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Armstrong Air G2D93CT Installation Instructions Manual

High efficiency multiposition gas furnace with system sentry control system
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INSTALLATION INSTRUCTIONS
G2D93CT, G2D93CU, G2D95CT, & G2D95CU
High Efficiency Multiposition Gas Furnace
with System Sentry™ Control System
Improper installation, adjustment, alteration, service, or maintenance can cause injury or
property damage. Refer to this manual. For assistance or additional information, consult
a qualified installer, service agency, or the gas supplier.
WARNING
Do not store combustible materials, including
gasoline and other flammable vapors and
liquids, near the furnace, vent pipe, or warm air
ducts. The homeowner should be cautioned that
the furnace area must not be used as a broom
closet or for any other storage purposes. Such
uses may result in actions that could cause
property damage, personal injury, or death.
WARNING
This furnace is not approved for installation in
a mobile home. Do not install this furnace in a
mobile home. Installation in a mobile home
could result in actions that could cause prop-
erty damage, personal injury, or death.
The installation of the furnace, wiring, warm air ducts, venting, etc. must conform to the requirements of the
National Fire Protection Association; the National Fuel Gas Code, ANSI Z223.1/NFPA No. 54 (latest edition) and
the National Electrical Code, ANSI/NFPA No. 70 (latest edition) in the United States; CSA B149.1 (latest edition)
Natural Gas and Propane Installation Codes and the Canadian Electrical Code Part 1, CSA 22.1 (latest edition)
in Canada; and any state or provincial laws, local ordinances (including plumbing or wastewater codes), or local
gas utility requirements. Local authorities having jurisdiction should be consulted before installation is made.
Such applicable regulations or requirements take precedence over the general instructions in this manual.
# 47904K005
WARNING
IMPORTANT
Save these instructions for future reference

TABLE OF CONTENTS

SAFETY ................................................. 2
INSTALLATION ...................................... 3
START-UP ............................................ 26
OPERATION ........................................ 27
MAINTENANCE ................................... 33
CONTROL DIAGNOSTICS .................. 34
REPAIR PARTS ................................... 35
WIRING DIAGRAMS............................ 36
Manufactured By
A.A.C.
A Lennox International Inc. Company
421 Monroe Street
Bellevue, OH 44811
*47904K005*
Page 1

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Summary of Contents for Armstrong Air G2D93CT

  • Page 1: Table Of Contents

    INSTALLATION INSTRUCTIONS G2D93CT, G2D93CU, G2D95CT, & G2D95CU High Efficiency Multiposition Gas Furnace with System Sentry™ Control System WARNING Improper installation, adjustment, alteration, service, or maintenance can cause injury or property damage. Refer to this manual. For assistance or additional information, consult a qualified installer, service agency, or the gas supplier.

  • Page 2: Safety

    SAFETY WARNING The following is a list of safety rules and precautions that In the State of Massachusetts: must be followed when installing this furnace. This product must be installed by a licensed 1. Use only with the type of gas approved for this Plumber or Gas Fitter.

  • Page 3: Installation

    155°F. G2D93CT and G2D95CT furnaces may be installed as upflow or horizontal furnaces. When installed horizontally, the installer must install a sheet metal screw to retain the upper door as shown in Figure 1.
  • Page 4 An unconfined space is defined as “a space whose G2D93CT and G2D95CT models may be installed on wood volume is more than 50 cubic feet per 1000 BTU per hour flooring but shall not be installed directly on carpeting, tile, or of the combined input rating of all appliances installed in any other combustible material.
  • Page 5 The recommended source of combustion air is outdoor air. G2D93CT, G2D93CU, G2D95CT, and G2D95CU models However, the use of indoor air in most applications is can be installed as either direct vent or non-direct vent acceptable if the following guidelines are followed: units.
  • Page 6 All vents passing through floors, ceilings, and walls must be installed in accordance with National Fuel Gas Code, Inlet Air Restrictor Plate ANSI Z223.1/NFPA 54 (latest edition). The inlet air restrictor plate must be In all applications where the flue pipe is run through installed in all installations using inside an unconditioned space, 1/2"...
  • Page 7 The primers and solvents used must also meet ASTM specifications. PVC primer is specified in ASTM F656. Use Vent Tables PVC solvent as specified in ASTM D2564 and ABS solvent (numbers in inches unless specified otherwise) cement as specified ASTM D2235. Low temperature solvent Minimum Pipe Diameter cement is recommended.
  • Page 8 and air intake. If the results indicate different diameters, use the larger of the two for both the vent and air intake. Under no circumstances should the vent and air intake pipe size be different in diameter. For installation details, refer to the appropriate section in pages 11 – 15 for the unit model and type of installation.
  • Page 9 Sidewall Vent Terminal Clearances (Direct Vented Furnaces) Vent Terminal Air Supply Inlet Area Where Terminal Is Not Permitted a i l < a i l < a i l > a i l > < < a i l > a i l >...
  • Page 10 Sidewall Vent Terminal Clearances (Non-Direct Vented Furnaces) Vent Terminal Air Supply Inlet Area Where Terminal Is Not Permitted a i l < a i l > < a i l > y l t i t r a l i t i f f h t i l a t...
  • Page 11 Upflow Direct Vent Installation upward, away from the furnace, at a minimum pitch of 1/4" per foot of run, to prevent accumulation of condensate. An inlet air restrictor plate (see Figure 2 on page 6) is supplied with this furnace and can be found in the plastic bag containing Do not cement air intake into the connector on burner these Installation Instructions and the User’s Information box.

