COMFORT-AIRE GUH95C Installation Instructions Manual
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COMFORT-AIRE GUH95C Installation Instructions Manual

COMFORT-AIRE GUH95C Installation Instructions Manual

Warm air gas furnace
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Upflow/Horizontal Left and Right Air Discharge
This is a safety alert symbol and should never be ignored. When you see this symbol on labels or in
manuals, be alert to the potential for personal injury or death.
Unit Dimensions ..........................................................2
Parts Arrangement.......................................................3
Gas Furnace ................................................................4
Shipping and Packing List ...........................................4
Safety Information .......................................................4
General ........................................................................6
Combustion, Dilution & Ventilation Air .........................6
Installation ...................................................................9
Filters .........................................................................13
Duct System ..............................................................13
Venting Practices .......................................................16
Condensate Piping ....................................................34
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, personal
injury or loss of life. Installation and service must be
performed by a licensed professional installer (or
equivalent), service agency or the gas supplier.
Manufactured By
Comfort-Aire / Century
1900 Wellworth Ave.
Jackson, MI 49203
507716-01
INSTALLATION INSTRUCTIONS
Warm Air Gas Furnace
This manual must be left with the homeowner for future reference.

Table of Contents

WARNING
Save these instructions for future reference
GUH95C
Gas Piping .................................................................38
Electrical ....................................................................41
Unit Start-Up ..............................................................44
Air for Non-Direct Vent Applications ..........................48
Other Unit Adjustments..............................................49
Blower Performance ..................................................50
Service.......................................................................52
Planned Service ........................................................54
Repair Parts List ........................................................55
Start-Up & Performance Checklist.............................56
As with any mechanical equipment, personal injury can
result from contact with sharp sheet metal edges. Be
careful when you handle this equipment.
Issue 1717
CAUTION
*P507716-01*
(P) 507716-01
Page 1 of 58

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  • Page 1: Table Of Contents

    (or careful when you handle this equipment. equivalent), service agency or the gas supplier. Manufactured By *P507716-01* Comfort-Aire / Century 1900 Wellworth Ave. (P) 507716-01 Jackson, MI 49203 Save these instructions for future reference...

  • Page 2: Unit Dimensions

    Optional External Side Return Air Filter kit is not for use with optional Return Air Base. * Consider sizing requirements for optional IAQ equipment before cutting side return opening. FRONT VIEW SIDE VIEW Model GUH95C 045-2 045-3 17-1/2 16-3/8 7-5/8 070-2...

  • Page 3: Parts Arrangement

    Parts Arrangement Figure 1. 507716-01 Issue 1717 Page 3 of 58...

  • Page 4: Gas Furnace

    1 - Snap bushing or upflow applications with bottom return air. 1 - Snap Plug The GUH95C can be installed as either a Direct Vent or a 1 - Wire tie Non-Direct Vent gas central furnace. 1 - Condensate trap...
  • Page 5 In order to ensure proper unit operation in non-direct vent applications, combustion and ventilation air supply must be provided according to the current National Fuel Gas Code or CSA-B149 standard. Installation Locations This furnace is CSA International certified for installation clearances to combustible material as listed on the unit nameplate and in the table in Figure 13 and Figure 18.

  • Page 6: General

    • The return air duct must be provided and sealed to the • Gas furnaces shall be installed by a licensed plumber furnace. or fitter only. • Return air temperature range between 60°F (16°C) • The gas cock must be “T handle” type. and 80°F (27°C) must be maintained.
  • Page 7 Unconfined Space In the past, there was no problem in bringing in sufficient outdoor air for combustion. Infiltration provided all the air An unconfined space is an area such as a basement that was needed. In today’s homes, tight construction or large equipment room with a volume greater than 50 practices make it necessary to bring in air from outside cubic feet (1.42 m³) per 1,000 Btu (.29 kW) per hour of...
  • Page 8 When communicating with the outdoors through horizontal ducts, each opening shall have a minimum free area of 1 square inch (645 mm²) per 2,000 Btu (.56 kW) per hour of the total input rating of all equipment in the enclosure. See Figure 8.

