DC inverter ARV Individual Series technical manual
84
In heating mode, the temperature of Tdef is higher than 10℃for 1 minute, or the temp. of Tdef is higher
than 15 ℃ for 10 seconds.
Relation between defrosting progress and other progress
Defrosting is prior, except the protections.
Low pressure protection is not activated during defrosting.
Control priority ：1、protections；2、defrosting；3、oil return
3.7.8 Oil return control
During low frequency operation, the outdoor will come to the oil return program every 2-4 hours to
reclaim the oil accumulated in the indoor units. The EXV of the indoor units are open with fixed degree,
and the oil return program lasts for 6 minutes.
3.7.9 Protection function
Compressor restart protection
The compressor can start up until 3 minutes later after the last stop.
Discharge temp. protection
When the discharge temp. is too high, the compressor will reduce the running frequency to control the
discharge temp.
10s late protection happen.3 minutes later can start up;
3-time protection in 60 minutes, should reset the outdoor.
Reduced by 2rps/s
Reduced by 1rps/s
Reduced by 1rps/10s
Constant frequency
Increase by1rps/10s
Normal operation
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