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115-V FIELD-
SUPPLIED
DISCONNECT
BLK
BLK
WHT
WHT
GND
JUNCTION
BOX
GREEN
DEHUM
NOTE 5
The gas service pressure must not exceed 0.5 psig (14-in. wc), and
no less than 0.16 psig (4.5-in. wc).
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. Y/Y2 and G are required to be
connected to the furnace for cooling and heat pumps. G is required
for continuous-fan. C
24v is required for some clock thermo-
OM
stats. These connections must be made at the 24-v terminal block
on furnace control. (See Fig. 15.) O is required for heat pumps
only. Y1 is required for 2-stage cooling and 2-stage heat pumps.
The O and Y1 connectors must be made to the ICM2+ furnace's
orange and blue leads, flagged "O" and "Y1," respectively.
This furnace can be installed with either a single-stage heating or
a 2-stage heating thermostat.
For single-stage thermostats, connect thermostat R to W/W1 at the
furnace control terminal block. (See Fig. 16.) 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-stage for optimum comfort. Setup switch-2 (SW-2) must be
in the factory-shipped OFF position. See Fig. 18 and Tables 6 and
7 for setup switch information.
If a 2-stage heating thermostat is to be used, move SW-2 to the ON
position at end of furnace installation. This overrides built-in
control process for selecting high- and low-stage and allows the
2-stage thermostat to select gas heating modes. The W2 from
thermostat must be connected to W2 on control terminal block.
(See Fig. 17.)
NOTE 2
C
W2
W1
SEVEN
WIRE
FOUR-WIRE
HEATING-
ONLY
W2
COM
W/W1
NOTE 1
Y/Y2
R
CONTROL
G
AFS
Y1
24-V
TERMINAL
BLOCK
FURNACE
NOTE 4
O
Fig. 17—Heating and Cooling Application Wiring Diagram:
2-Stage Thermostat and Two-Speed Condensing Unit
FIELD 24-V WIRING
FIELD 115-, 208/230-, 460-V WIRING
FACTORY 24-V WIRING
FACTORY 115-V WIRING
2-STAGE
THERMOSTAT
Y2
R
G
Y1
TERMINALS
C
Y1
Y2
2-SPEED
CONDENSING
UNIT
NOTES: 1.
Connect Y1 and Y/Y2 as shown for proper operation.
2.
Some thermostats require a "C" terminal connection as shown.
3.
If any of the original wire, as supplied, must be replaced, use
same type or equivalent wire.
4.
Connect O to thermostat-O only for heat pump applications.
5.
Field-supplied humidistat for dehumidification in cooling (optional).
4
BLOWER-
OFF
DELAY
Fig. 18—Setup Switches on Furnace Control
Table 7—Blower-Off Delay Setup
DESIRED HEATING
MODE BLOWER-OFF
DELAY (SEC)
90
135
180
225
13
FIELD-SUPPLIED
FUSED DISCONNECT
208/230- OR
460-V
THREE
PHASE
208/230-V
SINGLE
PHASE
GND
3
2
LOW
HEAT
(ADAPTIVE
ALGORITHM)
(Factory Settings)
Switch (SW) Position
SETUP SWITCH
SW-3
OFF
OFF
ON
ON
A99232
1
OFF
ON
HIGH
HEAT
ONLY
A96402
SW-4
OFF
ON
OFF
ON
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