Defrosting Control; Oil Return Control; Entering Condition; Quit Defrosting - Haier InoSens MRV SI AU032FSEUA Service Manual

16.3 Defrosting control

In order to have the effect heating operation, need defrosting control.

16.3.1 Entering condition:

Ta≤20°C
■ &
■ OR
■ OR
16.3.2 Defrosting control
During defrosting, four-way valve power off, outdoor fan stop, indoor fan stop, outdoor PMV open to 470pls.

3.3 Quit defrosting

■ OR
■ OR
■ OR

16.4 Oil return control

16.4.1 Entering condition:
A: In cooling mode
The master unit compressor cumulative
■ &
operation time
■ &
■ OR
■ &
Note:
load rate=∑indoor HP(Thermo ON) / ∑indoor HP*100%
After heating startup 60min
Last defrosting~ heating cumulative operation time is more than 60 minutes
A: Ta≥6°C, Te≤-10°C For 5min continuously
B: -15≤Ta<6°C, Te≤(5Ta-72)/7 For 5min continuously
C: -23≤Ta<-15°C, Te≤(Ta-69)/4 For 5min continuously
D: Tao<-23°C, Te≤-23°C For 5min continuously
X: During the oil return operation meets the following condition, the
cumulative operation time reset
OR
■ After defrosting operation 10min
■ Outdoor Te≥15°C, for 1min continuously
■ Outdoor Te≥20°C, for 30s continuously
■ Outdoor Te≥30°C, for 5s continuously
■ Tc ≥ 54°C
Load rate≤30%
After the outdoor unit startup
Load rate ＞ 30%
Finish the outdoor startup control~ after 20min
Outdoor Te≥10°C, for 1min continuously
Outdoor Te≥15°C, for 10min continuously
When load rate<20%: after 2 hours
■ OR
When load rate≥20%: after 4 hours
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