2. Control Board Layout
Display/Change
Rail Setpoint
Rail Temperature,
Alarm Display, and
Service Menu
LED on for
Negative Values
Display/Change Cabinet Setpoint
"UP" Button
"DOWN" Button
Cabinet Temperature,
Alarm Display, and
Service Menu
Energy Saving Mode LED
(Not used this model) "SERVICE USE ONLY" Button
"MANUAL DEFROST" button
K341 Connector 
# 1, 2 Rail Fan Relay (Orange)
K101 Connector
# 1, 3 Transformer 10V
Control Voltage (Dark Blue)
K151 Connector
#1, 2 Condenser Thermistor (Gray) (Clogged Filter Thermistor)
#3, 4 Defrost Thermistor (Orange) (Cabinet) (DTh)
#5, 6 Cabinet Thermistor (Black) (CTh)
#7, 8 Service Jumper (White)
K201 Connector
#1, 2 Rail Switch (Yellow)
#3, 4 Defrost Thermistor
(Orange. Not used, but must be in place)
#5, 6 Rail Thermistor (Black) (RTh)
#7, 8 Rail Switch (Pink)
Front
Rear
Board Part Number
K311 Connector
#1, 2 Comp Control Relay (Brown)
#3, 4 Cabinet Evaporator Fan Relay (Red)
#5, 6 Defrost Heater Relay (Orange)
Chip Revision
Fuse 3A 125V
K361 Connector
#1, 3 Rail Liquid Line Solenoid Valve (RLLV)
#1, 5 Cabinet Liquid Line Solenoid Valve (CLLV)
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