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18-EB23D1-1Installer's Guide
ALL phases of this installation must comply with NATIONAL, STATE AND LOCAL CODES
IMPORTANT — This Document is customer property. Please return to service information pack and give this Installer's Guide to the homeownerupon completion of work.
Single Package Gas/Electric 13 SEERConvertible, 1½ - 5 Ton, 40 - 120 MBTUR-22/R-410A
2/4YCC3018A through YCC3060A 2/4YCX3018A through YCX3060A
WARNING: HAZARDOUS VOLTAGE - DISCONNECT POWER and DISCHARGE CAPACITORS BEFORE SERVICING
Page 2
Installer’s Guide
IMPORTANT: Read this entire manual before beginning installation procedures.
IMPORTANT: DO NOT CONNECT GAS PIPING TO THE UNITUNTIL A LINE PRESSURE TEST HAS BEEN COMPLETED.DAMAGE TO THE GAS VALVE MAY RESULT IN AN UNSAFECONDITION. THIS UNIT SHOULD NEVER BE EXPOSED TOGAS LINE PRESSURE IN EXCESS OF 13.8 INCHES WATERCOLUMN. (1/2 PSIG)
IMPORTANT: RECONNECT ALL GROUNDING DEVICES.ALL PARTS OF THIS PRODUCT CAPABLE OF CONDUCTINGELECTRICAL CURRENT ARE GROUNDED. IF GROUNDINGWIRES, SCREWS, STRAPS, CLIPS NUTS OR WASHERSUSED TO COMPLETE A PATH TO GROUND ARE REMOVEDFOR SERVICE, THEY MUST BE RETURNED TO THEIR ORIGI-NAL POSITION AND PROPERLY FASTENED.
Safety Considerations
▲WARNING: BODILY INJURY CAN RESULT FROM HIGH VOLTAGE ELECTRICAL COMPONENTS, FAST MOVING FANS, AND COMBUSTIBLE GAS. FOR PROTECTION FROM THESE INHERENT HAZARDS DURING INSTALLATION AND SERVICING, THE ELECTRICAL SUPPLY MUST BE DISCONNECTED AND THE MAIN GAS VALVE MUST BE TURNED OFF. IF OPERATING CHECKS MUST BE PERFORMED WITH THE UNIT OPERATING, IT IS THE TECHNICIANS RESPONSIBILTY TO RECOGNIZE THESE HAZARDS AND PROCEED SAFELY.
▲WARNING: NEVER USE AN OPEN FLAME TO TEST FOR GAS LEAKS: AN EXPLOSION COULD OCCUR, CAUSING INJURY OR DEATH.
WARNING: Indicates a potentially hazardous situa-tion which, if not avoided, could result in death orserious injury.
CAUTION: Indicates a potentially hazardous situa-tion which, if not avoided, may result in minor ormoderate injury. It may also be used to alert againstunsafe practices and where property-damage-onlyaccidents could occur.
The following warnings complies with the State of Californialaw, Proposition 65.
WARNING: HAZARDOUS GASSES!
Exposure to fuel substances or by products of incom-plete fuel consumption is believed by the state of Cali-fornia to cause cancer, birth defects, or other reproduc-tive harm.
PRECAUTIONARY MEASURES• Avoid breathing fiberglass dust• Use a NIOSH approved dust/mist respirator• Avoid contact with the skin or eyes. Wear long-
sleeved, loose fitting clothing, gloves, and eye protec-tion.•Wash clothes separately from other clothing, rinse
washer thoroughly.• Operations, such as sawing, blowing, tear-out, and
spraying may generate fiber concentrations requiringadditional respiratory protection. Use the appropriateNIOSH approved respirator in these situations.
FIRST AID MEASURESEye Contact: Flush eyes with water to remove
dust. If symptoms persist, seek
medical attention.
Skin Contact: Wash affected area gently with soap
and warm water after handling.
WARNING: This product containsfiberglass wool insulation! Fiberglass dust andceramic filters are believe by the state of Californiato cause cancer through inhalation. Glasswool fibersmay also cause respiratory, skin, or eye irritation.
NOTICEWarning and Cautions appear at appropriatelocations throughout this guide. Read thesecarefully.
WARNING: DO NOT OPERATE THE UNIT WITH-OUT THE EVAPORATOR FAN OR COIL ACCESS PANELS INPLACE. REINSTALL THE ACCESS PANELS AFTER PER-FORMING MAINTENANCE PROCEDURES ON THE FAN. OP-ERATING THE UNIT WITHOUT THE ACCESS PANELS PROP-ERLY INSTALLED MAY RESULT IN SEVERE PERSONAL IN-JURY OR DEATH.
NOTICE: Wear appropriate gloves, arm sleeve protectors,and eye protection when servicing or maintaining thisequipment.
Page 3
Installer’s GuideRead this manual carefully before attempting to install, operate,or perform maintenance on this unit. Installation and maintenanceshould be performed by qualified service technicians only. DoNOT use this furnace for temporary heating of buildings underconstruction.
As shipped from the factory, this unit is for use with natural gasonly. It is listed by Underwriters Laboratory. An LPG conver-sion kit is available. A high altitude installation kit of additionalorifice sizes is available. An extreme mounting kit for slabsand curbs is also available.
Model YC heating/cooling units are designed for outdoormounting with a vertical condenser discharge. They can belocated either at ground level or on a roof in accordance with localcodes or National Fuel Gas Code (ANSI-Z223.1A) LatestRevision. Since these units are designed exclusively for outdooroperation, additional flue venting systems are not required. Eachunit contains an operating charge of Refrigerant as shipped.Extreme mounting kits are available for slab (BAYEXMK002AA)or curb (BAYEXMK003AA) mountings.
The indoor fan motor speed adjustment is provided in theMaintenance section.
This guide is organized as follows:
Step 1-Inspect Shipment
Step 2-Determine Unit Clearances
Step 3-Review Location and Recommendation Information
Step 4-Unit Installation
Step 5-Unit Startup
Sequence of Operation
Maintenance
IntroductionContentsSafety Considerations 2Introduction 3Step 1-Inspect Shipment 3Step 2-Determine Unit Clearances 4Step 3-Review Location and Recommendation
Information 12Step 4-Unit Installation 13 Install Flue Hood 13 Ground Level Installation 13 Rooftop Installation -- Curb Mounting 13 Covert Horizontal Airflow to Down Airflow 13 Install Full Perimeter Roof Mounting Curb 13 Lifting and Rigging 13 Placing the Unit on the Mounting Curb 14 Rooftop Installation -- Frame Mounting 14 Ductwork Installation 17 Attaching Downflow Ductwork to Roof Curb 17 Attaching Downflow Ductwork to Roof Frame 17 Attaching Horizontal Ductwork to Unit 17 Condensate Drain Piping 17 Gas Piping Installation 18 Pipe Delivery Schedule (natural gas only) 18 Gas Pressure Set-up Precautions 18 Gas Supply Line Pressure (all fuels) 18 Verify Manifold Pressure 19 Input Check and Adjustment 19 High Altitude Installation 20 Air Filter Installation 20 Electrical Wiring 20 Electrical Connections 20 Electrical Power 21 Disconnect Switch 21 Over current Protection 21 Power Wiring 21 Control Wiring (Class II) 21 Thermostat Heat Anticipator 21Step 5-Unit Startup 21 Pre-start Quick Checklist 21 Field Wiring Diagram 22 Starting the Unit in the Cooling Mode 23 Operating Pressures 23 Voltage Check 23 Cooling Shutdown 23 Starting the Unit in Gas Heating Mode 23 Final Installation Checklist 23Sequence of Operation 24Maintenance 24 Owner Maintenance 24 Condenser Coil 24 Service Maintenance 25 Cooling Season 25 Heating Season 25 Indoor Fan Motor Speed Tap Setting 25 Manifold Pressure Check and Adjust 26 Flue Hood and Combustion Blower Cleaning 26 Status LEDs 26
Step 1—Inspect Shipment1. Check for damage after the unit is unloaded. Report promptly
to the carrier any damage found to the unit. Do not drop theunit.
