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Single Stage Condensing Gas Furnaces
InSTAllATIon InSTrUCTIonS
GUH92A (92.1% AFUE)
Upflow / Horizontal Furnace
• Failure to follow safety warnings exactly could result in serious injury or property damage.
• Installation and service must be performed by a qualified installer, service agency or the gas
supplier.
• Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or
any other appliance.
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any phone in your building.
• Leave the building immediately.
• Immediately call your gas supplier from a neighbors phone.Follow the gas suppliers instructions.
• If you cannot reach your gas supplier, call the fire department.
Do noT DESTroY. PlEASE rEAD CArEFUllY & KEEP In A SAFE PlACE For FUTUrE rEFErEnCE.
GUH95A & GUH95C (95.0% AFUE)
Upflow / Horizontal Furnace
WArnInG
FIrE or EXPloSIon HAZArD
WHAT To Do IF YoU SMEll GAS
92.1% Through 95.0% AFUE
GDD92A (92.1% AFUE) &
GDD95A (95.0% AFUE)
Downflow Furnace
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Table of Contents
Related Manuals for Heat Controller GDD95A
Summary of Contents for Heat Controller GDD95A
- Page 1 Single Stage Condensing Gas Furnaces 92.1% Through 95.0% AFUE InSTAllATIon InSTrUCTIonS GDD92A (92.1% AFUE) & GUH92A (92.1% AFUE) GDD95A (95.0% AFUE) Upflow / Horizontal Furnace GUH95A & GUH95C (95.0% AFUE) Downflow Furnace Upflow / Horizontal Furnace WArnInG FIrE or EXPloSIon HAZArD •...
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Page 2: Table Of Contents
TABlE oF ConTEnTS Accessories ..............19 IMPorTAnT SAFETY InForMATIon ......3 Finish Flange ............19 rEqUIrEMEnTS & CoDES ..........4 Rubber Grommets ............19 PVC Components .............20 Combustion Air Quality ..........5 Typical Orientation ..........20 Heating Load ..............5 Alternate Orientation ..........20 Installation in a Garage ..........6 Optional PVC Pipe Installation ........20 Condensate Drain Lines ...........20 Clearances to Combustible Materials ......6... -
Page 3: Important Safety Information
IMPorTAnT SAFETY InForMATIon FIGUrES & TABlES ............32 Figure 31. GDD92A & GDD95A Cabinet INSTALLER: Please read all instructions before servicing Dimensions ..........32 this equipment. Pay attention to all safety warnings and Figure 32. GUH92A, GUH95A & GUH95C any other special notes highlighted in the manual. Safety Cabinet Dimensions ........33... -
Page 4: Requirements & Codes
• Follow all precautions in the literature, on tags, and and the rating plate for the proper circulating air on labels provided with the equipment. Read and flow and temperature rise. It is important that the duct thoroughly understand the instructions provided with system be designed to provide the correct flow rates the equipment prior to performing the installation and and external pressure rise. -
Page 5: Combustion Air Quality
Combustion Air Quality a.) A (CO) detector and alarm shall be placed on each floor level where there are bedrooms. The detector shall comply with NFPA 720 (2005 Edition) and be CAUTIon: mounted in the living area outside the bedroom(s). b.) The (CO) detector shall: Combustion air must not be drawn from a •... -
Page 6: Installation In A Garage
Installation in a Garage Operation of Furnace During Construction WArnInG: CAUTIon: Do not place combustible material on or against Failure to follow these instructions will void the the furnace cabinet or within 6 inches of the factory warranty and may significantly reduce vent pipe. -
Page 7: Combustion Air & Venting Requirements
CoMBUSTIon AIr & vEnTInG IMPorTAnT InForMATIon: • This furnace must be vented in compliance with rEqUIrEMEnTS the current revision of the National Fuel Gas Code (ANSI-Z223.1/NFPA54). Instructions for determining WArnInG: the adequacy of an installation can be found in the current revision of the NFGC (ANSI Z223.1 / NFPA54). -
Page 8: Direct Vent Furnaces
