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 Communication kit To connect to MTR-480/MTR-L03(option).
CN3
Remote alarm terminal
#1: COM.
#2: N.O.
#3: N.C.
Remote alarm contact outputs.
In normal condition, open between #1 and #2
and closed between #1 and #3.
CN4
#1-#2㸸Temp. control relay
#3-#4㸸Heater relay
To control chamber temperature (12VDC)
To supply the power to Cap. tube heater
(12VDC)
CN5
#1-#5: Switch PCB
#6-#7: Buzzer
To connect to each switch
To connect to buzzer
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 door open and close
To detect ambient temperature
To detect temperature in condenser outlet pipe.
To detect temperature in cascade.
CN8
#1-#2: Battery㸦#1:6V #2:Battery switch㸧
#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 chamber temperature.
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