Midea MV6-252WV2GN1 - 6.5 Disable Heating Control

V6 VRF 50/60Hz
44
Midea V6 Series Service Manual
high temperatures. It is performed for each compressor and inverter module.
Figure 3-6.4: Compressor current protection control
Compressor model AA55PHDG –D1YG DC80PHDG –D1YG
Current
max
24.6 33
Figure 3-6.5: Inverter module temperature protection control
Notes:
1. T
f
: Heat sink temperature
6.5 Disable Heating Control
When the outdoor ambient temperature rises above 25°C heating mode is disabled to prevent the mechanical load on
compressors becoming too high and to prevent low compression ratios which can result in insufficient compressor internal
oil lubrication.
Figure 3-6.6: Disable heating control
Current ≥ Current
max
Current < Current
max
Normal operation
Compressor current protection, error code xP3 is displayed
T
f
> 75
o
C T
f
< 73
o
C
Normal operation
Compressor output reduced
T
f
> 80
o
C
T
f
< 65
o
C
Inverter module temperature protection,
error code PL is displayed
When PL protection occurs 3 times
in 100 minutes, the C7 error is
displayed. When a C7 error occurs, a
manual system
restart is required
before the system can resume
operation.
Outdoor ambient temperature > 25
o
C
Outdoor ambient temperature < 23
o
C
Heating operation
Units stop