INSTALLATION INSTRUCTIONS A95UH1D, A93UH1D, 95G1UH-P & 92G1UH-P Warm Air Gas Furnace Upflow/Horizontal Left and Right Air Discharge This manual must be left with the homeowner for future reference. 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. Table of Contents Unit Dimensions...........................................................2 Parts Arrangement...................................
Unit Dimensions 1 NOTE - 20C and 20D (5 Ton) size units installed in upflow applications that require air volumes of 1800 cfm (850 L/s) or greater must have one of the following: 1. 2. 3. 4. 5. Single side return air with transition, to accommodate 20 x 25 x 1 in. (508 x 635 x 25 mm) cleanable air filter. (Required to maintain proper air velocity.) Single side return air with optional “RAB” Return Air Base. Bottom return air. Return air from both sides. Bottom and one side return air.
Parts Arrangement Figure 1.
Gas Furnace Shipping and Packing List The A95UH1D / A93UH1D / 95G1UHD / 92G1UHD Category IV gas furnace is shipped ready for installation in the upflow or horizontal position. The furnace is shipped with the bottom panel in place. The bottom panel must be removed if the unit is to be installed in horizontal or upflow applications with bottom return air.
A95UH1D/A93UH1D/95G1UH-P & 92G1UH-P units are CSA International certified to ANSI Z21.47 and CSA 2.3 standards. Building Codes In the USA, installation of gas furnaces must conform with local building codes. In the absence of local codes, units must be installed according to the current National Fuel Gas Code (ANSI Z223.1/NFPA 54). The National Fuel Gas Code is available from the American National Standards Institute, Inc., 11 West 42nd Street, New York, NY 10036.
Use of Furnace as a Construction Heater General WARNING These instructions are intended as a general guide and do not supersede local codes in any way. Consult authorities having jurisdiction before installation. Gas furnaces manufactured on or after May 1, 2017, are not permitted to be used in Canada for heating of buildings or structures under construction. The following statement only applies to the US.
Combustion, Dilution & Ventilation Air If this unit is installed as a Non-Direct Vent Furnace, follow the guidelines in this section. NOTE: In Non-Direct Vent Installations, combustion air is taken from indoors and flue gases are discharged outdoors. of this information has been reprinted with permission from the National Fuel Gas Code (ANSI-Z223.1/NFPA 54).
When the furnace is installed so that supply ducts carry air circulated by the furnace to areas outside the space containing the furnace, the return air must be handled by ducts which are sealed to the furnace casing and which terminate outside the space containing the furnace. This is especially important when the furnace is mounted on a platform in a confined space such as a closet or small equipment room.
Ventilation Louvers Roof Terminated Exhaust Pipe Inlet Air (Minimum 12 in. (305mm) above Attic Floor) *Intake Debris Screen (Provided) Furnace * See Maximum Vent Lengths table NOTE: The inlet and outlet air openings shall each have a free area of at least one square inch per 4,000 Btu (645 mm2 per 1.17 kW) per hour of the total input rating of all equipment in the enclosure. Figure 8.
Allow for clearances to combustible materials as indicated on the unit nameplate. Installation Setting Equipment WARNING Improper installation of the furnace can result in personal injury or death. Combustion and flue products must never be allowed to enter the return air system or air in the living space. Use sheet metal screws and joint tape to seal return air system to furnace. WARNING Do not connect the return air ducts to the back of the furnace.
Markings are provided on both sides of the furnace cabinet for installations that require side return air. Cut the furnace cabinet at the maximum dimensions shown on Page 2. Furnace applications which include side return air and a condensate trap installed on the same side of the cabinet (trap can be installed remotely within 5 ft.) require either a return air base or field-fabricated transition to accommodate an optional IAQ accessory taller than 14.5”. See Figure 14. Top/Plenum 1 in.
Removing the Bottom Panel Remove the two screws that secure the bottom cap to the furnace. Pivot the bottom cap down to release the bottom panel. Once the bottom panel has been removed, reinstall the bottom cap. See Figure 16. Figure 16. Removing the Bottom Panel Top/Plenum 1 in. (25 mm) *Front 0 Back 0 Sides 0† Vent 0 Floor 0‡ * Front clearance in alcove installation must be 24 in. (610 mm). Maintain a minimum of 24 in. (610 mm) for front service access.