Important: To prevent damage to the sides and top ofthe unit when hoisting, the use of “spreader bars” isrecommended.
2. Check the unit’s nameplate to determine if the unit is correctfor the intended application. The power supply must beadequate for both the unit and all accessories.
3. Check to be sure the refrigerant charge has been retainedduring shipment. Remove the Compressor access panel toaccess the 1/4" flare pressure taps.
4. The Flue Hood is included with the unit's literature. It isattached to the unit's side panel with two mounting screws.The factory installs the screws into the unit. During installa-tion remove the screws and use to install the Flue Hood.
5. If this unit is being installed on a curb, verify that the correctcurb is provided with the unit.
• YC~3018 through YC~3036 use the small cabinet,Model BAYCURB050A.
• YC~3042 through YC~3060 use the large cabinet,Model BAYCURB051A.
6. If the unit is being hoisted, accessory kit BAYLIFT002AA isrecommended. It includes a kit of four (4) lifting lugs andinstructions.
Page 4
Installer’s Guide
Figure 1.
Step 2—Determine Unit Clearances
YCC3018A through YCC3036A (1 of 2)
Figures 1 to 8 show the unit critical dimensions. Figures 2and 4 show the YCC clearances and Figures 6 and 8show the YCX clearances.
RETURN SUPPLY
(FIELD INSTALLED)
INLET
DUCT FLANGE
INLET
INLET
CENTER OF GRVITY (B - C)
INLET
FLUE HOOD
OUTLET
Page 5
Installer’s Guide
SUPPLY RETURN
WITH ECONOMIZER
304.8 (12)
914.4 (36)
1066.8 (42)
1066.8 (42)
(FIELD INSTALLED)FLUE HOOD
37 [81]
36 [80]
37 [81]
36 [79]
37 [81]
36 [78]
36 [80]
36 [80]
37 [81]
58 [128]
58 [127]
58 [129]
57 [125]
58 [128]
59 [130]
60 [132]
61 [133]
61 [135]
46 [102]
46 [102]
49 [107]
47 [104]
49 [107]
49 [109]
50 [111]
51 [111]
51 [113]
29 [65]
29 [64]
31 [68]
30 [66]
31 [68]
30 [65]
30 [66]
30 [67]
31 [68]
170 [375]
170 [374]
175 [385]
169 [374]
174 [385]
174 [383]
176 [389]
178 [392]
180 [397]
635 [25.0]
546.1 [21.5]
558.8 [22.0]
647.7 [25.5]
903.29[35-9/16]
635 [25.0]
635 [25.0]
635 [25.0]
635 [25.0]
647.7 [25.5]
647.7 [25.5]
647.7 [25.5]
546.1 [21.5]
558.8 [22.0]
558.8 [22.0]
558.8 [22.0]
558.8 [22.0]
558.8 [22.0]
558.8 [22.0]
Figure 2. YCC3018A through YCC3036A (2 of 2)
Page 6
Installer’s Guide
Figure 3. YCC3042A through YCC3060A (1 of 2)
RETURN SUPPLY
(FIELD INSTALLED)
INLET
DUCT FLANGE
INLET
INLET
CENTER OF GRVITY
OUTLET
INLET
FLUE HOOD
457.20 (18)(INSIDE)
Page 7
Installer’s Guide
RETURNSUPPLY
304.8 (12)
WITH ECONOMIZER
(FIELD INSTALLED)FLUE HOOD
1066.8 (42)
1066.8 (42)
914.4 (36)
45 [99]
46 [101] 62 [136]68 [150]
69 [152]
70 [154]
67 [147]
68 [149]
68 [151]
77 [171]
75 [166]
74 [163]
76 [167]
82 [181]
77 [169]
76 [167]
67 [149]
69 [151]
46 [101]
47 [104] 83 [184]
47 [103]
46 [102]
81 [179]
83 [120]
61 [134]
51 [112]
61 [134]
77 [170]
78 [171]76 [167]
77 [169]
41 [89]
41 [89]
41 [91]
45 [100]
47 [103]
45 [98]
45 [100]
46 [101]
43 [96]
44 [97]
43 [94]
43 [95]
45 [102]
668.02 [26.3] 698.5 [27.5]
711.2 [28.0]
45 [99]
51 [111]
51 [113]
52 [114]
49 [109]
50 [111]
954.10[37-9/16]
954.10[37-9/16]
1055.70 [41-9/16]
1004.90 [39-9/16]
67 [149]
214 [471]
217 [479]
214 [471]
239 [528]
243 [535]
245 [541]
235 [517]
238 [525]
241 [531]
249 [550]
252[556]
246 [542]
249 [548]
668.02 [26.3]
668.02 [26.3]
668.02 [26.3]
668.02 [26.3]
668.02 [26.3]
668.02 [26.3]
668.02 [26.3]
668.02 [26.3]
698.5 [27.5]
698.5 [27.5]
698.5 [27.5]
698.5 [27.5]
698.5 [27.5]
698.5 [27.5]
698.5 [27.5]
698.5 [27.5]
711.2 [28.0]
711.2 [28.0]
711.2 [28.0]
711.2 [28.0]
711.2 [28.0]
711.2 [28.0]
711.2 [28.0]
YCC3042A through YCC3060A (2 of 2)Figure 4
Page 8
Installer’s Guide
YCX3018A through YCX3036A (1 of 2)Figure 5
RETURN SUPPLY
(FIELD INSTALLED)
CENTER OF GRVITY
FLUE HOOD
Page 9
Installer’s Guide
SUPPLY RETURN
WITH ECONOMIZER
(FIELD INSTALLED)FLUE HOOD
304.8 (12)
914.4 (36)
1066.8 (42)
1066.8 (42)
37 [81]
36 [80]
37 [81]
36 [79]
37 [81]
36 [78]
36 [80]
36 [80]
37 [81]
58 [128]
58 [127]
58 [129]
57 [125]
58 [128]
59 [130]
60 [132]
61 [133]
61 [135]
46 [102]
46 [102]
49 [107]
47 [104]
49 [107]
49 [109]
50 [111]
51 [111]
51 [113]
29 [65]
29 [64]
31 [68]
30 [66]
31 [68]
30 [65]
30 [66]
30 [67]
31 [68]
170 [375]
170 [374]
175 [385]
169 [374]
174 [385]
174 [383]
176 [389]
178 [392]
180 [397]
635 [25.0]
546.1 [21.5]
558.8 [22.0]
647.7 [25.5]
903.29[35-9/16]
635 [25.0]
635 [25.0]
635 [25.0]
635 [25.0]
647.7 [25.5]
647.7 [25.5]
647.7 [25.5]
546.1 [21.5]
558.8 [22.0]
558.8 [22.0]
558.8 [22.0]
558.8 [22.0]
558.8 [22.0]
558.8 [22.0]
YCX3018A through YCX3036A (2 of 2)Figure 6.
Page 10
Installer’s Guide
YCX3042A through YCX3060A (1 of 2)Figure 7.
RETURN SUPPLY
(FIELD INSTALLED)
CENTER OF GRVITY
FLUE HOOD
457.20 (18)(INSIDE)
Page 11
Installer’s Guide
YCX3042A through YCX3060A (2 of 2)Figure 8.
