20
Connections on PCB
* Following are explanation of connections on the Main PCB.
Connector
Connects to Usage Voltage
CN1 Switching power supply To supply the power to PCB.
#1: 12V
CN2 LCD module To connect with LCD.
CN3 Control Board (CN5)
To connect with LCD contrast adjusting
knob.
CN4
#1-#2: Battery switch
#3-#4: Transformer(100V, 9V)
To supply the power to Main PCB
during power failure.
To detect abnormal low voltage.
#1-#2: 24V
CN5 Main PCB (CN3)
CN6 Main PCB (CN18)
CN7 MTR-480 (Option) To connect with interface.
#1: 5V
CN8 #1-#2: Buzzer PCB To connect with buzzer.
CN9
#1-#2: Temp. control relay H
#3-#4: Temp. control relay L
#5-#6: Heater relay
To control compressor H.
To control internal temperature.
To supply the power to cap. tube heater.
CN10 #3-#4: Door switch To control digital lock (Option).
#1: 12V
#2: 5V
CN11
Remote alarm terminal
Remote switch
To output remote alarm
#1: COM
#2: N.C.
#3: N.O.
CN12
#1-#2: AT sensor
#3-#4: Filter sensor
#5-#6: Cascade sensor
#9-#10: Door switch
To detect ambient temperature.
To detect temperature at condenser
outlet pipe.
To detect temperature at cascade.
To control door switch.
CN13 Unused
CN14 LCD module
To supply the power to back lamp for
LCD.
CN15 Main PCB (CN8)
CN16 Unused
CN17
#1-#2: Switching power supply
#3-#4: Lock
To supply the power to digital lock.
#1: 24V
#3: 24V
CN18 Control board (CN6) To connect with each keys.
CN19 #3-#4: Back up PCB To connect with back-up system.
CN20 #1-#3: Temp. sensor To detect internal temperature.
CN21 #3-#4: Analog terminal To output analog.
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