Panasonic Urban Multi MX1R Series Service Manual page 354

PACD011001C2
∗ 20 PI control
∗ 21 Discharge temperature protection
∗ 22 Fan control during low temperature protection
∗ 23 Compressor protection
∗ 24 PI control
Troubleshooting Urban Multi "MX1R, ME1R Series" Using R-407C
Controls ON/OFF of the standard compressor and inverter output frequency so that suction
pressure is the optimal value.
If Tc is less than 26.1°C for 30 continuous seconds, fan speed changes as follows: H + ON / H +
OFF / L + OFF. When Tc becomes greater than 52.4°C, fan speed returns to H + ON.
1. Protection control is triggered when secondary inverter current exceeds set current.
2. Protection control is triggered by discharge temperature.
3. Protection control is triggered when the heating load is small and the saturation temperature
corresponding to suction pressure is high.
4. Protection control is triggered when saturation temperature corresponding to suction pressure is
low.
Controls ON/OFF of the standard compressor and inverter output frequency so that discharge
pressure is the optimal value.
Operation Flowcharts
333