ICM Controls ICM2805A Installation, Operation & Application Manual

INSTALLATION, OPERATION & APPLICATION GUIDE
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G3RC AND G4 FURNACE MODELS
1. Turn off the power supply to the furnace by removing the fuse or
turning off the circuit breaker.
2. Remove the wires and connectors from the old board one at a time.
Carefully connect them to the ICM2805A to prevent a miswire.
Remove the mounting screws and then remove the old control board.
3. Place the template (on the back of this sheet) in the control box and
secure with tape. Move all wires out of the way and carefully drill four
3/16" diameter holes as shown on the template. Remove and discard
the template.
4. Mount the ICM2805A with the fuse at the top by inserting the
standoffs into the mounting holes.
NOTE: Do not flex the ICM2805A circuit board. Apply pressure only at
the standoffs.
5. Disconnect the 6-pin connector plug. Using an AMP extractor tool #
458994-2 remove the blue wire from socket position #4 and install
it in position #1. (see diagram at right). If the tool is not available
proceed as follows:
Cut off the blue wire at socket position #4 in the connector (see
diagram at right), and strip the insulation back 3/8". Insert the
length of blue wire provided in socket position #1, next to the cut off
blue wire. Reconnect the 6-pin connector plug. Connect the loose
ends of the blue wires using the wire nut provided. Tape the wire nut
connection with electrical tape so it cannot loosen.
6. Apply the new wiring diagram for G4 furnaces supplied with the
ICM2805A to the inside of the cabinet.
7. Turn on the power supply and check the furnace for proper operation.
MODIFICATION
IS REQUIRED FOR
G3RC AND G4
MODELS ONLY.
White wire
If the P2 plug has
Black wire
4 black wires
in positions
1 and 4, 3 and 6;
the modification
is not required.
(SEE FIG. 1)
Existing Blue wire
(previously cut from slot 4)
Inserted Blue wire
(provided)
1
Blue wire cut
2
3
4
5
6
6-pin wire connector
DANGER:
This board should be installed by a qualified techni-
cian only. Failure to follow these instructions could lead to prop-
erty damage, personal injury or death.
CAUTION:
Disconnect the power supply by turning off a circuit
breaker or removing a fuse before attempting to install this board.
G5 FURNACE MODELS
1. Turn off the power supply to the furnace by removing the fuse or
turning off the circuit breaker.
2. Remove the wires and connectors from the old board one at a time.
Carefully connect them to the ICM2805A to prevent a miswire.
Remove the control bracket mounting screws from the outside of
the cabinet (except G5RL models). Install the new control bracket
and then proceed to step 4. If the screws are not accessible, new
mounting holes must be drilled in the existing mounting bracket
using the template on the back of this instruction sheet.
3. Remove the screw securing the old control board and then remove
the old control board. Place the template (on the back of this sheet)
over the mounting bracket and secure with tape. Move all wires out of
the way and carefully drill four 3/16" diameter holes as shown on the
template. Remove and discard the template.
4. Mount the ICM2805A with the fuse at the top by inserting the
standoffs into the mounting holes.
NOTE: Do not flex the ICM2805A circuit board. Apply pressure only at
the standoffs.
5. Apply the new wiring diagram for G5 furnaces supplied with the
ICM2805A to the inside of the cabinet.
6. Turn on the power supply and check the furnace for proper operation.
G6, M2 & M3 FURNACE MODELS
1. Turn off the power supply to the furnace by removing the fuse or
turning off the circuit breaker.
2. Remove the wires and connectors from the old board one at a time.
Carefully connect them to the ICM2805A to prevent a miswire.
3. Remove the old board by cutting off the standoffs. Install the
ICM2805A in the same position by snapping the standoffs into the
mounting holes.
NOTE: Do not flex the ICM2805A circuit board. Apply pressure only at
the standoffs.
4. Turn on the power supply and check the furnace for proper operation.
Insert Blue wire
(provided)
White wire
Black wire
3
Figure 1
ICM2805A
Furnace Control Board
(NO MODIFICATIONS REQ.)
(NO MODIFICATIONS REQ.)
Existing Blue wire
(to be cut & connected
to wire provided)
1
Cut existing
2
blue wire here
4
5
6
6-pin wire connector