INSTALLATION INSTRUCTIONS A95UH, A93UH, 95G1UH & 92G1UH 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. WARNING CAUTION Improper installation, adjustment, alteration, service or maintenance can cause property damage, personal injury or loss of life.
A95UH, A93UH, 95G1UH & 92G1UH Unit Dimensions - inches (mm) 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. 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.) 2. Single side return air with optional “RAB” Return Air Base. 3. Bottom return air. 4. Return air from both sides. 5.
EXPANDED VIEW Figure 1 506724-01 Issue 1108 Page 3 of 57
A95UH, A93UH, 95G1UH &92G1UH Gas Furnace The A95UH/A93UH/95G1UH & 92G1UH 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. Safety Information WARNING Improper installation, adjustment, alteration, service or maintenance can cause property damage, personal injury or loss of life.
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 10. Accessibility and service clearances must take precedence over fire protection clearances.
• • • • • • Air filters must be installed in the system and must be maintained during construction. Air filters must be replaced upon construction completion. The input rate and temperature rise must be set per the furnace rating plate. One hundred percent (100%) outdoor air must be provided for combustion air requirements during construction. Temporary ducting may supply outdoor air to the furnace. Do not connect duct directly to the furnace.
air is brought into the house for combustion, negative pressure (outside pressure is greater than inside pressure) will build to the point that a down draft can occur in the furnace vent pipe or chimney. As a result, combustion gases enter the living space creating a potentially dangerous situation. In the absence of local codes concerning air for combustion and ventilation, use the guidelines and procedures in this section to install these furnaces to ensure efficient and safe operation.
Air from Outside If air from outside is brought in for combustion and ventilation, the confined space shall be provided with two permanent openings. One opening shall be within 12” (305 mm) of the top of the enclosure and one within 12” (305 mm) of the bottom. These openings must communicate directly or by ducts with the outdoors or spaces (crawl or attic) that freely communicate with the outdoors or indirectly through vertical ducts.
Shipping Bolt Removal Units with 1/2 hp blower motor are equipped with three flexible legs and one rigid leg. The rigid leg is equipped with a shipping bolt and a flat white plastic washer (rather than the rubber mounting grommet used with a flexible mounting leg). See Figure 8. The bolt and washer must be removed before the furnace is placed into operation. After the bolt and washer have been removed, the rigid leg will not touch the blower housing.
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. In platform installations with furnace return, the furnace should be sealed airtight to the return air plenum. A door must never be used as a portion of the return air duct system.
Optional Return Air Base (Upflow Applications Only) CONDENSATE TRAP FURNACE FRONT INDOOR AIR QUALITY CABINET (PCO, Filter Cabinet, etc.
Horizontal Application Installation Clearances Typical Horizontal Application Right−Hand Discharge L e ft E n d R ight E nd Air Flow Air Flow Bottom (Floor)** Left−Hand Discharge Top L e ft E n d R ight E nd Figure 16 Air Flow Air Flow Bottom (Floor)** Top 0 Front* 0 Back 0 Ends 0 Vent 0 Floor 0‡ NOTE: Heavy-gauge sheet metal straps may be used to suspend the unit from roof rafters or ceiling joists.
Duct System Use industry approved standards to size and install the supply and return air duct system. This will result in a quiet and low-static system that has uniform air distribution. INTAKE PIPE EXHAUST PIPE *GAS CONNECTOR *Gas connector may be used for Canadian installation if acceptable by local authority having jurisdiction. NOTE: This furnace is not certified for operation in heating mode (indoor blower operating at selected heating speed) with an external static pressure which exceeds 0.
CAUTION IMPORTANT Solvent cements for plastic pipe are flammable liquids and should be kept away from all sources of ignition. Do not use excessive amounts of solvent cement when making joints. Good ventilation should be maintained to reduce fire hazard and to minimize breathing of solvent vapors. Avoid contact of cement with skin and eyes.
OUTDOOR TERMINATION KITS USAGE STANDARD A95UH A93UH 95G1UH 92G1UH 045 070 090 110 135 VENT PIPE DIA. (in.) CONCENTRIC Outdoor Exhaust Accelerator (Dia. X Length) Outdoor Exhaust Accelerator (Dia.