RETURNSUPPLY
304.8 (12)
914.4 (36)
1066.8 (42)
1066.8 (42)
45 [99]
46 [101] 62 [136]68 [150]
69 [152]70 [154]
67 [147]68 [149]
68 [151]
77 [171]
75 [166]
74 [163]
76 [167]
82 [181]
77 [169]76 [167]
67 [149]
69 [151]
46 [101]47 [104] 83 [184]47 [103]
46 [102]
81 [179]
83 [120]
61 [134]
51 [112]
61 [134]
77 [170]
78 [171]76 [167]
77 [169]
41 [89]
41 [89]
41 [91]
45 [100]
47 [103]45 [98]
45 [100]
46 [101]
43 [96]
44 [97]
43 [94]
43 [95]
45 [102]
668.02 [26.3] 698.5 [27.5]
711.2 [28.0]
45 [99]
51 [111]51 [113]
52 [114]49 [109]50 [111]
954.10[37-9/16]
954.10[37-9/16]
1055.70 [41-9/16]
1004.90 [39-9/16]
67 [149]
214 [471]
217 [479]
214 [471]
239 [528]
243 [535]245 [541]
235 [517]
238 [525]
241 [531]
249 [550] 252[556]
246 [542]
249 [548]
668.02 [26.3]
668.02 [26.3]
668.02 [26.3]
668.02 [26.3]668.02 [26.3]
668.02 [26.3]
668.02 [26.3]668.02 [26.3]
698.5 [27.5]
698.5 [27.5]
698.5 [27.5]
698.5 [27.5]698.5 [27.5]
698.5 [27.5]698.5 [27.5]
698.5 [27.5]
711.2 [28.0]
711.2 [28.0]
711.2 [28.0]
711.2 [28.0]
711.2 [28.0]
711.2 [28.0]
711.2 [28.0]
Page 12
Installer’s Guide
3. The louvers above and below the flue hood in the side panelmust have adequate clearance around the air opening into thecombustion area. See Figures 2, 4, 6, or 8.
4. Examine all flue product-carrying areas of the furnace, its ventsystem, and the main burner for safe operation.
Note: If practical, install any internal accessories to the unitat the shop.
IMPORTANT: Air outlet duct must have 1" clearance to combustible material downstream from the unit.
5. Check the handling facilities to ensure the safety of personneland the unit.
6. The unit must be mounted level for proper drainage of waterthrough the drain holes in the base pan.
7. The unit should not be exposed to direct roof water runoff.
8. Flexible duct connectors must be of a flame retardantmaterial. All duct work outside of the structure must beinsulated and weatherproofed in accordance with local codes.
9. Holes through exterior walls or roof must be sealed inaccordance with local codes.
10. All fabricated outdoor ducts should be as short as possible.See Figure 9.
Step 3—Review Location and Recom-mendation Information
Note: The unit is shipped for horizontal installation.
CAUTION MUST BE TAKEN AT ALL TIMES TO AVOIDPERSONAL INJURIES AND/OR DAMAGE TO EQUIPMENT
NOTE: During heating operation, avoid supply air below 80degrees F or return air below 50 degrees F to prevent flue gascondensation.
Horizontal Airflow Units
1. Location of the unit must allow service clearance around it toensure adequate serviceability, maximum capacity, and peakoperating efficiency.
2. These units are design certified for outdoor installation. Theymay be installed directly on a slab, wood flooring, or on ClassA, B, or C roof covering material. The discharge air from thecondenser fans must be unrestricted for a minimum of 3 feetabove the unit.
2. Any reduction of the unit clearances indicated in these figuresmay result in condenser coil starvation or the recirculation ofwarm condenser air. Actual clearances, which appear to beinadequate should be reviewed with a local engineer.
3. See the unit’s nameplate for the absolute minimum clearancebetween the unit and any combustible surfaces.
1. Location of the unit must allow service clearance around it toensure adequate serviceability, maximum capacity, and peakoperating efficiency.
Note: If practical, install any internal accessories to theunit at the shop.
2. Refer to the Installation section for instruction on convert-ing the supply and return airflow covers to down airflow.
3. The field assembled Roof Mounting Curb (BAYCURB050Aor BAYCURB051A) or a field fabricated curb should be inplace before the unit is hoisted to the roof top.
The Roof Mounting Curb (frame) must be installed ona flat, level section of the roof (maximum of 1/4" perfoot pitch) and provide a level mounting surface for theunit. Also, be sure to provide sufficient height abovethe roof to prevent water from entering the unit.
4. Be sure the mounting curb spans structural members (trusses)of the roof, thereby providing sufficient support for the weight ofthe unit, the curb, the duct(s), and any factory or field installedaccessories.
5. Be sure the hole in the structure for the ducts is largeenough to accommodate the fabricated ducts and theinsulation surrounding them. See Figures 13 and 14 onpage 16.
6. These units are design certified for outdoor installation.They may be installed directly on a slab, wood flooring, oron Class A, B, or C roof covering material. The dischargeair from the condenser fans must be unrestricted for aminimum of 3 feet above the unit.
7. The louvers above and below the flue hood in the side panel musthave adequate clearance around the air opening into thecombustion area.
8. Examine all flue product-carrying areas of the furnace, itsvent system, and the main burner for safe operation.
IMPORTANT: Air outlet duct must have 1" clearance to combustible material downstream from the unit.
9. Exhaust vents or other sources of contaminated air shouldnot be near the unit’s air inlet if outside air is to beintroduced as make-up air or a ventilation feature is to beused. Contamination from exhaust vents or chimneys mayalso foul the condensor causing degraded performance.
10. Check the handling facilities to ensure the safety ofpersonnel and the unit(s).
Clearances
Refer to the Clearances section in the previous HorizontalAirflow Units section.
Down Airflow Units
Clearances
1. The recommended clearances for single-unit installations areillustrated in Figures 1 to 8.
Page 13
Installer’s GuideStep 4—Unit Installation
Note: The factory ships this unit for horizontal installation.
Install Flue Hood1. Locate the Flue Hood in the literature package.
2. Remove the two Flue Hood mounting screws from the unit. Theyare located to the right of the Power Entry connection panel.
3. Attach the Flue Hood to the unit with the two screws removed in step 2..
Ground Level InstallationTo install the unit at ground level:
1. Place the unit on a pad the size of the unit or larger. The unit mustbe mounted level for proper drainage of water through the holesin the base pan. To securely attach the unit to the slab, useextreme mounting kit, BAYEXMK002AA.
The pad must not come in contact with the structure (see Figure9.) Be sure the outdoor portion of the supply and return airducts are as short as possible.
2. The louvers above and below the Flue Hood in the sidepanel must have adequate clearance around the airopening into the combustion area.
3. Location of the unit must allow service clearance around it.Clearance of the unit must be given careful consideration. SeeFigures 1 to 8.
Note: Any reduction of the unit clearances indicated inthese illustrations may result in condenser coil starvation orthe recirculation of warm condenser air. Actual clearances,which appear to be inadequate should be reviewed with alocal engineer.
IMPORTANT: The air outlet duct must have 1" clearanceto combustible material downstream from the unit.
4. Attach the supply and return air ducts to the unit as explainedin the following Ductwork Installation section.
5. Flexible duct connectors must be of a flame retardant material.Insulate any ductwork outside of the structure with at least 2inches of insulation and weatherproof. There must be a weather-proof seal where the duct enters the structure.
Rooftop Installation -- Curb MountingConvert Horizontal Airflow to Down AirflowThe factory ships the unit for horizontal airflow. Perform thisprocedure to convert it to down airflow:
1. Remove the three (3) sheet metal screws securing the supply aircover and the four (4) sheet metal screws securing the return aircover from the base of the unit. Remove the covers from the base.See Figure 10.
2. Place the covers over the horizontal supply and return openings(painted side out). Align the screw holes, and secure using thesame screws removed in step 1.
Lifting and Rigging1. Before preparing the unit for lifting, check the unit dimension
drawings for center of gravity for lifting safety (Figures 1 to 8).Because of placement of internal components, the unit’s weightmay be unevenly distributed. Approximate unit weights arealso provided in the unit drawings.
Note: Unit rigging and hoisting requires accessory kitBAYLIFT002AA. It includes a kit of four (4) lifting lugs. SeeFigure 11 insert B.
Figure 9. Typical Ground Level Applications
6. Do not expose the unit to direct roof water runoff.
7. Seal all holes through exterior walls in accordance with localcodes.
8. Continue with the following installation sections to completethe installation: Ductwork, Gas Piping, Filter, and ElectricalWiring.