  • Page 9: Installation

    Shipping Bolt Removal Units with 1/2 hp & 3/4 hp blower motor are equipped WARNING with three flexible legs and one rigid leg. The rigid leg is equipped with a shipping bolt and a flat white plastic If this unit is being installed in an application with washer (rather than the rubber mounting grommet used combustion air coming in from a space serviced by an with a flexible mounting leg).
  • Page 10 Tilt the unit slightly (Max. 1/2”) from back to front to aid in the draining of the heat exchanger. Unit must be level side-to-side in all applications. Figure 12. Setting Equipment WARNING Improper installation of the furnace can result in personal injury or death.
  • Page 11 Return Air Guidelines Return air can be brought in through the bottom or either side of the furnace installed in an upflow application. If the furnace is installed on a platform with bottom return, make an airtight seal between the bottom of the furnace and the platform to ensure that the furnace operates properly and safely.
  • Page 12 Right−Hand Discharge Flow Flow Bottom (Floor)** Left−Hand Discharge Flow Flow Bottom (Floor)** Figure 16. Removing the Bottom Panel Top/Plenum 1 in. (25 mm) * Front Removing the Bottom Panel Front* Back Remove the two screws that secure the bottom cap to the Back Sides 0†...

  • Page 13: Filters

    NOTE: Heavy-gauge sheet metal straps may be used to Filters suspend the unit from roof rafters or ceiling joists. When straps are used to suspend the unit in this way, support must be provided for both the ends. The straps must not This unit is not equipped with a filter or rack.
  • Page 14 D2665 Pipe & Fittings) ASTM PRIMER & SOLVENT CEMENT IMPORTANT SPECIFICATION GUH95C exhaust and intake connections are made PVC & CPVC Primer F656 of PVC. Use PVC primer and solvent cement when PVC Solvent Cement D2564 using PVC vent pipe. When using ABS vent pipe, use...
  • Page 15 STANDARD CONCENTRIC Outdoor Outdoor Exhaust Exhaust Flush Mount 1-1/2" 2" Concentric 3" Concentric VENT Accelerator Accelerator Concentric Kit Capacity PIPE DIA. (Dia. X Length) (Dia. X Length) (in.) 71M80 69M29 60L46 1-1/2" x12" 2" x12" 51W11** +44W92++ +44W92++ 44W93+ 2-1/2" 2-1/2"...