chemicals . These chemicals can cause severe corrosion Air From Inside in the furnace combustion system. A 2-pipe installation If combustion air is taken from the heated space, the two has the additional advantage that it isolates the system openings must each have a free area of at least one square from the effects of negative pressure in the house. -
Page 9: Outdoor Air Using Horizontal Ducts
Vent or Chimney Ventilation Louvers Vent or Chimney (each end of attic) Outlet NOTE: Air openings shall Air Duct Water Air Ducts must be each have a free area of Heater Water not less than one square at least 1 sq. in. Heater Furnace Furnace... -
Page 10: Alternate Method Of Providing Air From Outside
Alternate Method of Providing Air from combustion and venting, even though the furnace is located in an unconfined space. See Example below. Outside If acceptable under local Codes, it is permitted to provide EXAMPlE outside air using one opening (See NFGC). Generally, A space with a water heater rated at 45,000 Btuh confined spaces must have two openings in the space for input and a furnace rated at 75,000 Btuh requires a... -
Page 11: Vent Pipe Material
Category IV appliances operate with positive vent pressure The equivalent lenghts of tees and various elbows are and therefore require vent systems which are thoroughly listed in . Measure the linear length of your vent run Table 1 sealed. They also produce liquid condensate, which is and then add in the equivalent length of each fitting. -
Page 12: Outdoor Terminations - Horizontal Venting
3. Secure the coupling with the second hose clamp, ensuring that the connection is tight and leak free. Outdoor Terminations - Horizontal Venting • Vent and combustion air intake terminations shall be installed as shown in & and in Figure 7 Figure 8 accordance with these instructions: •... -
Page 13: Outdoor Terminations - Vertical Venting
riser may be provided as shown in Figure 9 (page 12) MAXIMUM FlUE PIPE lEnGTH (FEET) Insulation is required to prevent freezing of this section WInTEr DESIGn In UnConDITIonED & EXTErIor SPACES of pipe. See for vent freezing protection. Table 2 TEMPErATUrE WITHoUT InSUlATIon WITH InSUlATIon*... -
Page 14: Circulating Air Requirements
CIrCUlATInG AIr rEqUIrEMEnTS the coil must be installed downstream (on the outlet side) of the furnace or in parallel with the furnace. • If a cooling system is installed in parallel with the WArnInG: furnace, a damper must be installed to prevent chilled air from entering the furnace and condensing on the Do not allow combustion products to enter the heat exchanger. -
Page 15: Downflow Furnaces
If system installation includes AC coil casing, or upflow return air. GDD92A & GDD95A series gas bend the flanges on the coil casing upward 90° before furnaces may only be installed as a downflow application. -
Page 16: Special Instructions For Guh92A038A3Xe Furnaces
, it is recommended that the drip pan extend Figure 11 at least 12 inches past the top and front of the furnace. PLUGS (X2) noTE: Although it is not required to use a drip pan for heat only applications, state and local codes may require it. If suspending the furnace from the ceiling, assemble a support frame ( ) using slotted iron channel and... -
Page 17: Installation On A Concrete Slab
To install a GDD92A & GDD95A series gas furnace on IMPorTAnT noTE: combustible flooring, a special sub-base is required. The Inducer Assembly must never be positioned to Downflow sub-base kits are factory supplied accessories vent downwards on horizontal installs. -
Page 18: Inducer Assembly Rotation
Figure 15 Figure 16 the proper routing of pressure switch tubing for GUH92A, GUH95A & GUH95C furnaces. Downflow (GDD92A & GDD95A) furnaces require only one switch connected to the inducer’s static tap as shown in Figure 17 Alternate Pressure Switch Location In some inducer orientations, the inducer pressure switch may interfere with gas pipe installation. -
Page 19: Accessories
1. Shut off any electrical power to the furnace. 2. Label and disconnect the tubing and wires from the pressure switch ( Figure 18 3. Remove two screws securing the pressure switch to the inducer housing. 4. Remove the pressure switch from the mounts on the inducer housing and relocate it to the other set of mounts 90°... -
