Thermostat; Wiring Harness; 12-Pin Plug (Pl-1) On Easy Select Board; Control Signals (Easy Select Board & 16-Pin Plug) - Carrier FV4B Installation Instructions Manual

J1 JUMPER – PULL FOR
DEHUMIDIFICATION CONTROL
J2 JUMPER – PULL FOR
VIO
BLU
ORN
BLK
WHT
YEL
PIN 12
4. Verify that approximately 230vac is present at motor.
5. Verify low-voltage control signals to motor. The motor receives its control signals through the 12-pin plug (PL-1) on Easy Select Board
and 16-pin plug on wiring harness. (See Troubleshooting Example.) The combinations of pins energized will determine motor speed. (See
Fig. 20.) See Table 7 for circuit board, low-voltage screw terminals energized and for voltage present at each pin on 12-pin plug (PL-1).
See Table 7 for pin number on 16-pin plug which should have voltage when Easy Select Board screw terminals have 24vac.
C. Use following procedure to check control signals:

THERMOSTAT

1. Remove all thermostat wires from Easy Select Board.
2. Jumper screw terminals (1 at a time): R-G, R-Y/Y2, R-Y1, R-W1. If motor runs in all cases, thermostat is miswired, configured incorrectly
or defective. If motor runs in some cases, but not others, continue to check wiring harness and circuit board.

WIRING HARNESS

1. Shut off power to unit; wait 5 min.
2. Remove 5-pin plug from motor.
3. Remove 16-pin from motor.
4. Replace 5-pin plug and turn power on.
5. Check for appropriate voltages on 16-pin connector with screw terminals jumpered. (See Table 7 for values and see examples below.)
If signals check correctly and motor does not run, inspect wiring harness for loose pins or damaged plastic that could cause poor connections. If
connections are good, either control module or motor is defective. If proper signals are not present, check circuit board using procedure below:

12-PIN PLUG (PL-1) ON EASY SELECT BOARD

1. Unplug harness from board.
2. Check for appropriate voltages on pins with Easy Select Board screw terminals jumpered. (See Table 7 for values and see example below.)
If proper signals are not present, replace Easy Select Board. If present at board and not at 16-pin connector, wiring harness is defective.

TROUBLESHOOTING EXAMPLE:

Motor is not running on a call for heat-pump heating. System is a single-speed heat pump.
1. After performing checks in Thermostat section, follow steps 1 thru 5 in Wiring Harness section. Then proceed with example.
2. With all thermostat wires removed from Easy Select Board, place a jumper wire between R and Y/Y2 low-voltage screw terminals on the
Easy Select board.
3. Check Table 7 for pin number on 16-pin connector associated with the Y/Y2 signal. The correct pin is #14. The far right column shows
that (-) 12vdc should be present between pin #14 and pin #1 (common) on the 16-pin connector.
HEAT STAGING
SEC1 SEC2
J1
TM
EASY SELECT
AUX HEAT KW/CFM
0-30 0-20 0-10 0-5
J2
1075 875 725 625
AC/HP SIZE
036 030 024 018
SYSTEM TYPE
AC HP-COMFORT HP-EFF
AC/HP CFM ADJUST
NOM LO HI
ON/OFF DELAY
0 30
0
ENH
90 90
0
CONTINUOUS FAN
AUX1
LO MED HI YEL
AUX2
CEBD430226-01B CESS430226-01B
24VAC
GRY
HEATER/MOTOR
12-PIN CONNECTOR
(PL–1) PIN 1
→ Fig. 21—Control Signals (Easy Select Board & 16-Pin Plug)
LOW VOLTAGE SCREW TERMINALS
DEHUMIDIFICATION INPUT
D
H
24 VAC HOT
R
AUXILARY HEAT STAGE 1
W
1
W AUXILIARY HEAT STAGE 2
2
LOW SPEED COMPRESSOR
Y
1
SINGLE OR HI SPEED
Y/Y
2
COMPRESSOR
G
FAN
O
REVERSING VALVE
C
COMMON
HUM1
G Y/Y2 W
HUM2
16 15 14
8 7
6
Y
1
—18—
W 24V D
H
2 2
13 12 11 10 9
5 4 C 2 1
C W C
16-PIN PLUG
1
A03004