Operation Section
36
5.9 Control Specifications
(1) Fan control
• When the FAN button is pressed, the 52ID (fan motor on/off) relay on the relay board turns on,
operating the fan.
• The 52ID relay turns the auxiliary relay on to operate the fan.
Specifications:
- 52ID (Fan motor On-Off) relay output: 5 A at AC 250 V
(2) Compressor start control
• When the ON/OFF button is pressed, the 52CM relay on the relay board turns on, operating the
compressor.
Specifications:
- 52CM (Compressor On-Off) relay output: 20 A at AC 250 V
(3) Anti-freeze control
• Anti-freeze controls turns the compressor on and off by turning the 52CM relay on in accordance
with the freeze protection thermistor (CTS) temperature. As a result, decreases in cooling
performance due to frost buildup on the evaporator are prevented.
• Compressor off conditions: Freeze protection thermistor (CTS) temperature 28 °F (-2.2 °C)
• Compressor on (recovery) conditions: CTS temperature 60 °F (15.6 °C)
I003026
ON
OFF
52CM
28 °F
(-2.2 °C)
60 °F
(15.6 °C)
CTS temperature
(Evaporator out temperature)
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