NOTE: Heavy-gauge sheet metal straps may be used to 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 interfere with the plenum or exhaust piping installation. Cooling coils and supply and return air plenums must be supported separately. Filters This unit is not equipped with a filter or rack. A field provided filter is required for the unit to operate properly.
unit operates properly and safely. Use fiberglass sealing strips, caulking, or equivalent sealing method between the plenum and the furnace cabinet to ensure a tight seal. If a filter is installed, size the return air duct to fit the filter frame. Cement to bond the pipe to the flue collar, or to bond the 90° elbow or reducing 90° elbow to the flue collar. In addition, the first three feet of vent pipe from the furnace flue collar must be accessible for inspection.
STANDARD Capacity VENT PIPE DIA. (in.) Outdoor Exhaust Accelerator Outdoor Exhaust Accelerator (Dia. X Length) 070 090 110 135 Flush Mount Kit 1-1/2” Concentric Kit 2” Concentric Kit 3” Concentric Kit 51W11 ** 71M80 or +44W92++ 69M29 or +44W92++ 60L46 or 44W93+ (Dia.
Venting Practices Figure 21. Removal of the Furnace from Common Vent In the event that an existing furnace is removed from a venting system commonly run with separate gas appliances, the venting system is likely to be too large to properly vent the remaining attached appliances. 1. Seal any unused openings in the common venting system. 2. Inspect the venting system for proper size and horizontal pitch.
Exhaust Piping See Figure 25 and Figure 26 1. In areas where piping penetrates joist or interior walls, hole must be large enough to allow clearance on all sides of pipe through center of hole using a hanger. 2. When furnace is installed in a residence where unit is shut down for an extended period of time, such as a vacation home, make provisions for draining condensate collection from trap and lines. 3. Route piping to outside of structure.
Use Figure 24 to correctly size vent pipe diameter. 1 Furnace capacity? 045, 070, 090, 110 2 Which termination? Standard or Concentric? See Table 3 3 Which needs most elbows? Intake or Exhaust? 4 How many? 5 Desired pipe size? 6 What is the altitude? 7 Use Table 5 or Table 6 to find max pipe length. 2”, 2-1/2” or 3” Figure 24.
A93UH1D and 92G1UH-P Maximum Allowable Intake or Exhaust Vent Length in Feet Standard Termination at Elevation 0 - 10,000 ft Number of 90° Elbows Used 2" Pipe 2-1/2" Pipe 3" Pipe Capacity Capacity Capacity 045 070 090 110 1 76 61 39 2 71 56 3 66 4 135 045 070 090 110 19 110 95 63 34 14 105 90 51 29 9 100 61 46 24 5 56 41 19 6 51 36 14 7 46 31 9 8 41 26 9 36 21 10 31 16 n/a n/a n/a 135 045 070 090 110 135 38 132 132 113 113 109 58 3
A93UH1D and 92G1UH-P Maximum Allowable Exhaust Vent Length with Furnace Installed in a Closet or Basement Using Ventilated Attic or Crawl Space for Intake in Feet Standard Termination at Elevation 0 - 10,000 ft Number of 90° Elbows Used 2" Pipe 2-1/2" Pipe 3" Pipe Capacity Capacity Capacity 045 070 090 110 1 66 51 29 2 61 46 24 3 56 41 4 51 5 045 070 090 110 9 95 80 48 4 90 75 19 85 36 14 46 31 9 6 41 26 4 7 36 21 8 31 16 9 26 11 n/a 135 n/a n/a 045
A95UH1D and 95G1UH-P Maximum Allowable Intake or Exhaust Vent Length in Feet Standard Termination at Elevation 0 - 4,500 ft Number of 90° Elbows Used 2" Pipe 2-1/2" Pipe 3" Pipe Capacity Capacity Capacity 045 070 090 110 1 76 61 39 2 71 56 3 66 4 135 045 070 090 110 19 110 95 63 34 14 105 90 51 29 9 100 61 46 24 5 56 41 19 6 51 36 14 7 46 31 9 8 41 26 9 36 21 10 31 16 n/a n/a n/a 135 045 070 090 110 135 38 132 132 113 113 109 58 33
