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Furnace
Cabinet
Input
Width
(Btuh)
(in.)
60,000
19.75
80,000
19.75
92,000
19.75
110,000
22.50
* Time-delay fuses or HACR-type circuit breakers are required.
The thermostat controller must not be installed
on an outside wall or any other location where
its operation may be adversely affected. Adverse
effects include radiant loading from fireplaces,
sunlight, or lighting fixtures, and convective load-
ing from warm air registers or electrical appli-
ances.
START-UP AND ADJUSTMENTS
Prior to start-up, verify that:
1.
The line voltage power leads are securely
connected, that the polarity of the connec-
tions is correct, and that the furnace is
properly grounded.
2.
The thermostat wires (A, B, C and R) are
securely connected to the correct leads on
the terminal strip of the interface board. (R,
DX+, DX- and Gnd. (See Figure 22.)
3.
The gas line service pressure does not
exceed 10.0 in. water column (0.36 psig),
INTERFACE
BOARD
Nominal
Maximum
Electrical
Operating Operating
Supply
Voltage
115-60-1
127
115-60-1
127
115-60-1
127
115-60-1
127
Table 10. Electrical Data
ROUTE WIRES
THRU RING CORE
RED
R
YELLOW
DX+
DX-
WHITE
GREEN
GND
Figure 22. Thermostat wiring in field
Minimum
Maximum
Minimum
Furnace
Voltage
Amperes
Gauge
103
12
103
12
103
12
103
12
and is not less than 4.5 in. water column
(0.16 psig) for natural gas. For LP gas the
line service pressure must not exceed 14
in. water column (0.51 psig), and must not
be less than 11.0 in. W.C. (0.40 psig).
4.
The roll-out and vent safety manual reset
switches are closed. If necessary, press
the red button to reset a switch. See Figure
26 for location. DO NOT install a jumper
wire across a switch to defeat its function.
If a switch reopens on start-up, DO NOT
reset the switch without identifying and
correcting the fault condition which caused
the switch to trip.
5.
The blower door is in place, closing the door
switch in the line voltage circuit.
6.
The gas line has been purged and all
connections are leak tight.
C
W2
RH
R
W1
H
Maximum
Wire
Fuse or Circuit
Breaker Amps*
14
15
14
15
14
15
14
15
A
B
GD
OD
ID
GD
27
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