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CONTROL
4.7 Protection control
4.7.1 High pressure protection control
This control protects the refrigerant circuit from abnormally high pressure and protects the compressor from transient
spikes in pressure.
Normal operation (sizes 2.1 to 8.1)
Pc > 4,3 MPa
↓ ↑
Pc < 3,6 MPa
High pressure protector, error code P1 is displayed
Normal operation (sizes 9.1 to 14.1)
Pc > 4,2 MPa
↓ ↑
Pc < 3,2 MPa
High pressure protector, error code P1 is displayed
Pc: discharge pressure
When the discharge pressure rises above 4.3 MPa the system displays P1 protection and the unit shuts down. When
the discharge pressure drops below 3.6 MPa, the compressor enters re-start control.
4.7.2 Low pressure protection control
This control protects the refrigerant system from abnormally low pressure and protects the compressor from transient
drops in pressure.
Normal operation
Pe < 0,14 MPa
↓ ↑
Pe > 0,30 MPa
Low pressure protection, error code P0 is displayed
Pe: suction pressure
When P0 protection occurs 3 times in 60 minutes, the HP error is displayed.
When an HP error occurs, a manual system restart is required before the system can resume operation.
When the suction pressure drops below 0.14 MPa, the system displays P0 protection and the unit shuts down.
When the suction pressure rises above 0.3 MPa, the compressor enters re-start control.
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