If combustion air is taken from outdoors throughvertical ducts, the openings and ducts musthave a minimum free area of one square inchper 4,000 Btuh of total appliance input. In instal-lations drawing combustion air from a ventilatedattic, both air ducts must extend above the atticinsulation.
If the unit is installed in an area with an exhaustfan, provide sufficient ventilation to preventnegative pressures from occurring in the room.
The combustion air openings must not be re-stricted in any manner.
! CAUTION:Do not supply combustion air from anattic space that is equipped with powerventilation or any other device that mayproduce a negative pressure.
Air Directly Through An Exterior Wall(See Figure 11)
If combustion air is provided directly through anexterior wall, the two openings must each have
15
free area of at least one square inch per 4000Btuh of total appliance input.
Outdoor Air Using a Crawl Space and VentilatedAttic (See Figure 12)When directly communicating with the out-doors, each opening shall have a minimum freearea of 1 square inch per 4,000 Btuh of totalappliance input. The openings shall communi-cate directly, or by ducts, with the outdoorspaces (crawl or attic) that freely communicatewith the outdoors.
Outdoor Air Using Horizontal Ducts (See Fig-ure 13)If combustion air is taken from outdoors throughhorizontal ducts, the openings and ducts musthave a minimum free area of one square inchper 2,000 Btuh of total appliance input.
If the unit is installed in an area with an exhaustfan, provide sufficient ventilation to preventnegative pressures from occurring in the room.
The combustion air openings must not be re-stricted in any manner.
VENTING REQUIREMENTS
GeneralThis furnace must be vented in compliancewith, the current revision of the National FuelGas Code (ANSI-Z223.1/NFPA54), with theinstructions provided below.
In Canada, venting shall conform to the require-ments of the current (CAN/CGA B149.1 or .2)installation codes. Consult local codes forspecial requirements.
For Category I furnace installations, the fur-nace shall be connected to a factory builtchimney or vent complying with a recognizedstandard, or a masonry or concrete chimneylined with a lining material acceptance to theauthority having jurisdiction. Venting into anunlined masonry chimney or concrete chim-ney is prohibited.
This furnace must never be vented to a chim-ney flue servicing a fireplace or other appliancedesigned to burn solid fuel. If the furnace ventis to be connected to a chimney serving afireplace, the fireplace must be sealed off fromthe chimney. Single wall metal vents shall not beused for Category I venting, Category I fur-naces must be vented vertically or near verti-cally.
The furnace vent, if metal, may be insulated iflocal codes allow. Any part of the vent system,metal vent only, not exposed to weather, butwhich are exposed to ambient temperaturesbelow 35° F must be insulated to prevent con-densation. All vent insulation shall be foil backedfiberglass of one inch minimum thickness.
Three sheet metal fasteners (field supplied)should be used to secure the vent pipe to thefurnace flue. These fasteners should be evenlyspaced around the flue diameter, if possible.
Figure 12. Equipment in a ConfinedSpace with All Combustion Air Drawn
from a Crawl Space and Ventilated Attic
Outlet Air Ductmust be at least1 sq. in. per 4000 Btuh of total inputrating. Must extend above attic insulation.
Ventilation Louvers ateach end of attic
Attic Insulation
Ventilation Louvers forunheated crawl space Crawl Space
Inlet Air Duct mustbe at least 1 sq. in.per 4,000 Btuh oftotal input rating.
Furnace
Water Heater
Vent orChimney
Figure 13. Equipment in a ConfinedSpace with all
Combustion Air Drawn from the Outsidethrough Horizontal Ducts
Total InputRating (Btu/hr)
40,000 60,000 80,000100,000120,000140,000160,000
MinimumFree Area
(Each Opening)
10 sq. in.15 sq. in.20 sq. in.25 sq. in.30 sq. in.35 sq. in.40 sq. in.
Round DuctDiameter
4"5"5"6"6"7"8"
Inlet Air Duct mustbe at least 1 sq. in.
per 4,000 Btuh oftotal input rating.
Inlet and Outlet Ducts must
extend aboveattic insulation.
Outlet Air Duct mustbe at least 1 sq. in.
per 4,000 Btuh oftotal input rating.
Ventilation Louvers ateach end of attic
AtticInsulation
12" Max
a. All Combustion Air from Ventilated Attic.
Furnace
Water Heater
Vent orChimney
16
Category I - Common VentingWhen an existing furnace is removed from aventing system serving other appliances, theventing system is likely to be too large toproperly vent the remaining appliances. Animproperly sized venting system can result inthe formation of condensate, leakage, spillage,etc.
The steps outlined in the warning below shall befollowed with each individual appliance con-nected to the vent system placed in operation,while all other appliances connected to the ventsystem are not in operation:
! WARNING:CARBON MONOXIDE POISONING HAZARD
Failure to follow the steps outlined below for each appliance connected to theventing system being placed into operation could result in carbon monoxidepoisoning or death.The following steps shall be followed for each appliance connected to the ventingsystem being placed into operation, while all other appliances connected to theventing system are not in operation:
1. Seal any unused openings in the venting system.2. Inspect the venting system for proper size and horizontal pitch, as required
in the National Fuel Gas Code, ANSI Z223. 1/NFPA 54 or the CSA B149.1,Natural Gas and Propane Installation Codes and these instructions. Deter-mine that there is no blockage or restriction, leakage, corrosion and otherdeficiencies which could cause an unsafe condition.
3. As far as practical, close all building doors and windows and all doorsbetween the space in which the appliance(s) connected to the ventingsystem are located and other spaces of the building.
4. Close fireplace dampers.5. Turn on clothes dryers and any appliance not connected to the venting
system. Turn on any exhaust fans, such as range hoods and bathroomexhausts, so they are operating at maximum speed. Do not operate asummer exhaust fan.
6. Follow the lighting instructions. Place the appliance being inspected intooperation. Adjust the thermostat so appliance is operating continuously.
7. Test for spillage from draft hood equipped appliances at the draft hoodrelief opening after 5 minutes of main burner operation. Use the flame of amatch or candle.
8. If improper venting is observed during any of the above tests, the ventingsystem must be corrected in accordance with the National Fuel Gas Code,ANSI Z223.1/NFPA 54 and/or CSA B149.1, Natural Gas and Propane Instal-lation Codes.
9. After it has been determined that each appliance connected to the ventingsystem properly vents when tested as outlined above, return doors, win-dows, exhaust fans, fireplace dampers and any other gas-fired burningappliance to their previous conditions of use.
17
The venting system should be designed to havethe minimum number of elbows or turns. Allhorizontal runs shall be sloped upwards fromthe furnace at 1/4 inch per running foot of vent.Supports for the vent pipe must be installed aminimum of every five feet along the vent run toensure no displacement after installation.
Under no circumstances shall any portion of thevent system extend into or pass through anyreturn air duct, supply air duct, or plenum.
If the furnace is operated with blocked or re-stricted venting, the blocked vent switch lo-cated in the vent plate will open, turning off thegas supply to the burners. The blocked ventswitch is a manually reset device. DO NOTinstall a jumper wire across this switch to defeatits function. DO NOT reset the switch withoutidentifying and correcting the fault conditionwhich caused the switch to trip. If this switchmust be replaced, use only the part specified inthe Replacement Parts List.
! WARNING:Upon completion of the furnace installa-tion, carefully inspect the entire flue sys-tem both inside and outside the furnaceto assure it is properly sealed. Leaks inthe flue system can result in seriouspersonal injury or death due to exposureof flue products, including carbon mon-oxide.
Figure 14. *RA Bleed Tube Installation
CollectorPan
PressureSwitch
SensorTubes
Bleed Tube
Bleed TubeOrifice - Pressswitch operatiat high altitudcan be made mresponsive bycovering bleedorifice
Category III: Horizontal Venting
NOTE: The reduced NOx models (eighthcharacter N) are not approved as a Cat-egory III (Category III) furnace for use withhorizontal venting.
The furnaces are approved for use with 3"single wall AL29-4C stainless steel ventpipe in horizontal vent applications. Thispipe is available from the following manufac-turers:
Z-FLEX Inc. - vent brand name (Z-VENT)Heat-fab Inc. - vent brand name (Saf-T Vent)Flex-L International - vent brand name (Star-
34 Vent)
This vent pipe must be used for the entire lengthof the vent run. The installation must be inaccordance with all instructions supplied by thevent manufacturer for use on Category IIIappliances. When venting horizontal, this isdefined as a Category III furnace, the ventpressure is positive, and the venting systemmust be sealed in both horizontal and verticalruns.
