Discharge Temperature Protection Control; Low Pressure Protection Control In Heating Operation; Over-Current Protection Control; Current Limitation For Compressor Inverter Modules - Midea VRF Series Service Manual

V6R VRF 50/60Hz
Figure 3-6.4: Low pressure protection control in heating operation
P < 0.07MPa
e
Low pressure protection, error code P2 is displayed
Notes:
P : Suction pressure
1.
e

6.3 Discharge Temperature Protection Control

This control protects the compressors from abnormally high temperatures and transient spikes in temperature. It is
performed for each compressor.
When the discharge temperature rises above 115°C the system displays P4 protection and all units stop running. When P4
protection occurs 3 times in 100 minutes, the H6 error is displayed. When an H6 error occurs, a manual system restart is
required before the system can resume operation.

6.4 Over-current Protection Control

Over current protection control is performed to prevent tripping due to transient inverter over-current. It protects the
compressors from abnormally high currents. It is performed for each compressor.
Table 3-6.1: Current limitation for compressor inverter modules
Model
Current
Current
Notes:
1. The current limitation value is the actual current * 4
38
Normal operation
P 0.18MPa
≥
e
Figure 3-6.5: Discharge temperature protection control
Normal operation
T7C1 115°C
≥
Discharge temperature protection, error code P4 is displayed
Notes:
1. T7C1: Compressor discharge temperature
Figure 3-6.6: Over-current protection control
Current Current
≥
Over current protection, error code P3 is displayed
8HP 10HP
104 116
A
76 88
D
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.
T7C1 < 90°C
Normal operation
Current < Current
A
12HP 14HP 16HP
128 142 150
100 122 130
D
18HP 20HP
158 158
138 138