Install Full Perimeter Roof Mounting Curb
1. Verify that the roof mounting curb is correct for the unit. There are two Installer's Guides depending on the cabinet sizes: • YC~3018 through YC~3036 use the small cabinet, Model BAYCURB050A. • YC~3042 through YC~3060 use the large cabinet, Model BAYCURB051A.
2. Assemble and install the curb following the instructions in the appropriate Installer's Guide.
SHIELDISOLATORS
Note: Use the extrememounting kit, BAYEXMK002AA,to secure the unit to the slab.
Page 14
Installer’s Guide
9. The unit should not be exposed to direct roof water runoff.
10. Flexible duct connectors must be of a flame retardant material.All duct work outside of the structure must be insulated andweatherproofed in accordance with local codes.
11. Access and service clearances for the unit must be givencareful consideration when locating the duct entrance open-ings. Figures 1 to 8 provides unit dimensions.
12. Continue with the following installation sections to completethe installation: Ductwork, Gas Piping, Filter, and ElectricalWiring.
Rooftop Installation -- Frame MountingFor roof top applications using a field fabricated frame and ducts,use the following procedure:
1. Locate and secure the frame to the roof by bolting or welding.Add flashing as required. Flashing must conform to localbuilding codes.
2. Prepare the hole in the roof in advance of installing the unit.
3. Secure the horizontal or down airflow ducts to the roof. Referto the previous Convert from Horizontal Airflow to Down Airflowsection if conversion is needed.
4. All fabricated outdoor ducts should be as short as possible.
5. Place the unit on the frame. Refer to Figures 13 or 14.
6. The unit must be mounted level for proper drainage of waterthrough the holes in the base pan.
7. Secure the unit to the frame.
8. Insulate any ductwork outside of the structure with at least two(2) inches of insulation and then weatherproof. There must bea weatherproof seal where the duct enters the structure.
Placing the Unit on the Mounting Curb 1. The unit is designed with a perimeter drip lip that is lower than
the unit base pan, see Figure 11, inset A.
2. Position the unit drip lip down over and in contact with theoutside corner of the curb, as illustrated in Figure 12, insert A.Continue to lower the unit on top of the curb, with the unit driplip astraddle, and in contact with, both the end and side rail ofthe curb. The unit should now rest on top of the curb.
3. Take the two (2) hold-down brackets shipped with the curb andsecure the unit to the curb as illustrated in Figure 12, insert A.
2. Insert the four lifting lugs in the openings provided in the driplip on each end of the unit. See Figure 11 insert B. A tap or jerkto the lug will overcome the interference that arises due to thedimple on the lug.
3. Before hoisting the unit, be sure that the proper method ofrigging is used with straps or slings and spreader bars forprotection during lifting. Always test-lift the unit to determine theexact unit balance and stability before hoisting it to the instal-lation location.
Important: Do not lift the unit without test lifting for balanceand rigging. Do not lift the unit in windy conditions or abovepersonnel. Do not lift the unit by attaching clevis, hooks,pins, or bolts to the unit casing, casing hardware, cornerlugs, angles, tabs, or flanges. Failure to observe thesewarnings may result in equipment damage.
4. When the curb and air ducts have been properly installed, theunit is ready to be hoisted to the roof and set in position.
Important: “Spreader Bars” are recommended when hoist-ing the unit.
Important: The unit must be lowered into position. The P.V.C.rubber tape on the curb flange permits the unit to be repo-sitioned if required without destroying the P.V.C. rubberseals affixed to the mounting curb.
Use the extreme mounting kit, BAYEXMK003AA, to add additionalhold down strength to the mounting.
NOTE: The ductwork is installed as part of the curb installation.Do not attach ductwork to the unit and lower the unit withductwork onto the curb.
Figure 10. Converting Horizontal to Down Airflow
Page 15
Installer’s Guide
Figure 11. Lifting and Rigging
Figure 12. Placing Unit on Curb
Note: Use the extrememounting kit, BAYEXMK003AA,to additional holding strength tothe unit to curb mounting.
EXISTINGSHEET METAL
SCREW
HOLD-DOWNBRACKET WITH
CURB
FLANGE OFCURB
“A”
Page 16
Installer’s Guide
Figure 14.Typical Rooftop Down Airflow Application with Frame
Figure 13. Typical Rooftop Horizontal Airflow Application with Frame
Page 17
Installer’s Guide
Attaching Horizontal Ductwork to UnitAll conditioned air ductwork should be insulated to minimizeheating and cooling duct losses. Use a minimum of two (2) inchesof insulation with a vapor barrier. The outside ductwork must beweatherproofed between the unit and the building. See Figure 16.
When attaching ductwork to a horizontal unit, provide a flexiblewatertight connection to prevent noise transmission from the unit tothe ducts. The flexible connection must be indoors and made outof heavy canvas.
Note: Do not draw the canvas taut between the solid ducts.
Attaching Downflow Ductwork to Roof CurbSupply and return air flanges are provided on the roof curb for easyduct installation. All ductwork must be run and attached to the curbbefore the unit is set into place.
Attaching Downflow Ductwork to Roof FrameFollow these guidelines for ductwork construction:
Connections to the unit should be made with three inch canvasconnectors to minimize noise and vibration transmission.
Elbows with turning vanes or splitters are recommended to mini-mize air noise and resistance.
The first elbow in the ductwork leaving the unit should be no closerthan two (2) feet from the unit, to minimize noise and resistance.
To prevent leaking, do not attach the ductwork to the bottom of theunit base; refer to the bottom example in Figure 15.
Condensate Drain PipingA 3/4-inch female NPT condensate drain connection is provided onthe evaporator access panel end of the unit. Provide a trap and fillit with water before starting the unit to avoid air from being drawnthrough. Follow local codes and standard piping practices whenrunning the drain line. Pitch the line downward away from the unit.Avoid long horizontal runs. See Figure 17.
Note: Do not use reducing fittings in the drain lines.
The condensate drain must be:
● Made of 3/4" pipe size.
● Pitched 1/4" per foot to provide free drainage to convenient drainsystem.
● Trapped.
● Must not be connected to a closed drain system unless the trapis properly vented.
Ductwork Installation
Figure 17. Typical Condensate Drain Piping
FIELD DUCT
UNIT DUCTFLANGE
UNIT BASE
AIR PROOFTHIS SEAM
FIELD DUCT
UNIT DUCTFLANGE UNIT BASE
AIR PROOFTHIS SEAM
FIELDDUCT
UNIT DUCT FLANGE
UNIT BASE
AIR PROOFTHIS SEAM
FIELD DUCT
UNIT DUCTFLANGE
UNIT BASE
NOT RECOMMENDED
WATERPROOF SEAMWITH BUTYL OR
SILICONE
DOWNFLOWFigure 15. Down Airflow Ductwork
Figure 16. Horizontal Airflow Ductwork
FIELD DUCT
UNIT EXTERIOR
WEATHERPROOFTHIS SEAM
FIELD DUCT
UNIT EXTERIOR
WEATHERPROOFTHIS SEAM
3/4" PVC OR COPPERTUBING AND FITTINGS
1-1/2" MIN.
1-1/2" MIN.
Page 18
Installer’s Guide
IMPORTANT: Before making the gas pipe connection, seri-ously consider providing the required clearance necessaryto remove the access panels on the unit (for example, heatexchange side access panel).
Note: In the absence of local codes, the installation must conformwith American National Standard--Z223.1--National Fuel GasCode, Latest Revision.
The available gas supply must agree with the required gas supplymarked on the unit nameplate. The Minimum permissible gassupply pressure for the purpose of input adjustment must be at least5.0" W. C. (inches Water Column) for natural gas and 11' W.C. forpropane.
Pipe Delivery Schedule (Natural Gas Only)
Note: The following procedure and tables below apply to NaturalGas only.
