Protection Control; High Pressure Protection Control; Low Pressure Protection Control; Low Pressure Protection Control In Cooling Operation - Midea VRF Series Service Manual

6 Protection Control

6.1 High Pressure Protection Control

This control protects the system from abnormally high pressure and protects the compressors from transient spikes in
pressure.

6.2 Low Pressure Protection Control

This control protects the system from abnormally low pressure and protects the compressors from transient drops in
pressure.
Figure 3-6.3: Low pressure protection control in cooling operation
P < 0.07MPa
e
Low pressure protection, error code P2 is displayed
Notes:
P : Suction pressure
1.
e
Figure 3-6.1: High pressure protection control in cooling operation
Normal operation
P 3.9MPa
≥
c
High pressure protection, error code P1 is displayed
Notes:
1. P : Discharge pressure
c
Figure 3-6.2: High pressure protection control in heating operation
Normal operation
P 3.9MPa
≥
c
High pressure protection, error code P1 is displayed
Notes:
1. P : Discharge pressure
c
Normal operation
P 0.23MPa
≥
e
P < 3.5MPa
c
P < 3.1MPa
c
When P2 protection occurs 3 times in
60 minutes, the H5 error is displayed.
When an H5 error occurs, a manual
system restart is required before the
system can resume operation.
V6R VRF 50/60Hz
37