V6R VRF 50Hz
38
Midea V
6
R
Series S
er
vice M
anual
Figure 3-6.4: Low pressure protection control in heating operation
Notes:
1.
P
e
: Suction pressure
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.
Figure 3-6.5: Discharge temperature protection control
Notes:
1.
T7C1: Compressor discharge temperature
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.
Figure 3-6.6: Over-current protection control
Table 3-6.1: Current limitation for compressor inverter modules
Model
8HP
10HP
12HP
14HP
16HP
18HP
Current
A
104
116
128
142
150
158
Current
D
76
88
100
122
130
138
Notes:
1.
The current limitation value is the actual current * 4
P
e
< 0.07MPa
P
e
≥
0.18MPa
Normal operation
Low pressure protection, error code P2 is displayed
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
≥
115°C
T7C1 < 90°C
Normal operation
Discharge temperature protection, error code P4 is displayed
Current
≥
Current
A
Current < Current
D
Normal operation
Over current protection, error code P3 is displayed