6. Promptly apply solvent cement to end of pipe and inside socket surface of fitting. Cement should be applied lightly but uniformly to inside of socket. Take care to keep excess cement out of socket. Apply second coat to end of pipe. 7. Immediately after applying last coat of cement to pipe, and while both inside socket surface and end of pipe are wet with cement, forcefully insert end of pipe into socket until it bottoms out.
Vent Piping Guidelines This gas furnace can be installed as either a Non-Direct Vent or a Direct Vent gas central furnace. Use the following steps to correctly size vent pipe diameter. NOTE: In non-Direct Vent installations, combustion air is taken from indoors and flue gases are discharged outdoors. In Direct Vent installations, combustion air is taken from outdoors and flue gases are discharged outdoors.
A93UH and 92G1UH Maximum Allowable Intake or Exhaust Vent Length in Feet *Size intake and exhaust pipe length separately. Values in table are for Intake OR Exhaust, not combined total. Both Intake and Exhaust must be same pipe size.
A95UH and 95G1UH Maximum Allowable Intake or Exhaust Vent Length in Feet *Size intake and exhaust pipe length separately. Values in table are for Intake OR Exhaust, not combined total. Both Intake and Exhaust must be same pipe size.
TYPICAL EXHAUST PIPE CONNECTIONS IN UPFLOW DIRECT OR NON−DIRECT VENT APPLICATIONS Pipe size determined in table 5 2” 2” 2” 3” 2” or 2” or TRANSITION EXHAUST *2” DO NOT transition from smaller to larger pipe in horizontal runs of exhaust pipe. * When transitioning up in pipe size, use the shortest length of 2” PVC pipe possible. NOTE − Exhaust pipe and intake pipe must be the same diameter.
TYPICAL AIR INTAKE PIPE CONNECTIONS IN UPFLOW DIRECT VENT APPLICATIONS Pipe size determined in table 5 2” or 3” TRANSITION AIR INTAKE *2” 2” 2” 2” or 2” * When transitioning up in pipe size, use the shortest length of 2” PVC pipe possible. NOTE − Intake and exhaust pipe must be the same diameter.
1. 2. Use transition solvent cement or a sheet metal screw to secure the intake pipe to the inlet air connector. Route piping to outside of structure. Continue with installation following instructions given in general guide lines for piping terminations and in intake and exhaust piping terminations for direct vent sections. Refer to Table 5 for pipe sizes.
Follow the next two steps when installing the unit in Non– Direct Vent applications where combustion air is taken from indoors and flue gases are discharged outdoors. 1. Use field-provided materials and the factory-provided air intake screen to route the intake piping as shown in figure 26 or 27. Maintain a minimum clearance of 3" (76 mm) around the air intake opening.
VENT TERMINATION CLEARANCES FOR NON−DIRECT VENT INSTALLATIONS IN THE USA AND CANADA INSIDE CORNER DETAIL G H A D E B L Fixed Closed Operable Fixed Closed Operable F B B C I M B K J A B AREA WHERE TERMINAL IS NOT PERMITTED AIR SUPPLY INLET VENT TERMINAL US Installations 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 term
VENT TERMINATION CLEARANCES FOR DIRECT VENT INSTALLATIONS IN THE USA AND CANADA INSIDE CORNER DETAIL G H A D E B L I Fixed Closed Operable Fixed Closed Operable F B B C M B K J A B US Installations 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 within a horizontal distance of 2 feet (mm) from the center line of t
Details of Intake and Exhaust Piping Terminations for Direct Vent Installations EXHAUST PIPE TERMINATION SIZE REDUCTION MODEL *045 and 070 *090 110 135 NOTE: In Direct Vent installations, combustion air is taken from outdoors and flue gases are discharged to outdoors. NOTE: Flue gas may be slightly acidic and may adversely affect some building materials.
