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Armstrong Air Conditioning A97DSMV Installation Instructions Manual

Warm air gas furnace downflow air discharge
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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
................................................................................ 4
Use of Furnace as a Construction Heater ............................................... 5
General .................................................................................................... 6
Setting Equipment ................................................................................... 6
Filters ......................................................................................................11
Duct System ............................................................................................ 9
Pipe and Fittings Specifications............................................................. 10
Joint Cementing Procedure ................................................................... 13
Venting Practices ................................................................................... 14
Vent Piping Guidelines .......................................................................... 16
Condensate Piping ............................................................................... 25
Gas Piping ............................................................................................. 28
*P507029-03*
(P) 507029-03
507029-03
INSTALLATION INSTRUCTIONS
A97DSMV
Warm Air Gas Furnace
Downflow Air Discharge
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™ thermostat must be used in
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

Integrated Control .................................................................................. 35
Blower Motor Performance .................................................................... 43
Unit Start Up .......................................................................................... 47
Gas Pressure Measurement.................................................................. 48
High Altitude Information ....................................................................... 49
Proper Combustion................................................................................ 49
Other Unit Adjustments.......................................................................... 51
Heating Sequence of Operation ............................................................ 52
Planned Service .................................................................................... 56
Integrated Control Diagnostic Codes..................................................... 57
Configuring Unit Size Codes ................................................................. 60
Troubleshooting ..................................................................................... 61
Repair Parts List .................................................................................... 67
Issue 1622
NOTICE
............................................................................................ 29
............................................................................................ 54
Manufactured By
Allied Air Enterprises LLC
A Lennox International, Inc. Company
215 Metropolitan Drive
West Columbia, SC 29170
Page 1 of 68

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Summary of Contents for Armstrong Air Conditioning A97DSMV

  • Page 1: Table Of Contents

    INSTALLATION INSTRUCTIONS A97DSMV Warm Air Gas Furnace Downflow 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.

  • 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 A97DSMV Exploded View Figure 1 507029-03 Issue 1622 Page 3 of 68...

  • Page 4: Gas Furnace

    A97DSMV Gas Furnace Safety Information The A97DSMV Category IV gas furnace is equipped with a variable capacity, varable speed integrated control. Each DANGER A97DSMV is shipped ready for installation in the downflow air discharge position. DANGER OF EXPLOSION! The furnace is equipped for installation in natural gas There are circumstances in which odorant used with applications only.

  • Page 5: Use Of Furnace As A Construction Heater

    Do Not set thermostat below 60° F (16° C) in heating mode. Setting thermostat below 60° F (16° C) reduces This A97DSMV furnace must be installed so that its electrical the number of heating cycles. Damage to the unit may components are protected from water.

  • Page 6: General

    • Air filters must be replaced upon construction completion. In addition to the requirements outlined previously, the • The input rate and temperature rise must be set per the following general recommendations should be considered furnace rating plate. when installing one of these furnaces: •...
  • Page 7 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 507029-03 Issue 1622...
  • Page 8 See Figure 7. Removing the Bottom Panel Figure 6 A97DSMV 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 feet) require either a...
  • 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 Horizontal Applications Cooling coils and supply and return air plenums must The A97DSMV furnace can be installed in horizontal be supported 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 IMPORTANT with American National Standard Institute and the American Society for Testing and Materials (ANSI/ASTM) standards. The exhaust and intake connections are made of PVC. The solvent shall be free flowing and contain no lumps, Use PVC primer and solvent cement when using PVC undissolved particles or any foreign matter that adversely vent pipe.
  • Page 13 OUTDOOR TERMINATION KITS USAGE Table 3 507029-03 Issue 1622 Page 13 of 68...

  • Page 14: Joint Cementing Procedure

    Joint Cementing Procedure Venting Practices All cementing of joints should be done according to the specifications outlined in ASTM D2855. Piping Suspension Guidelines DANGER DANGER OF EXPLOSION! Fumes from PVC glue may ignite during system check. Allow fumes to dissipate for at least 5 minutes before placing unit into operation.

