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VENT
COMBUSTION AIR
Fig. 46—Sidewall Termination of 12 in. or Less
(Dimension "A" is Touching or 2-in. Maximum
Separation)
VENT
COMBUSTION AIR
A
Fig. 47—Sidewall Termination of More than 12 in.
(Dimension "A" is Touching or 2-in Maximum
Separation)
5. When using field-supplied heat tape, follow heat tape
manufacture's instructions for all other installation guide-
lines.
START-UP ADJUSTMENT AND SAFETY CHECK
CAUTION: Furnace control must be grounded for
proper operation, or control will lock out. Control is
grounded through green wire routed to gas valve and
burner box screw.
I. GENERAL
The furnace must have a 115-v power supply properly connected
and grounded. Proper polarity must be maintained for correct
operation.
NOTE: Proper polarity must be maintained for 115-v wiring. If
polarity is incorrect, control status indicator light will flash rapidly
and the furnace will not operate.
The gas service pressure must not exceed 0.5 psig (14-in. wc), and
no less than 0.16 psig (4.5-in. wc).
COMBUSTION AIR
A
A96129
COMBUSTION AIR
A96130
OPEN STAND
PIPE FOR
A/C OR
HUMIDIFIER
DRAIN
TEE
TO OPEN
DRAIN
Fig. 48—Example of Field Drain Attachment
CONDENSATE TRAP
WIRE TIE(S)
HEAT TAPE
(3 WRAPS MINIMUM)
Fig. 49—Condensate Trap Heat Tape
Thermostat wire connections at R and W/W1 are the minimum
required for gas heating operation. W2 must be connected for
2-stage heating thermostats. COM, Y/Y2, and G are required for
cooling, heat pumps, and some clock thermostats. These must be
made at the 24-v terminal block on the control. (See Fig. 32.)
This furnace can be installed with either a single-stage heating or
a 2-stage heating thermostat.
For single-stage thermostats, connect thermostat W to W/W1 at
furnace control terminal block. (See Fig. 27.) For single-stage
thermostats, the control will determine, based on length of previ-
ous heating on and off cycles, when to operate in low- and high-
gas heat for optimum comfort. Setup switch-2 (SW-2) must be in
the factory-shipped OFF position. See Fig. 50 and Tables 8 and 9
for setup switch information.
—32—
A94054
A93036
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