Trane 4TXM2318BF300AA Service Manual page 121

defrosting signal of indoor unit will remain until the outdoor enters defrosting mode.
Note: When outdoor compressor not running, the unti still can enter manual defrosting, but it will comply with the
3-minute protection of compressor.
6.6.4 Defrosting operation flow chart:
Multi:
Fixed frequency
Compressor
Outdoor motor
4-way valve
All EEVs
All indoor motors ON
Beginning
Indicated FQY 60s
0HZ
5s
ON
OFF
ON
OFF
450-pulse
Auto open angle
OFF
end
Defrosting FQY 80 Hz （ E）
Send defrosting signal to indoor
350-pulse(E)
119
60s Soft startup
0HZ
Auto
15s
450-pulse
Auto open angle
Anti- cold air fun ction