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Allied A97USMV Installation Instructions Manual

Warm air gas furnace upflow/horizontal left and right air discharge
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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.
As with any mechanical equipment, personal injury can
result from contact with sharp sheet metal edges. Be
careful when you handle this equipment.
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.
Unit Dimensions ..................................................................................... 2
Parts Arrangement ................................................................................. 3
Gas Furnace .......................................................................................... 4
Shipping and Packing List ...................................................................... 4
Safety Information .................................................................................. 4
Use of Furnace as a Construction Heater .............................................. 5
General .................................................................................................. 6
Setting Equipment .................................................................................. 6
Filters .................................................................................................... 11
Duct System .......................................................................................... 11
Pipe and Fittings Specifications ............................................................ 12
Joint Cementing Procedure .................................................................. 13
Venting Practices ................................................................................. 14
Vent Piping Guidelines .......................................................................... 15
Gas Piping ............................................................................................. 29
* P 5 0 6 8 8 7 - 0 1 *
(P) 506887-01
506887-01
INSTALLATION INSTRUCTIONS
A97USMV
Warm Air Gas Furnace
This manual must be left with the homeowner for future reference.
CAUTION
WARNING
A thermostat is not included and must be ordered
separately.
• A Comfort Sync
communicating applications.
• In non-communicating applications, a traditional non-
communication thermostat may be used.
In all cases, setup is critical to ensure proper system
operation.
Field wiring for both communicating and non-
communicating applications is illustrated in these
instructions.

TABLE OF CONTENTS

Electrical ............................................................................................... 32
Integrated Control ................................................................................. 41
Blower Motor Performance .................................................................... 46
Unit Start Up ......................................................................................... 57
Gas Pressure Measurement ................................................................. 58
High Altitude Information ...................................................................... 59
Proper Combustion ............................................................................... 59
Other Unit Adjustments ........................................................................ 61
Heating Sequence of Operation ............................................................ 62
Service .................................................................................................. 64
Planned Service .................................................................................... 66
Integrated Control Diagnostic Codes .................................................... 67
Configuring Unit Size Codes ................................................................. 70
Troubleshooting ..................................................................................... 71
Repair Parts List ................................................................................... 77
Issue 1213
NOTICE
TM
thermostat must be used in
Manufactured By
Allied Air Enterprises, Inc.
A Lennox International, Inc. Company
215 Metropolitan Drive
West Columbia, SC 29170
Page 1 of 78

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Questions and answers

Nicholas Rush
April 7, 2025

Is there a recommended platform that pairs with this furnace?

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1 comments:
Mr. Anderson
April 9, 2025

The recommended platform for the Allied A97USMV furnace is one created using cement blocks. It should not be installed directly on carpeting, tile, wood flooring, or other combustible materials.

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Summary of Contents for Allied A97USMV

  • Page 1: Table Of Contents

    Troubleshooting ..................71 Gas Piping ..................... 29 Repair Parts List ................... 77 Manufactured By Allied Air Enterprises, Inc. * P 5 0 6 8 8 7 - 0 1 * A Lennox International, Inc. Company 215 Metropolitan Drive West Columbia, SC 29170...

  • Page 2: Unit Dimensions

    Unit Dimensions - inches (mm) * NOTE - C/D20 size units that require second stage air volumes over 1800 cfm (850 L/S) 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) air filter. 2.

  • Page 3: Parts Arrangement

    A97USMV Exploded View Figure 1 506887-01 Issue 1213 Page 3 of 78...

  • Page 4: Gas Furnace

    A97USMV Gas Furnace Safety Information The A97USMV Category IV gas furnace is equipped with a variable capacity, variable speed integrated control. Each DANGER A97USMV is shipped ready for installation in the upflow, horizontal left air discharge or horizontal right air discharge DANGER OF EXPLOSION! position.

  • Page 5: Use Of Furnace As A Construction Heater

    The A97USMV furnace may be installed in alcoves, closets, With a parallel flow arrangement, a damper (or other means attics, basements, garages, crawl spaces and utility rooms.

  • Page 6: General

    Select a location that allows for the required clearances that Allied Air Enterprises, Inc. are listed on the unit nameplate. Also consider gas supply 215 Metropolitan Drive...

