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MOLEX 7-PIN
CONNECTOR (1)
electric heating signal will appear at motor connector pin 1 as
described previously. If necessary, the motor will modify its
airflow output to provide an airflow which is defined as safe for
operation of electric heater.
H. CFM Select Configuration Taps
The CFM Select taps are used by installer to configure system. The
ICM2 is capable of discerning wave shapes on some of its inputs
and uses this capability to modify its operation to a pre-
programmed table of airflows and can be modified in response to
other inputs such as the need for de-humidification.
I. ICM2 Control Power
The ICM2 control power is supplied from R circuit through
printed-circuit runs to motor control connector pin 6, through
motor control harness to motor. The C side of low-voltage control
power circuit is connected by printed-circuit runs to motor
connector pins 4 and 5, then through motor control harness to
motor.
J. Low-Voltage Circuit Fusing and Reference
The low-voltage circuit is fused by a board-mounted 5-amp
automotive-type fuse placed in series with transformer SEC2 and
R circuit. The C circuit of transformer is referenced to chassis
ground through a printed-circuit run at SEC1 connected to metal
standoff marked GROUND SCREW REQUIRED.
NOTE: A ground screw must be in place or erratic motor
operation can result.
K. Transformer, Motor, and Electric Heater
Power Connections
The high-voltage (230-vac) power input to board is provided
through electric heater connector pins 7 and 9. The high voltage is
then connected through printed-circuit runs to motor power con-
LOW VOLTAGE
TERMINAL BLOCK
EASY SELECT
AUX
HEAT
KW
0-30
0-20
CFM
1200
1000
VIO
AC/HP
042
036
BLU
TYPE
AC
HP-COMFORT
ORN
AC/HP
CFM
LO
BLK
AC/HP TIME
ON
0
30
OFF
90
90
GRY
RED
GROUND
SCREW
SEC2
REQUIRED
24VAC
XFORM
3
⁄
-IN. MALE
16
T1
MOTOR
FASTON
M1
AMP–TYP
240
(21) PLCS
VAC
M2
240
T2
VAC
T3
Fig. 16—Easy Select Board
5 AMP
ST1
MAX
RANGE
0-10
0-5
L
800
600
R
SIZE
030
024
C
FS1
D10
O
HP-EFF
Y/Y2
R1
ADJUST
MED
HI
Y1
DELAY
G
0
ENH
0
D11
JW2
E
W2
R3
MOTOR
W3
JW1
24VDC
JW3
P2
HUM1
AUX1
SEC1
JW4
D3
AUX2
HUM2
R2
HEATER
D2
D9
D4
P1
D8 D7 D5
D6
D1
CES0130007–00
AMP 12-PIN MATE-N-LOCK
CONNECTOR (1)
nections M1 and M2 and transformer power connections T1 and
T3. Transformer connection T2 is a dummy terminal used for
unused primary power lead. The transformer secondary connec-
tions are made at SEC1 and SEC2 connectors.
IV. EASY SELECT CONFIGURATION TAPS
The Easy Select taps are used by installer to configure system. The
ICM2 uses selected taps to modify its operation to a pre-
programmed table of airflows. Airflows are based on system size
or mode of operation and those airflows are modified in response
to other inputs such as the need for de-humidification.
(See Fig. 16.)
The FK4B Fan Coil must be configured to operate properly with
system components with which it is installed. To successfully
configure a basic system (see information printed on circuit board
located next to select pins), move the 5 select wires to pins which
match components used.
A. Auxiliary Heat Range
The installer must select the auxiliary heat airflow approved for
application with kw size heater installed. If no heater is installed,
skip this step. Each select pin is marked with a range of heaters for
which airflow (also marked) is approved. For increased comfort
select the narrowest kw range matching the heater size, for
example, 0-10 for a 10-kw heater. This airflow must be greater
than the minimum CFM for electric heater application with the
size system installed for safe and continuous operation. Note that
airflow marked is the airflow which will be supplied in emergency
heat mode and heating mode on air conditioners when electric heat
is primary heating source. To ensure safe heater operation in heat
pump heating mode when electric heaters are energized, the ICM2
—22—
PRINTED
CIRCUIT
BOARD
W2-E JUMPER
3RD STAGE
W2-W3 JUMPER
2ND STAGE
1
⁄
-IN. MALE
4
FASTON
AMP–TYP
(9) PLCS
A94076
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