  • Page 15: Vent Piping Guidelines

    Vent Piping Guidelines 1. In areas where piping penetrates joist or interior walls, hole must be large enough to allow clearance on all This unit is installed only as a Direct Vent gas central sides of pipe through center of hole using a hanger. furnace.
  • Page 16 Use the following steps to correctly size vent pipe diameter. EXHAUST PIPE Horizontal Application NOTE: All horizontal runs of exhaust pipe must slope back toward unit. A minimum of 1/4” (6 mm) drop for each 12” (305 mm) of horizontal run is mandatory for drainage.
  • Page 17 Maximum Allowable Intake or Exhaust Vent Length (feet) Table 5 507029-03 Issue 1622 Page 17 of 68...
  • Page 18 TYPICAL EXHAUST PIPE CONNECTIONS AND CONDENSATE TRAP INSTALLATION IN UPFLOW APPLICATIONS Figure 18 TYPICAL EXHAUST PIPE CONNECTIONS AND CONDENSATE TRAP INSTALLATION IN HORIZONTAL AIR APPLICATIONS (RIGHT HAND DISCHARGE SHOWN) Figure 19 Page 18 of 68 Issue 1622 507029-03...
  • Page 19 VENT TERMINATION CLEARANCES FOR DIRECT VENT INSTALLATiONS IN THE USA AND CANADA Figure 20 507029-03 Issue 1622 Page 19 of 68...
  • Page 20 winter design temperatures below 32°F (O°C). If equired General Guidelines for Vent Terminations 1/2” exhaust pipe should be insulated with (13mm) In Direct Vent applications, combustion air is taken from Armaflex or equivalent. In extreme cold climate areas, outdoors and the flue gases are discharged to the outdoors. 3/4”...
  • Page 21 Details of Intake and Exhaust Piping Terminations for Exiting Exhaust and Intake Vent 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.
  • Page 22 Field Supplied Wall Termination Field Supplied Wall Termination or with Intake Elbow (15F74) Wall Ring Termination Kit See venting Table 5 for maximum venting lengths with this See venting Table 5 for maximum venting lengths with this arrangement. arrangement. * Use wall support every 24” (610 mm). Use two wall supports if * Use wall support every 24”...
  • Page 23 Exhaust Pipe Termination Size Reduction Direct Vent Concentric Wall Termination 71M80, 69M29 OR 60L46 (US) 44W92 or 44W93 (Canada) * 070 and 090 units installed with flush mount termination must use the 1-1/2” accelerator supplied with the kit. Table 7 5.
  • Page 24 Figure 29 Page 24 of 68 Issue 1622 507029-03...

  • Page 25: Condensate Piping

    Direct Vent Application Using Existing Chimney Condensate Trap and Plug Locations NOTE: Do not discharge exhaust gases directly into any chimney or vent stack. If vertical discharge through an existing unused chimney or stack is required, insert piping inside chimney until the pipe open end is above top of chimney and terminates as illustrated.
  • Page 26 Condensate line must slope downward away from the trap to drain. If drain level is above condensate trap, condensate IMPORTANT pump must be used. Condensate drain line should be routed within the conditioned space to avoid freezing of condensate When combining the furnace and evaporator coil and blockage of drain line.
  • Page 27 Trap / Drain Assembly Using 1/2” PVC or 3/4” PVC Figure 36 507029-03 Issue 1622 Page 27 of 68...

  • Page 28: 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 of the furnace cabinet.
  • Page 29 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 507029-03 Issue 1622 Page 29 of 68...

  • Page 30: Electrical

    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 9 Electrical INTERIOR MAKE-UP BOX INSTALLATION ELECTROSTATIC DISCHARGE (ESD) Precautions and Procedures CAUTION Electrostatic discharge can affect electronic components.
  • Page 31 1. The power supply wiring must meet Class I restrictions. Install the room thermostat according to the instructions Protected by either a fuse or circuit breaker, select circuit provided with the thermostat. See Table 11 for protection and wire size according to unit nameplate. thermostat connections.
  • Page 32 Generator Use - Voltage Requirements Run Length – Non Communicating The following requirements must be kept in mind when specifying a generator for use with this equipment: • The furnace requires 120 volts ± 10% (Range: 108 volts to 132 volts). •...
  • Page 33 Typical A97DSMV Wiring Diagram Figure 43 507029-03 Issue 1622 Page 33 of 68...
  • Page 34 Figure 45 Page 34 of 68 Issue 1622 507029-03...
  • Page 35 Figure 46 507029-03 Issue 1622 Page 35 of 68...

  • Page 36: Integrated Control

    Integrated Control Figure 47 Page 36 of 68 Issue 1622 507029-03...
  • Page 37 Field Wiring Connections for Non-Communicating Thermostat Applications *”R” required on some units. Table 13A 507029-03 Issue 1622 Page 37 of 68...
  • Page 38 Field Wiring for Non-Communicating Applications (continued) * “R” required on some units. Table 13B Page 38 of 68 Issue 1622 507029-03...
  • Page 39 Field Wiring for Non-Communicating Applications (continued) * Connect W1 to W1 ONLY if using defrost tempering kit 67M41. NOTE: Do NOT make a wire connection between the room thermolstat L terminal and the L terminal of the A97USMV integrated control. Table 13C 507029-03 Issue 1622...
  • Page 40 Low Voltage Field Wiring 2 Stage Single Stage Table 14 Page 40 of 68 Issue 1622 507029-03...
  • Page 41 Thermostat Selection Switch Settings Table 15 These units are equipped with an integrated control. This satisfied) can be adjusted by moving switches 4 and 5 on control manages ignition timing, combustion air inducer the integrated control. The unit is shipped from the factory speed, heating mode fan OFF delays and indoor blower with a blower Off delay of 90 seconds.
  • Page 42 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 43 Diagnostic LED (Figure ??) 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. provides 100% of normal speed during HIGH HEAT demand, The table on page 58 lists diagnostic LED codes.

