To ensure proper furnace operation, you must install, operate and
maintain the furnace in accordance with these installation and
operation instructions, all local building codes and ordinances. In
their absence, follow the latest edition of the National Fuel Gas
Code (NFPA 54/ANSI Z223.1), and/or CAN/CSA B149 Installation
Codes, local plumbing or waste water codes and other
A copy of the National Fuel Gas Code (NFPA 54/ANSI Z223.1)
can be obtained from any of the following:
American National Standards Institute
New York, NY 10018
National Fire Protection Association
1 Batterymarch Park
Quincy, MA 02269
8501 East Pleasant Valley
Cleveland, OH 44131
A copy of the CAN/CSA B149 Installation Codes can also be
178 Rexdale Boulevard
Etobicoke, Ontario, Canada M9W 1R3
LOCATION REQUIREMENTS AND CONSIDERATIONS
Your unit model type determines which installation procedures
must be used. For WGFM28 models, you must follow instructions
for horizontal left, horizontal right or upflow installations only.
These furnaces are not approved for downflow installations.
Downflow models WGFD28 are not approved for horizontal or
upflow installations. For these models, use only the instructions
for downflow installation only.
To prevent possible equipment damage, property damage,
personal injury or death, the following bullet points must
be observed when installing the unit.
Follow the instructions listed below when selecting a furnace
location. Refer also to the guidelines provided in "Combustion
and Ventilation Air Requirements."
Centrally locate the furnace with respect to the proposed or
existing air distribution system.
Check that the temperature of the return air entering the
furnace is between 55°F and 100°F (12.8ºC and 37.8ºC) when
the furnace is heating.
Provide provisions for venting combustion products outdoors
through a proper venting system.
NOTE: The length of flue piping can be a limiting factor in the
location of the furnace.
Ensure that adequate combustion air is available for the
furnace. Improper or insufficient combustion air can expose
the building occupants to gas combustion products that
could include carbon monoxide. Refer to "Combustion and
Ventilation Air Requirements."
Set the furnace on a level floor. If the floor becomes wet or
damp at times, place the furnace above the floor on a
concrete base sized approximately 1¹⁄₂" (3.8 cm) larger than
the base of the furnace.
The rated heating capacity of the furnace should be greater than
or equal to the total heat loss of the area to be heated. The total
heat loss should be calculated by an approved method or in
accordance with "ASHRAE Guide" or "Manual J-Load
Calculations" published by the Air Conditioning Contractors of
In the U.S.A., this furnace must be installed in accordance with
the latest edition of the ANSI Z223.1 booklet titled "National Fuel
Gas Code" (NFPA 54), and the requirements or codes of the local
utility or other authority having jurisdiction. In Canada, this
furnace must be installed in accordance with the current CAN/
CGA-B149.1 and 2 Gas Installation Codes, local plumbing or
waste water codes and other applicable codes. Additional helpful
publications available from the NFPA are, NFPA 90A—Installation
of Air Conditioning and Ventilating System and NFPA 90B—Warm
Air Heating and Air Conditioning System.
All venting shall be in accordance with PART 7, Venting of
Equipment, of the National Fuel Gas Code, ANSI Z223.1, or
applicable local building and/or air conditioning codes. These
publications are available from:
National Fire Protection Association, Inc.
1 Batterymarch Park
Quincy, MA 02269
NOTE: Furnaces with NOx screens meet the California NOx
emission standards and California seasonal efficiency standards.
Annual inspections of the furnace and its vent system is strongly
Ensure that the upflow or horizontal furnaces are not installed
directly on carpeting, or any other combustible material.
NOTE: The only combustible material allowed is wood.
Exposure to contaminated combustion air will result in safety
and performance-related problems.
NOTE: Do not install the furnace where the combustion air is
exposed to the following substances:
Chlorinated waxes or cleaners
Chlorine-based swimming pool chemicals
Water softening chemicals
Deicing salts or chemicals
Cleaning solutions (such as perchloroethylene)
Cements and glues
Antistatic fabric softeners for clothes dryers
Masonry acid washing materials
If the furnace is used in connection with a cooling coil unit,
install the furnace upstream or in parallel with the cooling coil
unit. Premature heat exchanger failure will result if the cooling
coil unit is placed ahead of the furnace.
If the furnace is installed in a residential garage, position the
furnace so that the burners and ignition source are located
not less than 18" (45.7 cm) above the floor. Protect the
furnace from physical damage by vehicles.
If the furnace is installed horizontally, ensure that the furnace
access doors are not on the "up/top" or "down/bottom" side
of the furnace.
Do not connect the furnace to a chimney flue that serves a
separate appliance designed to burn solid fuel.