  • Page 12: Horizontal Venting

    Upflow Non-Direct Vent Installation Upflow Non-Direct Vent An inlet air restrictor plate (see Figure 2 on page 6) is Vertical Venting supplied with this furnace and can be found in the plastic bag containing these Installation Instructions and the User’s Information Manual. This restrictor plate is to be used only in non-direct vent applications.

  • Page 13: Vertical Venting

    these areas, moisture in the flue gases may condense and Do not cement air intake into the connector on burner freeze on the air intake if this height is reduced. In milder box. Use high temperature RTV silicone sealant so climates, this may be reduced to a minimum of 6".
  • Page 14 Prime the trap system by slowly pouring 1 cup of water For horizontal venting, refer to Figure 13. For vertical venting, down the vent pipe. On initial start-up of the unit, some of refer to Figure 14. The vent pipe on horizontal runs must the water used to prime the trap system may run down slope upward, away from the furnace, at a minimum pitch of into the combustion blower and cause noise.
  • Page 15 Horizontal Venting – Low Clearance Installations system can result in spillage of flue products into the living space, the formation of condensate, leakage, etc. See the Vent pipe on horizontal runs must slope upward, away from WARNING box below for proper test procedure. the furnace, at a minimum pitch of 1/4"...
  • Page 16 Condensate Disposal Installation Tilt Unit Forward The condensate drain should be routed directly to a locally acceptable disposal area. The condensate drain line 1/4" Max should not be run directly to the outdoors especially in colder climates where temperatures may cause the condensate to freeze in the drain line.
  • Page 17 4. Connect a length of 3/4" PVC pipe (3' minimum) to the trap assembly (see Figure 21). Tilt Unit Forward 5. Install 3/4" tee (supplied) as shown in Figure 21. " 1/4 Max. Completing Condensate Drain Installation Figure 22 Insert Plugs 3/4"...
  • Page 18 Horizontal Installation – Tight Clearance Below Unit Completing Condensate In certain horizontal installations, clearance between unit Drain Installation and drain pan beneath unit may be limited. In these applica- tions, an alternate method may be used to install the condensate drain trap assembly. Using two 90° elbows (field supplied), bring condensate trap out to side of unit beyond drain pan (see Figure 26).
  • Page 19 W.C. pressure switch hose to the tee. Be sure that the pressure switch hose does not form a trap to hold Pressure Switch Connection condensation that could form from the flue gas. Hose Horizontal Installation – R to L Airflow may be cut shorter to avoid forming a trap, if required.
  • Page 20 Outlet Duct Filter Rack Installation For installations not equipped with a cooling coil, a remov- able access panel must be provided in the outlet duct. The Filter Rack Mounting Hole opening should be accessible when the furnace is placed Screw in service.
  • Page 21 WARNING Gas Piping Connection Any conversion of a natural gas unit to pro- Manual pane gas must be done by qualified personnel Gas Valve 1/8" NPT using a conversion kit available from the Plugged manufacturer, following the instructions in the Union Tapping conversion kit.
  • Page 22 The automatic heat staging option allows a single stage the warranty. thermostat to be used with a two stage G2D93CT/U or G2D95CT/U furnace. To activate this option, move the jumper pin (see Figure 33) to desired setting (5 minutes or 10 minutes).
  • Page 23 This minimizes noise and increases comfort by eliminating the initial blasts of air encountered To twin two G2D93CT/U furnaces, connect wires as with standard motors. shown in either Figure 34 below or Figure 35 on page 24.
  • Page 24 Wiring Connections for Twinning Two G2D93CT/U Furnaces Two Stage Heating/Single Stage Cooling Figure 35 Soft Stop at a 18% reduction in the normal cooling airflow rate when there is a call for dehumidification. At the end of a cooling or heating cycle, the variable...
  • Page 25 Adjusting Airflow – G2D95CT/U Models Only ADJUST, HEAT, and COOL Taps on Integrated Ignition/Blower Control Board Figure 36 The TEST position on the ADJUST tap is not used. The jumper plug on the HEAT tap should remain in the position (A, B, C, or D) listed in the HEAT Setting column in the table found in Figure 36.

