Protection Control - Sinclair SCV-EB Series Service Manual

5 Protection control

5.1 High pressure protection control
This control protects the refrigerant system from abnormally high pressure and protects the compressor from transient
spikes in pressure.
Normal operation
P > 4.3MPa
P < 3.2MPa
c c
High pressure protection, error code P1 is displayed
Notes:
1. P : Discharge pressure
c
When the discharge pressure rises above 4.3MPa the system displays P1 protection and the unit stops running. When the
discharge pressure drops below 3.2MPa, the compressor enters re-start control.
5.2 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
P < 0.14MPa
P > 0.30MPa
e
e
Low pressure protection, error code P0 is displayed
Notes:
1. P : Suction pressure
e
When the suction pressure drops below 0.14MPa the system displays P0 protection and the unit stops running. When the
suction pressure rises above 0.3MPa, the compressor enters re-start control.
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.
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