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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 .........................7
Installation .................................................................10
Filters .........................................................................13
Duct System ..............................................................13
Venting Practices .......................................................16
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
Allied Air Enterprises LLC
A Lennox International, Inc. Company
215 Metropolitan Drive
West Columbia, SC 29170
507867-02
INSTALLATION INSTRUCTIONS
A93UH1E & 92G1UHE
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
Condensate Piping ....................................................33
Gas Piping .................................................................36
Electrical ....................................................................39
Unit Start-Up ..............................................................42
Air for Non-Direct Vent Applications ..........................46
Other Unit Adjustments..............................................46
Blower Performance A93UH1E & 92G1UHE ............48
Service.......................................................................51
Planned Service ........................................................54
Repair Parts List ........................................................54
As with any mechanical equipment, personal injury can
result from contact with sharp sheet metal edges. Be
careful when you handle this equipment.
Issue 1922
CAUTION
*P507867-02*
(P) 507867-02
Page 1 of 55
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Summary of Contents for Lennox Allied Air A93UH1E
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Page 1: Table Of Contents
Manufactured By *P507867-02* Allied Air Enterprises LLC A Lennox International, Inc. Company 215 Metropolitan Drive (P) 507867-02 West Columbia, SC 29170 Save these instructions for future reference... -
Page 2: Unit Dimensions
Unit Dimensions 1 NOTE - 20C (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: Single side return air with transition, to accommodate 20 x 25 x 1 in. -
Page 3: Parts Arrangement
Parts Arrangement Top Cap Flexible No-HJB Burner Box Exhaust Collar Assembly Heat Exchanger Assembly Gas Valve Combustion Air Inducer Cabinet Bag Assemblies Combustion Air Pressure Prove Switch Blower Assembly Cold End Blower Header Box Access Door Control Box (includes integrated ignition control, transformer and interlock switch) Figure 1. -
Page 4: Gas Furnace
Gas Furnace Shipping and Packing List The A93UH1E & 92G1UHE Category IV gas furnace is 1 - Assembled Gas Furnace shipped ready for installation in the upflow or horizontal 1 - Bag assembly containing the following: position. The furnace is shipped with the bottom panel in place. - Page 5 Building Codes When installed, this furnace must be electrically grounded according to local codes. In addition, in the United States, In the USA, installation of gas furnaces must conform with installation must conform with the current National local building codes. In the absence of local codes, units Electric Code, ANSI/NFPA No.
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Page 6: General
Use of Furnace as a Construction Heater NOTWITHSTANDING THE FOREGOING, INSTALLER IS RESPONSIBLE FOR CONFIRMING THAT THE USE Units may be used for heating of buildings or structures OF CONSTRUCTION HEAT IS CONSISTENT WITH under construction, if the following conditions are met to THE POLICIES AND CODES OF ALL REGULATING ensure proper operation. -
Page 7: Combustion, Dilution & Ventilation Air
of this information has been reprinted with permission from Combustion, Dilution & Ventilation Air the National Fuel Gas Code (ANSI-Z223.1/NFPA 54). This reprinted material is not the complete and official position If this unit is installed as a Non-Direct Vent Furnace, follow of ANSI on the referenced subject, which is represented the guidelines in this section. - Page 8 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.
- Page 9 Ventilation Louvers Inlet Air Roof Terminated (Minimum 12 in. Exhaust Pipe (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 mm 1.17 kW) per hour of the total input rating of all equipment in the enclosure.
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Page 10: Installation
Allow for clearances to combustible materials as indicated Installation on the unit nameplate. Setting Equipment WARNING Improper installation of the furnace can result in WARNING personal injury or death. Combustion and flue products Do not connect the return air ducts to the back of the must never be allowed to enter the return air system or furnace. - Page 11 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”.
- Page 12 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. Top/Plenum 1 in.
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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 unit operates properly and safely. Use fiberglass sealing the 90° elbow or reducing 90° elbow to the flue collar. In strips, caulking, or equivalent sealing method between the addition, the first three feet of vent pipe from the furnace plenum and the furnace cabinet to ensure a tight seal. If flue collar must be accessible for inspection.
- Page 15 STANDARD CONCENTRIC Outdoor Outdoor Exhaust 1-1/2” 2” 3” Exhaust Flush Accelerator Concentric Concentric Concentric VENT Accelerator Mount Kit Capacity PIPE DIA. (Dia. X Length) (Dia. X Length) (in.) 71M80 69M29 60L46 1-1/2” X 12” 2” X 12” 51W11 ** or 44W93+ +44W92++ +44W92++ 1-1/2...
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Page 16: Venting Practices
Removal of the Furnace from Common Vent during assembly (but not after pipe is fully inserted) to distribute cement evenly. Do not turn ABS or cellular In the event that an existing furnace is removed from core pipe. a venting system commonly run with separate gas appliances, the venting system is likely to be too large to NOTE: Assembly should be completed within 20 properly vent the remaining attached appliances. - Page 17 After determining that each appliance connected to Regardless of the diameter of pipe used, the standard roof the common venting system is venting properly, (step and wall terminations described in section Exhaust Piping 3) return all doors, windows, exhaust fans, fireplace Terminations should be used.