  • Page 16: Venting Practices

    NOTE: Assembly should be completed within 20 seconds after last application of cement. Hammer blows should not WARNING be used when inserting pipe. CARBON MONOXIDE POISONING HAZARD After assembly, wipe excess cement from pipe at end Failure to follow the steps outlined below for each of fitting socket.
  • Page 17 Contact Comfort-Aire / Century for assistance in is probably oversized for the single water heater or sizing vent pipe in these applications.
  • Page 18 IMPORTANT Do not use screens or perforated metal in exhaust or 045, 070, Furnace capacity? intake terminations. Doing so will cause freeze-ups and 090, 110 may block the terminations. Capacity Min. Vent Length* Standard or 045, 070, 090, 110 15 ft or 5 ft plus 2 elbows or Which termination? Concentric? 10 ft plus 1 elbow...
  • Page 19 GUH95C Maximum Allowable Intake or Exhaust Vent Length in Feet Standard Termination at Elevation 0 - 4,500 ft 2nd Pipe 2-1/2" Pipe 3" Pipe Number Capacity Capacity Capacity of 90° Elbows Used Standard Termination at Elevation 4,500 - 10,000 ft 2nd Pipe 2-1/2"...
  • Page 20 GUH95C Maximum Allowable Intake or Exhaust Vent Length in Feet Concentric Termination at Elevation 0 - 4,500 ft 2nd Pipe 2-1/2" Pipe 3" Pipe Number Capacity Capacity Capacity of 90° Elbows Used Concentric Termination Elevation 4500 - 10,000 ft 2nd Pipe 2-1/2"...
  • Page 21 Maximum Allowable Exhaust Vent Lengths with Furnace Installed in a Closet or Basement Using Ventilated Attic or Crawl Space for Intake Air in Feet Standard Termination at Elevation 0 - 4,500 ft 2" Pipe 2-1/2" Pipe 3" Pipe Number Capacity Capacity Capacity of 90°...
  • Page 22 Figure 25. Figure 26. Page 22 of 58 Issue 1717 507716-01...
  • Page 23 Figure 27. Figure 28. Intake Piping 1. Use transition solvent cement or a sheet metal screw to secure the intake pipe to the inlet air connector. Figure 27 through Figure 28 Route piping to outside of structure. Continue with This gas furnace may be installed in either direct vent installation following instructions given in general or non-direct vent applications.
  • Page 24 intake opening (with the protective screen) should always be directed forward or to either side in the upflow position, and either straight out or downward in the horizontal position. The air intake piping must not terminate too close to the flooring or a platform. Ensure that the intake air inlet will not be obstructed by loose insulation or other items that may clog the debris screen.
  • Page 25 NOTE: See Table 6 for maximum allowed exhaust pipe length without insulation in unconditioned space during Roof Terminated winter design temperatures below 32°F (0°C). If required Exhaust Pipe exhaust pipe should be insulated with 1/2” (13 mm) Armaflex or equivalent. In extreme cold climate areas, 3/4”...
  • Page 26 Maximum Allowable Exhaust Vent Pipe Length (in ft.) without Insulation in Unconditioned Space For Winter Design Temperatures Single - Stage High Efficiency Furnace Unit Input Size Vent Pipe Winter Design Temperatures ºF (ºC) Diameter 2 in. 32 to 21 (0 to -6) 2-1/2 in.
  • Page 27 ‡ Permitted only if veranda, porch, deck or balcony is fully open on a minimum of two sides beneath the floor. Comfort-Aire / Century recommends avoiding this location if possible. Figure 34. Vent Termination Clearances for Non-Direct Installations...
  • Page 28 ‡ Permitted only if veranda, porch, deck or balcony is fully open on a minimum of two sides beneath the floor. Comfort-Aire / Century recommends avoiding this location if possible. Figure 35. Vent Termination Clearances for Direct Installations...
  • Page 29 Details of Intake and Exhaust Piping 3”(76MM) MAX. SIZE PER EXHAUST PIPE Inches (MM) Terminations for Direct Vent Installations TERMINATION SIZE NOTE: In Direct Vent installations, combustion air is taken REDUCTION TABLE from outdoors and flue gases are discharged to outdoors. UNCONDITIONED ATTIC SPACE 8”...
  • Page 30 FIELD FABRICATED WALL TERMINATION NOTE − FIELD−PROVIDED REDUCER MAY BE 2” (51mm) 3” (76mm) REQUIRED TO ADAPT LARGER VENT PIPE SIZE Vent Pipe Vent Pipe TO TERMINATION A− Minimum clearance above grade or average 12” (305 mm) 12” (305 mm) snow accumulation B−...
  • Page 31 On field supplied terminations, a minimum distance between the end of the exhaust pipe and the end of the intake pipe without a termination elbow is 8” and a minimum distance of 6” with a termination elbow. See Figure 39. If intake and exhaust piping must be run up a side wall to position above snow accumulation or other obstructions, piping must be supported every 24”...
  • Page 32 Details of Exhaust Piping Terminations for Non- If exhaust piping must be run up a sidewall to position above snow accumulation or other obstructions, piping Direct Vent Applications must be supported every 24” (610 mm) as shown in Exhaust pipes may be routed either horizontally through Figure 47.
  • Page 33 Exhaust through Crawl Space Vent Option All 33” condensing gas furnaces (92%+) are now approved Exhaust from to be vented down through a crawl space. The following Furnace diagrams show the approved methods. Ensure a sanitary To Termination tee is used as directed for condensate control. Consult the vent tables for vent lengths and approved materials.