For horizontal venting installations in both theUnited States and Canada the transition as-sembly must be modified by adding a bleed tubeto the pressure switch tube and bypassing thevent switch. All model furnaces will require VentKit #903196 for horizontal venting.NOTE: No bleed tube is required for the *RA045(C,N)-08 model.
Horizontal Venting For Upflow Models:1. Remove the rubber tubing from the pressure
switch sensor tube and the collector pan sen-sor tube. Cut 1/2 inch from one end of the rubbersensor tube, fold in half and cut along the bendline. Discard the 1/2 inch long piece of tubing.Select the correct bleed tube using the tablesupplied with vent kit #903196 and place theother two pieces of tubing on both ends of thebleed tube. Do not cover the hole in the bleedtube. Place the assembly back on the pressureswitch sensor tube and the collector pan sen-sor tube. (See Figure 14.)
2. Remove the nut and restrictor plate from thevent collar assembly and discard the restrictorplate. Select the appropriate dilution cover plateas noted with vent kit #903196. Fit the clearancehole in the cover plate over the weld stud. Thecover plate must cover the hole(s) on the ventcollar assembly. Tighten the nut securely whileholding the cover plate in position. (See Figure15.)
Figure 15. Vent Collar Detail
CoverPlate
Nut
Covered Vent Collar Hole
18
3. Bypass the vent switch by removing both wiresfrom the vent switch and attaching them to thewire nut. (See Figure 16.)
Horizontal Venting: *RK Models:
1. By-pass the vent switch, located on blowercompartment door, by removing both wiresfrom the switch. Remove wire terminals, stripwires and tie together in a wire nut. (See Figure16.)
2. Remove the rubber tubing from the pressureswitch sensor tube and the collector pan sen-sor tube. Cut the tubing approximately 3" fromone end. Select the appropriate dilution coverplate as noted with vent kit #903196. Insert thebleed tube into the tubing. Do not cover thehole in the bleed tube. Place the tubingassembly back on the pressure switch sensortube and collector pan sensor tube. (See Figure17.)
3. To gain access to the restrictor plate, removeand discard the combustion tube from thetransition assembly. Insure the seal betweeninducer and transition assembly is notbroken. (See Figure 18.)
4. Remove and discard the restrictor plate andscrew from the transition assembly. (See Fig-ure 18.)
5. Install and seal a 4" to 3" reducer to thetransition. (See Figure 19.) Attach the new hightemperature vent pipe to the reducer.
Figure 16. Limit Circuit Wiring
Wire Nut
SwitchLimit
SwitchFlame
Roll-Out
SwitchVentLimit
Blue
Blu
e
Figure 17. *RK Bleed Tube Installation
Bleed Tube
Bleed TubeOrifice
CollectorPan
PressureSwitch
Figure 18. *RK HorizontalVent Modification
Transition
Inducer
Removeand
Discard
CombustionTube
Screw
RestrictorPlate
! CAUTION:Do not drill holes through the vent pipeor fittings on a horizontal vented fur-nace. Do not use sheet metal screws, orrivets. Drilling, screws, or rivets willcause leaks.
Figure 19. *RK Reducer Installation
Transition
4" to 3" Reducer
Special 3"AL29-4C Stainless
SteelVent Pipe
90˚ Elbow
3" Dia. Loop OutsideWall
Wall Thimble(For combustible
wall material)
TerminationTee
Support
Tee
0-6' DrainPlug 1/4" Per
Foot Rise
Locking Band LockingBand
Figure 20. Typical Horizontal VentInstallation
19
The components of the horizontal vent systemmust not be penetrated with screws, rivets, orother devices, either when joining pipes andfittings or using support straps. All joints mustbe sealed with high temperature silicone beforelocking bands are installed. If the lengths of pipemust be cut, the joint must still be sealed withsilicone and the locking band used. Wheninstalling the condensate tube be sure to forma trap by means of a 3" loop filled with water.(See Figure 20.)
Keep the number of pipe fittings to a minimum.Maintain a minimum of 6 inches of air spacebetween the vent and combustibles at all times,this includes inside and outside the building.
NOTE: The direction of the male-female jointsfrom the drain tee to the termination tee isopposite to standard gas appliance venting.The male end of the pipes point towards thefurnace.
1. Apply an adhesive bead around theoutside of the pipe approximately 1/4"from the end of the pipe. This includesthe first fitting or pipe attached to thefurnace.
2. Push the pipe and fitting together whiletwisting the pipe or fitting. Twisting thepipe or fitting spreads the adhesivecompletely within the fitting socket.
3. When the pipe is at the socket bottom,inspect the joint. Look for a complete,uninterrupted ring of adhesive materialaround the pipe at the fitting socket.Additional adhesive or rotation of thepipe or fitting may be required for acomplete seal. The complete adhesivematerial ring provides the seal requiredfor the positive pressure vent.
4. All vent systems must include a tee anddrain plug for collection and disposal ofcondensate. The drain tee must beinstalled within the first 5 feet of vent runto protect the furnace.
5. All horizontal sections must have aslope toward the drain tee of not lessthan 1/4" per foot to prevent the collectionof condensate at any location other thanat the tee.
6. Horizontal runs must be supported with3/4" pipe strap at a maximum of 5 footintervals and at each point where anelbow is used.
7. Maintain a 6 inch minimum air space tocombustibles from all sections of thestainless steel vent system, exceptwhen a wall thimble is used.
Horizontal Power Venting — The TjerlundGPAK-1T* horizontal kit is certified for use withthis furnace. The kit includes a power venter,a side-wall vent hood and a barometric draftcontrol. It has an electrical interlock to assurethat the furnace will not operate when the powerventer is off.
The kit is for use only when exhaust is throughan exterior wall, normally with horizontal ventpiping. The power venter establishes negativepressure in the vent piping and the furnaceoperates as if connected to Category I verticalventing.
Installation Instructions are provided with thekit. Installation must conform to those instruc-tions and applicable requirements of local codes.
! WARNING:The entire vent system must be sealedwith a high temperature sealant whichwill withstand temperatures of 450°F.Recommended sealants: Dow CorningSealant 736 RTV; GE 106 RTV; HighTech Ind., High TEMP RED.
Horizontal Venting RequirementsFurnace
Model Number Pipe Reducer Maximum Max. Feet*RA Size Needed # Elbows Vent Pipe
045C-08 3" None 4 35060C-12 3" 4" to 3" 4 35072C-12 3" 4" to 3" 4 35072C-16 3" 4" to 3" 4 35072C-17 3" 4" to 3" 4 35096C-12 3" 4" to 3" 4 35096C-16 3" 4" to 3" 4 35096C-20 3" 4" to 3" 4 35120C-16 3" 4" to 3" 4 35120C-20 3" 4" to 3" 4 35144C-20 3" 4" to 3" 3 30
Note: Special 5" to 4" Reducer Kit, p/n 902249 required for modelnumber *RA144C-20.
FurnaceModel Number Pipe Reducer Maximum Max. Feet
*RK Size Needed # Elbows Vent Pipe060C-12 3" 4" to 3" 4 35072C-12 3" 4" to 3" 4 35072C-16 3" 4" to 3" 4 35096C-12 3" 4" to 3" 4 35096C-16 3" 4" to 3" 4 35120C-20 3" 4" to 3" 4 35135C-20 3" 4" to 3" 4 30
Table 4. HorizontalVenting Requirements
NOTE: Reduced NOx furnaces are not ap-proved for horizontal vent.
20
VENT TERMINAL AIR SUPPLY INLET AREA WHERE TERMINAL IS NOT PERMITTED
1 In accordance with the current CSA B149.1 Natural Gas and Propane Installation Code2 In accordance with the current ANSI Z223.1 / NFPA 54 National Fuel Gas Code† A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family
dwellings and serves both dwellings.‡ Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.* For clearances not specified in ANSI Z223.1 / NFPA 54 or CSA B149.1, one of the following statement shall be included:
“Clearance in accordance with local installation codes, and the requirements of the gas supplier and themanufacturer’s installation instructions.”
