12
Connections on PCB
The following shows the connections of connectors on the Temp. controller PCB.
Connector Connects to Usage
CN1 Switching power supply To supply the power to PCB.
CN2 Network interface To connect to MTR-480（option）
CN3
Remote alarm terminal
#1: COM.
#2: N.O.
#3: N.C.
Remote alarm contact outputs.
In normal condition, open for #1-#2 and
closed for #1-#3.
CN4
#1-#2：Temp. control relay
#3-#4：Heater relay
To control internal temperature (12VDC)
To supply the power to Cap. tube heater
(12VDC)
CN5
#1-#5: Switch PCB
#6-#7: Buzzer
To connect to each switch
CN6 Display PCB To connect to each LED
CN7
#1-#2: Door switch
#5-#6: AT sensor
#7-#8: Filter sensor
#9-#10: Cascade sensor
To control the door switch
To detect the ambient temperature
To detect the temperature in condenser outlet pipe.
To detect the temperature in cascade.
CN8
#1-#2: Battery
（#1:6V #2:Battery switch）
#3-#4: Transformer
To supply the power during power failure
To supply the power to PCB.
CN9 #1-#2: H. Comp. relay To control compressor H ON/OFF (12VDC)
CN10 Unused
CN11 #1-#3: Temp. sensor To detect the internal temperature.
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