FIELD SUPPLIED WALL TERMINATION NOTE − FIELD PROVIDED REDUCER MAY BE REQUIRED TO ADAPT LARGER VENT PIPE SIZE TO TERMINATION 1/2" (13mm) ARMAFLEX INSULATION IN UNCONDITIONED SPACE ((IF REQUIRED) SIZE TERMINATION PER TABLE 6 D B C STRAIGHT APPPLICATION A 1/2" (13mm) ARMAFLEX INSULATION IN UNCONDITIONED SPACE (IF REQUIRED) D E * WALL SUPPORT B A C EXTENDED APPLICATION See venting table 5 for maximum venting lengths with this arrangement. * Use wall support every 24" (610 mm).
B B D D C Intake C 3 1 Front View of Intake and Exhaust A Exhaust A 2 Intake Exhaust D TABLE 7 1 E B A − Clearance above grade or average snow accumulation 12" C 2 A B −Horizontal separation between intake and exhaust C −Minimum from end of exhaust to inlet of intake D−Exhaust pipe length E −Wall support distance from top of each pipe (intake/exhaust) 2" (51mm) Vent Pipe 3" (76mm) Vent Pipe 12" (508MM) Min. 12" (508MM) Min. 6" (152MM) Min. 24" (610 MM) Max 6" (152MM) Min.
FIELD SUPPLIED WALL TERMINATION NOTE − FIELD PROVIDED REDUCER MAY BE REQUIRED TO ADAPT LARGER VENT PIPE SIZE TO TERMINATION 1/2" (13mm) ARMAFLEX INSULATION IN UNCONDITIONED SPACE (IF REQUIRED) SIZE TERMINATION PER TABLE 6 D B STRAIGHT APPPLICATION C A 1/2" (13mm) ARMAFLEX INSULATION IN UNCONDITIONED SPACE (IF REQUIRED) D E * WALL SUPPORT 5.
DIRECT VENT APPLICATION USING EXISTING CHIMNEY DIRECT VENT CONCENTRIC ROOFTOP TERMINATION 71M80, 69M29 or 60L46 (US) 44W92 or 44W93 (Canada) 1 1/2" (38mm) accelerator provided on 71M80 & 44W92 EXHAUST VENT 12” (305mm) 8" − 12" (203mm − 305mm) FLASHING (Not Furnished) INTAKE AIR Minimum Above Average Snow Accumulation 3"−8" (76mm−203mm) Minimum 12" (305MM) above chimney top plate or average snow accumulation INTAKE PIPE INSULATION (optional) EXHAUST VENT 1/2" (13mm) WEATHERPROOF INSULATION SHOULD
NON−DIRECT VENT FIELD SUPPLIED WALL TERMINATION EXTENDED NON−DIRECT VENT ROOF TERMINATION KIT (15F75 or 44J41) 12" (305mm) ABOVE AVE. SNOW ACCUMULATION SIZE TERMINATION PIPE PER TABLE 6. 12" (305mm) MAX. for 2" (51mm) 20" (508mm) MAX. for 3" (76mm) UNCONDITIONED SPACE 1/2" (13mm) FOAM INSULATION IF REQUIRED 6" (152mm) Max SIZE TERMINATION PIPE PER TABLE 6.
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 43 for condensate trap locations. CONDENSATE TRAP AND PLUG LOCATIONS (Unit shown in upflow position) Trap (same on right side) 1−1/2 in.
Condensate line must slope downward away from the trap to drain. If drain level is above condensate trap, condensate pump must be used. Condensate drain line should be routed within the conditioned space to avoid freezing of condensate and blockage of drain line. If this is not possible, a heat cable kit may be used on the condensate trap and line. Heating cable kit is available in various lengths; 6 ft. (1.8 m) - kit no. 26K68; 24 ft. (7.3 m) - kit no. 26K69; and 50 ft. (15.2 m) - kit no. 26K70.
TRAP / DRAIN ASSEMBLY USING 1/2" PVC OR 3/4" PVC OPTIONAL Condensate Drain Connection Adapter 1/2 inch slip X 1/2 inch mpt (Not Furnished) Adapter 1/2 inch slip X 1/2 inch mpt (Not Furnished) Vent 90° Street Elbow 1/2 inch PVC (Not Furnished) 1 (25) Minimum Condensate Drain Connection In Unit 5 Feet Maximum Above Top of Condensate Drain Connection In Unit 90° Elbow 1/2 inch PVC (Not Furnished) Condensate Drain Connection In Unit OPTIONAL Drain Piping 1/2 inch PVC Pipe (Not Furnished) 1/2 inch PV
6. In some localities, codes may require installation of a manual main shut-off valve and union (furnished by installer) external to the unit. Union must be of the ground joint type. Gas Piping CAUTION If a flexible gas connector is required or allowed by the authority that has jurisdiction, black iron pipe shall be installed at the gas valve and extend outside the furnace cabinet. The flexible connector can then be added between the black iron pipe and the gas supply line.