A95UH1D and 95G1UH-P Maximum Allowable Intake or Exhaust Vent Length in Feet Concentric Termination at Elevation 0 - 4,500 ft Number of 90° Elbows Used 2" Pipe 2-1/2" Pipe 3" Pipe Capacity Capacity Capacity 045 070 090 110 1 68 53 37 2 63 48 3 58 4 135 045 070 090 110 17 100 85 59 32 12 95 80 43 27 7 90 53 38 22 5 48 33 17 6 43 28 12 7 38 23 7 8 33 18 9 28 13 10 23 8 n/a n/a n/a 135 045 070 090 110 135 34 116 116 109 109 100 54 29
A95UH1D and 95G1UH-P Maximum Allowable Exhaust Vent Length with Furnace Installed in a Closet or Basement Using Ventilated Attic or Crawl Space for Intake in Feet Standard Termination at Elevation 0 - 4,500 ft Number of 90° Elbows Used 2" Pipe 2-1/2" Pipe 3" Pipe Capacity Capacity Capacity 045 070 090 110 1 66 51 29 2 61 46 24 3 56 41 4 51 5 135 045 070 090 110 9 95 95 73 4 90 90 19 85 36 14 46 31 9 6 41 26 4 7 36 21 8 31 16 9 26 11 10 21 6 n/a n/a
Figure 25. Figure 26.
Figure 27. Figure 28. Intake Piping See Figure 27 through Figure 30 This gas furnace may be installed in either direct vent or non-direct vent applications. In non-direct vent applications, when intake air will be drawn into the furnace from the surrounding space, the indoor air quality must be considered and guidelines listed in Combustion, Dilution and Ventilation Air section must be followed.
Figure 30. 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. Figure 29. 2. If intake air is drawn from a ventilated attic (Figure 31) or ventilated crawlspace (Figure 32) the exhaust vent length must not exceed those listed in Table 5B or Table 6C.
General Guidelines for Vent Terminations In Non–Direct Vent applications, combustion air is taken from indoors and the flue gases are discharged to the outdoors. This furnace is then classified as a non–direct vent, Category IV gas furnace. Roof Terminated Exhaust Pipe Ventilation Furnace Louvers (Crawl Space) Coupling or 3 in. to 2 in. Transition (Field Provided) In Direct Vent applications, combustion air is taken from outdoors and the flue gases are discharged to the outdoors.
VENT TERMINATION CLEARANCES FOR NON-DIRECT VENT INSTALLATIONS IN THE US AND CANADA INSIDE CORNER DETAIL G H A D E B L Fixed Closed Operable F B B C B K AREA WHERE TERMINAL IS NOT PERMITTED AIR SUPPLY INLET VENT TERMINAL M J A B I Fixed Closed Operable US Installations1 A= Clearance above grade, veranda, porch, deck or balcony B= Clearance to window or door that may be opened C= Clearance to permanently closed window D= Vertical clearance to ventilated soffit located above the ter
VENT TERMINATION CLEARANCES FOR DIRECT VENT INSTALLATIONS IN THE USA AND CANADA INSIDE CORNER DETAIL G H A D E B L Fixed Closed Operable F B B C Operable B A B M K J AREA WHERE TERMINAL IS NOT PERMITTED AIR SUPPLY INLET VENT TERMINAL I Fixed Closed US Installations1 A= Clearance above grade, veranda, porch, deck or balcony B= Clearance to window or door that may be opened C= Clearance to permanently closed window D= Vertical clearance to ventilated soffit located above the terminal
In both Non–Direct Vent and Direct Vent applications, the vent termination is limited by local building codes. In the absence of local codes, refer to the current National Fuel Gas Code ANSI Z223-1/NFPA 54 in U.S.A., and current CSA-B149 Natural Gas and Propane Installation Codes in Canada for details. Position termination according to location given in Figure 34 or Figure 35. In addition, position termination so it is free from any obstructions and 12” above the average snow accumulation.