  • Page 7: Setting Equipment

    SETTING EQUIPMENT UNIT MUST BE LEVEL SIDE TO SIDE IN ALL APPLICATIONS FOR PROPER OPERATION. A SLIGHT TILT TOWARD THE DRAIN IS RECOMMENDED FOR PROPER DRAINAGE. TILT THE UNIT SLIGHTLY (MAX. 1/2”) FROM BACK TO FRONT TO AID IN THE DRAINING OF THE HEAT EXCHANGER. Figure 5 506887-01 Issue 1213...
  • Page 8 See Figure 7. Removing the Bottom Panel Figure 6 A97USMV applications which include side return air and a condensate trap installed on the same side of the cabinet Figure 7 (trap can be installed remotely within 5 feet) require either a return air base or field fabricated transition to accommodate an optional IAQ accessory taller than 14.5”.
  • Page 9 NOTE: Units with 1/2 hp blower motor are equipped with Installation Clearances 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).
  • Page 10 Cooling coils Horizontal Applications and supply and return air plenums must be supported The A97USMV furnace can be installed in horizontal separately. applications with either right or left hand air discharge. NOTE: When the furnace is installed on a platform in a Refer to Figure 11 for clearances in horizontal applications.

  • Page 11: Filters

    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. NOTE: Operation of this furnace in heating mode (indoor blower operating at selected heating speed) with an external static pressure which exceeds 0.8 inches w.c.

  • Page 12: Pipe And Fittings Specifications

    Pipe and Fittings Specifications All pipe, fittings, primer and solvent cement must conform CAUTION with American National Standard Institute and the American Society for Testing and Materials (ANSI/ASTM) standards. Solvent cements for plastic pipe are flammable liquids The solvent shall be free flowing and contain no lumps, and should be kept away from all sources of ignition.

  • Page 13: Joint Cementing Procedure

    OUTDOOR TERMINATION KITS USAGE Table 3 Joint Cementing Procedure 6. Promptly apply solvent cement to end of pipe and inside All cementing of joints should be done according to the socket surface of fitting. Cement should be applied specifications outlined in ASTM D2855. lightly but uniformly to inside of socket.

  • Page 14: Venting Practices

    Venting Practices 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. Piping Suspension Guidelines 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.