Left Side Piping (Standard) Right Side Piping (Alternate) Bellows Grommet MANUAL MAIN SHUT−OFF VALVE Plug MANUAL MAIN SHUT−OFF VALVE Plug GROUND JOINT UNION GROUND JOINT UNION DRIP LEG Bellows Grommet NOTE − BLACK IRON PIPE DRIP LEG Gas Valve Gas Valve FIELD PROVIDED AND INSTALLED ONLY TO BE ROUTED INSIDE OF CABINET FIGURE 49 Horizontal Applications Possible Gas Piping Configurations MANUAL MAIN SHUT−OFF VALVE MANUAL MAIN SHUT−OFF VALVE Horizontal Application Left−Side Air Discharge GROUND
GAS PIPE CAPACITY − FT 3 /HR (kL/HR) Length of Pipe−Feet(m) 50 60 (15.240) (18.288) Nominal Iron Pipe Size −Inches(mm) Internal Diameter −Inches(mm) 10 (3.048) 20 (6.096) 30 (9.144) 40 (12.192) 1/2 (12.7) .622 (17.799) 175 (4.96) 120 (3.40) 97 (2.75) 82 (2.32) 73 (2.07) 3/4 (19.05) .824 (20.930) 360 (10.19) 250 (7.08) 200 (5.66) 170 (4.81) 1 (25.4) 1.049 (26.645) 680 (19.25) 465 (13.17) 375 (10.62) 1−1/4 (31.75) 1.380 (35.052) 1400 (39.64) 950 (26.90) 1−1/2 (38.1) 1.610 (40.
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.
Indoor Blower Speeds 1. When the thermostat is set to “FAN ON”, the indoor blower will run continuously on the heating speed when there is no cooling or heating demand. 2. When the furnace is running in the heating mode, the indoor blower will run on the heating speed. 3. When there is a cooling demand, the indoor blower will run on the cooling speed. FURNACE and CONDENSING UNIT THERMOSTAT DESIGNATIONS (Refer to specific thermostat and outdoor unit.
TYPICAL WIRING DIAGRAM Figure 55 Page 40 of 57 Issue 1108 506724-01
INTEGRATED CONTROL (Automatic Hot Surface Ignition System) Figure 56 Unit Start-Up FOR YOUR SAFETY READ BEFORE OPERATING CAUTION WARNING Do not use this furnace if any part has been underwater. A flood-damaged furnace is extremely dangerous. Attempts to use the furnace can result in fire or explosion.
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: 1. Follow the lighting instructions to place the unit into operation. 2. Set the thermostat to initiate a heating demand. 3. Allow the burners to fire for approximately 3 minutes. 4. Adjust the thermostat to deactivate the heating demand. 5. Wait for the combustion air inducer to stop.
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 9.
Burner Orifice Conversion Kits at Varying Altitudes 0 - 7,500 ft (0 - 2,286 m) 7,501 - 10,000 ft (2,286 - 3,038 m) Unit Size Natural to LP/Propane LP/Propane to Natural High Altitude Natural Burner Orifice Kit High Altitude LP/Propane Burner Orifice Kit All 68W75*† 73W80* 51W01 68W70*† * Conversion requires installation of a gas valve regulator spring which is provided with the gas conversion kit. † LP kits includes low line pressure switch.
Testing for Proper Venting and Sufficient Combustion Air for Non-Direct Vent Applications WARNING CARBON MONOXIDE POISONING HAZARD 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. The following steps shall be followed for each appliance connected to the venting system being placed into operation, while all other appliances connected to the venting system are not in operation.
Other Unit Adjustments 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. Pressure Switch The pressure switch is located in the heating compartment on the cold end header box.
