M thermal Mono
202008 17
5.3 Discharge Temperature Protection Control
This control protects the compressor from abnormally high temperatures and transient spikes in temperature.
Figure 3-5.3: High discharge temperature protection control
When the discharge temperature rises above 115°C the system displays P4 protection and the unit stops running. When
the discharge temperature drops below 90°C, the compressor enters re-start control.
Figure 3-5.4:Low discharge temperature protection control
When the discharge temperature is lower than suction temperature for more than 5 minutes, the system displays EA
protection and the unit stops running. When the discharge temperature is higher than suction temperature, the
compressor enters re-start control.
5.4 Compressor Current Protection Control
This control protects the compressor from abnormally high currents.
Figure 3-5.5: Compressor current protection control
When the compressor current rises above Current
max
the system displays P3 protection and the unit stops running. When
the compressor current drops below Current
max
, the compressor enters re-start control.
Discharge temperature > 115°C
Discharge temperature < 90°C
Normal operation
High discharge temperature protection, error code P4 is displayed
Tp Th for more than 5 minutes
Normal operation
Low discharge temperature protection, error code EA is displayed
Current > 28A Current < 28A
Normal operation
Compressor current protection, error code P3 is displayed
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