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Main Control Board
J15 Connector (Low-Voltage DC Side)
Pin
Wire Color
Component
Termination
Input/
Output
Pin-to-Pin Voltage Reading
1
Red
Compressor inverter
Output
J 15 pin 1 to J15 pin 2 = 4 to 6 VDC
2
White
Compressor inverter
Output
J 15 pin 2 to J15 pin 1 = 4 to 6 VDC
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
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Main Control Board
J4 Connector (Low-Voltage DC Side)
Pin
Wire Color
Component
Termination
Input/
Output
Pin-to-Pin Voltage Reading
1
Black
Temperature control
Communication 2-way digital communication
2
Red
Temperature control
Output
J4 pin 2 to pin 3 = 12 VDC
3
Blue
Temperature control
Common
J4 pin 2 to pin 3 = 12 VDC
Main Control Board
J14 Connector (Low-Voltage DC Side)
Pin
Wire Color
Component
Termination
Input/
Output
Pin-to-Pin Voltage Reading
2
White
Flowmeter
Output
J 14 pin 2 to J 4 pin 2 = 6.5 to 7 VDC when
fi
rst activated
4
Black
Flowmeter
Output
J 14 pin 4 to J 4 pin 2 = 13.6 VDC
Main Control Board
J5 Connector (Low-Voltage DC Side)
Pin
Wire Color
Component
Termination
Input/
Output
Pin-to-Pin Voltage Reading
5
Blue
Humidity Sensor
Output
J5 pin 5 to J4 pin 3 = 5 VDC
6
Yellow
Humidity Sensor
Input
J5 pin 6 to J4 pin 3 = 1 to 3.6 VDC