Figure 21. Vent Termination Clearances for Direct Vent Furnaces
Canadian Installations1 US Installations2
A = Clearance above grade, veranda, porch, deck, or balcony
12 inches (30 cm) 12 inches (30 cm)
B = Clearance to window or door that may be opened
6 inches (15 cm) for appliances ≤ 10,000 Btuh (3 kW), 12 inches (30 cm) for appliances > 10,000 Btuh (3 kW) and ≤ 100,00 Btuh (30 kW), 36 inches (91 cm) for appliances >100,00 Btuh (30 kW)
4 feet (1.2 m) below or to side of opening; 1 foot (300 mm) above opening
C = Clearance to permanently closed window * *D = Vertical clearance to ventilated soffit
located above the terminal within a horizontal distance of 2 feet (61 cm) from the center line of the terminal
* *
E = Clearance to unventilated soffit * *F = Clearance to outside corner * *G = Clearance to inside corner * *H = Clearance to each side of center line
extended above meter/regulator assembly3 feet (91 cm) within a height 15 feet above the meter/regulator assembly
*
I = Clearance to service regulator vent outlet 3 feet (1.83 m) *J = Clearance to nonmechanical air supply inlet
to building or the combustion air inlet to any other appliance
6 inches (15 cm) for appliances ≤ 10,000 Btuh (3 kW), 12 inches (30 cm) for appliances > 10,000 Btuh (3 kW) and ≤ 100,00 Btuh (30 kW), 36 inches (91 cm) for appliances >100,00 Btuh (30 kW)
4 feet (1.2 m) below or to side of opening; 1 foot (300 mm) above opening
K = Clearance to a mechanical air supply inlet 6 feet (1.83 m) 3 feet (91 cm) above if within 10 feet (3 m) horizontally
L = Clearance above paved sidewalk or paved driveway located on public property
7 feet (2.13 m) † 7 feet (2.13 m)
M = Clearance under veranda, porch deck, or balcony
12 inches (30 cm) ‡*
21
Location of Outdoor Terminations
Horizontal InstallationThe vent termination tee must be installed withthe following minimum clearances. (See Figure21.) Vent termination clearances shall be con-sistent with the National Fuel Gas Code, ANSI2223.1/NFPA 54 and/or the CSA B149.1,Natural Gas and Propane Installation Code.
All minimum clearances specified must bemaintained to protect building materials fromdegradation by flue gases.
1. The termination tee must be 12 inchesabove snow level or grade level whichever is higher. See Figure 22 for alter-nate method to achieve 12" above snowlevel.
2. Avoid areas where condensate drainagemay cause problems such as aboveplanters, patios, or adjacent to windowswhere the steam from the flue gasesmay cause fogging. Do not terminateabove any public walkway.
3. Select the point of wall penetration wherethe minimum 1/4 inch per foot of upwardslope can be maintained.
4. When penetrating a noncombustiblewall, the hole through the wall must belarge enough to maintain the pitch, pipeclearance for passage, and provide forproper sealing. Penetrating a combus-tible wall requires the use of a wallthimble. (See Figure 22.) A 6-1/2 inchsquare framed opening is required toinsert the thimble halves. The thimble isadjustable to varying wall thickness andis held in place by applying sealant to themale sleeve before assembly. Also runa bead of sealant around the outer wallthimble.
5. The vent pipe must extend 1-1/4 inchesthrough the outer thimble half for acombustible wall. Be sure to check thiscarefully before cutting the vent pipe.
6. Attach a 3 inch coupling to the end of thepipe that extends through the wall orthimble. This prevents the vent pipefrom being pushed inward.
7. Cut an 8 inch minimum piece of vent pipeand connect the coupling to thetermination tee. The inside of the teemust be a minimum of 12 inches fromthe outside of the wall. (See Figure 23.)
Use Wall Thimble atVent Points
Support vent pipeevery 5 feet
Ground Level
Termination Tee
Figure 22. Alternate Horizontal VentInstallation
Wall Thimble(Inner Half)
Inner Shield41/2" Dia.
Wall Thimble Outer Half
Outer OverlappingShield 61/2" Dia.
3" TerminationTee
ProtectiveScreen
InsideCombustible
Wall
InsideCombustible
Wall
3" VentPipe
OutsideCombustibleWall
Inner OverlappingShield 63/8" Dia.
Locking Band
12" Min
Figure 23. Typical Termination
22
Flexible Vent SystemsFlexible gas vent is approved for use in verticalsingle vent or common vent installations only.The minimum distance to combustibles is 1" fortype B insulated and 6" for single wall. Theventing system must be installed in accordancewith the local authorities, the vent manufacturer'sinstructions and the instructions listed below.
The flexible vent must be installed in accor-dance with the venting tables for vertical orcommon venting only. The vent system mustbe supported in horizontal runs with3/4" pipe strap at a maximum of 5 foot intervals.All horizontal sections must have a slope to-ward the furnace of not less than 1/4" per foot.The vent must not sag, or have any bendsgreater than 90 degrees.
CIRCULATING AIR SUPPLY
GeneralPlenums and air ducts must be installed inaccordance with the Standard for the Installa-tion of Air Conditioning and Ventilating Systems(NFPA No. 90A) or the Standard for the Instal-lation of Warm Air Heating and Air ConditioningSystems (NFPA No. 90B).
It is recommended that the outlet duct be pro-vided with a removable access panel. Thisopening should be accessible when the furnaceis installed in service and shall be of a size thatsmoke or reflected light may be observed insidethe casing to indicate the presence of leaks inthe heat exchanger. The cover for the openingshall be attached in such a manner as to preventleaks.
If outside air is used as return air to the furnacefor ventilation or to improve indoor air quality, thesystem must be designed so that the return airis not less than 50° F (10° C) during operation.If a combination of indoor and outdoor air isused, the ducts and damper system must bedesigned so that the return air supply to thefurnace is equal to the return air supply undernormal, indoor return air applications.
When a cooling system is installed which usesthe furnace blower to provide airflow over theindoor coil, the coil must be installed down-stream (on the outlet side) of the furnace or inparallel with the furnace.
If a cooling system is installed in parallel with thefurnace, a damper must be installed to preventchilled air from entering the furnace and con-densing on the heat exchanger. If a manuallyoperated damper is installed, it must be de-signed so that operation of the furnace is pre-vented when the damper is in the cooling posi-tion and operation of the cooling system isprevented when the damper is in the heatingposition.
Return AirIn applications where the supply ducts carryheated air to areas outside the space in whichthe furnace is installed, the return air must bedelivered to the furnace by duct(s) sealed to thefurnace casing, running full size and withoutinterruption.
! WARNING:The solid base of the furnace must bein place when the furnace is installedwith side return air ducts. Removal ofall or part of the base could causeproducts of combustion to be circu-lated into the living space and createpotentially hazardous conditions, in-cluding carbon monoxide poisoningthat could result in personal injury ordeath.
For upflow/horizontal installations: The returnair ductwork may be connected to the left side,right side, or bottom. NOTE: Do not use theback of the furnace for return air. Table 2 and2a, in the front pages of these instructions,contains the airflow data for each furnace model.Where maximum airflow is 1800 CFM or more,two openings must be used for return air.
23
! WARNING:Products of combustion must not beallowed to enter the return air ductworkor the circulating air supply. Failure toprevent products of combustion frombeing circulated into the living space cancreate potentially hazardous conditionsincluding carbon monoxide poisoningthat could result in personal injury ordeath.
All return ductwork must be secured tothe furnace with sheet metal screws.For installations in confined spaces, allreturn ductwork must be adequatelysealed and joints must be taped. Whenreturn air is provided through the bottomof the furnace, the joint between thefurnace and the return air plenum mustbe air tight.
The floor or platform on which the fur-nace is mounted must provide soundphysical support of the furnace with nogaps, cracks, or sagging between thefurnace and the floor or platform.
Return air and circulating air ductworkmust not be connected to any other heatproducing device such as a fireplace in-sert, stove, etc. Doing so may result in fire,explosion, carbon monoxide poisoning,personal injury, or property damage.
