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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
J5 Connector (Low-Voltage DC Side)
Pin Wire Color
Component
Termination
Input/
Output
Pin-to-Pin Voltage Reading
1 Pink
ExpressChill
™ (CustomCool™)
damper
Input/
Output
J5 pin 1 to pin 2 = 12 VDC
(reversing polarity)
2 Yellow
ExpressChill
™ (CustomCool™)
damper
Input/
Output
J5 pin 2 to pin 1 = 12 VDC
(reversing polarity)
3 Brown
ExpressChill
™ (CustomCool™)
damper
Input/
Output
J5 pin 3 to pin 4 = 12 VDC
(reversing polarity), if equipped
with dual damper
4 Yellow/Black
ExpressChill
™ (CustomCool™)
damper
Input/
Output
J5 pin 4 to pin 3 = 12 VDC
(reversing polarity), if equipped
with dual dampers
5 White Thermistor supply voltage (5 VDC) Output J5 pin 5 to J2 pin 3 = 5 VDC
6 White CustomCool
™ thermistor Input N/A
1
5
1
10
1
9
J1
J5
6
J3
J2
1
J4
1
8
Comm. 2-Way Digital
Comm. +12V
Comm. Common
FF Evaporator Thermistor
FF Thermistor
FZ Thermistor
FZ Evaporator Thermistor
+5V
Custom Cool Dual Damper +
Custom Cool Dual Damper -
+5V
Custom Cool Thermistor
Evaporator Fan (RPM)
Fan Common
Evaporator Fan
Condenser Fan
Custom Cool Fan
F
an +12V
3-Way Valve - Gray & White
3-Way Valve - Black
3-Way Valve - Orange
3-Way Valve - Red
3-Way Valve - Yellow
Custom Cool Single Damper -
Custom Cool Single Damper +
Fresh Food Fan
Model Selector
Beverage Center Fan
Quick Freeze Fan
Low Voltage DC
120 VAC
Model Selector
Model Selector
Model Selector
Model Selector
J15
1
Inverter Common
Inverter Output
(Not Used for
AC Compressor)
(Continued next page)
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