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Electric Heater KitsInstallation in Standard and Variable Speed Indoor Air Handlers
H6HK Series
Installation Instructions
IMPORTANT:The instructions included with this heater kit are for installations in air handlers only.
These instructions are primarily intended to assist qualifi ed individuals experienced in the proper installation of heating and/or air condi-tioning appliances. Some local codes require licensed installation/service personnel for this type of equipment. All installations must be in accordance with these instructions and with all applicable national and local codes and standards.
Before beginning the installation, read these in-structions thoroughly and follow all warnings and cautions in the instructions and on the unit.
Improper installation, service, adjustment, or maintenance can cause explosion, fi re, electri-cal shock, or other conditions which may result in personal injury or property damage. Unless
otherwise noted in these instructions, only fac-tory authorized kits or accessories may be used when modifying this product.
INTRODUCTIONThe H6HK Series of electric heater kits are approved for fi eld installation in B5 air handlers and variable speed air handlers. All sizes are available with factory-provided circuit-breakers for short circuit protection and to provide a disconnecting means. Also available are 5, 8, and 10 kw electric heater kits without circuit-breakers. Refer to the National Electric Code (ANSI/NFPA 70) and applicable local codes for over-current protection and disconnect requirements.
Note: The 20, 25, and 30 kw electric heater kits are Not Approved for installation in A-cabinet air handlers. Reference Table 2 for all Heater Kit applications.
Note: These instructions are written assuming the air handler is in the upfl ow position (with the outlet facing up). For horizontal and downfl ow applications, it is recommended that the electric heater kit be installed prior to installation of the air handler.
2
WARNING:To avoid the risk of electric shock, personal injury, or death, disconnect all electrical power to the unit before performing any maintenance or service. The unit may have more than one electrical power supply.
AIR HANDLER ELECTRICAL SUPPLYAll wiring must be in compliance with the National Electric Code and applicable local codes.
If the air handler was previously installed without electric heat the existing supply wiring may not be suffi cient to carry the increased load. If installing electric heat in the B5 air handler the supply wiring can be aluminum or copper since the circuit breakers and terminal blocks supplied are approved for either wire type. Be sure to follow all of the rating information on the circuit breaker or terminal block and ensure that the supply wiring is sized according to the current NEC codes and any other state or local codes. See the rating label or Table 1 for minimum circuit ampacities and maximum overcurrent protection.
All electric heater kits of 10 kw or less are supplied from the factory confi gured for use with a single supply circuit. Electric heater kits greater than 10 kw are supplied from the factory confi gured for use with two supply circuits. See the ratings label or Table 1 for individual circuit ampacities and over-current protection ratings. If a single supply is desired, accessory kit #913874 is required to convert to single circuit connection.
INSTALLATIONRemove the upper access door from the air handler. Remove the circuit breaker bracket and cover package from the heater kit.
Remove the top-most element Close-off Plate from the back of the air handler control box. For two-tiered electric heater kits remove both Close-off Plates. For three-tiered electric heater kits remove all three Close-off Plates.
Installation into Air Handler, All Heater Kits Insert the element assembly into the opening in the air handler control box being careful not to damage the element wire or the ceramic element supports. Heating element alignment rod(s) will slide into alignment holes in the back of the air handler element box. Secure the element assembly to the back of the air handler control box with the screws removed when removing the element close-off plate(s).
For 25 kw and 30 kw Heater Kits, attach the Auxiliary circuit board bracket to the lower right side of the installed Heater Kit Assembly with two screws that were removed from the element close-off plate(s). Snap on the Auxiliary circuit board as shown below.
Figure 1. Sample Installation.
Shown without access door.
Note: on some units a shipping bracket must be removed before installing the circuit breaker bracket.
Install the circuit-breaker bracket (See Figure 1). Connect the 2-Pin Power plug from the element assembly into the unit's 2-Pin power plug. Connect the 7-Pin Harness from the element assembly to the unit's circuit board. For 25 kw and 30 kw Heater Kits, also attach the 4-Pin and 3-Pin Harnesses to the Auxiliary circuit board.
