10
FURNACE INSTALLATION
G7XA series gas furnaces are shipped ready for installation
in the upfl ow or horizontal right or left positions. Access
for positioning and servicing must be considered when
locating the unit. See Table 1 (page 5) for the required
clearances needed to move the furnace to its installation
point (hallways, doorways, etc).
WARNING:
The furnace must not be installed directly on
carpeting, tile, or any combustible material other
than wood fl ooring.
General Requirements
• The furnace must be leveled at installation and attached
to a properly installed duct system. Refer to pages
8 - 9 for venting and circulating air requirements
• The furnace must be installed so that all electrical
components are protected from water.
• The furnace must be installed upstream from a
refrigeration system.
Upfl ow Installation
Side Return Air Inlet
This gas furnace is shipped with the bottom panel installed
(Figure 16, page 21). If the upfl ow furnace is installed with
side return air, the bottom panel must not be removed.
Bottom Return Air Inlet
If the furnace is installed where the bottom is the return
air inlet, the bottom panel must be removed. See Bottom
Panel Removal section.
Horizontal Installation
This gas furnace can be installed horizontally in an attic,
basement, crawl space or alcove (Figure 6). It can also
be suspended from a ceiling in a basement or utility
room in either a right to left airfl ow or left to right airfl ow
as shown in Figure 7.
The furnace is shipped with the bottom panel installed. If
furnace is installed horizontally, remove the bottom panel
from the furnace before attaching the duct system. See
Bottom Panel Removal section.
If the furnace will be suspended from the ceiling, assemble
a support frame (Figure 7) using slotted iron channel and
full threaded rod. Fasten the frame together with nuts,
washers, and lockwashers. Secure the support frame to the
rafters with lag bolts. The furnace can also be suspended
using steel straps around each end of the furnace. The
straps should be attached to the furnace with sheet metal
screws and to the rafters with bolts.
If the furnace is to be installed in an attic, it is required that
a drip pan be placed under the furnace. If the installation
is on a combustible platform (Figure 6), it is recommended
that the drip pan extend at least 12 inches past the top
and front of the furnace.
Note:
It is recommended for further reduction of fi re hazard
that cement board or sheet metal be placed between the
furnace and the combustible fl oor and extend 12 inches
beyond the front of the door and top of the furnace.
Figure 6. *XA Horizontal Installation on a Platform
Gas Inlet
Combustible
Platform
Type “B” Vent
Coil Plenum
Electrical Supply
Connection
Bottom Panel Removal
The steps listed below explain how to remove the bottom
panel from the furnace. See Figure 8 (page 11).
1. Remove the door (1) from the blower compartment.
2. Disconnect the blower motor wiring harness (2) from
the control board.
3. Remove two screws (3) securing the blower assembly
(4) to the furnace.
4. Carefully pull the blower assembly (4) out thru the
front of the furnace.
5. Remove all screws (5) securing bottom panel (6) to
bottom of furnace and front brace (7).
6. Lift up and slide bottom panel (6) out through front of
furnace.
7. Reinstall the blower assembly (4) in reverse order.
Threaded
Rod
Lag
Bolt
Nuts (x2)
Washer
and
Lockwasher
Nuts (x2)
Figure 7. *XA Horizontally Suspended
in Attic or Crawl Space
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