Inches (MM) 3”(76MM) MAX. UNCONDITIONED ATTIC SPACE 8” (203MM) MIN the intake pipe without a termination elbow is 8” and a minimum distance of 6” with a termination elbow. See Figure 44. SIZE PER EXHAUST PIPE TERMINATION SIZE REDUCTION TABLE 7. 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” (610 mm) as shown in Figure 44.
FIELD-PROVIDED REDUCER MAY BE REQUIRED TO ADAPT LARGER VENT PIPE SIZE TO TERMINATION OUTSIDE WALL EXHAUST VENT INTAKE AIR CLAMP (Not Furnished) 3”-8” (76MM-203MM) 1-1/2” (38mm) accelerator provided on 71M80 & 44W92 kits for -45 and -70 units INTAKE AIR INTAKE AIR STRAIGHT-CUT OR ANGLE-CUT IN DIRECTION OF ROOF SLOPE 8” - 12” (203MM - 305MM) EXHAUST VENT 12” (305mm) Min. above grade or average snow accumulation.
FIELD FABRICATED WALL TERMINATION NOTE − FIELD−PROVIDED REDUCER MAY BE REQUIRED TO ADAPT LARGER VENT PIPE SIZE TO TERMINATION 2” (51mm) 3” (76mm) Vent Pipe Vent Pipe D D B C1 A B Intake Elbow C2 A STRAIGHT APPPLICATION * WALL SUPPORT D E D E B B A C1 EXTENDED APPLICATION A C2 A− Minimum clearance above grade or average snow accumulation 12” (305 mm) 12” (305 mm) B− Maximum horizontal separation between intake and exhaust 6” (152 mm) 6” (152 mm) C1 -Minimum from end of exhaust t
Details of Exhaust Piping Terminations for NonDirect Vent Applications Exhaust pipes may be routed either horizontally through an outside wall or vertically through the roof. In attic or closet installations, vertical termination through the roof is preferred. Figure 45 through Figure 48 show typical terminations. 1. Exhaust piping must terminate straight out or up as shown. The termination pipe must be sized as listed in Table 8.
Exhaust through Crawl Space Vent Option All 33” condensing gas furnaces (92%+) are now approved to be vented down through a crawl space. Ensure a vent pipe drain kit, 51W18 (USA) or 15Z70 (Canada), is used as directed through the floor joists and into the crawl space. See the following figures. Exhaust from Furnace To Termination Consult the vent tables for vent lengths and approved materials.
4. Condensate Piping This unit is designed for either right or left side exit of condensate piping in upflow applications. In horizontal applications, the condensate trap must extend below the unit. An 8” service clearance is required for the condensate trap. Refer to Figure 52 and Figure 53 for condensate trap locations. Figure 58 shows trap assembly using 1/2” PVC or 3/4” PVC. Install drain trap using appropriate PVC fittings, glue all joints. Glue the provided drain trap as shown in Figure 58.
* Piping from furnace must slope down a minimum of 1/4” per ft. toward trap. Figure 54. Evaporator Coil Using a Separate Drain (Unit shown in horizontal right-hand discharge position) Figure 55. Evaporator Coil Using a Separate Drain Figure 56. Evaporator Coil Using a Common Drain * Piping from furnace must slope down a minimum of 1/4” per ft. toward trap. Figure 57.
Figure 58.
2. When connecting gas supply, factors such as length of run, number of fittings and furnace rating must be considered to avoid excessive pressure drop. Table 9 list recommended pipe sizes for typical applications. NOTE: Use two wrenches when connecting gas piping to avoid transferring to the manifold. Figure 59. Condensate Trap with Optional Overflow Switch Gas Piping 3. Gas piping must not run in or through air ducts, clothes chutes, chimneys or gas vents, dumb waiters or elevator shafts.