  • Page 15: Vent Piping Guidelines

    2. Inspect the venting system for proper size and horizontal EXHAUST PIPE pitch. Determine that there is no blockage, restriction, leakage, corrosion, or other deficiencies which could cause an unsafe condition. 3. Close all building doors and windows and all doors between the space in which the appliances remaining connected to the common venting system are located and other spaces of the building.
  • Page 16 Figure 17 Page 16 of 78 Issue 1213 506887-01...
  • Page 17 Maximum Allowable Intake or Exhaust Vent Length (feet) *Size intake exhaust pipe length separately. Values table Intake Exhaust combined total. Both Intake Exhaust must same pipe size. S ta n d a rd T e rm in a tio n a t E le v a tio n 0 - 750 0 f "...
  • Page 18 TYPICAL EXHAUST AND INTAKE PIPE CONNECTIONS IN UPFLOW APPLICATIONS * When transitioning up in pipe size, use the shortest length of 2” PVC pipe possible. Figure 18 TYPICAL EXHAUST AND INTAKE PIPE CONNECTIONS IN HORIZONTAL APPLICATIONS (RIGHT HAND DISCHARGE SHOWN) * When transitioning up in pipe size, use the shortest length of 2”...
  • Page 19 VENT TERMINATION CLEARANCES FOR DIRECT VENT INSTALLATiONS IN THE USA AND CANADA Figure 20 506887-01 Issue 1213 Page 19 of 78...
  • Page 20 General Guidelines for Vent Terminations winter design temperatures below 32°F 0°C). If equired In Direct Vent applications, combustion air is taken from exhaust pipe should be insulated with 1/2" (13mm) Armaflex outdoors and the flue gases are discharged to the outdoors. equivalent.
  • Page 21 Details of Intake and Exhaust Piping Terminations for Direct Vent Installations NOTE: In Direct Vent installations, combustion air is taken from outdoors and flue gases are discharged to outdoors. Intake and exhaust pipes may be routed either horizontally through and outside wall or vertically through the roof. In attic or closet installations, vertical termination through the roof is preferred.
  • Page 22 FIELD SUPPLIED WALL TERMINATION OR See venting Table 5 for maximum venting lengths with this arrangement. * Use wall support every 24” (610 mm). Use two wall supports if extension is greater than 24” (610 mm) but less than 48” (1219 mm). NOTE: One wall support must be 6”...
  • Page 23 EXHAUST PIPE TERMINATION SIZE REDUCTION FIELD SUPPLIED WALL TERMINATION with INTAKE ELBOW * 070 and 090 units installed with flush mount termination must use the 1-1/ 2” accelerator supplied with the kit. Table 7 5. On field supplied terminations for sidewall exit, exhaust piping may extend a maximum of 12 inches (305 mm) for 2”...
  • Page 24 DIRECT VENT CONCENTRIC WAL TERMINATION FLUSH-MOUNT SIDE WALL TERMINATION 71M80, 69M29 OR 60L46 (US) 51W11 44W92 or 44W93 (Canada) Figure 27 Figure 28 Figure 29 Page 24 of 78 Issue 1213 506887-01...
  • Page 25 1. Determine which side condensate piping will exit the DIRECT VENT APPLICATION unit, location of trap, field-provided fittings and length of USING EXISTING CHIMNEY PVC pipe required to reach available drain. 2. Use a 3/8 allen wrench and remove plug (Figure 30) from the cold end header box at the appropriate location on the side of the unit.
  • Page 26 Figure 32 A97USMV With Evaporator Coil Using a Separate Drain Furnace Figure 33 Evaporator Coil Using A Separate Drain CAUTION A separate drain line must be run to the drain from the condensate trap. DO NOT connect the condensate trap drain into the drain line from the evaporator coil.
  • Page 27 Evaporator Coil using a Common Drain IMPORTANT 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. Condensate Trap with Optional Overflow Switch Figure 36 Figure 35 Evaporator Coil using a Common Drain...
  • Page 28 Trap / Drain Assembly using 1/2” PVC or 3/4” PVC Figure 38 Page 28 of 78 Issue 1213 506887-01...

  • Page 29: Gas Piping

    Gas Piping IMPORTANT CAUTION Compounds used on threaded joints of gas piping must be resistant to the actions of liquified petroleum gases. 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.
  • Page 30 NOTE: BLACK IRON PIPE ONLY TO BE ROUTED INSIDE OF CABINET Figure 36 Horizontal Applications Possible Gas Piping Configurations NOTE: BLACK IRON PIPE ONLY TO BE ROUTED INSIDE OF CABINET Figure 37 Page 30 of 78 Issue 1213 506887-01...
  • Page 31 GAS PIPE CAPACITY - FT³/HR (kL/HR) NOTE: Capacity given in cubic feet of gas per hour (kilo liters of gas per hour) and based on 0.60 specific gravity gas. Table 7 506887-01 Issue 1213 Page 31 of 78...

  • Page 32: Electrical

    NOTE: Unit nameplate states maximum current draw. See unpainted unit surface, such as the gas valve or blower table for maximum over-current protection. deck, before performing any service procedure. Maximum Over Current A97USMV Model Protection (Amps) INTERIOR MAKE-UP BOX INSTALLATION 070B12, 090C12, 090C16 090C20, 110C20, 135D20 Table 8 2.
  • Page 33 8. One line voltage “HUM” 1/4” spade terminal is provided Thermostat Selection on the furnace integrated control. Any humidifier or other A Confort Sync thermostat must be used in communicating 120V accessory rated up to one amp can be connected applications.
  • Page 34 Typical A97USMV Field Wiring Diagram for Standard Non-Communicating Thermostat Figure 44 Page 34 of 78 Issue 1213 506887-01...
  • Page 35 506887-01 Issue 1213 Page 35 of 78...
  • Page 36 Figure 46 Page 36 of 78 Issue 1213 506887-01...
  • Page 37 Field Wiring Connections for Non-Communicating Thermostat Applications D IP S w itch S ettin g s an d O n -B o ard L in ks (fig u re N O T AG ) D IP S w itch 1 W 915 W 914 W 951...
  • Page 38 Field Wiring for Non-Communicating Applications (continued) D IP S w itch S ettin g s an d O n -B o ard L in ks (fig u re N O T AG ) D IP S w itch 1 W 915 W 914 W 951 (Y 1 to Y 2)
  • Page 39 506887-01 Issue 1213 Page 39 of 78...
  • Page 40 Typical A97USMV Wiring Diagram Figure 47 Page 40 of 78 Issue 1213 506887-01...