GAS SUPPLY AND PIPING
GeneralThis furnace may be installed for either left orright side gas entry. A typical gas servicehookup is shown in Figure 24. When making thegas connection provide clearance between thegas supply line and the entry hole in the furnacecasing to avoid unwanted noise and/or damageto the furnace.
All gas piping must be installed in compliancewith local codes and utility regulations. Somelocal regulations require the installation of amanual main shut-off valve and ground jointunion external to the furnace. The shut-offvalve should be readily accessible for serviceand/or emergency use. Consult the local utilityor gas supplier for additional requirements re-garding placement of the manual main gas shut-off. In the absence of local codes the gas lineinstallation must comply with the latest edition ofthe National Fuel Gas Code (ANSI Z223.1) or(CAN/CGA B149.1 or .2) Installation Codes.
An 1/8 inch NPT tap must be installed in the gasline to the unit for use when measuring the gassupply pressure. The tap should be readilyaccessible for service use. A drip leg should beinstalled in the vertical pipe run to the unit. Table5 lists gas flow capacities for standard pipesizes as a function of length in typical applica-tions based on nominal pressure drop in the line.
IMPORTANT NOTES:1. Gas piping must not be run in or through air
ducts, chimneys, gas vents, elevator shafts,etc.
2. Compounds used on threaded joints of gaspiping must be resistant to the actions of lique-fied petroleum gases.
3. The main manual gas valve and main powerdisconnect to the furnace must be properlylabeled by the installer in case emergencyshutdown is required.
Leak CheckAfter the gas piping to the furnace is complete,all connections must be tested for gas leaks. Tocheck for leaks in gas piping systems, use onlya soap and water solution or other approvedmethod.
Ground JointUnion
Dripleg
Shut-Off Valve
BurnerAssembly
Manifold
Some utilitiesrequire Shut-Off
Valve to be4 to 5 feet
above floor
Automatic GasValve (with manual
shut-off)
Downflow Models- Right Side Entry
Upflow Models- Left Side Entry
Figure 24. Typical GasService Connection
Ground JointUnion
Dripleg
Shut-Off Valve
Manifold
Some utilitiesrequire Shut-Off
Valve to be4 to 5 feet
above floor
Automatic GasValve (with manual
shut-off)
BurnerAssembly
24
Table 5. Capacity of Black Iron Gas Pipe (cu. ft. per hour) for Natural Gas
(specific gravity = .60)
NOMINAL LENGTH OF PIPE RUNBLACK IRON (feet)
PIPE DIAMETER(in.) 10 20 30 40 50 60 70 80
1/2 130 90 75 65 55 50 45 40
3/4 280 190 150 130 115 105 95 90
1 520 350 285 245 215 195 180 170
1 1/4 1050 730 590 500 440 400 370 350
1 1/2 1600 1100 890 760 670 610 560 530
The cubic feet per hour listed in the table above must be greater than the cubic feet per hour of gas flow required by the furnace.
To determine the cubic feet per hour of gas flow required by the furnace, divide the input rate of the furnace by the heating value of the gas:
Cubic Feet Per Hour Required Input To Furnace (Btu/hr)Heating Value of Gas (Btu/Cu. Ft.)
CAPACITY OF BLACK IRON GAS PIPE (CU. FT. PER HOUR)FOR NATURAL GAS (SPECIFIC GRAVITY - 0.60)
! CAUTION:Do not use matches, lighters, candles,or other sources of open flame to checkfor gas leaks.
IMPORTANT NOTE:When pressure testing the gas supply linesat pressures greater than 1/2 psig (14 inchW.C.), the furnace must be disconnectedfrom the gas supply piping system to pre-vent damage to the gas control valve. If thetest pressure is less than or equal to 1/2 psig(14 inch W.C.), the furnace must beisolated from the gas supply line by closingthe manual shut-off valve.
! WARNING:FIRE OR EXPLOSION HAZARD
Failure to follow the safety warnings ex-actly could result in serious injury, deathor property damage.Never test for gas leaks with an openflame. Use a commercially available soapsolution made specifically for the detec-tion of leaks to check all connections. Afire or explosion may result causing prop-erty damage, personal injury or loss oflife.
ConversionConversion of this furnace to use LP/propanegas must be made by qualified service person-nel, using only approved parts.
! WARNING:This furnace was equipped at the factoryfor use with natural gas only. A specialkit, supplied by the manufacturer, is re-quired to convert the furnace to operateon LP/propane gas. Failure to use theproper conversion kit can cause fire, ex-plosion, property damage, carbon mon-oxide poisoning, personal injury, ordeath.
High Altitude ApplicationHigh altitude application with this furnace can befield performed by a simple adjustment of mani-fold pressure, and if necessary changing theorifices. The changes required depend on theinstallation altitude and the heating value of thegas. The gas heating value based on sea levelcan be obtained from your local gas utility. Theheating value of gas at high altitude is alwayslower than the sea level heating value. Theheating values used in Tables 6 & 7 are basedon sea level values.
Natural Gas High Altitude ConversionAll factory shipped furnaces are ready to oper-ate between zero and 4999 ft. above sea level.For higher altitudes (between 5000 and 10,000ft. above sea level), conversion can be achievedsimply by adjusting the furnace manifold pres-sure as shown in Table 6.
LP/Propane Gas Sea Level and High Alti-tude Conversion
IMPORTANT NOTE: When converting a lowNOx furnace from Natural gas to LP/pro-pane gas, it is necessary to remove the NOxBaffles from the furnace.
Conversion of this furnace to utilize LP/propanegas must be made by qualified service person-nel, using factory authorized or approved parts.Conversion to LP/propane gas can be accom-plished by first replacing the natural gas orificeswith the appropriate LP/propane orifices shownin Table 8 or 9. Note: for installations betweenzero and 5000 ft. above sea level, a, #53, #54
25
Table 6. Manifold Pressure (in WC) for Natural Gas at Various Altitudes
Table 7. Manifold Pressure (in WC) for LP/Propane Gas at Various Altitudes
Elevation (feet above sea level)0 to 2,000 to 5,000 to 6,000 to 8,000 to
1,999 4,999 5,999 7,999 10,000
10.0 8.5 10.0 9.0 8.5Manifold Pressure in (WC)for an LP Gas HeatingValue of 2,500 Btu/hr.
Table 8. Natural and LP Gas Orifice Sizes for Elevations between zero and 4999 ft.Above Sea Level
Table 9. Natural and LP gas Orifice Sizes for Elevations between 5000 and 10,000 ft.Above Sea Level
For a Natural Gas Sea Level Heating Value of 800 to 899 Btu/cu.ft.Elevation (feet above sea level)
zero to 1999
2000 to 4999
5000 to 5999
6000 to 7999
8000 to 10000
Manifold Pressure Setting (in WC) 3.5 3.5 3.5 3.5 3.0
For a Natural Gas Sea Level Heating Value of 900 to 999 Btu/cu.ft.Elevation (feet above sea level)
zero to 1999
2000 to 4999
5000 to 5999
6000 to 7999
8000 to 10000
Manifold Pressure Setting (in WC) 3.5 3.5 3.5 3.2 2.8
For a Natural Gas Sea Level Heating Value of 1,000 to 1,100 Btu/cu.ft.Elevation (feet above sea level)
zero to 1999
2000 to 4999
5000 to 5999
6000 to 7999
8000 to 10000
Manifold Pressure Setting (in WC) 3.5 3.5 3.0 2.8 2.5
Furnace RatingPlate Input (Btu/h) Nat LP
45000 44 5560000 45 5672000 43 5596000 43 55120000 43 55135000 41 55144000 43 55
Orifice Drill Size
Furnace RatingPlate Input (Btu/h) Nat LP
45000 44 5460000 45 5572000 43 5496000 43 54120000 43 54135000 41 54144000 43 54
Orifice Drill Size
or #55 drill size orifice should be used depend-ing upon the rated firing rate of the unit (seeTable 8 or 9). However for installations above5000 ft. above sea level, a # 55 or #56 drill sizeorifice should be used. After changing theorifices, use Table 7 to determine the appropri-ate manifold pressure for your installation.
Conversion to LP/propane, sea level, and highaltitude is detailed in the installation instructions
provided with the conversion kit. Approvedconversion kits are listed below.
