Trane 4TVH0086FE000AA Service Manual page 50

6.4 Compressor and Inverter Module Protection Control
This control protects the compressors from abnormally high currents and protects the inverter modules from abnormally
high temperatures. It is performed for each compressor and inverter module.
Figure 3-6.5: Inverter module temperature protection control
T > 75
o
f
Compressor output reduced
T > 80
o
f
Inverter module temperature protection,
Notes:
1. T : Heat sink temperature
f
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
Outdoor ambient temperature > 25
Figure 3-6.4: Compressor current protection control
Current ≥ Current
Compressor current protection, error code xP3 is displayed
Compressor model
Current
max
Normal operation
C T < 73 C
o
f
C
error code PL is displayed
Normal operation
Current < Current
max
AA55PHDG –D1YG DC80PHDG –D1YG
24.6
T < 65 o C
f
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.
Heating operation
o C Outdoor ambient temperature < 23
Units stop
49
max
33
o C