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INSTALLATION INSTRUCTIONS
G1N80BU, GIN80BR, GIN80BT, CG80UB, CG80RB, & CG80TB
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 cau-
tioned 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 con-
sulted before installation is made. Such applicable regulations or requirements take precedence over the
general instructions in this manual.
# 45464K003
80% Gas-Fired Furnace
WARNING
®
IMPORTANT
TABLE OF CONTENTS
SAFETY ................................................. 2
INSTALLATION ...................................... 2
START-UP ............................................ 14
OPERATION ........................................ 15
MAINTENANCE................................... 16
REPAIR PARTS ................................... 18
WIRING DIAGRAMS ............................ 19
Manufactured By
A.A.C.
A Lennox International Company
421 Monroe Street
Bellevue, OH 44811
Page 1
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Summary of Contents for Lennox G1N80BU
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Page 1: Table Of Contents
INSTALLATION INSTRUCTIONS G1N80BU, GIN80BR, GIN80BT, CG80UB, CG80RB, & CG80TB 80% Gas-Fired Furnace 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
When installed horizontally, the installer must install a sheet metal screw to retain the upper door as shown in Figure 1. G1N80BU and CG80UB models must be installed only as upflow furnaces. Never install any furnace on its back. - Page 3 Figure 2. Where servicing clearances are greater than clearances to combustibles, servicing clearances take precedence. G1N80BU, G1N80BT, CG80UB, and CG80TB models, and horizontally installed G1N80BR and CG80RB models may Horizontal Installations...
- Page 4 G1N80BR, G1N80BT, CG80RB, and CG80TB models may However, in a building of unusually tight construction, be installed as suspended units in the horizontal position. additional outdoor air should be provided. These furnaces are not designed for direct attachment of suspension rods to the furnace casing. Confined Space The suspending means must be field fabricated, and A confined space is defined as “a space whose volume is...
- Page 5 Equipment in Confined Space Equipment in Confined Space All Air from Outside All Air from Outside (Inlet Air from Crawl Space and (All Air Through Horizontal Ducts) Outlet Air to Ventilated Attic) Chimney or Chimney or Gas Vent Gas Vent Water Heater Ventilation Louvers (Each end of attic)
- Page 6 Printing inks, paint removers, varnishes, etc. vent connector is permissible only in conditioned • Cements and glues space. Use Doublewall Type B vent pipe through • Antistatic fabric softeners for clothes dryers • unconditioned space such as attics and crawl Masonry acid washing materials spaces.
- Page 7 6. The furnace shall be connected to a factory-built 14. All vent pipe run through unconditioned areas or chimney or vent complying with a recognized stan- outside shall be constructed of factory-built chimney dard, or a masonry or concrete chimney lined with a sections (see Figure 8).
- Page 8 A return air duct system is recommended. If the unit is For Canadian installations, only the Field Controls installed in a confined space or closet, a return connection venter and control kit mentioned above are autho- must be run, full size, to a location outside the closet. The rized by CSA for use with this furnace.
- Page 9 Sidewall Vent Terminal Clearances 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 n i l...
- Page 10 For units that do not include a side return filter rack, kit AFILT524 can be used. Bottom filter kit AFILT529 can be used with all G1N80BU, G1N80BT, 3. Drop the duct connections through the top of the base assembly with the right angle flanges in good contact CG80UB, and CG80TB series furnaces.
- Page 11 Combustible Floor Installation Filter Rack Installation (Counterflow Models Only) Filter Rack Mounting Hole Screw Base Furnace Assembly Filter Rack Woven Front of Cabinet Duct Corner Embossments Glass Tape Combustible Flooring Figure 13 1" installer’s responsibility to install properly sized filters in accordance with Table 1 on page 12.
- Page 12 (see Figure 15). The screws must be re-installed in the Minimum Filter Requirements vest panel after the inserts are removed. Insert Location 1. The Airflow Descriptor is the two digits following the “D” in the model number. 2. Areas and dimensions shown for permanent filters are based on filters rated at 600 feet per minute face velocity.
- Page 13 in the gas line, outside the unit, 5' above the floor, or in After gas piping is complete, carefully check all piping accordance with any local codes. A test gauge connection connections (factory and field) for gas leaks. Use a leak must be installed with a 1/8"...
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Page 14: Start-Up
Continuous Blower Operation What to do if you smell gas: If continuous blower operation on low speed is desired, Do not try to light any appliances. • connect the lowest speed motor tap to the “CONT” terminal Extinguish any open flame. •... -
Page 15: Operation
It is an automatic reset control. At the end of the fan “on” call the thermostat de-energizes the R-G circuit of the control, causing the fan to be de- G1N80BU and CG80UB models do not include an auxiliary energized immediately. limit control. -
Page 16: Maintenance
For Natural Gas: Check the furnace rate by observing the Blower Control Board gas meter, when available, making sure all other gas The blower control board operates the circulating air appliances are turned off. The test hand on the meter blower, the combustion blower, and any accessories should be timed for at least one revolution. - Page 17 Manifold Pressure vs. Altitude Manifold Pressure vs. Altitude (G1N80BU150 and CG80UB150 only) i t l ) . t i t l ) . t * Consult local utility for actual heating value. * Consult local utility for actual heating value. Furnace Input = Input Factor x Nameplate Input Furnace Input = Input Factor x 148,000 Above 7500 feet, call Technical Services at 1-800-448-...
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Page 18: Control System Diagnostics
CONTROL SYSTEM DIAGNOSTICS Fault Code History Button The control stores the last five fault codes in memory. A Troubleshooting pushbutton switch is located on the control (see Figure 18). The following visual checks should be made before When the pushbutton switch is pressed and released, the troubleshooting: control flashes the stored fault codes. -
Page 19: Wiring Diagrams
Connection Diagram P/N 45198-005 Figure 18 # 45464K003 Page 19... - Page 20 Schematic Diagram P/N 45198-005 Figure 19 Page 20 # 45464K003...
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