United States LP/Propane Gas Sea Level andHigh Altitude Conversion Kit - P/N 904090AThis kit is for LP/propane conversion in theUnited States at altitudes between zero and10,000 ft. above sea level. Follow the installa-tion instructions supplied with the kit for properinstallation.
26
Canadian LP/Propane Gas Sea Level and HighAltitude Conversion Kit - P/N 904091AThis kit is for LP/propane conversions in Canadaat altitudes between zero and 4500 ft. abovesea level. Follow the installation instructionssupplied with the kit for proper installation.
! WARNING:To avoid electric shock, personal injury,or death, turn off the electric power at thedisconnect or the main service panelbefore making any electrical connections.
ELECTRICAL WIRING
GeneralElectrical connections must be made in accor-dance with all applicable local codes and ordi-nances, and with the current revision of theNational Electric Code (ANSI/NFPA 70).
For Canadian installations the electrical con-nections and grounding shall be done in accor-dance with the current Canadian Electrical
Table 10. Electrical Data
Thermostat Wire Gauge Recommended Thermostat Wire Length2-wire 4 or 5-wire
(heating) (cooling)
24 55 ft. 25 ft.22 90 ft. 45 ft.20 140 ft. 70 ft.18 225 ft. 110 ft.
Note: (†) can be C or N.**Time-delay fuses or HACR-type circuit breakers are required.
Furnace Furnace Cabinet Nominal Maximum Minimum Maximum Minimum MaximumModel Number Input Width Electrical Operating Operating Furnace Wire Fuse or Circuit
*RA,*RK (Btu/hr) (in.) Supply Voltage Voltage Amperes Gauge Breaker Amps**
045(†)-08 45,000 14.25 115-60-1 127 103 5.6 14 15060(†)-12 60,000 14.25 115-60-1 127 103 7.1 14 15072(†)-12 72,000 14.25 115-60-1 127 103 7.1 14 15072(†)-16 72,000 19.75 115-60-1 127 103 9.0 14 15072(†)-17 72,000 14.25 115-60-1 127 103 21.0 10 35096(†)-12 96,000 19.75 115-60-1 127 103 7.1 14 15096(†)-16 96,000 19.75 115-60-1 127 103 9.0 14 15096(†)-20 96,000 22.50 115-60-1 127 103 12.2 12 20120(†)-16 120,000 19.75 115-60-1 127 103 9.0 14 15120(†)-20 120,000 22.50 115-60-1 127 103 12.2 12 20135(†)-20 135,000 22.50 115-60-1 127 103 12.2 12 20144(†)-20 144,000 22.50 115-60-1 127 103 12.2 12 20
Code (CSA C22.1, Part 1 and/or local codes).If any of the original wire as supplied with thefurnace must be replaced, it must be replacedwith wire having a temperature rating of at least105°C. Refer to the furnace nameplate andTable 10 for electrical requirements.
Line Voltage WiringThe line voltage (115 volt) to the furnace mustbe supplied from a dedicated branch circuitcontaining the correct fuse or circuit breaker forthe furnace. (See Table 10.) An electricaldisconnect must be installed to be readily ac-cessible from and located within sight of thefurnace. (See the Wiring Diagram label in thefurnace and Figure 25.)
! CAUTION:Label all wires prior to disconnectionwhen servicing controls. Wiring errorscan cause improper and dangerous op-eration.
Verify proper operation after servicing.
27
R C
Y G
W
A/C Condensing Unit
Condensing UnitControl Box
RoomThermostat
Flame Signal Light(Yellow)
Status Light(Red)
60 90 120
180Blower Off
Timing
TWIN
3 AmpFuse
COM
24 V
HU
M
Neutrals
Low VoltageConnections
4 15 26 3
7
8
9
4
5
6
1
2
3
EA
C
HU
M M1
M2
M3
HE
AT
L1
XF
MR
Unused Motor Leads
EA
C
R Y
G W
Connect R & W
ForHeating
Only
FIELD WIRING
NOTE: The "Y" terminal on the UTEC control board must be connected to the thermostatfor proper coolingmode operation.
CO
OL
Figure 26. Low Voltage Field, Four-wire Heating/Cooling Applications
Figure 25. Line Voltage Field Wiring
Field Supplied Disconnect Within Sight of Furnace
Field SuppliedPanel Connector
Field SuppliedFused Service
Panel
Black (Hot)White (Neutral)Green or Bare
(Ground)
BlackWhite
BlackWhite
BlackWhite
Field Line VoltageWiring
Factory LineVoltage Wiring
Ground Ground Ground
Junction Box (may be internalor external to the furnace). Theseconnections can be made in thefield supplied disconnect at thefurnace.
The furnace cabinet must have an uninter-rupted, unbroken ground to minimize injuryshould an electrical fault condition occur. Thecontrols used in this furnace require anearth ground to operate properly. Accept-able methods for grounding are electrical wireor conduit approved for electrical ground ser-vice. Do not use gas piping as an electricalground.
IMPORTANT NOTE:Proper line voltage polarity must be main-tained in order for the control system tooperate correctly. Verify that the incomingneutral line is connected to the white wireand the incoming “hot” line is connectedto the black wire. These furnaces will notoperate unless the polarity and ground areproperly connected. See Figure 25.
Low Voltage WiringInstall the thermostat per the manufacturer’sinstructions. The low voltage (24 volt) connec-tions from the thermostat are made at theterminal strip on the integrated control in the
furnace. See Figure 26 for the proper connec-tions for heating only (two-wire) and heating/cooling (four-wire) applications. The recom-mended minimum wire gauge for thermostatwiring is shown in Table 10.
The thermostat must not be installed on anoutside wall or any other location where itsoperation may be adversely affected. Adverseaffects include radiant loading from fireplaces,sunlight, or lighting fixtures, and convectiveloading from warm air registers or electricalappliances.
To determine the heat anticipator setting either:
1. Add the current draw of the system compo-nents; or
2. Measure the current flow on the thermostat R-W circuit after the circulating blower motor hasstarted.
Set the heat anticipator according to the ther-mostat manufacturer’s instructions for heatanticipator settings.
28
START-UP AND ADJUSTMENTSGeneralPrior to start-up, verify that:
1. The line voltage power leads are securelyconnected, that the polarity of the connectionsis correct, and that the furnace is properlygrounded.
2. The thermostat wires (R, W, Y, and G) aresecurely connected to the correct leads on theterminal strip of the circuit board.
3. The gas line service pressure does not exceed10.0 in. water column (0.36 psig), and is not lessthan 4.5 in. water column (0.16 psig) for naturalgas. For LP gas the line service pressure mustnot exceed 14 in. water column (0.51 psig), andmust not be less than 11.0 in. w.c. (0.40 psig).
4. The roll-out and vent safety manual resetswitches are closed. If necessary, press thered button to reset a switch. DO NOT install ajumper wire across a switch to defeat itsfunction. If a switch reopens on start-up, DONOT reset the switch without identifying andcorrecting the fault condition which caused theswitch to trip.
5. The blower door is in place, closing the doorswitch in the line voltage circuit.
6. The gas line has been purged and all connec-tions are leak tight.
Start-up ProceduresAfter all of the above checks have been made:
1. Set the thermostat to the lowest setting.2. Close the disconnect(s) to provide line voltage
to the furnace.3. Follow the procedures given on the operating
instruction label attached to the furnace.4. Set the thermostat above room temperature
and verify the operating sequence. (See theSequence of Operation).
5. After the furnace has run for approximately fiveminutes, set the thermostat below room tem-perature and verify steps (9) through (11) of theSequence of Operation.
Verifying and Adjusting Firing RateThe firing rate must be verified for each installation
to prevent over-firing the furnace.
IMPORTANT NOTE:The firing rate must not exceed the rateshown on the furnace rating plate. At alti-tudes above 2000 feet it must not exceedthat on the rating plate less 4% for each1000 feet.
Follow the procedure below to determine thefiring rate.
1. Shut off all other gas fired appliances.2. Start the furnace and allow it to run for at least
three minutes.3. Measure the time (in seconds) required for the
gas meter to complete one revolution.4. Convert the time per revolution to cubic feet of
gas per hour using Table 11.5. Multiply the gas flow rate in cubic feet per hour
by the heating value of the gas in Btu per cubicfoot to obtain the firing rate in Btu per hour.Example:
• Time for 1 revolution of a gas meter with a 1cubic foot dial = 40 seconds.
