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INSTALLATION INSTRUCTIONS
G1D80BT, G1D80BR, G2D80CT, & G2D80CR
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.
# 45465K005
80% Gas Furnace
WARNING
IMPORTANT
Save these instructions for future reference
TABLE OF CONTENTS
SAFETY ................................................. 2
INSTALLATION....................................... 3
START-UP ............................................ 19
OPERATION ........................................ 20
MAINTENANCE ................................... 25
CONTROL DIAGNOSTICS .................. 26
REPAIR PARTS .................................... 27
WIRING DIAGRAMS ............................ 28
Manufactured By
A.A.C.
A Lennox International Inc. Company
421 Monroe Street
Bellevue, OH 44811
*45465K005*
Page 1
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Summary of Contents for Armstrong G1D80BT
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Page 1: Table Of Contents
INSTALLATION INSTRUCTIONS G1D80BT, G1D80BR, G2D80CT, & G2D80CR 80% 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
IMPORTANT SAFETY INFORMATION The following is a list of safety rules and precautions which has an external static pressure within the allowable range, as specified in Temperature Rise on that must be followed when installing this furnace. page 23 of these instructions. See furnace rating plate. 1. -
Page 3: Installation
If installed in a closet or utility room, provide 18" clearance in front for service if the door to the room is G1D80BT and G2D80CT models may be installed as not in line with the front of the furnace. - Page 4 The input rate and temperature rise must be set per to combustibles, servicing clearances take precedence. the furnace rating plate. G1D80BT, G2D80CT, and horizontally installed G1D80BR • One hundred percent (100%) outdoor air must be and G2D80CR models may be installed on wood flooring,...
- Page 5 Unconfined Space opening shall be within 12" of the ceiling and one opening within 12" of the floor. Several methods can be used to An unconfined space is defined as “a space whose bring the outside air in through these openings. The open- volume is more than 50 cubic feet per 1000 BTU per hour ings shall open directly or by ducts with the outdoors, of the combined input rating of all appliances installed in...
- Page 6 5. Exposure to the following substances in the combustion air supply may also require outdoor air for combustion: Equipment in Confined Space All Air from Outside • Permanent wave solutions (All Air Through Horizontal Ducts) • Chlorinated waxes and cleaners •...
- Page 7 Sidewall Venting WARNING This furnace can be sidewall (horizontally) vented with a If at any time in the future the installation of listed sidewall venter, such as Field Controls Model SWG- this furnace is changed to require outside 4HD with CK-43 Control Kit, or Tjernlund Model GPAK-JT. fresh air for combustion, the inlet air restrictor Category I venting classification is maintained when vented plate must be removed.
- Page 8 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 9 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 10 3. It is recommended a minimum of 26 gauge galvanized 6. The furnace shall be connected to a factory-built flue pipe be used. Use of single-wall vent pipe for the vent chimney or vent complying with a recognized stan- connector is permissible only in conditioned space. Use dard, or a masonry or concrete chimney lined with a Doublewall Type B vent pipe through unconditioned lining material acceptable to the authority with jurisdic-...
- Page 11 Masonry Chimney Venting Factory-Built Chimney Venting Liner Factory-Built Chimney Cleanout Masonry Chimney Cleanout Figure 12 Figure 13 and for more information on the provisions for fresh air to PVC, ABS, single wall galvanized, or single wall furnaces, refer to the latest edition of the National Fuel stainless steel pipe (see Table 1).
- Page 12 Optional Attic Inlet Air Optional Outside Air Gable Vent Gable Vent ” 16 Min. 12” Min. Joist and Insulation Note: Attic Must Be Well Ventilated Joist and Insulation Soffit Soffit Vents Vents Water Water Heater Heater Furnace Furnace Figure 15 Figure 16 important that the inlet terminate in the attic 12"...
- Page 13 Upflow Installations appliance(s) connected to the venting system are located and other spaces in the building. G1D80BT and G2D80CT series furnaces can be installed as upflow units with either a side or bottom air return. For 4. Close fireplace dampers.
- Page 14 Side Return Filter Rack Mounting Hole A filter rack and cleanable 16" x 25" x 1/2" filter are supplied with each G1D80BT and G2D80CT furnace. Screw (Models designed for more than 1600 CFM nominal air delivery include two of each.) The filter rack is to be installed between the return air duct and the side of the furnace.
- Page 15 Bottom Return Gas Supply and Piping G2D80CT series furnaces are designed with a special Refer to the furnace rating plate to make sure the furnace knockout base pan for bottom return applications. The is equipped to burn the gas supplied (natural or propane). removable pan is perforated and held in place by small metal tabs that must be detached before removing the WARNING...