1. Obtain from the gas company the heating value and specificgravity of the gas delivered.
2. Determine the exact length of pipe needed.
3. Read the BTUH input nameplate on the furnace.
4. Use the multiplier opposite the specific gravity of the gas givenin Table 1 and insert in the following CHF formula:
Table 1
CFH =Furnace Input in BTUH
Gas Heat Content in BTU/Cu. Ft. X Multiplier
This will give the factor for columns 2 through 7 in Table 2.
5. Using Table 2, select the pipe length nearest to yours.
6. Follow this line down to the exact CFH found in Step 4 aboveor the next highest value.
7. Read across to the left of this column for the required pipe sizediameter.
Note: If this is an propane application, consult your propanesupplier for pipe sizes and deliveries.
Gas Pressure Set-Up Precautions
IMPORTANT: The furnace and its individual shut-off valvemust be disconnected from the gas supply piping systemduring any pressure testing of that system at test pressuresexceeding 1/2 psig (3.48 kPa).
The furnace must be isolated from the gas supply piping systemby closing its individual manual shut-off valve during any pressuretesting of the gas supply piping system at test pressures less thanor equal to 1/2 psig (3.48 kPa).
Gas Supply Line Pressure (All Fuels)Before connecting the unit to the gas supply line, be sure todetermine the gas pressure in the line.
If the gas supply pressure is excessive (above 13.8 inches watercolumn or 1/2 psig), install a pressure regulator either at the supplysource or in the branch circuit serving the unit. Once the regulatoris installed, set it to provide a maximum pressure of 13.8" W.C. tothe gas valve for natural gas with a minimum supply pressure of5.0" W.C. A maximum supply pressure of 13.8" W.C. to the gasvalve for propane with a minimum pressure of 11.0" W.C.
Note: Maximum pressure to the gas valve for natural gas is13.8" W.C. Minimum pressure is 5.0" W.C. Maximum pressureto the gas valve for propane is 13.8"W.C. Minimum pressure tothe gas valve is 11.0" W.C.
If the supply line pressure is below the minimum supply pressureindicated on the unit nameplate, contact the gas supply company.
Follow these steps to complete the installation of the unit gaspiping. See Figure 18.
1. Install a tapped, Style A (1/8-inch NPT tap) shut-off gas cockat the end of the gas supply line near the unit. Be sure thetapped gas cock is downstream of the pressure regulator, ifused.
SPECIFICGRAVITY MULTIPIER
MULTIPIERS TO BE USEDWHEN THE SPECIFIC
GRAVITY OF THE GAS ISOTHER THAN 0.60
.50 1.10
.55 1.04
.60 1.00
.65 .962
▲WARNING: NEVER USE AN OPEN FLAME TO TEST FOR GAS LEAKS: AN EXPLOSION COULD OCCUR, CAUSING INJURY OR DEATH.
Gas Piping Installation
Figure 18
NATURAL GAS ONLY
TABLE OF CUBIC FEET PER HOUR OF GASFOR VARIOUS PIPE SIZES AND LENGTHS
PIPESIZE(inch)
LENGTH OF PIPE (feet)
10 20 30 40 50 60 70
1/2 132 92 73 63 56 50 46
3/4 278 190 152 130 115 105 96
1 520 350 285 245 215 195 180
1-1/4 1050 730 590 520 440 400 370
THIS TABLE IS BASED ON PRESSURE DROP OF 0.3 INCH W.C. AND 0.6 SP.GR. GAS
Table 2. Natural Gas Only
DEALER INSTALLEDGROUND UNION
1/8" N.P.T.PLUGGEDACCESS FOR TEST
GAUGE CONNECTION
FROMGAS SUPPLY
FIELD SUPPLIED MAINGAS VALVE, MUST BE
INSTALLED BY DEALEROUTSIDE UNIT.
UNIT
TO MAINCONTROL
VALVE
6"MIN
DRIP LEG(6" MIN)
Page 19
Installer’s GuideNote: The shut-off gas cock must be installed outside ofthe unit and should meet the specifications of all appli-cable national and local codes.
2. Install a ground union joint downstream of the shut-offcock. This joint must also be installed outside of the unit.
3. Install a drip leg at least six (6) inches in depth next to theunion as shown in Figure 18. This drip leg is required tocollect any sediment that may be deposited in the line.
4. Before connecting the piping circuit to the unit, bleed theair from the supply line. Then cap or plug the line and testthe pressure at the tapped shut-off cock. The pressurereading should not exceed 13.8 inches water column.
5. Using an appropriate backup wrench on the gas valveinlet boss, connect the gas piping to the unit. Check thecompleted piping for leaks using a soap and water solu-tion or the equivalent.
6. After installation of the gas pipe in the unit, the pipe chaseopening should be closed with the filler/barrier plugprovided.
Verify Manifold PressureCheck the manifold pressure at the unit gas valve. Do notexceed the recommended pressure shown on the unit name-plate. See Figure 19 for connections. Refer to ManifoldPressure Check and Adjust in the following Step 5-UnitStartup section if adjustment is needed.
Figure 19. Burner and Valve
Input Check and Adjustment1. Make sure all gas appliances are off except the furnace.
2. Clock the gas meter with the furnace operating (determine thedial rating of the meter) for one revolution.
3. Match the “Sec” column in the Gas Flow (in cfh) Table 3 with thetime clocked.
4. Read the “Flow” column opposite the number of secondsclocked.
5. Table 3 lists values for a 2 cubic foot dial. For 1, 1/2, or 5 Cu. Ft.dials use the following conversions:
1 Cu. Ft. Dial Gas Flow CFH = Chart Flow Reading / 21/2 Cu Ft. Dial Gas Flow CFH = Chart Flow Reading / 45 Cu. Ft. Dial Gas Flow CFH = 10X Chart Flow Reading / 4
6. Multiply the final figure by the heating value of the gas obtainedfrom the utility company and compare to the nameplate rating.This must not exceed the nameplate rating.
7. Changes can be made by adjusting the manifold pressure.
a. Attach a manifold pressure gauge to the Outlet Pressure Tap.
b. Remove the cover screw on top of the gas valve to accessthe manifold pressure adjustment screw. See Figure 19.
c. Turn the adjustment screw in to increase the gas flow rate,and out to decrease the gas flow rate using a 3/32" hexwrench or flat-head screwdriver.
(3 Burners)REF. VIEW
GAS VALVE
ORIFICE
BURNER
MANIFOLD
REF. VIEWOUTLETPRESSURE TAP
VENT POST
REGULATOR COVER SCREW(ADJ. SCREW BENEATHTHIS SCREW)
"ON-OFFSWITCH
INLETPRESSURETAP
(GAS VALVE)
MANUAL
Note: For manifold pressures and orifice sizes for gas withother BTU ratings, contact the local gas utility. Manifoldpressure should be 3.5 inches water column (+0.1). Inputfor natural gas must not exceed the value shown on the ratingplate.
Page 20
Installer’s GuideAir Filter InstallationThe YC heating/cooling unit requires an air filter. The basic unitdoes not have a filter in it. However, a filter frame accessory isoffered that will allow the installation of a filter within the unit.
Otherwise a filter rack must be installed by the installer in the returnduct work.
Affix the filter label supplied with the unit adjacent to the filter area.Refer to Table 6 to determine filter size.
*Filters must be installed in the return air system. The above squarefootages are based on 300 F.P.M. face velocity. If permanent filters areused, size per mfg. Recommendation with clear resistance of 0.05" WC.
TINULANIMON
MFC*RETLIF
)tFqS(EZIS
RETLIFECNATSISER
).C.W"(
A8103~CY 006 00.2 80.0A4203~CY 008 76.2 80.0A0303~CY 0001 33.3 80.0A6303~CY 0021 00.4 80.0A2403~CY 0041 76.4 80.0A8403~CY 0061 33.5 80.0A0603~CY 0002 76.6 80.0
Table 3. Gas Flow in Cubic Feet Per Hour2 Cubic Foot Dial
High Altitude InstallationInput ratings (BTUH) of these furnaces are based on sea leveloperation and should not be changed at elevations up to 2000 ft.If the unit installation is from 2000 to 8000 feet elevation, thenchange the burner orifices to the size listed in Table 4. Refer to Table5 for orifice part numbers.