• From Table 11 read 90 cubic feet per hourof gas.
• Heating value of the gas (obtained from gassupplier) = 1040 Btu per cubic foot.
• Firing rate = 1040 x 90 = 93,600 Btuh.
6. Adjustments to the firing rate can be made byadjusting the gas manifold pressure. See theHigh Altitude Application section for additionalinformation of firing rate at elevations above2000 ft.
The manifold pressure must be set to theappropriate value for your installation. Refer toeither Table 6 for natural gas or Table 7 for LP/propane gas to verify the manifold pressuresetting required for your particular installation.To adjust the manifold pressure, remove theregulator cap and turn the adjusting screwclockwise to increase pressure or counter-clockwise to reduce pressure. Replace theregulator cap after adjustments are complete.
! CAUTION:Do not re-drill the burner orifices. If theorifice size must be changed, use onlynew orifices.
Verifying and Adjusting Temperature RiseVerify the temperature rise through the furnaceis within the range specified on the furnacerating plate. Temperature rises outside thespecified range could result in premature heatexchanger failure.
Place thermometers in the return and supply airstream as close to the furnace as possible. The
29
Table 11. Gas Flow Rate
TIME FOR TIME FORONE REVOLUTION ONE REVOLUTION
(SECONDS) 1 5 10 (SECONDS) 1 5 1010 360 1800 3600 66 55 273 54512 300 1500 3000 68 53 265 52914 257 1286 2571 70 51 257 51416 225 1125 2250 72 50 250 50018 200 1000 2000 74 49 243 48620 180 900 1800 76 47 237 47422 164 818 1636 78 46 231 46224 150 750 1500 80 45 225 45026 138 692 1385 82 44 220 43928 129 643 1286 84 43 214 42930 120 600 1200 86 42 209 41932 113 563 1125 88 41 205 40934 106 529 1059 90 40 200 40036 100 500 1000 92 39 196 39138 95 474 947 94 38 191 38340 90 450 900 96 38 188 37542 86 429 857 98 37 184 36744 82 409 818 100 36 180 36046 78 391 783 102 35 176 35348 75 375 750 104 35 173 34650 72 360 720 106 34 170 34052 69 346 692 108 33 167 33354 67 333 667 110 33 164 32756 64 321 643 112 32 161 32158 62 310 621 114 32 158 31660 60 300 600 116 31 155 31062 58 290 581 118 31 153 30564 56 281 563 120 30 150 300
GAS FLOW RATE (CUBIC FEET PER HOUR)
CUBIC FEET PER REVOLUTION OF METER
CUBIC FEET PER REVOLUTION OF METER
thermometer on the supply air side must beshielded from direct radiation from the heatexchanger to avoid false readings. Adjust allregisters and duct dampers to the desiredposition and run the furnace for ten to fifteenminutes before taking any temperature read-ings. The temperature rise is the differencebetween the supply and return air tempera-tures. For typical duct systems, the tempera-ture rise will fall within the range specified on therating plate with the blower speed at the factoryrecommended setting. If the temperature risemeasured is outside the range specified, it maybe necessary to change the blower speed.Lower blower speeds will increase the tem-perature rise and higher blower speeds willdecrease the temperature rise. The furnace isequipped with a multi-speed motor. Heating andcooling speed selection is made by moving theleads on the integrated control located in thefurnace. The wiring diagram on the furnace andFigure 28 show the speed taps for adjustingmotor speed.
If it is desired that the blower operate at the samespeed for heating and cooling, tape off the
unused blower lead and install the jumper wirefound in the plastic instruction bag. Remove thedesired blower tap, and install the jumper wirepiggyback to the heating speed tap, and straightquick connect to the cooling speed tap. Recon-nect the desired blower tap to piggyback quickconnect.
The integrated control is factory set to start thecirculating air blower 30 seconds after the gasvalve is opened. The integrated control isfactory wired to turn the blower motor off 120seconds after the gas valve is closed. Ifnecessary for comfort, the “off” time may bechanged by adjusting the Blower Off jumper onthe integrated control. See Figure 27 for bloweron and off time adjustments.
! WARNING:To avoid electric shock, personal in-jury, or death, disconnect the electricpower before performing any mainte-nance.
30
Figure 27. Integrated Control
R C
Y G
W
Flame Signal Light (Yellow)
60 90 120
180
TWIN
3 Amp FuseCOM
24 V
HU
M
Neutrals
4 1
5 2
6 3
7
8
9
4
5
6
1
2
3
EA
C
HU
M
M1
M2
M3
CO
OL
HE
AT L1
XF
MR
Unused Motor Leads
EA
C
Electronic Air Tap(.5A@ 120 VAC)
StatusLight (Red)
Humidifier Tap(.5A@ 120 VAC)
ConnectNeutralLead of
ElectronicAir Cleaner
and/or HumidifierHere.
Common Leads
Blower OffTiming
These motor speed taps arenot used for two-stage models
Verifying Burner OperationTo verify operation of the burners, make surethat the furnace door is in place and that thereis power to the furnace. Set the thermostat toa temperature above room temperature andobserve the ignition sequence. The burnerflame should carry over immediately betweenall burners. The flames should be blue, withoutyellow tips. Flames should extend from eachburner without lifting off, curling, or floating. Afterverifying satisfactory flame characteristics, setthe thermostat to a temperature below roomtemperature and verify that the burner flameextinguishes completely.
Verify Operation of the Supply Air LimitSwitchTo verify operation of the supply air limit switch,make sure that the blower door is in place andthat there is power to the furnace. Block thereturn airflow to the furnace by installing a close-off plate in place of or upstream of the filter(s).Set the thermostat to a temperature aboveroom temperature and verify that the Sequenceof Operation is as described in these instruc-tions. The limit switch should function to turn offthe gas valve within approximately four minutes(the exact time depending on the efficiency ofthe close-off in blocking the return air to thefurnace). The circulating air and combustionblowers should continue to run when the limitswitch opens. Remove the close-off immedi-
ately after the limit switch opens. If the furnaceoperates for more than four minutes with noreturn air, set the thermostat to a temperaturebelow room temperature, shut off the power tothe furnace, and replace the limit switch.
DESCRIPTION OF COMPONENTSFigure 29 shows the location of each of thefunctional components described below. Also,refer to the Sequence of Operation Section ofthis manual . If any component of the furnacemust be replaced, use only factory authorizedreplacement parts. See the Replacement PartsList for the factory authorized replacement foreach component.
Flame SensorThe flame sensor acts to prove that flame hascarried over from the igniter to the opposite endburner. If no flame is sensed, the furnace willshut down within 7 seconds of ignition.
Flame Roll-Out SwitchThe flame roll-out switch verifies that the burnerflames are drawn into the heat exchangertubes. If the burner flames are not properlydrawn into the heat exchanger, the flame roll-out switch will open. The circulating air blower(and combustion blower, if connected) willcontinue to operate if the flame roll-out switchopens.
31
Figure 28. Wiring Diagram for Upflow and Downflow Models
For Upflow and Downflow Series Residential Furnaces
WD#710355-0
IGNITOR
INDUCER
GAS
VALVE
SUPPLY AIRLIMIT SWITCH(ALL MODELS)
VENTSAFETY SWITCH
(SELECTMODELS ONLY)
TRANSFORMER
FLAME SENSOR
C
GREEN
BLACKWHITE
BLUE BLUE
24 V 120 V
OR
AN
GE
BL
UE
BL
UE
YELLOWBROWN
RED
BLACK
WHITE
ORANGE
BLUE
BL
AC
K
OR
AN
GE
BLACK
RED
AIR CONDITIONERCONDENSING UNIT
BLACK
BLACK
BLOWER DOORSWITCH
R
WHITE
BLACK
WHITE W/ BLK STRIPES
BLK W/ WHITE STRIPES
WHITE (NEUTRAL)
BLACK 120V
GROUND
ROOM THERMOSTAT
3 OR 4 SPEED MOTOR
H
MHML
L
C
WH
ITE
RE
D
OR
AN
GE
BL
UE
BL
AC
K
MOTORPLUG
1
2
3
4
5
6
BLACK
BLUE
FLAME ROLL-OUTSWITCH
(ALL MODELS)
VENTPRESSURE SWITCH(93+ MODELS ONLY)
PRESSURESWITCH
R
Y
G
W
C
Y
1801209060
These wires arenot present
on all models
BLOWERDECK SWITCH
(SELECTMODELS ONLY)
Legend
Field WiringFactory Wiring:
Low VoltageHigh Voltage
Power On
Limit Circuit Open or External Load On "W"
Pressure Switch is Open with Inducer On
Pressure Switch is Closed with Inducer Off
Ignition Failure (Check Ground)
115 VAC & Neutral Reversed or no Ground
False Flame or Gas Valve Relay Shorted
ON
1 FLASH
2 FLASHES
3 FLASHES
4 FLASHES
5 FLASHES
Continuous
STATUSRED LIGHTFAULT CONDITION
Power Off
Low Flame Sensor Signal
Flame Present
ContinuousFlash
OFF
ON
FLAMEYELLOW
LIGHTFAULT CONDITION
BLUE
FLAMEROLL-OUT SWITCH
(SELECTMODELS ONLY)
Refer to the InstallationInstructions provided with the furnace for theproper heating andcooling speeds for yourapplication.
