Panasonic Urban Multi MX1R Series Service Manual page 268

PACD011001C2
1.7.2 ME1R Series
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
Upper Limit Frequency
Limited to 38Hz + ON
Function Urban Multi "MX1R, ME1R Series" Using R-407C
Step 1 → Discharge oil return
Compressor
1 Minute
EEV
Preparation Elapses
for Oil Return
Outdoor Unit Fan
Outdoor Unit Heat Exchanger
4 Way Valve
(VF014)
Injection 1
Injection 2
Hot Gas
Step 2 → Suction oil return
Compressor
EEV
Outdoor Unit Fan
Outdoor Unit Heat Exchanger
4 Way Valve
Injection 1
Injection 2
Hot Gas
Step 3 → HR solenoid valve changeover
Compressor
EEV
Outdoor Unit Fan
Outdoor Unit Heat Exchanger
4 Way Valve
Injection 1
Injection 2
Hot Gas
Step 4 → Refrigerant is discharged from accumulator
Compressor
EEV
Outdoor Unit Fan
Outdoor Unit Heat Exchanger
4 Way Valve
Injection 1
Injection 2
Hot Gas
86Hz + OFF
2000pls
H + ON
Condenser
Td Protection Control
ON at Lp < 0.3k
4 Minutes Elapsed
86Hz + OFF
2000pls
H + ON
Condenser
Td Protection Control
Td Protection Control
ON at Lp < 0.3k
4 Minutes Elapsed
∗ Td : Discharge Pipe Temperature
38Hz + OFF
2000pls
H + ON
Condenser
Td Protection Control
ON at Lp < 0.3k
30 Seconds Elapsed
76Hz + OFF
Limit of Opening
H + ON
Evaporater
Td Protection Control
Low Pressure Protection Control
5 Minutes Elapsed
Hp > 15.2k
R5T > Te + 10ºC
* Te : Low Pressure Equivalent
Saturated Temperature
Normal Control
Function
k = kg/cm²
OFF
OFF
OFF
OFF
OFF
ON
OFF
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