40
After 5min
After 1min
Td<CT+10°C, for 10s continuously
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 conrm 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:
• OR
• &
• OR
• OR
• &
• &
• &
The master unit compressor cumulative
operation time
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
Load rate≤30%
After the outdoor unit startup
Finish defrosting~ after 30min
Load rate
＞
30%
Note:
if load rate≥75% and the outdoor unit output rate≥75% for 10 min, oil return time reset
B: In heating mode
50%≤load rate<75%: after 4 hours, 4-way valve
doesn't reversing oil return operation
• &
Finish the outdoor unit startup control~after 20min
1) In cooling mode
• OR
Ts-ET<15°C, for 10s continuously
After 5min
After 2min
Td<CT+10°C, for 10s continuously
• OR
• &
2) In heating mode (4-way valve reversing)
• OR
Ts-ET<15°C, for 10s continuously
After 5min
• OR
3) In heating mode (4-way valve doesn't reversing)
Td≥105°C, for 5s continuously
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