VENT SAFETY SWITCH(SELECT MODELS ONLY)
If any of the original wire as supplied with thefurnace must be replaced, it must be replacedwith wiring material having a temperature ratingof at least 105° C.
Use copper conductors only.
Gas ValveThe gas valve controls the flow of gas to theburners. When the gas valve is energized itautomatically opens and regulates the gaspressure in the manifold.
Pressure SwitchThe pressure switch verifies that the inducer isdrawing the combustion gases through the heatexchanger.
Supply Air Limit SwitchThe supply air limit switch prevents the airtemperature leaving the furnace from exceedingthe maximum allowable outlet air temperature.
Vent Safety SwitchThe vent safety switch shuts the furnace downif the vent becomes blocked or restricted.
32
10 Low VoltageTransformer
11 Burner Assembly12 Supply Air Limit Switch13 Blower Assembly14 Inducer
1 Igniter2 Flame Sensor3 Gas Valve4 Roll-Out
Switch(s)5 Pressure Switch
6 Control Board7 Blower Door
Switch8 Vent Assembly
(Upflow Models)9 Vent Switch
Figure 29. Location of Major Components
15 Combustion Tubew/insulation(Downflow Models)
16 Vent TransitionAssembly (Downflow Models)
3
41
6
7
1315
10
12
2
5
7
6
3
10
4
111
9
5
2
11
98
12
14
13
16
14
Upflow Models DownflowModels
MAINTENANCE
It is recommended that the furnace be checkedyearly. At a minimum, this check should includethe following items.
! WARNING:To avoid electrical shock, personal in-jury, or death, turn off the electric powerat the disconnect or the main servicepanel before making any electrical con-nections.
! WARNING:Products of combustion must not beallowed to enter the living space. Fail-ure to prevent products of combustionfrom being circulated into the living spacecan create potentially hazardous condi-tions including carbon monoxide poi-soning that could result in personal in-jury or death.
Vent SystemCheck the vent pipe to ensure that it is notcorroded or blocked by debris. Any corrodedsection of vent pipe must be replaced, and anyobstruction or blockage must be removed priorto operating the furnace.
Air Filter(s)
! WARNING:Never operate the furnace without a filterin place. Dust and lint in the return air canbuild up on internal components, result-ing in loss of efficiency, equipment dam-age, and possible fire.
Air filter(s) are not supplied with the fur-nace as shipped from the factory.
The installer must provide a high velocity filterand rack for a filter in the return air duct adjacentto the furnace, or in a return air grill to thefurnace. Filters should be changed or cleanedmonthly during the heating season. New or
33
newly renovated homes may require morefrequent changing until the construction dusthas been removed.
Filters for side return and bottom return appli-cations are available from your local distribu-tors.
LubricationThe bearings in the circulating air blower motorand inducer blower used in these furnaces arepre-lubricated and sealed at the factory. Nofurther oiling of the bearings is required for thelife of the motor.
Blower CompartmentThe blower compartment should be cleanedmonthly during the heating and cooling seasonsto remove any dirt and lint that may haveaccumulated in the compartment or on theblower and motor. Dirt and lint can createexcessive loads on the motor resulting in higherthan normal operating temperatures and short-ened service life.
Heat Exchanger and Burner MaintenanceThe furnace should operate for many yearswithout soot buildup in the flue passageways,however, the flue passageways, the vent sys-tem, and the burners should be inspected andcleaned (if required) by a qualified servicemanannually to ensure continued safe operation.Particular attention must be given to identifydeterioration from corrosion or other sources.
! WARNING:Holes in the vent pipe or heat exchangercan cause products of combustion toenter the home. Replace the vent pipe orheat exchanger if leaks are found. Failureto prevent products of combustion frombeing circulated into the living space cancreate potentially hazardous conditionsincluding carbon monoxide poisoningthat could result in personal injury ordeath.
Cleaning Of Flue PassagesIf the flue passages must be cleaned, follow thesteps below. See Figure 29 for componentlocation and identification.
1. Shut off the gas supply to the furnace either atthe meter or at the manual valve in the gassupply piping.
2. Turn off all power to the furnace and set thethermostat to the lowest temperature setting.
3. Remove the louvered door from the furnace.4. Turn the gas control lever to the OFF position.5. Disconnect the wires from the gas valve,
igniter, flame sensor, combustion air motor,flame roll-out switch, blocked vent switch, over-temperature limit switch, pressure switch.
! CAUTION:Label all wires prior to disconnectionwhen servicing controls. Wiring errorscan cause improper and dangerous op-eration.
6. Remove the silicone rubber tube from thecollector pan.
7. For *RA upflow models: Remove the screwsthat hold the vent control assembly to the toppanel.
8. Remove the nuts that hold the combustion airmotor to the collector pan, and remove thecomplete combustion air blower and combus-tion tube assembly. BE CAREFUL NOT TOBREAK THE SEALS AT EACH END OF THECOMBUSTION AIR TUBE.
9. Remove the screws that hold the collector panin place, and remove the collector pan from thefurnace.
10. Using wrenches, separate the ground-jointunion in the gas supply piping at the furnace.
11. Remove the piping between the gas valve andthe ground-joint union, if necessary.
12. Remove the screws that hold the burner as-sembly in place and remove the burnerassembly. BE EXTREMELY CAREFUL NOTTO DAMAGE THE IGNITER WHILE RE-MOVING THE BURNER ASSEMBLY.
13. The furnace heat exchanger tubes can now becleaned by the use of a round wire brushattached to a length of high grade stainless steelcable, such as drain cleanout cable. Attachvariable speed reversible drill to the other endof the spring cable. Slowly rotate the cable withthe drill and insert it into the top portion of the heatexchanger. While reversing the drill, work thecable in and out several times to obtain sufficientcleaning. Repeat this sequence for each heatexchanger tube.
14. When all heat exchanger tubes have beencleaned, any debris inside the tubes can beremoved with the nozzle of a vacuum cleaner.
15. With a light, check the condition of the upper andlower sections of the heat exchanger tube.
34
16. Inspect the burners and clean them (if neces-sary) with a soft wire brush and/or the nozzleof a vacuum cleaner. BE EXTREMELY CARE-FUL NOT TO DAMAGE THE IGNITERWHILE CLEANING THE BURNER.
17. Replace all the parts in reverse order fromwhich they were removed.
18. Follow the lighting instructions found on thefurnace door to return the furnace to operation.Verify proper operation after servicing.
Cleaning of Burners If the burners must be cleaned, follow the steps
below. See Figure 30 for component locationand identification.
1. Shut off the gas supply to the furnace either atthe meter or at a manual valve in the supplypiping.
2. Turn off all power to the furnace and set thethermostat to the lowest temperature setting.
3. Remove the upper louvered door from thefurnace.
4. Turn the gas control lever to the OFF position.5. Disconnect the wires from the gas valve,
igniter, and flame sensor.6. Using wrenches, separate the ground-joint
union in the gas supply piping at the furnace.7. Remove the piping between the gas valve and
the ground-joint union, if necessary.8. Remove the screws that hold the burner as-
sembly in place and remove the burner assem-bly. BE EXTREMELY CAREFUL NOT TODAMAGE THE IGNITER WHILE REMOV-ING THE BURNER ASSEMBLY.
