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Connections on PCB
The following shows connections of connector on Main PCB.
Connector Connects to Usage
CN1
Switching power supply
#1: DC12V
#3: GND
To supply the power to PCB.
CN2 MTR-480/MTR-L03 (Option) To connect with MTR-480/MTR-L03.
CN3
Remote alarm terminal
#1: COM
#2: N.O.
#3: N.C.
Remote alarm contact outputs.
CN4
#1 - #2: Temp. control relay A
#3 - #4: Fan motor relay A
#5 - #6: Heater relay A
To control chamber temperature
To control condensing fan motor A
To control cap. Tube heater A
CN7
#1 - #2: AT sensor
#3 - #4: A comp. sensor
#5 - #6: B comp. sensor
To detect ambient temperature
To detect temperature of compressor A
To detect temperature of compressor B
CN8
#1 - #2: Battery (DC6V), battery switch
#3 - #4: Transformer
To supply the power during power failure.
CN9
#1 - #2: Temp. control relay B
#3 - #4: Fan motor relay B
#5 - #6: Heater relay B
To control chamber temperature
To control condensing fan motor B
To control cap. Tube heater B
CN11
Temp. sensor
#1: PT sensor
#3: GND
To detect chamber temperature
CN84 #6 - #9: LCD PCB (CN102) To connect with LCD PCB
CN86 #1 - #2: Door switch To detect door open and shut
CN87
#1 - #2: Fan motor relay B
#4 - #5: Fan motor relay A
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