Midea ATOM B Series Service Manual page 21

Atom B Series VRF 50/60Hz
5.4 Compressor and Inverter Module Protection Control
This control protects the compressors from abnormally high currents and protects the inverter modules from abnormally
high temperatures.
5.5 Disable Cooling Control
When the outdoor ambient temperature drops below or equal to -15°C， cooling mode is disabled to prevent low
compression ratios which can result in insufficient compressor internal oil lubrication, and prevent humid compressed in low
superheat of compressor bottom conditions. When the outdoor ambient temperature rises above or equal to -14°C, the
compressor enters re-start control.
Outdoor ambient temperature
20
Figure 3‐5.4: Compressor current protection control
Normal operation
Current ≥ Current
max
Compressor current protection, error code P3 is displayed
Figure 3‐5.6: Disable heating control
Cooling operation
o
-15 C
≤
Current < Current
Outdoor ambient temperature ≥ -14
Units stop
max
o
C