3
Table 1. Electrical Ratings
A wiring diagram and a ratings label are supplied with the electric heater kit. Attach the wiring diagram to the Blower Housing.
When installing the electric heater kit into a stan-dard air handler, attach the rating label (included with the electric heater kit) on the air handler unit data label (located on the lower access door) over the electrical data section.
When installing the electric heater kit into a vari-able speed air handler the rating label supplied with the kit will not be used. Check the appropri-ate block on the air handler additional ratings label located on the lower access door.
WARNING:To avoid risk of electric shock, personal injury, or death, disconnect electrical power to the unit before performing any maintenance or service. The unit may have more than one electric power supply.
Standard Air Handler (A & B size) Variable Speed & Std Air Handler (C size)
Circuit Circuit Circuit Single Circuit Circuit Circuit Single Circuit Circuit Circuit Single Circuit Circuit Circuit Single
A B C Circuit A B C Circuit A B C Circuit A B C Circuit
005H-XX 240 4.8 - - - 30 - - - 30 - - - 34 - - - 40
008H-XX 240 7.5 - - - 45 - - - 50 - - - 48 - - - 50
010H-XX 240 9.6 - - - 55 - - - 60 - - - 59 - - - 60
015H-XX 240 14.4 55 25 - 80 60 30 - 90 59 25 - 83 60 30 - 90
020H-XX 240 19.2 55 50 - 105 60 60 - 125 59 50 - 109 60 60 - 125
025H-XX 240 24.0 - - - - - - - - 59 50 25 134 60 60 30 150
030H-XX 240 28.8 - - - - - - - - 59 50 50 159 60 60 60 175
005H-XX 208 3.6 - - - 27 - - - 30 - - - 30 - - - 40
008H-XX 208 5.6 - - - 39 - - - 40 - - - 42 - - - 50
010H-XX 208 7.2 - - - 48 - - - 50 - - - 52 - - - 60
015H-XX 208 10.8 48 21 - 70 50 25 - 80 52 22 - 73 60 25 - 80
020H-XX 208 14.4 48 43 - 92 50 50 - 100 52 43 - 95 60 50 - 100
025H-XX 208 18.0 - - - - - - - - 52 43 22 117 60 50 25 125
030H-XX 208 21.6 - - - - - - - - 52 43 43 138 60 50 50 150
009Q-XX 240 9.0 - - - 32 - - - 40 - - - 36 - - - 40
015Q-XX 240 14.4 - - - 48 - - - 50 - - - 52 - - - 60
009Q-XX 208 6.8 - - - 29 - - - 30 - - - 32 - - - 40
015Q-XX 208 10.8 - - - 43 - - - 50 - - - 46 - - - 50
Max. Over-Min. Circuit Ampacity
Max. Over-Current Protection
Min. Circuit Ampacity
Model Number H6HK- Voltage KW
Current Protection
Electric Heater Kits without Circuit Breakers —Attach the supplied power terminal block to the circuit-breaker bracket with the supplied screws as shown in Figure 2.
Using the 1/4" terminals, connect the red supply wire(s) from the element assembly to one pole of the terminal block and connect the black wires to the other pole.
Figure 2. Circuit Breaker Brackets. Shown with Line Cover Removed and Terminal Block Installed.
4
is required by code in order to protect installers from the line/supply wiring. The line cover should be installed as shown in Figure 4.
5, 8, and 10 kw electric heater kits supplied with a circuit breaker.
Snap the circuit breaker on to the circuit breaker bracket as shown in Figure 5. The orientation of the circuit breaker must be as shown. (Side with 1/4" terminals to the right).
Remove the lower circuit breaker knockout from the air handler upper access door.
15, 20, 25, and 30 kw electric heater kits sup-plied with circuit breakers.