- Page 18 IMPORTANT Do not use screens or perforated metal in exhaust or intake terminations. Doing so will cause freeze-ups and may block the terminations. Use Figure 24 to correctly size vent pipe diameter. 030, 045, Furnace capacity? 070, 090, Standard or Which termination? Concentric? See Table 3...
- Page 19 A93UH1E & 92G1UHE Maximum Allowable Intake or Exhaust Vent Length in Feet Standard Termination at Elevation 0 - 10,000 ft 1-1/2" Pipe 2" Pipe 2-1/2" Pipe 3" Pipe Number of Capacity Capacity Capacity Capacity 90° Elbows Used 030 / 030 / 030 / 030 / Concentric Termination Elevation 0 - 10,000 ft...
- Page 20 A93UH1E & 92G1UHE 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 1-1/2" Pipe 2" Pipe 2-1/2" Pipe 3"...
- Page 21 TYPICAL EXHAUST PIPE CONNECTIONS IN HORIZONTAL DIRECT OR NON-DIRECT VENT APPLICATIONS (RIGHT-HAND DISCHARGE SHOWN) NOTE: 1-1/2” Vent Pipe Diameter Allowed Only on 030/045/070 Units 12” max. 2” 1-1/2” 2” 3” TRANSITION TRANSITION 2” **2” 2” 2” *2” **2” *2” EXHAUST EXHAUST EXHAUST 45°...
- Page 22 TYPICAL INTAKE PIPE CONNECTIONS IN HORIZONTAL DIRECT OR NON-DIRECT VENT APPLICATION (RIGHT-HAND DISCHARGE SHOWN) 2” 1-1/2” 2” 3” TRANSITION TRANSITION 2” 2” 2” **2” *2” *2” **2” INTAKE * When transitioning up in pipe size, use the shortest length of 2” PVC pipe possible. ** When transitioning down in pipe size, use at least 1 foot of 2"...
- Page 23 If intake air is drawn from a ventilated attic (Figure 31) or ventilated crawlspace (Figure 32) the exhaust CAUTION vent length must not exceed those listed in Table 6. If 3” diameter pipe is used, reduce to 2” diameter pipe If this unit is being installed in an application with at the termination point to accommodate the debris combustion air coming in from a space serviced by an...
- Page 24 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. In Direct Vent applications, combustion air is taken from Conditioned outdoors and the flue gases are discharged to the outdoors.
- Page 25 VENT TERMINATION CLEARANCES FOR NON-DIRECT VENT INSTALLATIONS IN THE US AND CANADA INSIDE CORNER DETAIL Fixed Operable Fixed Closed Closed Operable AREA WHERE TERMINAL AIR SUPPLY INLET VENT TERMINAL IS NOT PERMITTED US Installations Canadian Installations Clearance above grade, veranda, 12 inches (305mm) or 12 in.
- Page 26 VENT TERMINATION CLEARANCES FOR DIRECT VENT INSTALLATIONS IN THE USA AND CANADA INSIDE CORNER DETAIL Fixed Operable Fixed Closed Closed Operable AREA WHERE TERMINAL AIR SUPPLY INLET VENT TERMINAL IS NOT PERMITTED US Installations Canadian Installations Clearance above grade, veranda, 12 inches (305mm) or 12 in.
- Page 27 Details of Intake and Exhaust Piping In both Non–Direct Vent and Direct Vent applications, the vent termination is limited by local building codes. In the Terminations for Direct Vent Installations absence of local codes, refer to the current National Fuel NOTE: In Direct Vent installations, combustion air is taken Gas Code ANSI Z223-1/NFPA 54 in U.S.A., and current from outdoors and flue gases are discharged to outdoors.
- Page 28 On field supplied terminations for sidewall exit, exhaust 3” (76MM) MIN. SIZE PER EXHAUST PIPE piping may extend a maximum of 12 inches (305 mm) Inches (MM) TERMINATION SIZE for 2” PVC and 20 inches (508 mm) for 3” (76 mm) REDUCTION TABLE PVC beyond the outside wall.
- Page 29 1 1/2” (38mm) accelerator provided on 71M80 & 44W92 EXHAUST VENT FLASHING 12” (305mm) INTAKE (Not Furnished) Minimum Above Average Snow Accumulation SHEET METAL STRAP (Clamp and sheet metal strap must be field installed to support the weight of the termination kit.) CLAMP FIELD-PROVIDED REDUCER MAY BE REQUIRED...
- Page 30 FIELD FABRICATED WALL TERMINATION NOTE − FIELD−PROVIDED REDUCER MAY BE REQUIRED TO ADAPT 2” (51mm) 3” (76mm) 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 Details of Exhaust Piping Terminations for Non- Direct 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 SIZE TERMINATION PER EXHAUST PIPE is preferred.