Page 20: Pvc Components
PVC Components 3. Install the 1/2” x 1/2” hose barb on the 2” PVC reducer. noTE: Do not over tighten! Use an adequate amount of IMPorTAnT noTES: Teflon tape on the threads. Do not use liquid sealants. • Before permanently installing these components, 4. -
Page 21: Bottom Panel Removal
Figure 35 Figure 36 Figure 37 Figure 38 Figure 39. venting system. noTE: If using a condensate pump, GUH95A, GUH95C & GDD95A furnaces see Figure the furnace drain line must be installed above the , or Figure 42 Figure 43 pumps water line. -
Page 22: Gas Supply & Piping
GAS SUPPlY & PIPInG The furnace may be installed with either left or right side gas entry. When connecting the gas supply, provide WArnInG: clearance between the gas supply line and the entry hole in the furnace casing to avoid unwanted noise and/or damage to the furnace. -
Page 23: Converting From Natural Gas To Lp / Propane
The furnaces are shipped from the factory with orifices IMPorTAnT noTE: and gas regulator settings for natural gas operation at sea Observe the action of the burners to make sure there level altitudes. At 2,000 feet, the NFGC requires that this is no yellowing, lifting or flashback of the flame. - Page 24 GUH92A SERIES Note “A” Note “A” Note “B” Note “B” Right Side Entry Left Side Entry GUH95A & GUH95C SERIES Note “A” Note “A” Note “B” Note “B” Left Side Entry Right Side Entry (1) Automatic Gas Valve (2) Burner Assembly (3) Dripleg (w/ manual shut-off) (4) Elbow...
- Page 25 GDD92A SERIES Note “A” Note “A” Note “B” Note “B” Left Side Entry Right Side Entry GDD95A Note “A” Note “A” Note “B” Note “B” Left Side Entry Right Side Entry (1) Automatic Gas Valve (2) Burner Assembly (3) Dripleg...
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Page 26: Electrical Wiring
Grounding ElECTrICAl WIrInG WArnInG: WArnInG: To minimize personal injury, the furnace cabinet ELECTRICAL SHOCK, FIRE OR must have an uninterrupted or unbroken electrical EXPloSIon HAZArD ground.The controls used in this furnace require Failure to follow safety warnings exactly could an earth ground to operate properly. Acceptable result in serious injury or property damage. -
Page 27: Twinning
(GUH92A & GDD92A)038A3XF 38,000 14 ¼ 115-60-1 (GUH95A & GDD95A)38B4XF 38,000 17 ½ 115-60-1 GUH95C054B3XE 54,000 17 ½ 115-60-1 11.6 (GUH92A, GUH95A, GDD92A, GDD95A)54B4XF 54,000 17 ½ 115-60-1 GUH95C072C5XE 72,000 17 ½ 115-60-1 11.6 (GUH92A & GDD92A)072B4XF 72,000 115-60-1 10.9... -
Page 28: Start-Up & Adjustments
WArnInG: THERMOSTAT FURNACE 1 FURNACE 2 CONDENSING UNIT CONTROL BOX When servicing either twinned furnace, power CONDENSING UNIT must be turned off on both furnaces. Failure to Expansion Port Expansion Port comply may result in improper operation leading to damage to the furnaces or personal injury! JUMPER PIN SPEED SETUP... -
Page 29: Verifying & Adjusting Input Rate
Verifying & Adjusting Input Rate d.) Replace and tighten the regulator capscrew over the adjustment screw. The input rate must be verified for each installation to prevent over-firing of the furnace. noTE: The input rate Verifying & Adjusting Temperature Rise must not exceed the rate shown on the furnace rating plate. -
Page 30: Configuring The Ecm Blower
System Operation 3. Set the thermostat above room temperature and observe the Operating Sequence. (Gas) Heating Mode 4. Remove the close-off immediately after the limit switch When the thermostat calls for heating, the circuit between opens. If the furnace continues to operate with no return r and W is completed. -
Page 31: Cooling Cycle
9. When the thermostat demand for heat is satisfied, the • Verify the thermostat is properly installed and will not be affected by drafts or heat from lamps or other control de-energizes the gas valve. The Inducer output appliances. remains on for a 30 second post-purge period. •... - Page 32 Gas (Ø 1 5/8) Vent pipe 25 1/2 (Ø 3”) 22 1/2 22 1/2 Vent pipe 25 3/8 (Ø 3”) Cond. (Ø 1 1/16) Cond. (Ø 1 1/16) LEFT SIDE FRONT VIEW RIGHT SIDE Figure 31. GDD92A & GDD95A Cabinet Dimensions...