Snap the circuit breakers on to the circuit breaker bracket as shown in Figure 5. The orientation of the circuit breakers must be as shown in Figure 1. (Side with 1/4" terminals to the right).
The heavy red and black supply leads are bundled by circuit with wire ties at the factory. The bundle coming from the top element tier is circuit “A” (note: the element assembly is right-side-up when the limits are on the right side). The bundle coming from the second element tier is circuit “B”. The bundle coming from the bottom element tier is circuit "C".
Remove all necessary circuit breaker knockouts in the air handler upper access door.
3-Phase 9 and 15 kw electric heater kits sup-plied with a circuit breaker.
Figure 5. Installation of Circuit Breakers
Electric Heater Kits with Circuit Breakers —NOTE : Circuit breakers supplied with the H6HK electric heater kits are for short-circuit protection of the internal wiring and to serve as a unit disconnect. Circuit breakers supplied with the H6HK electric heater kits do not provide over-current protection of the supply wiring. Over-current protection of the supply wiring must be provided at the distribution panel and sized as shown in Table 1 or on the unit data label and per the NEC and applicable local codes. In some cases the over-current protection specifi ed in Table 1 or on the unit data label is less than the 60 amp rating of the circuit breakers used in the H6HK electric heater kits. This is because the function of the over-current protection required at the distribution panel (field supplied) and the function of the circuit breakers in the H6HK electric heater kit is different.
Heater Kits with circuit breakers are supplied with a line cover shown in Figure 3. The line cover
Figure 3. Line Cover
Figure 4. Line Cover Installed
5
Snap the 3-pole circuit breaker on to the circuit breaker bracket as shown in Figure 5. The ori-entation of the circuit breaker must be as shown. (Side with 1/4" terminals to the right).
Remove all circuit breaker knockouts in the air handler upper access door.
STAGINGAll Single-phase heater kits are internally staged using the B5 Air Handler Circuit Board logic. Reference B5 Air Handler Installation Instruc-tions for "slow" or "fast" staging options. All Three-phase heater kits are not equipped for internal staging.
POWER WIRINGAll wiring must comply with the current revision of the National Electric Code and must be sized for the minimum ampacities as listed on the unit data label or in Table 1.
If a single circuit adaptor kit is used it may need to be re-confi gured for some applications. Remove the single circuit adaptor kit cover and verify that the lugs are confi gured correctly for the application. If the lugs are not confi gured for the application, reference the instructions included with the ki t and modify the confi guration. Install the single circuit adaptor kit (if used) in the line side (“on” end) of the circuit breakers. Tighten the lugs securely (45 in-lbs recommended).
Connect the supply wiring to the circuit breaker(s), single circuit adaptor kit, or terminal block. Tighten the lugs securely.
When using multiple supply circuits verify that the supply sized for circuit “A” is connected to the circuit breaker that is connected to the top element assembly.
Install metal circuit breaker line cover on the left side of the circuit breaker to cover the sup-ply wires.
Note; on 3-phase heater kit installations after the air handler door has been attached to the unit, install the circuit breaker close-off to the opening in the door just above the circuit breaker.
MOTOR SPEED SELECTIONStandard Air Handlers — The blower speed is preset at the factory for operation at the same speed for heating and cooling, by using the blower motor jumpering terminal on the blower motor and connecting it to the desired speed with both the red and black wires connected to the jumpering terminal. For optimum system performance and comfort, it may be necessary to change the factory set speed. To change the blower speed, disconnect all electrical power to the unit and remove the upper door. Remove the black and red wires from the blower motor jumpering terminal. Discard the blower motor jumpering terminal.
Connect the heating speed wire (red) and the cooling speed wire (black) to the desired blower speed marked on the terminal block of the blower motor. On standard 3 speed motors terminal 4 = Hi speed, terminal 5 = Med speed and terminal 6 = Low speed. Standard C cabinet units are equipped with 5 selectable blower speeds. Termi-nal 1=Low speed, terminal 2=Medium Low speed, terminal 3=Medium speed, terminal 4=Medium Hi speed and terminal 5=Hi speed.