  • Page 41: Integrated Control

    Integrated Control Figure 48 506887-01 Issue 1213 Page 41 of 78...
  • Page 42 Low Voltage Field Wiring Single Stage 2 Stage Table 14 Page 42 of 78 Issue 1213 506887-01...
  • Page 43 Thermostat Selection Switch Settings Table 15 NOTE - When this furnace is used with a Comfort Sync communicating thermostat, all indoor blower speed satisfied) can be adjusted by moving switches 4 and 5 on selections and DIP switch settings are made by the the integrated control.
  • Page 44 Switches 8 and 9 - Cooling Mode Blower Speed- Cooling Mode Blower Speed Ramping The unit is shipped from the factory with the DIP switches positioned for high speed (4) indoor blower motor operation during the cooling mode. The table below provides the cooling mode blower speeds that will result from different switch settings.
  • Page 45 Diagnostic LED Switches 14 through 19 - Heating Mode Blower Speed The seven segment diagnostic LED displays operating These switches are factory set at the OFF position which status, target airflow, error codes and other information. The provides 100% of normal speed during HIGH HEAT demand, table on page 58 lists diagnostic LED codes.

  • Page 46: Blower Motor Performance

    BLOWER DATA Page 46 of 78 Issue 1213 506887-01...
  • Page 47 BLOWER DATA 506887-01 Issue 1213 Page 47 of 78...
  • Page 48 BLOWER DATA Page 48 of 78 Issue 1213 506887-01...
  • Page 49 BLOWER DATA 506887-01 Issue 1213 Page 49 of 78...
  • Page 50 BLOWER DATA Page 50 of 78 Issue 1213 506887-01...
  • Page 51 BLOWER DATA 506887-01 Issue 1213 Page 51 of 78...
  • Page 52 BLOWER DATA Page 52 of 78 Issue 1213 506887-01...
  • Page 53 BLOWER DATA 506887-01 Issue 1213 Page 53 of 78...
  • Page 54 BLOWER DATA Page 54 of 78 Issue 1213 506887-01...
  • Page 55 TABLE 22 506887-01 Issue 1213 Page 55 of 78...
  • Page 56 TABLE 23 Page 56 of 78 Issue 1213 506887-01...

  • Page 57: Unit Start Up

    Unit Start Up BEFORE PLACING THE UNIT INTO OPERATION Smell all around the furnace area for gas. Be sure to smell FOR YOUR SAFETY READ BEFORE OPERATING next to the floor because some gas is heavier than air and will settle on the floor. WARNING The gas valve on these units are equipped with a gas control switch.

  • Page 58: Gas Pressure Measurement

    9. Replace the access panel. NOTE: To obtain accurate reading, shut off all other gas 10. Turn on all electrical power to the unit. appliances connected to meter. 11. Set the thermostat to desired setting. Supply Pressure Measurement NOTE: When unit is initially started, steps 1 through 11 A threaded plug on the inlet side of the gas valve provides may need to be repeated to purge air from gas line.

  • Page 59: High Altitude Information

    Table 25 NOTE - A natural to LP/propane gas changeover kit (table 24) is necessary to convert this unit. Refer to the changeover kit installation instructions for the conversion procedure. High Altitude Information Proper Combustion Furnace should operate a minimum of 15 minutes with NOTE: In Canada,certification for installationa at elevations correct manifold pressure and gas flow rate before checking over 4500 feet (1372 m) is the jurisidiction of local authorities.
  • Page 60 Figure 50 Page 60 of 78 Issue 1213 506887-01...

