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.
→ Fig. 21—Control Signals (Easy Select Board & 16-Pin Plug)
A03004
EASY SELECT
D
H
R
W
1
W
2
Y
1
Y/ Y
2
G
O
C
HEATER/MOTOR
CEBD430226-01B CESS430226-01B
AUX HEAT KW/CFM
0-30
1075
SEC1 SEC2
J1
J2
AC/HP SIZE
036 030 024 018
AC
HP-COMFORT
HP-EFF
NOM HI
ENH
LO
SYSTEM TYPE
AC/HP CFM ADJUST
ON/OFF DELAY
CONTINUOUS FAN
MED HI YELLO
AUX1 HUM1
AUX2
24VAC
GRY
HUM2
YEL
WHT
BLK
ORN
BLU
VIO
0-20
875
0-10
725
0
90
30
90
0
0
0-5
625
TM
J2 JUMPER – PULL FOR
HEAT STAGING
12-PIN CONNECTOR
(PL–1)
PIN 1
PIN 12
16 15
14 13
12 11 10 9
87
6
54C21
16-PIN PLUG
DEHUMIDIFICATION INPUT
24 VAC HOT
AUXILARY HEAT STAGE 1
AUXILIARY HEAT STAGE 2
LOW SPEED COMPRESSOR
SINGLE OR HI SPEED
COMPRESSOR
FAN
REVERSING VALVE
COMMON
J1 JUMPER – PULL FOR
DEHUMIDIFICATION CONTROL
LOW VOLTAGE SCREW TERMINALS
G
Y/Y2
W
2
W
2
24V D
H
Y
1
C W
1
C
—18—
To Next Page
Loading...