IMPORTANT WARNING When testing pressure of gas lines, gas valve must be disconnected and isolated. See Figure 60. Gas valves can be damaged if subjected to pressures greater than 1/2 psig (3.48 kPa). FIRE OR EXPLOSION HAZARD Failure to follow the safety warnings exactly could result in serious injury, death, or property damage. Never use an open flame to test for gas leaks. Check all connections using a commercially available soap solution made specifically for leak detection.
Gas Pipe Capacity - FT³/HR (kL/HR) Nominal Iron Pipe Size inches (mm) Internal Diameter - inches (mm) Length of Pipe - feet (m) 10 20 30 (3.048) (6.096) (9.144) 40 50 60 70 80 90 100 (12.192) (15.240) (18.288) (21.336) (24.384) (27.432) (30.480) 1/2 .622 175 120 97 82 73 66 61 57 53 50 (12.7) (17.799) (4.96) (3.40) (2.75) (2.32) (2.07) (1.87) (1.73) (1.61) (1.50) (1.42) 3/4 .824 360 250 200 170 151 138 125 118 110 103 (19.05) (20.930) (10.19) (7.
Electrical ELECTROSTATIC DISCHARGE (ESD) Precautions and Procedures CAUTION Electrostatic discharge can affect electronic components. Take precautions during furnace installation and service to protect the furnace’s electronic controls. Precautions will help to avoid control exposure to electrostatic discharge by putting the furnace, the control and the technician at the same electrostatic potential.
use an external relay. See Figure 69 for control board configuration. This terminal is energized in the heating mode when the combustion air inducer is operating. Install the room thermostat according to the instructions provided with the thermostat. See Figure 65 for thermostat designations. If the furnace is being matched with a heat pump, refer to the FM21 installation instruction or appropriate dual fuel thermostat instructions. Indoor Blower Speeds 1.
Figure 67.
Terminal Designations HUM Humidifier (120 VAC) LINE Input (120 VAC) XFMR EAC Transformer (120 VAC) Electronic Air Cleaner (120 VAC) COOL Blower - Cooling Speed (120 VAC) HEAT Blower - Heating Speed (120 VAC) PARK Dead terminals to park alternate speed taps NEUTRALS Neutral terminals (120 VAC) Figure 69.
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: 8. Move gas valve switch to ON. See Figure 70. 9. Replace the upper access panel. 10. Turn on all electrical power to the unit. 11. Set the thermostat to desired setting. NOTE: When unit is initially started, steps 1 through 11 may need to be repeated to purge air from gas line.
Gas Pressure Adjustment Gas Flow (Approximate) Seconds for One Revolution Capacity Natural 2. Start unit and allow 5 minutes for unit to reach steady state. 3. While waiting for the unit to stabilize, observe the flame. Flame should be stable and should not lift from burner. Natural gas should burn blue. 4. After allowing unit to stabilize for 5 minutes, record manifold pressure and compare to value given in Table 12.
Burner Orifice Conversion Kits at Varying Altitudes 0 - 7,500 ft (0 - 2,286 m) Capacity 7,501 - 10,000 ft (2,286 - 3,048 m) Natural to LP/ Propane LP/Propane to Natural High Altitude Natural Burner Orifice Kit High Altitude LP/Propane Burner Orifice Kit 11K50+ 73W80* 51W01 11K45+ All * Conversion requires installation of a gas valve regulator spring which is provided with the gas conversion Kit. + LP Kits include low line pressure switch.
Testing for Proper Venting and Sufficient Combustion Air for Non-Direct Vent Applications 1. Seal any unused openings in the venting system. 2. Failure to follow the steps outlined below for each appliance connected to the venting system being placed into operation could result in carbon monoxide poisoning or death. Visually inspect the venting system for proper size and horizontal pitch.
Thermostat Heat Anticipation Other Unit Adjustments Set the heat anticipator setting (if adjustable) according to the amp draw listed on the wiring diagram that is attached to the unit. Primary Limit The primary limit is located on the heating compartment vestibule panel. This limit is factory set and requires no adjustment. Flame Rollout Switches (Two) These manually reset switches are located on the front of the burner box. These limits are factory set and require no adjustment.