- Page 32 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. Ensure a vent Furnace pipe drain kit, 51W18 (USA) or 15Z70 (Canada), is used as To Termination directed through the floor joists and into the crawl space.
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Page 33: Condensate Piping
Install drain trap using appropriate PVC fittings, glue Condensate Piping all joints. Glue the provided drain trap as shown in Figure 58. Route the condensate line to an open drain. This unit is designed for either right or left side exit of Condensate line must maintain a 1/4”... - Page 34 * 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”...
- Page 35 Figure 58. Trap / Drain Assembly Using 1/2” PVC or 3/4” PVC 507867-02 Issue 1922 Page 35 of 55...
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Page 36: Gas Piping
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. - Page 37 IMPORTANT WARNING FIRE OR EXPLOSION HAZARD When testing pressure of gas lines, gas valve must be disconnected and isolated. See Figure 60. Gas valves Failure to follow the safety warnings exactly could can be damaged if subjected to pressures greater than result in serious injury, death, or property damage.
- Page 38 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)
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Page 39: Electrical
Refer to Figure 66 for field wiring and Figure 67 for Electrical schematic wiring diagram and troubleshooting. The power supply wiring must meet Class I restrictions. ELECTROSTATIC DISCHARGE (ESD) Protected by either a fuse or circuit breaker, select circuit protection and wire size according to unit nameplate. Precautions and Procedures NOTE: Unit nameplate states maximum current draw. - Page 40 Indoor Blower Speeds the circuit connected to ground or the “C” terminal. See Figure 68 for control board configuration. This terminal is When the thermostat is set to “FAN ON”, the indoor energized in the heating mode when the combustion air blower will run continuously on the heating speed inducer is operating.
- Page 41 Figure 67. Typical Wiring Diagram 507867-02 Issue 1922 Page 41 of 55...
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Page 42: 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 43 Priming Condensate Trap Move gas valve switch to ON. See Figure 69. The condensate trap should be primed with water prior Replace the upper access panel. to start-up to ensure proper condensate drainage. Either 10. Turn on all electrical power to the unit. pour 10 fl.
- Page 44 Gas Pressure Adjustment Start unit and allow 5 minutes for unit to reach steady state. Gas Flow (Approximate) While waiting for the unit to stabilize, observe the Seconds for One Revolution flame. Flame should be stable and should not lift from Natural burner.
- Page 45 Burner Orifice Conversion Kits at Varying Altitudes 0 - 7,500 ft 7,501 - 10,000 ft (0 - 2,286 m) (2,286 - 3,048 m) Capacity High Altitude High Altitude Natural to LP/ LP/Propane to Natural Burner LP/Propane Burner Propane Natural Orifice Kit Orifice Kit 17H62+ 17H90...
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Page 46: 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 47 Blower Speeds speed to maintain the temperature rise within the range shown on the unit nameplate. See Table 14 for allowable Follow the steps below to change the blower speeds. heating speeds. Increase the blower speed to decrease Turn off electrical power to furnace. the temperature.
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Page 48: Blower Performance A93Uh1E & 92G1Uhe
Blower Performance A93UH1E & 92G1UHE A93UH1E030B12A / 92G1UH030BE12 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. 0.10 1400 1130 0.20 1360 1085 0.30 1325 1055 0.40... - Page 49 A93UH1E090C12A / 92G1UH090CE12 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. 0.10 1375 1315 1125 0.20 1340 1285 1090 0.30 1310 1260 1055 0.40 1275 1225...
- Page 50 Page 50 of 55 Issue 1922 507867-02...
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Page 51: Service
Allowable Heating Speeds Model Yellow Blue Brown Black 030-12 Allowed Factory Setting Allowed Allowed Not Allowed 045-12 Allowed Factory Setting Allowed Allowed Not Allowed 070-12 Not Allowed Allowed Factory Setting Allowed Not Allowed 090-12 Not Allowed Not Allowed Allowed Factory Setting Not Allowed 090-16 Not Allowed... - Page 52 Cleaning Heat Exchanger 21. Remove two screws from the front cabinet flange at the blower deck. Spread cabinet sides slightly to allow If cleaning the heat exchanger becomes necessary, clearance for removal of heat exchanger. follow the below procedures and refer to Figure 1 when disassembling unit.
- Page 53 43. Reconnect wires to gas valve. Gently clean the face of the burners using the soft brush attachment on a vacuum cleaner. Visually 44. Replace the blower compartment access panel. inspect the inside of the burners and crossovers for 45. Refer to instruction on verifying gas and electrical any blockage caused by foreign matter.
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Page 54: Planned Service
Planned Service A service technician should check the following items Operating performance - Unit must be observed during during an annual inspection. Power to the unit must be operation to monitor proper performance of the unit and shut off for safety. the vent system. - Page 55 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...