Trane 4TXK6512G1000AA Service Manual page 172

6. Only in initial starting of compressor of heating mode, outdoor fan motor and four way valve will powering on
simultaneously.
7. If compressor frequency is higher than regulated frequency before off, it will lower to required frequency and then
stop.
8. Compressor inverter frequency and outdoor fan speed will operate in accordance with other requirement.
Defrosting time sequence is as follows
Inverter compressor
Outdoor fan motor
4-way valve
Unload valve SV1
Anti-cold air function
Indoor fan motor
Beginning
60S
30S
Defrosting FQYH
10s
ON Send signal to indoor uni
O F F
ON
O F F
O N
PMV
ON
O F F
Open angle (E)
Auto open angel
140
END
60S
30S
Soft startup
ON
ON
Auto