BLOWER DATA A93UH1D / 92G1UH A93UH1D / 92G1UH 045*08B PERFORMANCE (Less Filter) Air Volume / Watts at Various Blower Speeds External MediumMediumStatic High Low High Low Pressure in. w.g. cfm Watts cfm Watts cfm Watts 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 0.50 1020 390 825 315 675 260 605 235 0.60 945 365 780 300 640 250 555 225 0.
BLOWER DATA A93UH1D / 92G1UH Continued A93UH1D / 92G1UH 110*20C PERFORMANCE (Less Filter) Air Volume / Watts at Different Blower Speeds External Bottom Return Air, Side Return Air with Optional Return Single Side Return Air − Air volumes in bold Static Air Base, Return Air from Both Sides or Return Air from in order to maintain proper air velocity. Pressure Bottom and One Side. High Medium-High Medium-Low Low High Medium-High Medium-Low in. w.g.
BLOWER DATA A95UH1D / 95G1UH A95UH1D / 95G1UH 045*08B PERFORMANCE (Less Filter) Air Volume / Watts at Various Blower Speeds External MediumMediumStatic High Low High Low Pressure cfm Watts cfm Watts cfm Watts cfm Watts in. w.g. 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 0.50 1020 390 825 315 675 260 605 235 0.60 945 365 780 300 640 250 555 225 0.
BLOWER DATA A95UH1D / 95G1UH Continued A95UH1D / 95G1UH 110*20C PERFORMANCE (Less Filter) Air Volume / Watts at Different Blower Speeds External Bottom Return Air, Side Return Air with Optional Return Single Side Return Air − Air volumes in bold Static Air Base, Return Air from Both Sides or Return Air from in order to maintain proper air velocity. Pressure Bottom and One Side. High Medium-High Medium-Low Low High Medium-High Medium-Low in. w.g.
Service Winterizing and Condensate Trap Care 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. WARNING ELECTRICAL SHOCK, FIRE, OR EXPLOSION HAZARD. Failure to follow safety warnings exactly could result in dangerous operation, serious injury, death or property damage.
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. 22. Remove screws along vestibule sides and bottom which secure vestibule panel and heat exchanger assembly to cabinet. Remove two screws from blower rails which secure bottom heat exchanger flange. Remove heat exchanger from furnace cabinet. 23. Back wash heat exchanger with soapy water solution or steam. If steam is used it must be below 275°F (135°C). 24.
PLANNED SERVICE A service technician should check the following items during an annual inspection. Power to the unit must be shut off for safety. DIAGNOSTIC CODES 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. Burners - Must be inspected for rust, dirt, or signs of water. Vent pipe - Must be inspected for signs of water, cracked, damaged or sagging pipe, or disconnected joints.
REPAIR PARTS LIST The following repair parts are available through Allied Air 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.
Start−Up & Performance Check List UNIT SET UP Furnace: Model Number_______________ Serial Number_________________ Line Voltage SUPPLY AIR 2 4 1 GAS SUPPLY LP Propane Gas Natural Gas 3 Piping Connections Tight Leak Tested Flter 2 RETURN AIR 1 Gas Supply Pressure 3 1 DUCT SYSTEM SUPPLY AIR DUCT Sealed Insulated (if necessary) 2 RETURN DUCT INTAKE / EXHAUST PIPE Sealed All Joints Primed and Glued Filter Installed and Clean Terminations Installed Properly Grilles Unobstructed Horizontal Pip
UNIT OPERATION HEATING MODE COOLING MODE 1 2 2% ______ CO PPM_______ COMBUSTION SAMPLE CO 3 INDOOR BLOWER AMPS______ 4 TEMPERATURE RISE 3 INDOOR BLOWER AMPS______ 4 TEMPERATURE DROP Return Duct Temperature _________ _ _______ Supply Duct Temperature Temperature Drop = _________ TOTAL EXTERNAL STATIC (dry coil) Supply External Static _______ Return External Static + ______ Total External Static = _______ 5 Supply Duct Temperature ________ _ _____ Return Duct Temperature Temperature Rise = _____
REQUIREMENTS for COMMONWEALTH of MASSACHUSETTS Modifications to NFPA-54, Chapter 10 Revise NFPA-54 section 10.8.
