Locating The Furnace; Upflow Furnaces; Horizontal Furnaces - Heat Controller 80+ AFUE Installation Instructions Manual

Locating the Furnace

• The dimensions of the room or alcove must be able to
accommodate the overall size of the furnace and required
clearances to combustible materials listed in Figure 1
(page 5). Access for positioning and servicing must also
be considered when locating the unit. To determine
the required clearances needed for installation, refer
to Figure 18 (page 26) for overall dimensions.
• The furnace must be installed on a solid surface and must
be level front-to-back and side-to-side at installation. The
surface that the furnace is mounted on must provide
sound physical support of the unit. Secure the furnace
to the floor.
• The furnace should be installed as close to the center of
the air distribution system as possible and attached to
a properly installed duct system. Do not use the back
of the furnace for return air. See pages 11 - 12 for
circulating requirements.
• The furnace must be installed so that all electrical
components are protected from water.
• The plenum attached to the A/C coil box and ductwork
within 3 ft. of the furnace must be installed so that
surfaces are at least 1" from combustible construction.
• When installed in a residential garage, the furnace must
be positioned so the burners and the source of the
ignition are located no less than 18 inches above the
floor and protected from physical damage by vehicles.
• The furnace must be installed upstream from a
refrigeration system.
• The furnace requires special venting materials and
installation procedures. See pages 9 & 10 for venting
guidelines and specifications.

Upflow Furnaces

wARNING:
The furnace must not be installed directly on
carpeting,tile,or any combustible material other
than wood flooring.Failure to comply may result
in fire, property damage or personal injury.
GUH80A series gas furnaces are shipped with the bottom
panel installed as shown in Figure 18 (page 26). If the
furnace is installed with side return air, the bottom panel
must not be removed. If the furnace is installed with bottom
return air, the bottom panel must be removed. See Bottom
Panel Removal on page 15.

Horizontal Furnaces

wARNING:
The furnace must not be installed directly on
carpeting,tile,or any combustible material other
than wood flooring.
• The GUH80A series gas furnace can be installed
horizontally (Figure 7) in an attic, basement, crawl space
or alcove. It can also be suspended from a ceiling in a
basement or utility room in either a right to left airflow
or left to right airflow as shown in Figure 8.
• GUH80A series furnaces are shipped with the bottom
panel installed. If the furnace is installed horizontally,
remove the bottom panel from the furnace before
attaching the duct system. See Bottom Panel Removal
on page 15.
• If installing the furnace in an attic, it is required that a
drip pan be placed under the furnace. If the installation is
on a combustible platform (Figure 7), it is recommended
that the drip pan extend at least 12 inches past the top
and front of the furnace.
• If suspending the furnace from the ceiling, assemble a
support frame (Figure 8) 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.
• It is recommended for further reduction of fire hazard
that cement board or sheet metal be placed between the
furnace and the combustible floor and extend 12 inches
beyond the front of the door and top of the furnace.
Electrical Supply
Connection
Type "B" Vent
Coil Plenum
Figure 7. GUH80A Horizontal Installed
on a Platform
Gas Inlet
Wood or
non-combustible
Platform
13