GCSS96 Installation Manual

9
Most homes will require outside air be supplied to the furnace
area by means of ventilation grilles or ducts connecting directly
to the outdoors or spaces open to the outdoors such as attics or
crawl spaces.
I NSTALLATION P OSITIONS
This furnace may be installed in an upright position or horizon-
tal on either the left or right side panel. Do not install this
furnace on its back. For upright upflow furnaces, return air
ductwork may be attached to the side panel(s) and/or basepan.
For horizontal upflow furnaces, return air ductwork must be
attached to the basepan. For both upright or horizontal coun-
terflow furnaces, return ductwork must be attached to the
basepan (top end of the blower compartment). NOTE: Ductwork
must never be attached to the back of the furnace. Contact
your distributor for proper airflow requirements and number of
required ductwork connections. Refer to “Recommended In-
stallation Positions” figure for appropriate installation positions,
ductwork connections, and resulting airflow arrangements.
H ORIZONTAL A PPLICATIONS & C ONSIDERATIONS
2" 2" 3/8" ANGLE IRON
(3 PLACES )
XX
Figure 2
When installing a furnace horizontally, additional consideration
must be given to the following:
FURNACE S USPENSION
If suspending the furnace from rafters or joists, use 3/8" threaded
rod and 2”x2”x1/8” angle iron as shown in the following dia-
gram. The length of rod will depend on the application and the
clearances necessary.
If the furnace is installed in a crawl space it must be suspended
from the floor joist or supported by a concrete pad. Never install
the furnace on the ground or allow it to be exposed to water.
FRONT COVER PRESSURE SWITCH TUBE LOCATION
When a furnace is installed horizontally with left side down,
the front cover pressure switch tube must be re-located to
the lower port of the collector box cover.
1. Remove tube from front cover pressure switch and
collector box cover.
2. Remove rubber plug from bottom collector box port
and install on top collector box port.
3. Locate 24” x 1/4” tube in bag assembly.
4. Install one end on front cover pressure switch.
5. Route tube to lower port on collector box cover and
cut off excess tubing.
DRAIN TRAP AND LINES
In horizontal applications the condensate drain trap is secured to
the furnace side panel, suspending it below the furnace. A mini-
mum clearance of 5.5” below the furnace must be provided for
the drain trap. Additionally, the appropriate downward piping
slope must be maintained from the drain trap to the drain loca-
tion. Refer to Condensate Drain Trap and Lines for further de-
tails. If the drain trap and drain line will be exposed to tempera-
tures near or below freezing, adequate measures must be taken
to prevent condensate from freezing.
LEVELING
Leveling ensures proper condensate drainage from the heat ex-
changer. For proper flue pipe drainage, the furnace must be level
lengthwise from end to end. The furnace should have a slight
tilt from back to front with the access doors downhill fromthe
back panel approximately 1/2 to 3/4 inches. The slight tilt
allows the heat exchanger condensate, generated in the
recuperator coil, to flow forward to the recuperator coil frontcover.
ALTERNATE VENT/FLUE AND COMBUSTION AIR CONNECTONS
In horizontial installations provisions for alternate flue and
combustion air piping are available for upflow furnaces with
left discharge and counterflow furnaces with right air dis-
charge. This configuration allows thye flue and combustion
air piping to be run vertically through the side of the fur-
nace. Refer to the “Recommended Installation Positions” fig-
ure for further detail. The standard piping connections may
also be used in these positions. Refer to Vent/Flue Pipe and
Combustion Air Pipe for details concerning the conversion to
the alternate vent/flue and combustion air connections.
When using the horizontal alternate vent configuration, you
must use the RF000142 vent drain kit. See following illus-
tration.