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1
5
1
10
1
9
J1
J5
6
J3
J2
1
J4
1
8
J13
EARTH
J15
1
Comm. 2-Way Digital
Comm. +12V
Comm. Common
FF Thermistor
Ambient Thermistor
FZ Thermistor
FZ Evaporator Thermistor
+5V
Evaporator Fan (RPM)
Fan Common
Evaporator Fan
Condenser Fan
Fan +12V
Inverter Common
Inverter Output
Articulating Door Mullion Htr
Model Selector
Model Selector
Model Selector
Damper
Damper
Damper
Damper
1
5
J14
Flowmeter
Flowmeter
Humidity Sensor
Humidity Sensor
Model Selector
Model Selector
Low Voltage DC
120 VAC
Main Control Board
J2 Connector (Low-Voltage DC Side)
Pin
Wire Color
Component
Termination
Input/
Output
Pin-to-Pin Voltage Reading
1
Blue
Evaporator fan
tachometer
Input
Not applicable to this model.
2
Blue/White
Model
Input
J2 pin 2 to pin 3 = 12 VDC
3
White/Silver
Fan Common
Common
J2 pin 3 to pin 8 = 12 VDC
4
Yellow/Black
Evaporator fan
Output
J2 pin 4 to pin 3 = 12.3 VDC (high), 11.5 VDC
(med), 8.2 (low)
Note:
(See
Evaporator Fan
.)
5
Yellow
Condenser fan
Output
J2 pin 5 to pin 3 = 12 VDC (super high), 10.5
VDC (high), 7.5 VDC (med), 5.5 VDC (low)
6
Black/White
Articulating Door
Mullion Heater
Output
J2 pin 6 to pin 8 =
0 to 13.6 VDC (Voltage
varies with room relative humidity, ambient
temperature, and FF/FZ control settings.)
8
Red
Fan supply voltage
(12 VDC)
Output
J2 pin 8 to pin 3 = 12 VDC
Main Control Board
J3 Connector (Low-Voltage DC Side)
Pin
Wire Color
Component
Termination
Input/
Output
Pin-to-Pin Voltage Reading
1
Yellow
Damper
Output
J2 pin 3 to J3 pin 1 = 6 VDC
2
Red/Black
Damper
Output
J2 pin 3 to J3 pin 2 = 6 VDC
3
White/Brown
Damper
Output
J2 pin 3 to J3 pin 3 = 6 VDC
4
Blue/Yellow
Damper
Output
J2 pin 3 to J3 pin 4 = 6 VDC
(
Continued next page
)
Main Control Board
J1 Connector (Low-Voltage DC Side)
Pin
Wire Color
Component
Termination
Input/
Output
Pin-to-Pin Voltage Reading
1
Red/Blue
Fresh food thermistor
Input
N/A
2
Yellow
Ambient thermistor
Input
N/A
3
Red/White
Freezer thermistor
Input
N/A
4
Blue/White
Freezer evaporator thermistor
Input
N/A
5
Blue
Thermistor supply voltage (5 VDC)
Output
J1 pin 5 to J2 pin 3 = 5 VDC