  • Page 44: Blower Data

    BLOWER DATA Page 44 of 68 Issue 1622 507029-03...
  • Page 45 BLOWER DATA BLOWER DATA A97DSMV110C20S BLOWER PERFORMANCE (less filter) HEATING BLOWER PERFORMANCE Heating Input Range and Blower Volume - CFM Heating Adjust CFM Selections 100% Increase (+15%) Heat CFM 1085 1275 1465 1660 1850 2040 Increase (+7.5%) Heat CFM 1010 1190 1370 1550...
  • Page 46 COOLING OPERATING SEQUENCE A97DSMV and Single Stage Outdoor Unit Table 22 Page 46 of 68 Issue 1622 507029-03...
  • Page 47 COOLING OPERATING SEQUENCE A97DSMV and Two Stage Outdoor Unit Table 23 507029-03 Issue 1622 Page 47 of 68...

  • Page 48: 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 49: Gas Pressure Measurement

    NOTE: To obtain accurate reading, shut off all other gas 9. Replace the access panel. 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 50: High Altitude Information

    Proper Combustion High Altitude Information Furnace should operate a minimum of 15 minutes with cor- rect manifold pressure and gas flow rate begore checking NOTE: In Canada, certification for installation at elevations combustion. Take combustion sample beyond the flue outlet over 4500 feet (1372 m) is the jurisidiction of local authorities.
  • Page 51 Manifold Pressure Measurement Operation Signal (Delta P) Measurement Figure 50 507029-03 Issue 1622 Page 51 of 68...

  • Page 52: Other Unit Adjustments

    Other Unit Adjustments Temperature Rise After the furnace has been started and supply and return Primary Limit air temperatures have been allowed to stabilize, check the The primary limit is located on the heating compartment temperature rise with the unit operating at 100 percent firing vestibule panel.

  • Page 53: Heating Sequence Of Operation

    Heating Sequence of Operation At the end of the recognition delay and on all subsequent The integrated control initiates a pressure switch calibration calls heat in the same heating cycle, the intergrated at the initial unit start-up on a call for heat.
  • Page 54 If second-stage heat is required, the thermostat Once the control receives a signal that the low fire second stage heat contacts close and send a signal pressure switch has closed, the combustion air inducer to the integrated control. The integrated control either begins a 15 second prepurge at the ignition speed.

  • Page 55: Service

    Service Check amp-draw on the blower motor with the blower access panel in place. Motor Nameplate _____________ Actual ________ WARNING Winterizing and Condensate Trap Care 1. Turn off power to the unit. ELECTRICAL SHOCK, FIRE, 2. Have a shallow pan ready to empty condensate water.

  • Page 56: Planned Service

    Planned Service Return air duct Must be properly attached and provide A service technician should check the following items during an air seal to the unit. 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 57 507029-03 Issue 1622 Page 57 of 68...
  • Page 58 Page 58 of 68 Issue 1622 507029-03...
  • Page 59 507029-03 Issue 1622 Page 59 of 68...

  • Page 60: Configuring Unit Size Codes

    Configuring Unit Size Codes Page 60 of 68 Issue 1622 507029-03...

  • Page 61: Troubleshooting

    Troubleshooting: Heating Sequence of Operation 507029-03 Issue 1622 Page 61 of 68...
  • Page 62 Troubleshooting: Heating Sequence of Operation (continued) Page 62 of 68 Issue 1622 507029-03...
  • Page 63 Troubleshooting: Heating Sequence of Operation (continued) 507029-03 Issue 1622 Page 63 of 68...
  • Page 64 Troubleshooting: Heating Sequence of Operation (continued) Page 64 of 68 Issue 1622 507029-03...
  • Page 65 Troubleshooting: Cooling Sequence of Operation 507029-03 Issue 1622 Page 65 of 68...
  • Page 66 Troubleshooting: Continuous Fan Sequence of Operation Page 66 of 68 Issue 1622 507029-03...

  • Page 67: 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 68 REQUIREMENTS for COMMONWEALTH of MASSACHUSETTS Modifications to NFPA-54, Chapter 10 4. 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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