Functions Si-95
20 Functions Inverter K Series
1.7 Oil Return Operation
In order to collect refrigeration oil held up in connecting piping, the compressor’s operating time is counted,
and oil return operation is carried out for 8 minutes 30 seconds every 8 hours (2 hour after turning on the
power supply, and every 8 hours after that).
(When heating, the indoor unit’s electric heater is tuned off one minute prior to oil return operation in
preparation for oil return.)
Operation Contents
Step 1 → Discharge oil return k = kg/cm
2
Compressor 86Hz + OFF
EEV 2000pls
Outdoor Unit Fan H + ON
Outdoor Unit Heat Exchanger Condenser
4 Way Valve OFF
Injection 1 Td Protection Control
Injection 2 OFF
Hot Gas ON at Lp < 0.3k
4 Minutes Elapsed
Step 2 → Suction oil return
Compressor 86Hz + OFF
EEV 2000pls
Outdoor Unit Fan H + ON
Outdoor Unit Heat Exchanger Condenser
4 Way Valve OFF
Injection 1 Td Protection Control
Injection 2 Td Protection Control
Hot Gas ON at Lp < 0.3k
4 Minutes Elapsed
∗ Td : Discharge Pipe Temperature
Step 3 → BS solenoid valve changeover
Compressor 38Hz + OFF
EEV 2000pls
Outdoor Unit Fan H + ON
Outdoor Unit Heat Exchanger Condenser
4 Way Valve OFF
Injection 1 Td Protection Control
Injection 2 OFF
Hot Gas ON at Lp < 0.3k
30 Seconds Elapsed
Step 4 → Refrigerant is discharged from accumulator
Compressor 76Hz + OFF
EEV Limit of Opening
Outdoor Unit Fan H + ON
Outdoor Unit Heat Exchanger Evaporater
4 Way Valve ON
Injection 1 Td Protection Control
Injection 2 OFF
Hot Gas Low Pressure Protection Control
5 Minutes Elapsed
Hp > 14k
R5T > Te + 10ºC
* Te : Low Pressure Equivalent
Saturated Temperature
Normal Control
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