- Page 33 TOP VIEW BOTTOM VIEW GUH92A UPFLOW / HORIZONTAL FURNACES MODEL #’S DIM. -A- DIM. -B- DIM. -C- Front Brace GUH92A038A3XE 14 1/4 12 5/8 12 7/8 GUH92A054B4XE 17 1/2 15 7/8 16 1/8 GUH92A072B4XE Bottom Panel GUH92A072C5XE 19 3/8 19 5/8 GUH92A090C5XE Flue Combustion...
- Page 34 Airflow Data MAXIMUM AIRFLOW & TEMPERATURE RISES (° F) FOR GUH92A SERIES UPFLOW / HORIZONTAL FURNACES MoDEl nUMBEr EXTErnAl STATIC PrESSUrE (InCHES WATEr ColUMn) & MoTor HEATInG InPUT SPEED (BTUH) rISE rISE rISE rISE rISE rISE rISE rISE High* 1,245 1,200 1,150 1,100...
- Page 35 MAXIMUM AIRFLOW & TEMPERATURE RISES (° F) FOR GUH92A SERIES UPFLOW / HORIZONTAL FURNACES EXTErnAl STATIC PrESSUrE (InCHES WATEr ColUMn) MoDEl nUMBEr & MoTor HEATInG InPUT SPEED (BTUH) rISE rISE rISE rISE rISE rISE rISE rISE High* 2,135 2,095 2,040 1,975 1,910 1,840...
- Page 36 MAXIMUM AIRFLOW & TEMPERATURE RISES (° F) FOR GUH95C SERIES UPFLOW / HORIZONTAL FURNACES WITH ECM MOTOR EXTErnAl STATIC PrESSUrE (In.W.C.) MoTor SWITCH MoDEl nUMBEr SETTInGS & HEATInG (0 =OFF,1 =ON) InPUT (BTUH) CFM rISE CFM rISE CFM rISE CFM rISE CFM rISE CFM rISE CFM rISE CFM rISE —...
- Page 37 MAXIMUM AIRFLOW & TEMPERATURE RISES (° F) FOR GUH95C SERIES UPFLOW / HORIZONTAL FURNACES WITH ECM MOTOR EXTErnAl STATIC PrESSUrE (In.W.C.) MoTor SWITCH MoDEl nUMBEr SETTInGS & HEATInG (0 =OFF,1 =ON) InPUT (BTUH) CFM rISE CFM rISE CFM rISE CFM rISE CFM rISE CFM rISE CFM rISE CFM rISE —...
- Page 38 MAXIMUM AIRFLOW & TEMPERATURE RISES (° F) FOR GUH95A SERIES UPFLOW / HORIZONTAL FURNACES WITH PSC MOTOR EXTErnAl STATIC PrESSUrE (InCHES WATEr ColUMn) MoDEl nUMBEr & MoTor HEATInG InPUT SPEED (BTUH) rISE rISE rISE rISE rISE rISE rISE rISE HIGH* 1519 —...