IMPORTANT: After making any changes to the blower speed setting be sure to bundle and insulate any unused blower motor leads so that they will not come in contact with the air handler cabinet or non-insulated live parts.
High speed operation may be required when using a 20, 25, and 30 kw electric heater kit in a downfl ow application. (See Clearance section.)
Replace the upper door and secure it to the unit. Restore power to the unit.
Variable Speed Air Handlers — The minimum electric heat airfl ow is selected by setting switches on the air handler circuit board. Selecting the minimum electric heat airfl ow sets the minimum air fl ow that will be produced whenever electric heater kits are energized. When the electric heater kits are energized along with a heat pump the airfl ow may be higher depending on the basic cooling/heat-pump airfl ow setting. Reference the variable speed air handler installation instructions for further details.
6
Table 2. Blower Heating Speed
MODEL IDENTIFICATION
Product TypeH - Heater
Generation6 - Sixth Series
Product Identifi erHK - Heater Kit
H6 H K - 020 H - 2 1
Staging
Circuit Breakers
Electrical CodeH : 240 - 1 - 60 Q : 208/240 - 3 - 60
Primary Capacity005 - 5kw 009 - 9kw 015 - 15kw 025 - 25kw008 - 8kw 010 - 10kw 020 - 20kw 030 - 30kw
(1) Only on *30 (2.5 Ton) model air handlers
Model H6HK
Applicable Cabinet SizeMinimum Required Blower
Heating SpeedA B C Up-Flow Horizontal Down-Flow
005H X X X LOW LOW LOW008H X X X LOW LOW LOW010H X X X LOW LOW LOW015H X X X LOW LOW MED020H X X LOW LOW HIGH025H X X MED MED HIGH030H X MED MED N/A009Q X X LOW LOW LOW015Q X X LOW LOW MED
(1)*
CLEARANCEStandard Air Handlers — All electric heater kits less than 20 kw are approved for use in air handler installations with zero-clearance to combustibles at any blower speed. For horizontal and upfl ow confi guration, air handlers equipped with 20, 25, and 30 kw electric heater kits are approved for installation with zero clearance to combustibles at any blower speed. When using a 20, 25 kw electric heat kit in a downfl ow installation, the blower MUST be set for high speed for both heating and cooling.
Variable Speed Air Handlers — All installations of H6HK electric heater kits in variable speed air handlers are approved for zero-clearance to combustibles when the minimum electric heat airfl ow is set as directed in these instructions.
7
Mo
del
H6H
K
No
.C
om
po
nen
t D
escr
ipti
on
005H
-01
005H
-11
008H
-01
008H
-11
009Q
-11
010H
-01
010H
-11
015H
-21
015Q
-11
020H
-21
025H
-31
030H
-31
1S
et o
f Wire
s28
8351
R28
8351
R28
8361
R28
8361
R29
1531
R28
8361
R28
8361
R28
8371
R29
1531
R28
8381
R28
9011
R28
8391
R
2H
arne
ss, L
ow V
olta
ge63
4664
6346
6463
4665
6346
6563
4665
6346
6563
4665
6346
6663
4665
6346
6763
4668
6346
68
3
Ele
men
t Ass
y49
1214
R49
1214
R49
1226
R49
1226
R49
1216
R49
1225
R49
1225
R49
1214
R49
1214
R49
1225
R49
1214
R49
1225
R
Ele
men
t Ass
y49
1227
R49
1225
R49
1225
R49
1225
R
4R
elay
6222
1062
2210
6222
1062
2210