Table 4. High Altitude Orifice Sizes
Table 6. Determine Filter Size
Electrical ConnectionsElectrical wiring and grounding must be installed in accordancewith local codes or, in the absence of local codes, with the NationalElectrical Code ANSI/NFPA 70, Latest Revision.
Electrical WiringNote: This unit is factory wired for 230V. See wiring diagramfor 208V conversion.
Figure 20. Power Wiring
Notes: For branch circuit wiring (main power supply to unitdisconnect), determine wire size for the length of run using thecircuit ampacity found on the unit nameplate and the N.E.C.
For more than 3 conductors in a raceway or cable, see theN.E.C. for derating the ampacity of each conductor.
Run power supplyLines through weather-tight conduit andsecure to unit withstrain relief
.ceS wolF .ceS wolF .ceS wolF .ceS wolF
8 009 92 842 05 441 28 88
9 008 03 042 15 141 48 68
01 027 13 232 25 831 68 48
11 556 23 522 35 631 88 28
21 006 33 812 45 331 09 08
31 555 43 212 55 131 29 87
41 415 53 602 65 921 49 67
51 084 63 002 75 621 69 57
61 054 73 591 85 421 89 37
71 424 83 981 95 221 001 27
81 004 93 581 06 021 401 96
91 973 04 081 26 611 801 76
02 063 14 671 46 211 211 46
12 343 24 271 66 901 611 26
22 723 34 761 86 601 021 06
32 313 44 461 07 301 421 85
42 003 54 061 27 001 821 65
52 882 64 751 47 79 231 45
62 772 74 351 67 59 631 35
72 762 84 051 87 29 041 15
82 752 94 741 08 09 441 05
Table 5. Orifice Part Numbers
eziSllirD rebmuNtraP eziSllirD rebmuNtraP
233343536373839304
70310FRO43310FRO53310FRO70410FRO80410FRO60410FRO60310FRO90410FRO63310FRO
1424940515253545
31410FRO01410FRO33310FRO23310FRO63310FRO13310FRO11410FRO21410FRO
ecifirOllirDtsiwT
fieziSdellatsnI
aeStaleveL
leveLaeSevobAedutitlAdna
noitavelEtahtrofderiuqeRegnahCecifirO
0002 0003 0004 0005 0006 0007 0008
2333739425
3353830525
4353930535
5363930535
5363041535
6373141535
6383241535
7383242545
4-FelbaT-edoCsaGleuFlanoitaNmorF
Page 21
Installer’s GuideElectrical PowerIt is important that proper electrical power be available for the unit.Voltage variation should remain within the limits stamped on theunit nameplate.Disconnect SwitchProvide an approved weatherproof disconnect within close prox-imity and within sight of the unit.
Over Current ProtectionThe branch circuit feeding the unit must be protected as shown onthe unit's rating plate.
Power WiringThe power supply lines must be run in weather-tight conduit to thedisconnect and into the side of the unit control box. Provide strainrelief for all conduit with suitable connectors.
Provide flexible conduit supports whenever vibration transmissionmay cause a noise problem within the building structure.
1. Remove the Control/Heat access panel. Pass the powerwires through the Power Entry hole in the end of the unit.See Figure 20.
2. Connect the high voltage wires to the appropriate contactorterminals. Single phase units use a two (2) pole contactorand three phase units use three (3) pole contactor. Connectthe ground to the ground lug on the chassis. See Figure 21.Be sure all connections are tight.
GROUNDING: THE UNIT MUST BE ELECTRICALLYGROUNDED IN ACCORDANCE WITH LOCAL CODES ORTHE NATIONAL ELECTRIC CODE.
Note: Unit must be grounded for ignitor to operate properly. Gaspipe to unit is not an adequate ground. Ground the unit internallyas provided. See wiring diagram for location in Figure 22.
Control Wiring (Class II)Low voltage control wiring should not be run in conduit with powerwiring unless Class 1 wire of proper voltage rating is used. Routethe thermostat cable or equivalent single leads of No. 18 AWGcolored wire from the thermostat subbase terminals through therubber grommet on the unit. See Figures 2, 4, 6, or 8 for the controlentry (24V Entry) location. Make connections as shown on the unitwiring diagram and in Figure 22.
Do not short thermostat wires since this will damage the controltransformer.
Table 6. Thermostat Wire Size and Maximum Length
Thermostat Heat AnticipatorSet the heat anticipator of the thermostat to equal the amperagedraw of the gas valve
IMPORTANT: Upon completion of wiring, check all electricalconnections, including factory wiring within the unit.
Make sure all connections are tight. Replace and secure allelectrical box covers and access panels before leaving the unit orturning on the power to the unit.
Pre-Start Quick Checklist
Is the unit properly located and level with the proper clearance?See Figures 1 to 8. See Step 2-Review Location and Clearanceson page 4.
Is the duct work correctly sized, run, taped, insulated, and weatherproofed with proper unit arrangement? See DuctworkInstallation section on page 17.
Is the condensate line properly sized, run, trapped, and pitched?See Condensate Drain Piping section on page 17.
Is the gas piping correctly sized, run, trapped, and purged ofair? See Gas Piping Installation section on page 18.
Is the filter of the correct size and quantity? Is it clean and in place?See Air Filter Installation section on page 20.
Is the wiring properly sized and run according to the unit wiringdiagram? See Electrical Wiring section on page 20 and 21.
Are all the wiring connections, including those in the unit, tight?See Electrical Wiring section on page 20 and 21.
Has the unit been properly grounded and fused with therecommended fuse size? See Electrical Wiring section onpage 20 and 21.
Is the thermostat well located, level, correctly wired, and setfor the proper heat anticipation? See Electrical Wiring sectionon page 20 and 21.
Have the air conditioning systems been checked at the serviceports for charge and leak tested if necessary?
Does the condenser fan and indoor blower turn free withoutrubbing, and are they tight on the shafts?
Has the indoor blower speed been determined and the properspeed been set? To adjust the fan, see the Indoor Fan MotorSpeed Tap Setting section on page 25.
Has all work been done in accordance with applicable localand national codes?
Are all covers and access panels in place to prevent air loss andsafety hazards?
Step 5—Unit Startup
Refer to Table 6 for recommended wire sizes and lengths forinstalling the unit thermostat. The total resistance of these lowvoltage wires must not exceed one (1) ohm. Any resistance inexcess of 1 ohm may cause the control to malfunction because ofthe excessive voltage drop.
Contactor
Unit Ground Lug
Figure 21. Power Connections
eziSeriW htgneLmumixaM81 5761 52141 002
Page 22
Installer’s Guide
Figure 22. YC Field Wiring Diagram
C 757192i2
BGY
W1W2R
COMMONFANCOMPRESSORHEAT FIRST STAGEHEAT SECOND STAGE24V
UNIT CONTROL BOX
GROUNDWIRE
3 PHPOWERUNITNOTE 1
1 PHPOWER
BGY
W1W2R
COMMONFANCOMPRESSORHEAT FIRST STAGEHEAT SECOND STAGE24V
B
G
Y
W1W2R
(GR)
(WH)(WH)
(GR)
(WH)(WH)
(GR)
(WH)(WH)
Field Wiring Diagram
Page 23
Installer’s GuideStarting the Unit in Cooling Mode
CAUTION: Before starting the system on the cooling cycle,turn the thermostat switch to OFF and close the unit disconnectswitch. This is a precaution against foaming at startup whichcould damage the compressor bearings.
Note: See the section on “Sequence of Operation” for adescription of the cooling operating sequence.
