Panasonic Urban Multi MX1R Series Service Manual page 165

Operation Flowcharts
∗ 18 Start control
∗ 19 Compressor protection
144
Heating operation
∗18
Start control in progress?
operation in progress?
Oil equalization in progress?
∗23
protection operation
Inverter compressor magnetic
contactor
K1M
Inverter output frequency 30~116 Hz by PI
control ∗24
INV
ON/OFF by PI
Standard compressor
control
magnetic contactor
K2M
Electronic expansion valve
Y1E
Solenoid valve (hot gas)
Y2S
Solenoid valve (injection)
Y3S
∗21
Y4S
4-way valve
Y1R
Fan M1F
Fan M2F
60 second start control in order to prevent liquid back to the compressor.
1. Protection control is triggered when the cooling load is large and the saturation temperature
corresponding to suction pressure is high.
2. Protection control is triggered when secondary inverter current exceeds set current.
3. Protection control is triggered by discharge temperature.
4. Protection control is triggered when saturation temperature corresponding to suction pressure is
low.
YES
NO
YES
Defrosting
NO
YES
NO
Compressor
YES
in progress?
NO
30~116 Hz by PI and
protective control
ON/OFF by PI and
protective control
Flow rate control
ON/OFF by saturation
temperature
OFF
corresponding to
suction pressure
ON/OFF by discharge temperature protection control
ON
H
ON
Troubleshooting Urban Multi "MX1, ME1 Series" Using R-22
PACD011001C2
ON
38 Hz 86 Hz
ON ON
Open
Flow rate control
OFF
ON
OFF
OFF
OFF
B
42 Hz
OFF
ON
H
ON
(VF028)