6222
1062
2210
6222
1062
2210
6222
1062
2210
6222
1062
2210
5
Lim
it S
witc
h62
6487
6264
8762
6458
6264
5862
6458
6264
5862
6458
6264
5862
6458
6264
5862
6458
6264
58
Lim
it S
witc
h62
6487
6264
87
6Te
rmin
al B
lock
6317
6263
1762
6317
62
7Li
ne C
over
2574
4225
7442
2574
4225
7442
2574
4225
7442
2574
4225
7442
2574
4225
7442
2574
4325
7443
8B
rack
et, C
ircui
t Bre
aker
2848
6128
4861
2848
6128
4861
2848
6128
4861
2848
6128
4861
2848
6128
4861
2848
6228
4862
9C
ircui
t Bre
aker
6322
4963
2249
6322
2563
2249
6322
4963
2225
6322
4963
2249
6322
49
10H
arne
ss, 2
Pin
Pow
er28
8861
R28
8861
R28
8861
R28
8861
R28
8861
R28
8861
R28
8861
R28
8861
R28
8861
R28
8861
R
11H
arne
ss, 3
Pin
6346
7063
4671
12B
rack
et, C
ircui
t Boa
rd28
9841
2898
41
13C
ircui
t Boa
rd62
4664
6246
64
14C
onta
ctor
6218
8862
1888
15R
elay
Bra
cket
2886
2128
8621
2886
2128
8621
2886
2128
8621
2886
2128
8621
2886
2128
8621
2886
2128
8621
16C
over
Pla
te, L
imit
hole
2922
1129
2211
RE
PL
AC
EM
EN
T P
AR
TS
LIS
TH
6HK
Hea
ter
Kit
s
8
Figure 5. Typical System Wiring DiagramH6HK, 8/10 kw 1-stage with circuit breaker
GREY
GR
EY
BL
UE
OR
AN
GE
1 2 3 4 5 6 7
POWER
LIMIT
RED
RE
D
RE
D
BL
AC
K
BL
AC
K
RE
D
BL
AC
K
RELAY
RELAY
TERMINALBLOCK(for selectmodels only)
CIRCUITBREAKER
Legend
Field Wiring
Factory Wiring:Low Voltage
High Voltage
NOTES
1) If any of the original wire supplied with this unit must be replaced, it must be replaced with wiring material of the same gauge size and temperature rating.2) The installation of this heater kit may require a change in the blower speed tap connection. See Installation Instructions for details.3) Use copper conductors with a minimum temperature rating of 60°C for supply connections.
ELEMENT
BLACK
BLACKELEMENT
RED
710561A
Figure 4. Typical System Wiring DiagramH6HK, 5 kw 1-stage with circuit breaker
TERMINALBLOCK(for selectmodels only)
CIRCUITBREAKER(Circuit breakermodels only)
Legend
Field WiringFactory Wiring:
Low VoltageHigh Voltage
RELAY
GR
EY
OR
AN
GE
BL
AC
K
RE
D
RE
D
LIMIT
POWER
BLACK1 2 3 4 5 6 7
NOTES
1) If any of the original wire supplied with this unit must be replaced, it must be replaced with wiring material of the same gauge size and temperature rating.2) The installation of this heater kit may require a change in the blower speed tap connection. See Installation Instructions for details.3) Use copper conductors with a minimum temperature rating of 60°C for supply connections.
BLACK REDELEMENT
710560A
9
Figure 7. Typical System Wiring Diagram20 kw 1-stage with circuit breakers
POWER
Legend
Field WiringFactory Wiring:
Low VoltageHigh Voltage
NOTES
1) If any of the original wire supplied with this unit must be replaced, it must be replaced with wiring material of the same gauge size and temperature rating.2) The installation of this heater kit may require a change in the blower speed tap connection. See Installation Instructions for details.3) Use copper conductors with a minimum temperature rating of 60°C for supply connections.
