GC9C96 Service Manual
SYSTEM OPERATION
6
POSITION*S IDES REAR FRONTB OTTOMF LUET OP
Upflow 0" 0" 1" C0 "1 "
Horizontal 6" 0" 1" C0 "6 "
*M9C96 M INIMUM CLEARANCES TO COMBUSTIBLE M ATERIALS
POSITION*S IDES REAR FRONTB OTTOMF LUET OP
Counterflow0 "0 "1 "N C0 "
Horizontal 6" 0" 1" C0 "6 "
*C9C96 M INIMUM CLEARANCES TO COMBUSTIBLE M ATERIALS
• C = If placed on combustible oor, oor MUST be wood only.
• NC = For installation on non-combustible oors only. A combustible
subbase must be used for installations on combustible ooring.
• For servicing or cleaning, a 24” front clearance is recommended.
• Unit connections (electrical, ue, and drain) may necessitate greater
clearances than the minimum clearances listed above.
• In all cases, accessibility clearance must take precedence over from
the enclosure where accessibility clearances are greater.
• Approved for line contact in the horizontal position.
A two stage heat/cool thermostat is recommended. A single
stage heating thermostat may be used. It is recommended
that a high quality thermostat with a “C” terminal is used to
operate the furnace.
T
In an area having good air circulation, locate the thermostat
about ve feet high on a vibration-free inside wall. Do not
install the thermostat where it may be inuenced by any of
the following:
• Drafts, or dead spots behind doors, in corners, or under
cabinets.
• Hot or cold air from registers.
• Radiant heat from the sun.
• Light xtures or other appliances.
• Radiant heat from a replace.
• Concealed hot or cold water pipes, or chimneys.
• Unconditioned areas behind the thermostat and
dehumidistat, such as an outside wall.
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Improved construction and additional insulation in buildings
have reduced heat loss by reducing air inltration and escape
around doors and windows. These changes have helped in
reducing heating/cooling costs but have created a problem
supplying combustion and ventilation air for gas red and
other fuel burning appliances. Appliances that pull air out
of the house (clothes dryers, exhaust fans, replaces, etc.)
increase the problem by starving appliances for air.
When the furnace is installed as a direct ven (2-pipe) furnace,
no special provisions for air for combustion are required.
However, if this furnace is to be installed in the same space
with other gas appliances, such as a water heater, ensure
there is an adequate supply of combustion and ventilation
air for the other appliances. Refer to the latest edition of the
National Fuel Gas Code NFPA 54/ANSI Z223.1 or CAN/
CGA B149 Installation Codes, or applicable provisions of
the local building codes for determining the combustion air
requirements for the appliances.
*M9C96 models may be installed up ow or horizontally with
left or right side down. *C9C96 models may be installed down
ow or horizontally with left or right side down. Do not install
any furnace on its back.
Horizontal applications, in particular, may dictate many of
the installation’s specics such as airow direction, ductwork
connections, ue and/or combustion air pipe connections, etc.
The basic application of this furnace as a horizontal furnace
diers only slightly from an upright installation.
1. Horizontal installations require 5.5” under the furnace to
accommodate the drain trap.
2. Horizontal furnaces must be installed with ¾” slope from
back to front to permit condensate ow towards the front
of the furnace.
When installing horizontally with the left side down, there
are two options for connecting the vent pipe to the furnace.
1. Venting may be connected to the furnace vent pipe tting
on the original top (now the end) of the furnace
2. The internal vent pipe and elbow may be removed from
the furnace to permit the vent to exit the top (original side)
of the furnace. If this option is used, an RF000142 Vent-
Drain coupling must be used to keep condensate from
collecting in the inducer assembly
Refer to the following instructions and illustration.
Insert flange. Cut 2 ½” long.
R 000142F
Figure 9