506305-01
Page 3 of 36
Issue 0938
INSTALLATION
These instructions must be placed on or near the furnace in
a conspicuous place.
The furnace design is certified by CSA International as a
Category IV furnace in compliance with the latest edition of
American National Standard Z21.47/CSA Standard 2.3 for
Gas-Fired Central Furnaces, for operation with natural gas
or propane. Consult the rating plate on the furnace for gas
type before installing.
The maximum hourly heat loss of space shall be calculated
in accordance with the procedure described in the current
manuals of Air Conditioning Contractors of America, or by
any other recognized method which is suitable for local
conditions, provided the results obtained are in substantial
agreement with, and not less than, those obtained using the
procedure described in the manuals.
G1D91BU and G1D93BU models shall be installed only as
upflow furnaces. G1D93BC models shall be installed only
as counterflow (downflow) furnaces.
G1D91BT and G1D93BT models may be installed as upflow
or horizontal right to left or left to right airflow furnaces. When
installed horizontally, the installer must install a sheet metal
screw to retain the upper door as shown in Figure 1.
Never install any furnace on its back.
To avoid property damage caused by condensate drain
blockage, install a field-fabricated auxiliary drain pan with a
separate drain line to the outside under the entire furnace
and drain system. Install according to local codes.
All models are suitable for closet or utility room installation.
The furnace is suitable for installation in buildings constructed
on-site. The furnace should be centralized in respect to the
heat distribution system as much as practicable. When
installed in a utility room, the door should be wide enough to
allow the largest part of the furnace to enter, or permit the
replacement of another appliance, such as a water heater.
A gas-fired furnace for installation in a residential garage must
be installed so the burner(s) and the ignition source are located
not less than 18" above the floor. The furnace is to be located
or protected to avoid physical damage by vehicles.
This furnace is not recommended to be used as a construction
heater during any phase of construction. Very low return air
temperatures, harmful vapors, and operation of the unit with
clogged or misplaced filters will damage the unit.
The furnace may be used for heating of buildings or structures
under construction, if the following conditions are met:
•
The vent system must be permanently installed per these
installation instructions.
•
A room thermostat must control the furnace. The use of
fixed jumpers that will provide continuous heating is not
allowed.
•
The return air duct must be provided and sealed to the
furnace.
Inspection of Shipment
This furnace is shipped in one package, completely
assembled and wired. The thermostat is shipped in a
separate carton when ordered.
Upon receipt of equipment, carefully inspect it for possible
shipping damage. If damage is found, it should be noted on
the carrier’s freight bill. Damage claims should be filed with
the carrier immediately. Claims of shortages should be filed
with the seller within 5 days.
Location
To provide proper operation and satisfactory performance, care
must be taken in choosing the location for this furnace. The
atmosphere in which the furnace operates must be free of
contaminants such as chlorides and sulfates.
The furnace must be installed so that electrical components
are protected from water. Unit must be level for proper
condensate drainage.
The condensate drain on this furnace is incorporated
within the furnace and must be primed before start-up.
The condensate system must not be exposed to
temperatures under 32°F. Use of heat tape is
permissible provided the rate temperature of the tape
does not exceed 155°F.
WARNING
Horizontal Installations
Figure 1
HORIZONTAL RIGHT TO
LEFT AIRFLOW SHOWN