CIRCUIT BREAKERS
SUPPLY VOLTAGE GROUND
GREY
ORAN
GE
BLUE
YELL
OW
RELAY
RELAY
RELAY
ELEMENT LIMIT
BLAC
KBL
ACK
BLAC
K
RED
RED
BLACK
BLACK
BLACK
ELEMENT
ELEMENT
RED
RED
RED
RED
RELAY
BROW
N
ELEMENTBLACK
LIMIT
RED
RED
1 2 3 4 5 6 7
RED
BLAC
K
Figure 6. Typical System Wiring Diagram15 kw 1-stage with circuit breakers
CIRCUIT BREAKERS
SUPPLY VOLTAGE GROUND
1 2 3 4 5 6 7
POWER
GREY OR
ANGE BL
UEYE
LLOW
RELAY
RELAY
RELAY
ELEMENT LIMIT
LIMIT
RED
BLAC
KBL
ACK
Legend
Field WiringFactory Wiring:
Low VoltageHigh Voltage
BLAC
K
RED
RED
RED
BLACK
RED
BLACK
BLACK
BLACK
ELEMENT
ELEMENT
NOTES
1) If any of the original wire supplied with this unit must be replaced, it must be replaced with wiring material of the same gauge size and tempera-ture rating.
2) The installation of this heater kit may require a change in the blower speed tap connection. See Installation Instructions for details.
3) Use copper conductors with a minimum temperature rating of 60°C for supply connections.
RED
RED
710563A
710564A
10
Fig
ure
8. T
ypic
al S
yste
m W
irin
g D
iag
ram
25 k
w 1
-sta
ge
wit
h c
ircu
it b
reak
ers
CIR
CU
IT
BR
EA
KE
RS
SU
PP
LYV
OLT
AG
EG
RO
UN
D
12
34
56
71
23
41
23
POW
ER
RED
BLAC
K
GREYORANGE
BLUEYELLOW
YELLOW
BROWN
BROWN
WHITEGREY
RELA
Y
RELA
Y
RELA
Y
RELA
Y
RELA
Y
LIM
IT
LIM
IT
LIM
IT
REDRED
BLACKBLACK
Leg
end
Fie
ld W
irin
gFa
cto
ry W
irin
g:
Lo
w V
olt
age
Hig
h V
olt
age
BLACKBLACK
REDRED
BLACK
RED
RED
RED
RED
RED
NO
TE
S
1) I
f an
y o
f th
e o
rig
inal
wir
e su
pp
lied
wit
h
this
un
it m
ust
be
rep
lace
d, i
t m
ust
be
rep
lace
d w
ith
wir
ing
mat
eria
l of
the
sam
e g
aug
e si
ze a
nd
tem
per
atu
re r
atin
g.
2) T
he
inst
alla
tio
n o
f th
is h
eate
r ki
t m
ay
req
uir
e a
chan
ge
in t
he
blo
wer
sp
eed
tap
co
nn
ecti
on
. See
Inst
alla
tio
n In
stru
ctio
ns
for
det
ails
.3)
Use
co
pp
er c
on
du
cto
rs w
ith
a m
inim
um
te
mp
erat
ure
rat
ing
of
60°C
for
sup
ply
co
nn
ecti
on
s.
ELEM
ENT
ELEM
ENT
ELEM
ENT
ELEM
ENT
ELEM
ENT
BL
AC
K
BL
AC
K
BL
AC
K
BL
AC
K
RED
RED
BL
AC
K
BL
AC
K
710565A
11
Fig
ure
9. T
ypic
al S
yste
m W
irin
g D
iag
ram
30 k
w 1
-sta
ge
wit
h c
ircu
it b
reak
er
CIR
CU
IT
BR
EA
KE
RS
SU
PP
LYV
OLT
AG
EG
RO
UN
D
12
34
56
71
23
41
23
POW
ER
RED
BLAC
K
GREYORANGE
BLUEYELLOW
YELLOW
BROWN
BROWN
WHITEGREY
RELA
Y
RELA
Y
RELA
Y
RELA
Y
RELA
Y
LIM
IT
LIM
IT LIM
IT
REDRED
BLACKBLACK
Leg
end
Fie
ld W
irin
gFa
cto
ry W
irin
g:
Lo
w V
olt
age
Hig
h V
olt
age
BLACKBLACK
REDRED
BLACK
RED
RED
NO
TE
S
1) I
f an
y o
f th
e o
rig
inal
wir
e su
pp
lied
wit
h t
his
un
it
m
ust
be
rep
lace
d, i
t m
ust
be
rep
lace
d w
ith
wir
ing
mat
eria
l of
the
sam
e g
aug
e si
ze a
nd
tem
per
atu
re r
atin
g.
