Troubleshooting Guide

Air Conditioner Service Manual
18
a. After defrosting 60s, and OAT≥12℃(53.6℉); or
b. OAT＜－5℃(-41℉), and OPT ≥8℃(46.4℉) for 80s continuously; or
c. The defrosting for 10 min.
When AC meet any of condition a, b or c, defrosting finish.
COMPRESSOR
ON
OUTDOOR FAN
4-way VALVE
OFF
50S
50S
43S
48S
Defrosting max time
43s
3) Defrosting end off: Compressor stops working, and re-starts to working after 50s delay;
4.2.4.7. Cold air prevention:
This function intends to prevent cold air from being discharged when the heating operation starts up
1). IDU fan motor cold air prevention
① .When RT＜24℃(75.2℉):
a. If ITP＞31℃(87.8℉) while compressor works for 5 min, fan motor will work according to preset fan speed.
b. If IPT≤31℃(87.8℉), fan motor stops working while compressor operation within 2min, if IPT≥27℃(89.6
℉), fan motor works in low speed 2 min, then change to preset speed.
② When RT≥24℃(75.2℉):
a. Within 2 min after compressor start up working, once IPT＞27℃(89.6℉), fan motor will change to preset
speed.
b. After compressor starts working 2 min, fan motor change to preset speed directly.
2). Vane blade operation for cold air prevention.
a. If the vane works on status of non-swing: While IPT increase to a special degree, the vane blade will change
the position to:
① Default angle; or
② Previous position; or
③ Customer preset.
The above operation can work one time only, when compressor stops working, the unit will once again
inspect the function.
b. If the vane works on swing: When IDU quits from cold air prevention, vane operate as preset.
4.2.4.8. “8℃(46.4℉)” Heating
When function effective, it will make sure the room temperature not lower than 8℃(46.4℉), unit works on heating
mode.