- Page 39 1. Two openings are required for airflows above 1,600 CFM if filter(s) is(are) adjacent to furnace 2. Temperature rises in the table are approximate. Actual temperature rises may vary. 3. Cells shaded in gray indicate a temperature rise outside of the recommended range. Table 10. GDD95A Downflow Furnaces...
- Page 40 Electrical Information HIGH XFMR R C Y G W Figure 33. Wiring Diagram...
- Page 41 HIGH XFMR R C Y G W Figure 34. Wiring Diagram (Fixed Speed)
- Page 42 Gas Information GAS FloW rATES GAS FloW rATES (CUBIC FEET PEr HoUr) (CUBIC FEET PEr HoUr) CUBIC FEET PEr CUBIC FEET PEr TIME For TIME For rEvolUTIon oF GAS METEr rEvolUTIon oF GAS METEr onE rEvolUTIon onE rEvolUTIon (SEConDS) (SEConDS) 1,800 3,600 1,500...
- Page 43 HIGH AlTITUDE DErATIon – ProPAnE GAS InPUT (BTU) AlTITUDE ABovE 38,000 38,000 SEA lEvEl 54,000 72,000 90,000 108,000 118,000 120,000 (SC MoDElS) (SD MoDElS) ORIFICE SIZE 0 to 1,999 FT 10.0 10.0 10.0 10.0 10.0 10.0 10.0 10.0 MANIFOLD PRESSURE ORIFICE SIZE 2,000 to 2,999 FT MANIFOLD PRESSURE...
- Page 44 HIGH AlTITUDE DErATIon – nATUrAl GAS WITH HIGH HEATInG vAlUE InPUT (BTU) AlTITUDE ABovE 38,000 38,000 SEA lEvEl 54,000 72,000 90,000 108,000 118,000 120,000 (SC MoDElS) (SD MoDElS) ORIFICE SIZE 0 to 1,999 FT MANIFOLD PRESSURE ORIFICE SIZE 2,000 to 2,999 FT MANIFOLD PRESSURE ORIFICE SIZE 3,000 to 3,999 FT...
- Page 45 Venting Information VENT TERMINAL AIR SUPPLY INLET AREA WHERE TERMINAL IS NOT PERMITTED CAnADIAn InSTAllATIonS US InSTAllATIonS Direct Vent (2-pipe) & Clearance location Direct vent Conventional Vent Conventional Vent (1-pipe) (2-pipe) Furnaces (1-pipe) Furnaces Furnaces Clearance above grade, veranda, porch, deck, 12 inches (30cm) 12 inches (30cm) 12 inches (30cm)
- Page 46 GUH92A & GDD92A Series HORIZONTAL VENTING w/ 2-Pipes Straps or other suitable supports Wall (Upflow Furnace Shown) at minimum 5 ft. intervals (both pipes) Seal / caulk around pipes First support as close at wall to furnace as possible 90° Elbows 90°...
- Page 47 GUH92A UPFLOW - 1 PIPE OPTIONS Rubber COMBUSTION COMBUSTION Grommet COMBUSTION Plug Plug NOTE 5 NOTE 5 Rubber Grommet OPTION 1 OPTION 3 OPTION 2 Rubber Grommet PVC Trap See VIEW C for drain line positions See VIEW A for drain line positions See VIEW B for drain line positions VIEW -A- VIEW -B-...
- Page 48 GUH92A HORIZONTAL RIGHT - 1 PIPE OPTIONS Rubber See VIEW D for See VIEW E for Grommet Plug drain line positions drain line positions NOTE 5 Plug COMBUSTION COMBUSTION OPTION OPTION Plug Plug VIEW -D- VIEW -E- VIEW -F- VIEW -G- Drain Line Inline Drain Attached to...
