Oil Return Quit Condition - Haier AU042FPERA Service Manual

B: In heating mode
The master unit compressor cumulative
• &
operation time
• &
• OR
• &
Note:
if load rate≥75% and the outdoor unit output rate≥75% for 10 min, oil return time reset
5.2 Oil return control
1) Oil return in cooling mode, 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.
2) Oil return in heating mode (4-way valve reversing), the compressor according to the 75% of maximum frequency
control, the outdoor PMV opening angle is 470 pls, the Thermo ON and Thermo OFF indoor PMV opening angle
is 125 pls. When Td > 95 °C ands TdSH > 15 °C, the indoor PMV opening angle increased 10%, max. time is 2;
When Td < 90 °C, return to the usually opening.
3) Oil return in heating mode (4-way valve doesn't reversing), the compressor according to the indoor units load
rate and current running frequency to confirm the oil return enter frequency, the maximum frequency can't exceed
75% of the maximum frequency. the PMV of the outdoor and the Thermo ON indoor unit control automatically,
Thermo OFF indoor PMV opening angle is 250 pls.

5.3 Oil return quit condition:

1) In cooling mode
• OR
2) In heating mode (4-way valve reversing)
• OR
3) In heating mode (4-way valve doesn't reversing)
• OR
• OR
Load rate≤30%
After the outdoor unit startup
Load rate ＞ 30%
Finish the outdoor unit startup control~after 20min
• &
Finish defrosting~ after 30min
After 5min
Td<CT+10°C, for 10s continuously
• OR
• &
Ts-ET<15°C, for 10s continuously
After 1min
After 5min
Td<CT+10°C, for 10s continuously
• OR
• &
Ts-ET<15°C, for 10s continuously
After 2min
After 5min
Td≥105°C, for 5s continuously
When load rate<25%: after 1 hours, 4-way valve
doesn't reversing oil return operation
25%≤load rate<50%: after 2 hours, 4-way valve
doesn't reversing oil return operation
50%≤load rate<75%: after 4 hours, 4-way valve
doesn't reversing oil return operation
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