2) T
he
inst
alla
tio
n o
f th
is h
eate
r ki
t m
ay r
equ
ire
a ch
ang
e
in
th
e b
low
er s
pee
d t
ap c
on
nec
tio
n. S
ee In
stal
lati
on
In
stru
ctio
ns
for
det
ails
.3)
Use
co
pp
er c
on
du
cto
rs w
ith
a m
inim
um
tem
per
atu
re
r
atin
g o
f 60
°C fo
r su
pp
ly c
on
nec
tio
ns.
Y
RELA
Y
RED
RED
RED
RED
RED
RED
RED
BLACK
VIOLET
BL
AC
K
BL
AC
K
BL
AC
K
BL
AC
K
BL
AC
K
ELEM
ENT
ELEM
ENT
ELEM
ENT
ELEM
ENT
ELEM
ENT
ELEM
ENT
BL
AC
K
BL
AC
K
BL
AC
K
BL
AC
K
BL
AC
K
710566A
Specifi cations and illustrations subject to change without notice and without incurring obligations.
Printed in U.S.A. (09/06)
708514B (Replaces 708514A)
INSTALLER: PLEASE LEAVE THESE INSTALLATION INSTRUCTIONS WITH THE HOMEOWNER
¢708514%¤708514B
CIR
CU
IT
BR
EA
KE
RS
SU
PP
LYV
OLT
AG
E
GR
OU
ND
PO
WE
RP
LU
G
LIM
IT
Leg
end
Fie
ld W
irin
gFa
cto
ry W
irin
g:
Low
Vo
ltag
eH
igh
Vo
ltag
e
NO
TE
S
1) T
he
blo
wer
mo
tor
spee
d t
ap c
on
nec
tio
n m
ay n
ot
be
as s
ho
wn
. See
th
e In
stal
lati
on
Inst
ruct
ion
s.2)
Dis
con
nec
t al
l po
wer
bef
ore
ser
vici
ng
.3)
Tra
nsf
orm
er m
ay h
ave
a d
ual
vo
ltag
e p
rim
ary
tap
. Mat
ch t
he
tap
po
siti
on
wit
h t
he
sup
ply
vo
ltag
e u
sed
.4)
If
th
e In
tern
al w
irin
g is
rep
lace
d, u
se o
nly
105
°C c
op
per
wir
e o
f th
e sa
me
gau
ge.
TR
AN
SF
OR
ME
R
24V
BL
AC
K
WH
ITE
RE
D
GR
EY
HE
AT
ER
KIT
P
LU
G
21
BL
AC
K
RE
DE
LE
ME
NT
1
BL
AC
K
L1 L2
L3
L1
L2
L3
EL
EM
EN
T 2
EL
EM
EN
T 3
BLACK
YELLOW
RED
BL
AC
K
RE
D
BL
AC
K
YE
LL
OW
RED
EL
EM
EN
T 3
EL
EM
EN
T 2
EL
EM
EN
T 1
CO
NT
AC
TO
R
BLACK
34
56
7
RE
LA
Y
RED
OR
AN
GE
GR
EY
Fro
m in
do
or
air
han
dle
rci
rcu
it b
oar
d
RE
D
GR
EY
Fro
m in
do
or
air
han
dle
rci
rcu
it b
oar
d
To in
do
or
air
han
dle
rci
rcu
it b
oar
d
CO
M
NO
YELLOW BL
AC
K
BR
OW
N
7105670
Fig
ure
10.
Typ
ical
Sys
tem
Wir
ing
Dia
gra
m9k
w a
nd
15k
w 3
-ph
ase
elec
tric
hea
ter
kit
