Easy Select Configuration Taps - Carrier FA4ANF Service Manual

MOLEX 7-PIN
CONNECTOR (1)
HEAT PUMP HEATING MODE—TWO-SPEED LOW
Thermostat closes R to Y1. The Y1 signal is sent directly to ICM2.
HEAT PUMP HEATING WITH AUXILIARY ELECTRIC
HEAT
Thermostat closes circuits R to Y/Y2 and/or R to Y1 with R to W2,
W3, or E (and R to O in the case of defrost).
See previously described modes for circuit paths.
In the event that electric heating is called for by thermostat while
heat pump is also operating in either heating or defrost mode,
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.
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.
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.
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
LO
BLK
AC/HP TIME
ON 0 30
OFF 90 90
GRY
RED
GROUND
SCREW
SEC2
REQUIRED
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
MAX ST1
RANGE
0-10 0-5 L
800 600
R
SIZE
030 024
C
FS1
D10
O
HP-EFF
Y/Y2
R1
CFM ADJUST
MED HI
Y1
DELAY
G
0
ENH
0
JW2
D11
E
W2
R3
MOTOR
W3
JW1
24VDC
JW3
P2
HUM1
AUX1
SEC1 JW4
D3
AUX2 HUM2
24VAC
R2
HEATER
D2 D9 D4
P1
D8 D7 D5 D6
D1
CES0130007–00
AMP 12-PIN MATE-N-LOCK
CONNECTOR (1)
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.
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-
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.
Step 4—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.
22
PRINTED
CIRCUIT
BOARD
W2-E JUMPER
3RD STAGE
W2-W3 JUMPER
2ND STAGE
1
⁄ -IN. MALE
4
FASTON
AMP–TYP
(9) PLCS
A94076