506305-01 Page 1 of 36Issue 0938
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TABLE OF CONTENTS
SAFETY ...............................................................2
INSTALLATION ....................................................3
START-UP ..........................................................26
OPERATION ......................................................27
MAINTENANCE .................................................30
REPAIR PARTS..................................................31
CONTROL SYSTEM DIAGNOSTICS.................32
WIRING DIAGRAMS..........................................33
INSTALLATION INSTRUCTIONS
G1D91BU, G1D91BT, G1D93BU, G1D93BT & G1D93BC
High Efficiency 90+ Condensing Gas Furnace
With System Sentry™ Control System
Manufactured By
Allied Air Enterprises Inc.
A Lennox International Inc. Company
215 Metropolitan Drive
West Columbia, SC 29170
*506305-01*
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.
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 property damage, personal injury, or death.
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
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
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