Service Functions - Trane NTXWPH A Series Service Manual

SERVICE FUNCTIONS

10
NTXMMX20A122AA
NTXMMX42A152AA
NTXMPH20A122AA
10-1. PRE-HEAT CONTROL
If moisture gets into the refrigerant cycle, or when refrigerant is liquefied and collected in the compressor, it may interfere
the startup of the compressor.
To improve start-up condition, the compressor is energized even while it is not operating.
This is to generate heat at the winding.
The compressor uses about 50 W when pre-heat control is turned ON.
Pre-heat control is ON at initial setting.
[How to deactivate pre-heat control]
Turn OFF the power supply for the air conditioner before making the setting.
Set the "4" of SW2 on the outdoor control P.C. board to ON to deactivate pre-heat control function.
Outdoor control P.C. board
Turn ON the power supply for the air conditioner.
NOTE: Pre-heat control will be turned OFF when the breaker is turned OFF.
OBHT702
NTXMMX24A132AA
NTXMPH24A132AA
SW871
NTXMMX30A132AA
NTXMPH30A132AA
LED
71
NTXMMX36A142AA