  • Page 26: Start-Up

    3. Move the gas control knob to the “ON” position. Use START-UP only your hand to turn the gas control knob; never use tools. If the knob will not turn by hand, don’t try to Lighting Instructions repair it; call a qualified service technician. Force or For Your Safety, Read Before Operating attempted repair may result in a fire or explosion.

  • Page 27: Operation

    OPERATION Fan On A call for fan from the thermostat closes R to G on the Sequence of Operation (G2D93CT/U Models) control board. The control waits for a 1-second thermostat Heating debounce delay before responding by energizing the low heat speed blower. When the call for fan is turned off, the When the control is in standby mode, it continually monitors control de-energizes the blower.
  • Page 28 Stage – 2 Stage (W1/W2) Heat Call (G2D95CT/U Models) W1/W2 w1 w2 2 min 100%** W1 - Heat Demand Present 82%** 2 min - Heat Demand Satisfied 100%* 82%* W2 - High Heat Demand Present - High Heat Demand Satisfied 75%* 50%* CALL...
  • Page 29 If the active dehumidification feature is enabled, the Two Stage Cooling circulating blower runs at 82% of the selected cooling speed as long as there is a call for dehumidification. (G2D95CT/U Models) Y1 y2 IMPORTANT 100% The system must not be in either the passive minutes or active dehumidification mode when charg- ing a cooling system.
  • Page 30 Under Vent Cap ries connected to it. G2D93CT/U models feature user-selectable blower “off” delay times (60, 90, 120, and 180 seconds) that are factory set to provide a 120-second blower “off” delay on heating (see wiring diagram on page 36).
  • Page 31 High Altitude CAUTION In both the United States and Canada, this furnace is The furnace rate must be within +/- 2% of the approved for operation at altitudes from 0 to 4500' above appliance rating input. sea level without any required modifications. From 4500' to 7500', the gas manifold pressure needs to be adjusted according to the information shown in Table 4.
  • Page 32 Verify that the unit is operating at the desired speed and within the rise range as shown on the unit rating plate. The correct replacement motor must be installed as soon as possible to ensure continued satisfactory operation of the furnace. Page 32 # 47904K005...

  • Page 33: Maintenance

    MAINTENANCE Burners Light the burners and allow to operate for a few minutes to establish normal burning conditions. Observe the burner WARNING flames. Compare this observation to Figure 43 to determine ELECTRICAL SHOCK, FIRE, if proper flame adjustment is present. Flame should be predominantly blue in color and strong in appearance.

  • Page 34: Control Diagnostics

    System Sentry™ CONTROL DIAGNOSTICS Failure Codes – Red LED Troubleshooting Make the following visual checks before troubleshooting: 1. Check to see that the power to the furnace and the integrated ignition/blower control board is ON. 2. The manual shutoff valves in the gas line to the furnace must be open.

  • Page 35: Repair Parts

    REPAIR PARTS The following repair parts are available from the local distributor. When ordering parts, include the complete furnace model number and serial number which are printed on the rating plate located on the furnace. Control Group Transformer High limit control Auxiliary limit Gas valve Integrated ignition/blower control board...

  • Page 36: Wiring Diagrams

    BY THE INDOOR THERMOSTAT. REFER TO THE THERMOSTAT 80D20 * INSTALLATION INSTRUCTIONS. 100D20 * 5. CHECK CODES FOR PROPER WIRING AND CIRCUIT 125D20 * PROTECTION BEFORE INSTALLATION. * 5 SPEED MOTOR USED ON THESE MODELS G2D93CT Connection Diagram P/N 45604-005 Figure 44 Page 36 # 47904K005...
  • Page 37 G2D93CT Wiring Schematic P/N 45604-005 Figure 45 # 47904K005 Page 37...
  • Page 38 HOT SURFACE IGNITER INDUCED FLAME PRESSURE DRAFT PRESSURE PRESSURE SWITCH - ROLLOUT SENSOR BLOWER SWITCH SWITCH DRAIN SWITCH ROLLOUT GAS VALVE (HIGH) (LOW) (IF USED) (IF USED) SWITCH C HI WHT/BLK 2-PIN MAIN CONNECTOR LIMIT RED/BLK 120/1/60 NEUTRAL GROUND INTERLOCK SWITCH BLK/WHT TRANSFORMER...
  • Page 39 G2D95CT Wiring Schematic P/N 46131-004 Figure 47 # 47904K005 Page 39...

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G2d93cuG2d95ctG2d95cu

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