  • Page 34: Condensate Piping

    Figure 55 and Figure 56 show the furnace and Condensate Piping evaporator coil using a separate drain. If necessary the condensate line from the furnace and evaporator This unit is designed for either right or left side exit of coil can drain together. See Figure 57 and Figure 58. condensate piping in upflow applications.
  • Page 35 * Piping from furnace must slope down a minimum of 1/4” per ft. toward trap. Figure 53. Condensate Trap Locations (Unit shown in upflow position with remote trap) Figure 54. Condensate Trap with Optional Overflow Switch WARNING When combining the furnace and evaporator coil drains together, the A/C condensate drain outlet must be vented to relieve pressure in order for the furnace pressure switch to operate properly.
  • Page 36 * Piping from furnace must slope down a minimum of 1/4” per ft. toward trap. Figure 55. Condensate Trap Locations Figure 56. Unit with Cooling Coil Using Separate Figure 57. Evaporator Coil Using a Common Drain Drain Piping from furnace and evaporator coil must slope down a minimum 1/4” per ft. toward trap. Figure 58.
  • Page 37 Figure 59. Trap / Drain Assembly Using 1/2” PVC or 3/4” PVC 507716-01 Issue 1717 Page 37 of 58...

  • Page 38: Gas Piping

    Gas Piping IMPORTANT Compounds used on threaded joints of gas piping must be resistant to the actions of liquified petroleum gases. CAUTION If a flexible gas connector is required or allowed by the authority that has jurisdiction, black iron pipe shall Leak Check be installed at the gas valve and extend outside the After gas piping is completed, carefully check all piping...
  • Page 39 Figure 61. Gas Piping Upflow Applications Figure 62. Gas Piping Horizontal Applications 507716-01 Issue 1717 Page 39 of 58...
  • Page 40 Gas Pipe Capacity - FT³/HR (kL/HR) Nominal Length of Pipe - feet (m) Internal Iron Pipe Diameter Size - - inches inches (3.048) (6.096) (9.144) (12.192) (15.240) (18.288) (21.336) (24.384) (27.432) (30.480) (mm) (mm) .622 (12.7) (17.799) (4.96) (3.40) (2.75) (2.32) (2.07) (1.87)

  • Page 41: Electrical

    The unit is equipped with a field makeup box. The makeup Electrical box may be moved to the right side of the furnace to facilitate installation. Seal unused openings on left side with plugs removed from right side. Secure the excess wire ELECTROSTATIC DISCHARGE (ESD) to the existing harness to protect it from damage.
  • Page 42 use an external relay. See Figure 68 for control board Install the room thermostat according to the instructions configuration. This terminal is energized in the heating provided with the thermostat. See Figure 65 for thermostat mode when the combustion air inducer is operating. designations.
  • Page 43 045B(E)3 070B(E)3 090C(E)4 110C(E)5 135D(E)5 Figure 67. Typical Wiring Diagram 507716-01 Issue 1717 Page 43 of 58...

  • Page 44: Unit Start-Up

    Terminal Designations 120 HUM Humidifier (120 VAC) LINE Input (120 VAC) XFMR Transformer (120 VAC) CIRC Indoor Blower (120 VAC) Electronic Air Cleaner (120 VAC) COOL Blower - Cooling Speed (24 VAC) HEAT Blower - Heating Speed (24 VAC) Blower - Fan Speed (24 VAC) PARK Dead terminals to park all speed taps NEUTRALS...
  • Page 45 Priming Condensate Trap The condensate trap should be primed with water prior to start-up to ensure proper condensate drainage. Either pour 10 fl. oz. (300 ml) of water into the trap, or follow these steps to prime the trap: Follow the lighting instructions to place the unit into operation.
  • Page 46 Supply Pressure Measurement After a 15 second pre-purge, the hot surface ignitor energizes. When testing supply gas pressure, use the 1/8” N.P.T. After a 20 second ignitor warm-up period, the gas plugged tap or pressure post located on the gas valve to valve solenoid opens.
  • Page 47 * Conversion requires installation of a gas valve regulator spring which is provided with the gas conversion kit. + LP Kits include low line pressure switch. GUH95C Pressure Switch Requirements at Varying Altitudes 0 - 4500 ft 4501 - 7500 ft...

