Protection Control - Sinclair SCV-750EB Service Manual

6 Protection Control

6.1 High Pressure Protection Control
This control protects the refrigerant system from abnormally high pressure and protects the compressor from transient spikes in
pressure.
P > 4.2MPa
c
High pressure protection, error code P0 is displayed
Notes:
P : Discharge pressure
1.
c
When the discharge pressure rises above 4.2MPa the system displays P0 protection and all units stop running. When the
discharge pressure drops below 3.2MPa, the compressor enters re-start control.
6.2 Low Pressure Protection Control
This control protects the refrigerant system from abnormally low pressure and protects the compressor from transient drops in
pressure.
P
e
Low pressure protection, error code P1 is displayed
Notes:
P : Suction pressure
1.
e
6.3 Discharge Temperature Protection Control
This control protects the compressor from abnormally high temperatures and transient spikes in temperature.
Discharge temperature > 115°C
High discharge temperature protection, error code P0 is displayed
When the discharge temperature rises above 115°C the system displays P0 protection and all the units stop running. When the
discharge temperature drops below 90°C, the compressor enters re-start control.
Normal operation
P < 3.2MPa
c
Normal operation
< 0.05MPa
P
Normal operation
Discharge temperature < 90°C
When P0 protection occurs 3 times in
60 minutes, a manual system restart is
required before the system can
resume operation.
> 0.15MPa
e
When P1 protection occurs 3 times in
60 minutes, a manual system restart is
required before the system can
resume operation.
When P0 protection occurs 3 times in
60 minutes, a manual system restart is
required before the system can
resume operation.
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