To start the unit in the cooling mode, set the thermostat systemswitch to COOL and move the thermostat COOL indicator to a settingbelow room temperature. The condenser fan motor, compressorand evaporator fan motor will operate automatically.
Operating Pressure ChecksAfter the unit has operated in the cooling mode for a short period oftime, install pressure gauges on the gauge ports of the dischargeand suction line valves (behind the Compressor access panel).Check the suction and discharge pressures and compare them tothe normal operating pressures provided in the unit’s SERVICEFACTS.
Note: Do not use the pressures from the unit's SERVICE FACTSto determine the unit refrigerant charge. The correct charge isshown on the unit nameplate. To charge the system accurately,weigh in the charge according to the unit nameplate.
Voltage Check
With the compressor operating, check the line voltage at the unit(contactor is located behind the Control/Heat access panel). Thevoltage should be within the range shown on the unit nameplate.If low voltage is encountered, check the size and length of the supplyline from the main disconnect to the unit. The line may be undersizedfor the length of the run.
Cooling Shut DownAt the thermostat, place the system selector to the OFF position orreset the thermostat to a setting above room temperature.
IMPORTANT: De-energize the main power disconnect ONLYwhen servicing the unit. Power may be required to keep the heatpump compressor warm and to boil off refrigerant in the compres-sor.
Starting the Unit in Gas Heating ModeNote: See the section on “Sequence of Operation” for a descrip-tion of the Heating operating sequence.
These units are equipped with a solid-state ignition control thatlights the burners each time the thermostat calls for heat. Theburners are extinguished during the OFF cycle. To start the gasheating section of the unit:
1. Check that all grills and registers are open and all unit accesspanels are closed before start-up.
2. Purge the gas supply line of air by opening the union ahead(upstream) of the unit. When the odor of gas is detected,retighten the union and wait five (5) minutes before proceeding.
3. Be sure the thermostat is at its lowest setting and the power tothe unit is off.
a. Turn the main shut-off valve on the gas supply line to ON.
b. Turn or switch the manual valve on the combination gasvalve to the ON position.
5. As the thermostat calls for heat, the system cycles as follows:
a. The combustion blower is energized.
b. The pressure switch is closed.
c. The gas valve opens and the ignitor lights the burner.
d. Cycle the thermostat on and off a few times to check out thecontrol system and burner operation characteristics.
Note: For manifold pressures and orifice sizes for gas withother BTU ratings, contact the local gas utility. Manifoldpressure should be 3.5 inches w.c. (+0.1). Inputmust not exceed the value shown on the rating plate.
e. With the burner operating, check the manifold pressure with a manometer.
6. Do not exceed recommended pressures. If the manifoldpressure needs adjustment, refer to Manifold Pressure Checkand Adjust in the Maintenance section. With the burnersoperating, check the manifold pressure with a manometer.
7. If necessary, adjust the unit to obtain an air temperature risewith that specified on the unit nameplate. To adjust, refer tothe Indoor Fan Motor Speed Adjustment in the Maintenancesection.
Note: Blue smoke produced by the heat exchanger duringthe initial burner firing is caused by a thin film of oil on thesurface of the heat exchanger. This oil will burn off quickly.
8. Set the thermostat at the desired temperature setting and theunit will function automatically.
Does the unit run and operate as described in the section on“Sequence of Operation” in response to the room thermostat?
Are the condenser fan and indoor blower operating correctlywith proper rotation and without undue noise?
Is the compressor operating correctly and has the system beenchecked with a charging chart?
Has the voltage and running current been checked to determine if it is within limits?
Has the thermostat been checked for calibration and the airdischarge grilles adjusted to balance the system?
Final Installation Checklist
Has the ductwork been checked for air leaks andcondensation?
Has the furnace manifold pressure been checked andadjusted if necessary?
Has the heating air temperature rise been checked?
Has the unit been checked for tubing and sheet metal rattles?Are there any other unusual noises to be checked?
Are all covers and panels in place and properly fastened?
Has the owner been instructed on the proper operation andmaintenance of the unit? Be sure to leave this manual with theowner.
4. Be sure the burner compartment access panel is in place.
a. Turn on the electrical power to the unit.
b. Turn the thermostat to the highest setting in the heating cycle.
Page 24
Installer’s GuideOperation of the unit heating or cooling cycles is controlled bythe setting of the system switch on the room thermostat. Oncethe system switch is placed either in the “HEAT” or “COOL”position, unit operation is automatic. A fan switch on thethermostat also provides for continuous operation of the indoorfan when desired. The fan switch “ON” position providescontinuous operation while the “AUTO” position providesoperation during the heating or cooling cycles.
Heating CycleThermostat call for heat(R) and (W) thermostat contacts close signaling the controlmodule (IGN) to run its self-check routine. After the control hasverified that the pressure switch (PS) contacts are open, thelimit switch (TCO) contacts are closed, and the flame rollout(RO) switch is closed, the induced draft blower (CFM) will beenergized.
After the induced draft blower (CFM) has come up to speed, thecontrol will verify that the pressure switch (PS) contacts areclosed and run the induced draft blower for a 20 secondprepurge. The gas valve (GV) is energized to permit gas flowand the spark ignitor (IP) is energized. The flame detector (FD)confirms that ignition has been achieved within the 7 secondtrial period.
As the flame detector confirms that ignition has been achievedthe delay to the indoor-fan-on period begins timing and afterapproximately 45 seconds, the indoor blower motor (IDM) willbe energized and will continue to run during the heating cycle.
Thermostat satisfied:(R) and (W) contacts open signaling the control module toclose the gas valve and de-energize the induced draftblower after approximately 5 seconds postpurge. The indoorblower motor will continue to operate at the current speedfor 60 or 90 seconds (field selectable) after the flames areextinguished.
Sequence of Operation
Safety SequencesThis product is equipped with safety devices to protect againstabnormal conditions.
The temperature limit switch (TCO) is located on the blowerbarrier, and can be accessed through the blower compartment.This automatic reset device protects against excessive leavingair temperature. If this device opens, the gas valve is immedi-ately closed and will not permit operation until the limit switchcloses.
The rollout switch (RO) is located in the gas compartment nearthe inlet of the burners. This is a manual reset device designedto protect against any form of flame rollout. If this device isopened the gas valve is immediately de-energized and thecontrol (IGN) will lockout the system. The rollout switch (RO)must be reset before operation is allowed to continue.
The pressure switch (PS) is located in the upper right side ofthe gas compartment. This automatic device assures ad-equate combustion air pressure. If pressure against theinduced draft blower outlet becomes excessive, the pressureswitch will react and shut off the gas valve, until acceptablecombustion pressure is again available.
If the control (IGN) does not sense flame within the first trial forignition period, the gas valve will be de-energized. The control(IGN) will initiate a 60 seconds interpurge. Following theinterpurge, the control will perform a second ignition attempt.If the second try is not successful, the control will start another60 second interpurge. After the interpurge, a third attempt willbe tried. If the third try is not successful, the control will lockout.
Owner MaintenanceSome of the periodic maintenance functions of the YC unit canbe performed by the owner; this includes replacing the dispos-able or cleaning the permanent air filters, cleaning the unitcabinet, cleaning the condenser coil, and conducting a generalunit inspection on a regular basis.
FiltersWhen the system is in constant operation, inspect the filtersat least once each month.
If you have disposable-type filters, replace them with newfilters of the same type and size. Do not attempt to cleandisposable filters.
Permanent-type filters can be cleaned by washing them witha mild detergent and water. Make sure that the filters arethoroughly dry before reinstalling them in the unit (or ductsystem).
Note: It may be necessary to replace permanent filtersannually if washing fails to clean the filter or if the filtershows signs of deterioration. Be sure to use the same typeand size as was originally installed.
Condenser CoilUnfiltered air circulates through the unit's condenser coil andcan cause the coil’s surface to become clogged with dust anddirt. To clean the coil, flush with low pressure water from theinside out, such as using a garden hose with the nozzleremoved.
Be sure to keep all vegetation away from the condenser coilarea.