- Page 49 GUH92A HORIZONTAL RIGHT - 2 PIPE OPTIONS Rubber See VIEW H for See VIEW I for Plug Grommet drain line positions drain line positions NOTE 5 Plug COMBUSTION AIR COMBUSTION AIR OPTION OPTION Flange Flange Plug Plug VIEW -H- VIEW -I- VIEW -K- VIEW -J- Drain Line...
- Page 50 GDD92A DOWNFLOW - 1 PIPE OPTIONS COMBUSTION Rubber COMBUSTION Grommet COMBUSTION Plug Plug Option Option Option NOTE 5 NOTE 5 Rubber Grommet Trap Rubber Grommet See VIEW M for drain line positions See VIEW L for drain line positions See VIEW N for drain line positions VIEW -M- VIEW -L- VIEW -N-...
- Page 51 GUH95A, GUH95C & GDD95A Series HORIZONTAL VENTING w/ 2-Pipes Straps or Other Suitable (Upflow Furnace Shown) Seal/Caulk Supports at minimum of 5 ft. Intervals Around Pipes at Building 90° 90° Elbow Elbow COMBUSTION AIR 90° Elbow Upward Pitch - 1/4” per foot 12”...
- Page 52 GUH95A & GUH95C UPFLOW - 1 PIPE OPTIONS COMBUSTION COMBUSTION NOTE 5 PVC Tee PVC Trap NOTE 5 PVC Tee Rubber Grommet OPTION 21 OPTION 22 PVC Trap Rubber Grommet See VIEW O for drain line positions See VIEW P for drain line positions VIEW -O- VIEW -P- Drain Line Attached...
- Page 53 GUH95A & GUH95C HORIZONTAL RIGHT - 1 PIPE OPTION GUH95A & GUH95C HORIZONTAL LEFT - 1 PIPE OPTION Rubber Rubber Option Option Grommet Grommet COMBUSTION COMBUSTION See VIEW R for See VIEW Q for Plug Plug drain line positions drain line positions Inline Drain (Factory Supplied) See NOTE 3...
- Page 54 PVC Trap PVC Tee Rubber Grommet PVC Trap Rubber Grommet See VIEW S for drain line positions See VIEW T for drain line positions See VIEW U for drain line positions Figure 43. Venting Options for Downflow Installations (GDD95A Series)
- Page 55 TroUBlESHooTInG DIAGnoSTIC DESCrIPTIon rED lED GrEEn lED If the furnace fails to operate check the following: • Is the thermostat operating properly? Control Fault (No Power) • Are the blower compartment door(s) in place? Normal Operation • Is the furnace disconnect closed? Motor Fault Flash •...
- Page 56 UPFLOW / HORIZONTAL FURNACE (GUH92A SERIES) Finish Flange Igniter Flame Roll-Out Burner Sensor Switch Assembly Gas Manifold Control Board Gas Valve Main Air Limit Switch Vent Limit Switch Pressure Switch - Condensate Inducer Assembly (‘B’, ‘C’, & ‘D’ cabinets only) Pressure Switch Transformer (Inducer)
- Page 57 Finish Flange Blower Assembly (behind blower panel) Furnace Control Board Blower Door Switch Transformer (behind blower panel) Inducer Limit Switch Inducer Assembly Pressure Switch Gas Valve Igniter Flame Sensor Burner Roll-Out Assembly Switch Manifold Figure 45. GDD92A & GDD95A Component Locations...
- Page 60 INSTALLATION / PERFORMANCE CHECK LIST InSTAllEr nAME: ElECTrICAl SYSTEM Electrical connections tight? CITY: STATE: Line voltage polarity correct? InSTAllATIon ADDrESS: Supply Voltage: ..............VOLTS CITY: STATE: Has the thermostat been calibrated? Is the thermostat level? UNIT MODEL # Is the heat anticipator setting correct? UNIT SERIAL # GAS SYSTEM Minimum clearances per...