  • Page 61: Other Unit Adjustments

    Other Unit Adjustments Temperature Rise Primary Limit After the furnace has been started and supply and return air The primary limit is located on the heating compartment temperatures have been allowed to stabilize, check the vestibule panel. This limit is factory set and requires no temperature rise with the unit operating at 100 percent firing adjustment.

  • Page 62: Heating Sequence Of Operation

    Heating Sequence of Operation 6. At the end of the recognition delay and on all The integrated control initiates a pressure switch calibration subsequent calls for heat in the same heating cycle, at the initial unit start-up on a call for heat. The ignition the intergrated control energizes the combustion air control will also initiate a calibration any time main power is inducer at high speed.
  • Page 63 5. If second-stage heat is required, the thermostat second 2. Once the control receives a signal that the low fire stage heat contacts close and send a signal to the pressure switch has closed, the combustion air inducer integrated control. The integrated control either begins a 15 second prepurge at the ignition speed.

  • Page 64: Service

    Service 3. Check amp-draw on the blower motor with the blower access panel in place. Motor Nameplate_____________ Actual___________ WARNING Winterizing and Condensate Trap Care ELECTRICAL SHOCK, FIRE, 1. Turn off power to the unit. OR EXPLOSION HAZARD. 2. Have a shallow pan ready to empty condensate water. 3.
  • Page 65 18. Remove screws along vestibule sides and bottom which 39. Reconnect 2 pin plug to gas valve. secure vestibule panel and heat exchanger assembly 40. Replace the blower compartment access panel. to cabinet. Remove two screws from blower rail which 41.

  • Page 66: Planned Service

    Planned Service Return air duct - Must be properly attached and provide an air seal to the unit. A service technician should check the following items during an annual inspection. Power to the unit must be shut off for Operating performance - Unit must be observed during the service technician's safety.

  • Page 67: Integrated Control Diagnostic Codes

    Integrated Control Diagnostic Codes Press the diagnostic push button and hold it to cycle through a menu of options. Every five seconds a new menu item will be displayed. Release the button when the desired mode is displayed. When a solid "P" is displayed, the furnace capacity/ size can be programmed. When the solid "E"...
  • Page 68 Page 68 of 78 Issue 1213 506887-01...
  • Page 69 506887-01 Issue 1213 Page 69 of 78...

  • Page 70: Configuring Unit Size Codes

    Page 70 of 78 Issue 1213 506887-01...

  • Page 71: Troubleshooting

    Troubleshooting: Heating Sequence of Operation Ignition and Call for Low Fire With Two Stage Thermostat 506887-01 Issue 1213 Page 71 of 78...
  • Page 72 Troubleshooting : Heating Sequence of Operation (continued) Call for High Fire With Two Stage Thermostat Page 72 of 78 Issue 1213 506887-01...
  • Page 73 Troubleshooting : Heating Sequence of Operation (continued) Call for Heat Satisfied 506887-01 Issue 1213 Page 73 of 78...
  • Page 74 Troubleshooting : Heating Sequence of Operation (continued) Ignition and Call for Heat with Single Stage Thermostat Page 74 of 78 Issue 1213 506887-01...
  • Page 75 Troubleshooting : Cooling Sequence of Operation Call for Cooling 506887-01 Issue 1213 Page 75 of 78...
  • Page 76 Troubleshooting : Continuous Fan Sequence of Operation Continuous Low Speed Indoor Blower Sequence of Operation Page 76 of 78 Issue 1213 506887-01...

  • Page 77: Repair Parts List

    REPAIR PARTS LIST The following repair parts are available through Allied Air distributors. When ordering parts, include the complete furnace model number listed on the nameplate. All service must be performed by a licensed professional installer (or equivalent), service agency, or gas supplier. Cabinet Parts Heating Parts Heating Compartment Access Panel...
  • Page 78 REQUIREMENTS for COMMONWEALTH of MASSACHUSETTS Modifications to NFPA-54, Chapter 10 INSPECTION. The state or local gas inspector of the Revise NFPA-54 section 10.8.3 to add the following side wall, horizontally vented, gas-fueled equipment requirements: shall not approve the installation unless, upon inspection, the inspector observes carbon monoxide For all side wall, horizontally vented, gas-fueled equipment detectors and signage installed in accordance with the...

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