Maintenance
▲WARNING: TO PREVENT AN EXPLOSION OR POSSIBLE INJURY, DEATH AND EQUIPMENT DAMAGE, DO NOT STORE COMBUSTIBLE MATERIALS, GASOLINE OR OTHER FLAMMABLE VAPORS OR LIQUIDS NEAR THE UNIT.
If loss of flame occurs during a heating cycle, the control (IGN)will close the gas valve and cycle through the ignition trial asstated above.
If control lock out occurs, the control (IGN) will retry a completeignition sequence in 1 hour.
The control (IGN) can be reset by removing power to the unitor by turning the thermostat from “ON” to “OFF" for approxi-mately three seconds, then back “ON.”
Cooling CycleWith the room thermostat system switch in the “COOLING”position and the fan switch in the “AUTO” position, thecompressor contactor (CC) and the indoor fan motor (IDM) areenergized.
The energized compressor contactor (CC) completes thecircuit to the compressor (CPR) and a secondary circuit to theoutdoor fan motor (ODM). If the compressor safety controls areclosed, the compressor (CPR) will operate with the outdoor fanmotor (ODM). The indoor fan motor (IDM) will operate. Thethermostat will continue to cycle the compressor and fans tomaintain the desired temperature.
With the thermostat fan switch in the “ON” position, the indoorfan motor (IDM) will continue to run regardless of compressorand condenser fan operation.
Page 25
Installer’s GuideService MaintenanceService maintenance should be performed by qualified servicepersonnel.
Cooling SeasonTo keep the unit operating safely and efficiently, the manufac-turer recommends that a qualified servicer check the entiresystem at least once each year or sooner if needed. Theserviceman should examine these areas of the YC unit:
● filters (for cleaning or replacement)
● motors and drive system components
● economizer gaskets (for possible replacement)
● safety controls (for mechanical cleaning)
● electrical components and wiring (for possible replacementand connection tightness)
● condensate drain (for proper sealing and cleaning)
● unit duct connections (to see that they are physically soundand sealed to the unit casing)
● unit mounting support (for structural integrity)
● the unit (for obvious unit deterioration)
Heating SeasonComplete the following unit inspections and service routinesdescribed at the beginning of each heating season.
● Visually inspect the unit to ensure that the airflow requiredfor combustion and condenser coil is not obstructed fromthe unit.
● Inspect the control panel wiring to verify that all electricalconnections are tight and that the wire insulation is intact.
● Check the operation of the gas ignition system as follows:Turn off the gas supply with the unit operating to verify thatthe gas valve closes and that a reignition cycle is initiatedby the unit.
● Visually inspect the inside of the burners and the burnerports for deposit buildup and corrosion. Wipe and brush theinside of the burner and the burner ports and then clean witha dry cloth. If the deposit buildup or corrosion is excessive,replace the burners.
Indoor Fan Motor (IDM) Speed Tap Setting
The 208/230 and 460 Volt units are factory set to high speed withone exception. The YC*3030 is factory set to low speed.
208/230 Volt Motor Tap Settings (Figure 23)
High speed setting: On the IGN board:
1. Connect the "RD" wire to the "PARK" terminal.
2. Connect the (IDM) PR wire to the "BLOWER LOAD" terminal.
Low speed setting: On the IGN board:
1. Connect the "RD" wire to the "BLOWER LOAD" terminal.
2. Connect the (IDM) PR wire to the "PARK" terminal.
460 Volt Motor Tap Settings (Figure 24)
High speed setting (460V):
1. At the "FTBA", connect the "PR" wire from the IGN board to the "HI" (B) terminal.
2. Connect the "PR" wire from the "HI" (B) terminal on the "FTBA" to the "H" terminal on the IDM.
3. Connect the Orange wire on the IDM to the "P" terminal on the IDM.
Figure 23. 208/230 Volt Speed Taps
LOADBLOWER
LOADINDUCER
YL
(CC1) RD
RD
(IDM) RD
PARKIN
IN( CC1) RD
LOADBLOWER
LOADINDUCER
YL
(CC1) RD
PR
(IDM) PR
PARKIN
IN( CC1) RD
Hi Speed TapSetting
Low Speed TapSetting
Low speed setting (460V):
1. At the "FTBA", connect the "PR" wire from the IGN board to the "LOW" (D) terminal.
2. Connect the "PR" wire from the "HI" (B) terminal on the "FTBA" to the "P" terminal on the IDM.
3. Connect the Orange wire on the IDM to the "H" terminal on the IDM.
(IGN) PR
P
HL
IDM
BK
HI
LOW RD
PR
ORANGE
YELLOW
BLACK
(IGN) PRP
HL
IDM
BK
HI
LOWRD
PR
ORANGE
YELLOW
BLACK
B
B
D
D
C
C
Figure 24. 460 Volt Speed Taps
Hi Speed Tap Setting
Low Speed Tap Setting
Page 26
Installer’s Guide
Table 7. IGN LED Diagnostic Indicators *
Status LEDsIGN Board Diagnostic Codes
There are two LEDs on the IGN board that provide status anddiagnostic information. Refer to Table 7 for a description of theLED codes.
* LEDs are located on the IGN board, which is inside the Control/Heat compartment
sedoChsalFsrotacidnIcitsongaiDNGI
DELsutatS DELtropetiL
ffOsuounitnoC draoBdaBrorewoPkcehC sehsalF2 emalFoN,tuokcoLruoH1
wolSgnihsalF taeHrofllaCoN,lamroN sehsalF3 eussIrecudnI/hctiwSerusserP
tsaFgnihsalF taeHrofllaC sehsalF4hctiwStimiLerutarepmeTnepO
timiLtuolloRro
nOsuounitnoClortnoCecalpeR-rorrElanretnI
draoBsehsalF5 evlaVsaGtuohtiwemalF
sehsalF7 rorrEtiucriCevlaVsaG
sehsalF8 esneSemalFwoL
Flue Hood and Combustion Blower CleaningBefore each heating season, the Flue Hood and combustionblower should be inspected for signs of any blockage orsooting. Any cleaning required should be performed onlyby a qualified servicer using the following procedure:
1. Turn the room thermostat to the "OFF" position. Turn ofpower to the unit. Turn the main power disconnect OFF.Turn the manual gas valve OFF.
Manifold Pressure Check and Adjust
1. Connect a manometer to the pressure tap at the outlet sideof the unit’s gas valve (remove the Control/Heat accesspanel). Read the manifold pressure with the burners firing.See Figure 19 on page 19 for gas valve connections.
2. If the manifold pressure reading does not match the valueindicated on the unit's nameplate, the unit's pressureregulator must be adjusted as follows:
a. Remove the cover screw on the gas regulator located onthe front side of the unit’s gas valve.
b. Turn the adjusting screw clockwise to increase manifoldpressure or counterclockwise to decrease manifoldpressure.
3. Check the temperature rise during furnace operation toinsure that it falls within the range specified on the unit'snameplate.
4. If the temperature rise noted is outside of the specifiedlimits, adjust the indoor air flow to cause the temperaturerise of the heat exchanger to fall within the required range.
2. Remove the Flue Hood from the side panel.
3. Remove the combustion blower from the vestibule panel.Disconnect blower wiring and pressure switch hose.
4. Wipe blower and Flue Hood clean with a dry cloth.
CAUTION: Never use combustible cleaning fluidson any part of the furnace.
5. Replace the combustion blower gasket with a new one.
6. Reassemble combustion blower and Flue Hood in reverseorder of removal. Reconnect pressure switch hose.
7. Verify all wiring is correct per the unit's wiring diagram.
8. Follow start-up procedure to place unit back in service.Verify proper operation.
Technical Literature - Printed in U.S.A.
American Standard inc.6200 Troup HighwayTyler, TX 75707-9010
American Standard has a policy of continuous productand product data improvement. It reserves the right tochange design and specification without notice.
© 2005 American Standard Inc. Allrights reserved
