Airwell YEVFD Series, Service Manual

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In order to have the effect heating operation, need defrosting control.
During defrosting, four-way valve power off, outdoor fan stop, indoor fan stop, outdoor PMV open to 470pls.
16.3 Defrosting control
16.3.1 Entering condition:
16.3.2 Defrosting control
3.3 Quit defrosting
Ta≤20°C
OR
■ 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
■ OR
■ OR
■ &
After heating startup 60min
C: -23≤Ta<-15°C, Te≤(Ta-69)/4 For 5min continuously
D: Tao<-23°C, Te≤-23°C For 5min continuously
Outdoor Te≥10°C, for 1min continuously
Outdoor Te≥15°C, for 10min continuously
X: During the oil return operation meets the following condition, the
cumulative operation time reset
B: -15≤Ta<6°C, Te≤(5Ta-72)/7 For 5min continuously
A: Ta≥6°C, Te≤-10°C For 5min continuously
Last defrosting~ heating cumulative operation time is more than 60 minutes
■ OR
■ OR
16.4 Oil return control
16.4.1 Entering condition:
■ OR
■ OR
■ &
■ &
■ &
The master unit compressor cumulative
operation time
When load rate<20%: after 2 hours
When load rate≥20%: after 4 hours
Load rate≤30%
After the outdoor unit startup
Finish the outdoor startup control~ after 20min
Load rate
＞
30%
Note:
load rate=∑indoor HP(Thermo ON) / ∑indoor HP*100%
A: In cooling mode
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