Operation Section
34
(2) Input signal
• The relay board receives inputs from the control panel, sensors, and external devices to perform
device control.
Control Panel Input
Sensor Input
External Input Signal Specification
Symbol Indication Function Connector
SW1 ON/OFF Button On/off control for unit operation. Turns the unit on and off.
CN17
SW2 FAN Button
Changes the fan control mode between continuous and automatic
on/off control.
SW3
SET TEMP
Button
Increases the set temperature.
SW4
SET TEMP
Button
Decreases the set temperature.
Symbol Type
Specification
Connector
Characteristic “Short” Detection “Open” Detection
RTS Room Thermistor
5 k ohm at 77 °F
(25 °C)
181 °F (83 °C) or
more
-29 °F (-34 °C) or
less
CN11
CTS
Freeze Protection
Thermistor
5 k ohm at 77 °F
(25 °C)
181 °F (83 °C) or
more
-29 °F (-34 °C) or
less
CN12
Symbol Signal Specification Function Connector
E+, E- Fire Alarm Input
On: Between 10 to 20
mA at DC12 V
(Off: No signal)
On: Activates “Defect control”
(Contact: Normally open)
LED shows “AL”, Output signal “ON”
On board buzzer sound
CN15
OCF1,
OCF2
Thermal Relay
Protection
On: Between 10 to 20
mA at DC12 V
(Off: No signal)
Off: Activates “Defect control”
(Contact: Normally closed)
LED shows “FL”, Output signal “ON”
CN16
HPRS
High Pressure
Switch
On: Between 0.5 to 1.0
mA at DC5 V
(Off: No signal)
Off:
1) < 120 sec.: Compressor stops.
2) 120 sec.<: Compressor stops.
LED shows “HP” output signal “ON”
CN13
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