- Page 16 Gas supply piping should be installed in accordance with The furnace must be isolated from the gas supply piping local codes and the regulations of the utility. Piping must be system by closing the individual manual shutoff valve of adequate size to prevent undue pressure drop. Consult during any pressure testing of the gas supply piping the local utility or gas supplier for complete details on special system at test pressure equal to or less than 1/2 psig...
- Page 17 W1 on the control board must be connected to W1 on the thermostat. G1D80BR and G1D80BT Models – To twin two G1D80BR or G1D80BT model furnaces, an accessory kit must be Humidifier ordered from the manufacturer (see Accessories on page 27).
- Page 18 G2D80CR and G2D80CT Models – To twin two G2D80CR Figure 24 or Figure 25 except in this single stage stat configuration, the W2 must remain open (only W1 or G2D80CT furnaces, connect wires as shown in either should be connected). Figure 24 or Figure 25.
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Page 19: Start-Up
START-UP To Start Furnace: Lighting Instructions CAUTION For Your Safety, Read Before Operating Be sure the manual gas control has been in the “OFF” position for at least 5 minutes before starting the unit. Do not attempt to WARNING manually light the burners. If you do not follow these instructions exactly, a fire or explosion may result causing prop- erty damage, personal injury, or loss of life. -
Page 20: Operation
OPERATION Cooling Sequence of Operation (G1D80BR and G1D80BT During a call for cooling, the thermostat energizes the R-Y Models) circuit of the control board. After a 1-second cooling “on” delay, the control energizes the cooling fan speed. If the fan... - Page 21 Rollout Switch When the 2 stage heat is satisfied, the control shuts off the gas valve and runs the combustion blower for a post- purge period of 15 seconds. The circulating air blower The rollout switch is a normally closed switch that opens continues to run according until the selected blower “off”...
- Page 22 4. The remaining speed taps must be connected to To continue the checking and adjusting gas input procedure on G1D80BR and G1D80BT models, see For Natural Gas: dummy terminals marked “PARK” on the control board. on next page. Checking and Adjusting Gas Input...
- Page 23 Manifold Pressure vs. Altitude for the gas being used. G1D80BR and G1D80BT Models Be sure to replace the inlet and outlet pressure tap plugs after testing and/or adjusting gas input. i t l ) .
- Page 24 Manifold Pressure vs. Altitude G2D80CR and G2D80CT Models i t l ) t f * Consult local utility for actual heating value. Furnace Input = Input Factor x Nameplate Input Above 7500 feet, call Technical Services at 1-800-448-5872 ext. 2610. Table 4 Page 24 # 45465K005...
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Page 25: Maintenance
MAINTENANCE lint accumulation or dirt inside the burner or burner ports, at the air inlet between the burner and manifold pipe, or obstructions over the burner orifice. WARNING Use a soft brush or vacuum to clean the affected areas. ELECTRICAL SHOCK, FIRE, OR EXPLOSION HAZARD Typical Flame Appearance Failure to follow the safety warnings exactly... -
Page 26: Control Diagnostics
System Sentry™ CONTROL DIAGNOSTICS Failure Codes – Red LED Troubleshooting G1D80BR and G1D80BT Models 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 27: Repair Parts
Side Return Filter Kit (upflow models) AFILT525 Return Filter Kit (counterflow models) AFILT529 Bottom Return Filter Kit ATWIN579 Twinning Kit (G1D80BR and G1D80BT models only) AFOSL443 Fossil Fuel Kit ABASE512 Combustible Floor Base (17.5" cabinets) ABASE568 Combustible Floor Base (21.0" cabinets) ABASE569 Combustible Floor Base (24.5"... -
Page 28: Wiring Diagrams
4. CHECK CODES FOR PROPER WIRING AND BE REPLACED, IT MUST BE REPLACED CIRCUIT PROTECTION BEFORE INSTALLATION. WITH WIRING MATERIAL HAVING A TEMP. RATING OF AT LEAST 90°C. G1D80BT, G1D80BR Connection Diagram P/N 45198-006 Figure 29 Page 28 # 45465K005... - Page 29 G1D80BT, G1D80BR Schematic Diagram P/N 45198-006 Figure 30 # 45465K005 Page 29...
- Page 30 INDUCED FLAME HOT SURFACE PRESSURE DRAFT ROLLOUT PRESSURE PRESSURE SWITCH SENSOR IGNITER SWITCH BLOWER SWITCH SWITCH (DRAIN) (IF USED) ROLLOUT (HIGH) GAS VALVE (LOW) (IF USED) SWITCH C HI WHT/BLK 2-PIN CONNECTOR MAIN LIMIT RED/BLK 120/1/60 NEUTRAL GROUND NOTE 3 INTERLOCK SWITCH BLK/WHT...
- Page 31 G2D80CT, G2D80CR Wiring Schematic P/N 45604-005 Figure 32 # 45465K005 Page 31...
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