  • Page 48: Testing For Proper Venting And Sufficient Combustion Air For Non-Direct Vent Applications

    Testing for Proper Venting and Sufficient Combustion Air for Non-Direct Vent Applications Seal any unused openings in the venting system. Visually inspect the venting system for proper size WARNING and horizontal pitch. Determine there is no blockage CARBON MONOXIDE POISONING HAZARD or restriction, leakage, corrosion, or other deficiencies which could cause an unsafe condition.

  • Page 49: Other Unit Adjustments

    Constant Torque Motor Other Unit Adjustments These units are equipped with a constant torque ECM motor. It has a DC motor coupled to an electronic control module both contained in the same motor housing. The Primary Limit motor is programmed to provide constant torque at each of The primary limit is located on the heating compartment the five selectable speeds.

  • Page 50: Blower Performance

    Blower Performance GUH95C 045*B3 Performance (Less Filter) External Air Volume / Watts at Various Blower Speeds Static High Medium - High Medium Medium - Low Pressure Watts Watts Watts Watts Watts in. w.c. 0.00 1345 1255 1150 0.10 1305 1225 1105 0.20...
  • Page 51 GUH95C 110*C5 Performance (Less Filter) Air Volume / Watts at Various Blower Speeds External Bottom Return Air, Side Return Air with Optional Return Air Base, Return Air from Single Side Return Air - Air volumes in bold require field fabricated transition to Static Both Sides or Return Air from Bottom and One Side.

  • Page 52: Service

    Winterizing and Condensate Trap Care Service 1. Turn off power to the furnace. Have a shallow pan ready to empty condensate water. Remove the clean out cap from the condensate trap WARNING and empty water. Inspect the trap then reinstall the clean out cap.
  • Page 53 19. Remove the primary limit from the vestibule panel. 41. Reconnect flame rollout switch wires. 20. Remove top cap screws to allow top cap to be 42. Reconnect sensor wire and reconnect 2 pin plug from tilted upward to allow clearance for removing heat ignitor.

  • Page 54: Planned Service

    Planned Service A service technician should check the following items Red LED Flash Diagnostic Codes / Status of Furnace during an annual inspection. Power to the unit must be Code shut off for safety. No power to control or control hardware LED Off fault detected Fresh air grilles and louvers (on the unit and in the...

  • Page 55: Repair Parts List

    Repair Parts List The following repair parts are available through Comfort-Aire / Century dealers. When ordering parts, include the complete furnace model number listed on the CSA nameplate. All service must be performed by a licensed professional installer (or equivalent), service agency, or gas supplier.

  • Page 56: Start-Up & Performance Checklist

    Start-Up & Performance Checklist Page 56 of 58 Issue 1717 507716-01...
  • Page 57 UNIT OPERATION HEATING MODE COOLING MODE INDOOR BLOWER AMPS______ COMBUSTION SAMPLE CO CO PPM_______ TEMPERATURE DROP ______ Return Duct Temperature _________ INDOOR BLOWER AMPS______ Supply Duct Temperature _______ Temperature Drop = _________ TEMPERATURE RISE TOTAL EXTERNAL STATIC (dry coil) Supply Duct Temperature ________ Supply External Static _______ Return Duct Temperature _____...
  • Page 58 Requirements for Commonwealth of Massachusetts Modifications to NFPA-54, Chapter 10 INSPECTION. The state or local gas inspector of the side wall, horizontally vented, gas-fueled equipment Revise NFPA-54 section 10.8.3 to add the following shall not approve the installation unless, upon requirements: inspection, the inspector observes carbon monoxide For all side wall, horizontally vented, gas-fueled equipment...

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