9. Inspect the burners and clean them (if neces-sary) with a soft wire brush and/or the nozzleof a vacuum cleaner. BE EXTREMELY CARE-FUL NOT TO DAMAGE THE IGNITERWHILE CLEANING THE BURNER.
10. Replace all the parts in reverse order fromwhich they were removed.
11.Follow the lighting instructions found on thefurnace door to return the furnace to operation.Verify proper operation after servicing.
SYSTEM OPERATION INFORMATIONGeneralProper maintenance is most important to achieve
the best performance from a furnace. Followthese instructions for years of safe, trouble freeoperation.
1. Do not place combustible materials on or againstthe furnace cabinet or within 6 inches of the ventpipe.
2. Do not store gasoline or any other flammablevapors and liquids in the vicinity of the furnace.
3. Change or replace the air filters monthly duringany period when the circulating blower isoperating regularly.
4. Always replace the doors on the furnace afterservicing or cleaning/changing the filters. Donot operate the furnace without all doors andcovers in place.
5. Avoid operating the furnace when windows anddoors are open.
6. Be sure that the thermostat is properlyinstalled and is not being affected by draftsor heat from lamps or other appliances.
Sequence of OperationThe operating sequences for the heating, cooling,
and fan modes are described below. Refer tothe field and furnace wiring diagrams; Figures25, 26, 27 and 28.
Heating Mode:1. On a call for heat the thermostat closes, apply-
ing 24 VAC to the W terminal on the controlboard.
2. The control board checks for continuity on the24 VAC limit control circuit (over-temperaturelimit switch, flame rollout switches and blockedvent switch in series). If an open limit is detectedthe control board will energize the inducer andthe conditioned air blower. All other systemfunctions will be inoperable until the limit circuitcloses. While the limit is open, the red LED willpulse at a rate of 1 blink per unit time.
3. The furnace control checks for continuity acrossthe pressure switch (24 VAC). If the pressureswitch is closed the heat mode sequence willnot continue. If it remains closed for 10 secondsthe red LED will blink 3 times repetitively until thefault condition clears.
4. The inducer is energized.
5. The pressure switch will close. If the pressureswitch does not close after 10 seconds the faultLED will blink 2 times repetitively and the inducerwill continue to run until the switch is closed.
6. The inducer will pre-purge for 30 seconds andthen the igniter will start its warm-up as follows:
Initial Power up: After 30 seconds of igniterwarm-up the gas valve (24 VAC) will then open.The igniter circuit will stay energized for 3seconds after the gas valve opens.
35
After Initial Power up: The control has a pro-grammed adaptive ignition feature which variesthe warm-up period as follows: If ignition issuccessful the warm-up is reduced by 3-seconds on each subsequent call for heat untilignition failure occurs. Upon ignition failure, thewarm-up is increased by 3-seconds on thenext try. If successful, the timing remains fixedat this level. In general, whenever ignition failureoccurs the warm-up interval is increased by3-seconds on the next try. And if successful, itremains there. Minimum and maximum warm-up time limits are set at 6 and 54-seconds,respectively.
7. The furnace control must prove flame via theflame sensor 5 seconds after the gas valveopens. If flame is sensed, all burners are on andthe igniter cools off. If no flame is sensed, the gasvalve closes immediately and the inducer con-tinues to run. A second trial for ignition (step 6)begins if no flame is sensed on the fifth try forignition, the furnace control is locked and the redLED will blink 4 times repetitively. The thermo-stat must be opened for at least ten seconds toreset the furnace control after a lock out.Otherwise, the furnace will attempt anotherignition sequence in 1 hour.
8. The furnace control energizes the circulatingair blower on the heating speed 30 secondsafter the gas valve circuit is energized .
9. When the thermostat has been satisfied, gasvalve is de-energized.
10. The inducer is de-energized after a 30-secondpostpurge.
11. The furnace control keeps the circulating airblower energized for 120 seconds (factory set)or 60, 90, or 180 seconds (field adjustable).(See Figure 27.)
12. Abnormal conditions: If a limit opens duringoperation, the inducer and circulating air blowercontinue to operate. The gas valve is de-energized immediately. The blowers continueto operate until the limit closes. When the limitcloses the inducer blower is de-energizedimmediately. The circulating air blower contin-ues to operate for the specified delay (factoryset at 120 seconds).
Cooling Mode:1. On a call for cooling the thermostat closes,
applying 24 VAC to the G and Y terminals on the
furnace control. This closes the compressorcontactor.
2. The furnace control energizes the circulatingblower (115 VAC) on the cooling speed.
3. When the thermostat is satisfied, the G and Yterminals on the control board are de-energizedopening the compressor contactor.
4. The circulating air blower is de-energized aftera 90-second delay.
Fan Mode:1. On a call for fan operation, the thermostat
applies 24VAC to the G terminal on the furnace controlboard.
2. The circulating air blower is energized immedi-ately on the heating speed.
3. If the furnace is operated in the continuous ONposition at the thermostat and is then switchedto AUTO, the circulating blower will operate fora specified delay (factory set at 120 seconds).
Furnace Fails to Operate
If the furnace does not operate check thefollowing:1. Is the thermostat operating properly?2. Are the blower compartment door(s) in place?3. Is the furnace disconnect closed?4. Has the circuit breaker tripped or the control
board fuse burned open?5. Is the gas turned on?6. Are any manual reset switches open?7. Is the filter dirty or plugged?8. Is the flame sensor coated? (Remove and
clean with emery cloth.)
If the furnace locks out after 5 attempts forignition, it will try again every hour if a call for heatremains. If the inducer and circulating air blow-ers are operating, and items 1 through 8 havebeen checked, press the red reset button on thevent safety switch (See Figure 29). If the fur-nace operates after depressing the reset but-ton, contact a qualified serviceman to identifyand repair the problem.
If the furnace continues to not operate, depressthe red reset buttons on the flame roll-outswitches. (See Figure 29.) If the furnace oper-ates after depressing the reset buttons, contacta qualified servicemen to identify and repair theproblem.
O'Fallon, MO
7085020 (Replaces 7084270)
Specifications and illustrations subject to change withoutnotice and without incurring obligations. Printed in
U.S.A. (11/05)
¢708502{¤7085020
INSTALLATION/PERFORMANCE CHECK LIST
LOCATION _________________ CITY ___________________ STATE ______________
INSTALLER ________________ CITY ___________________ STATE ______________
UNIT MODEL NUMBER ________________________________
UNIT SERIAL NUMBER _________________________________
Minimum Clearances per Table 3? _____
Electrical Connections tight? __________
Line Voltage Polarity correct? _________
Supply Voltage: _________ Volts
Blower Motor HP: ___________________
FUEL TYPE:
Natural Gas _______________________
LP/Propane ________________________
Gas Piping Connections
leak-tested? ______________________
Gas Line Pressure: _________________
(in. water column, with furnace operating)
Manifold Pressure: __________________(in. water column, with furnace operating)Is there adequate fresh air supply for
combustion and ventilation? ___________
Furnace Input: _________________ (Btuh)
Supply Air Temperature: _________ (° F)
Return Air Temperature: _________ (° F)
Temperature Rise: ______________ (° F)
Are Flue Connections tight? _____________
Is there Proper Draft? _________________
Is Vent free from restrictions? ___________
Is the Filter(s) secured in place? _________
Is the Filter(s) clean? __________________
Has the Thermostat been calibrated? _____
Is the Thermostat level? ________________
Is the Heat Anticipator Setting correct? ____
Has the Owner's Information been reviewed
with the homeowner? __________________
Has the Literature Package been left near
the furnace? _________________________
Figure 30. Twinning
W G Y RThermostat
A/CUnit
Twin Terminal
RCYGW
RCYGW
Twin Terminal
TwinningThe control board on these furnaces is capableof being twinned to another furnace of the sameseries. If using UTEC Control Boards, leave thefuses installed on each board. The thermostatwires and the 1/4 inch quick-connect terminalsmarked “TWIN” on the furnace controls mustbe wired for twinning. (See Figure 30.)
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