Blower Performance A93UH1D / 92G1UH A93UH1D / 92G1UH 045*B08 Performance (Less Filter) External Static Pressure in. w.c. Air Volume / Watts at Various Blower Speeds High cfm Medium-High Watts cfm Watts Medium-Low cfm Watts Low cfm Watts 0.00 1140 455 920 365 765 295 710 265 0.10 1135 445 900 360 765 290 690 255 0.20 1125 430 895 350 755 285 680 255 0.30 1090 415 870 340 725 280 660 250 0.40 1065 405 870 325 715 270 635 245 0.
A93UH1D / 92G1UH 070*B12 Performance (Less Filter) External Static Pressure in. w.c. Air Volume / Watts at Various Blower Speeds High cfm Medium-High Watts cfm Watts Medium-Low cfm Watts Low cfm Watts 0.00 1615 680 1355 570 1140 480 1030 400 0.10 1565 660 1365 545 1150 465 1020 385 0.20 1535 630 1340 525 1150 440 1025 375 0.30 1440 600 1300 500 1110 420 1000 350 0.40 1405 570 1255 470 1075 400 975 345 0.50 1340 535 1200 445 1045 380 945 330 0.
A93UH1D / 92G1UH 110*C16 Performance (Less Filter) External Static Pressure in. w.c. Air Volume / Watts at Various Blower Speeds High cfm Medium-High Watts cfm Medium-Low Watts cfm Low Watts cfm Watts 0.00 2030 905 1750 805 1425 665 1225 530 0.10 1950 865 1755 770 1430 630 1215 515 0.20 1935 840 1675 735 1455 610 1230 505 0.30 1885 810 1660 685 1410 585 1200 485 0.40 1830 780 1585 645 1385 570 1190 470 0.
Blower Performance A95UH1D / 95F1UHD A95UH1D / 95G1UH 070*B12 Performance (Less Filter) External Static Pressure in. w.c. Air Volume / Watts at Various Blower Speeds High cfm Medium-High Watts cfm Watts Medium-Low cfm Watts Low cfm Watts 0.00 1585 685 1340 585 1095 480 880 380 0.10 1560 665 1320 565 1085 470 885 375 0.20 1515 630 1300 540 1080 460 880 370 0.30 1465 590 1275 520 1065 440 890 360 0.40 1410 570 1235 490 1050 420 875 350 0.
A95UH1D / 95G1UH 110*C20 Performance (Less Filter) Air Volume / Watts at Various Blower Speeds External Static Pressure in. w.c. Bottom Return Air, Side Return Air with Optional Return Air Base, Return Air from Both Sides or Return Air from Bottom and One Side. High Single Side Return Air - Air volumes in bold require field fabricated transition to accommodate 20 x 25 x 1 in. air filter in order to maintain proper air velocity.
Winterizing and Condensate Trap Care Service WARNING ELECTRICAL SHOCK, FIRE, OR EXPLOSION HAZARD. 1. Turn off power to the furnace. 2. Have a shallow pan ready to empty condensate water. 3. Remove the clean out cap from the condensate trap and empty water. Inspect the trap then reinstall the clean out cap. Cleaning Heat Exchanger Failure to follow safety warnings exactly could result in dangerous operation, serious injury, death or property damage.
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 tilted upward to allow clearance for removing heat exchanger. 42. Reconnect sensor wire and reconnect 2 pin plug from ignitor. 21. Remove two screws from the front cabinet flange at the blower deck. Spread cabinet sides slightly to allow clearance for removal of heat exchanger. 44. Replace the blower compartment access panel. 22.
Planned Service A service technician should check the following items during an annual inspection. Power to the unit must be shut off for safety. Problems detected during the inspection may make it necessary to temporarily shut down the furnace until the items can be repaired or replaced. Fresh air grilles and louvers (on the unit and in the room where the furnace is installed) - Must be open and unobstructed to provide combustion air. Instruct the homeowners to pay attention to their furnace.
Requirements for Commonwealth of Massachusetts Modifications to NFPA-54, Chapter 10 4. Revise NFPA-54 section 10.8.
