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After 5s
After1min
Td<Tc+15°C, for 10s continuously
During Oil return, the compressor according to the 75% of maximum frequency control, the outdoor PMV opening
angle is 470 PLS, the Thermo ON indoor PMV opening angle is 250 PLS, the Thermo OFF indoor PMV opening
angle is 125 PLS. When Td > 95 °C, the indoor PMV opening angle increased 10%, max. time is 2.
When Td < 90 °C, returns to the usually opening.
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15.4 Oil return control
15.4.1 Entering condition:
15.4.2 Oil return control
15.4.3 Oil return quit condition:
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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
Finish the defrosting~ after 30min
Load rate≤30%
Note:
load rate=∑indoor HP(Thermo ON) / ∑indoor HP*100%