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3.12 Module radiator temperature protection control
When the radiator temperature Tfin ≥ the limit temperature value, according to Tfin=limit temperature value to
control the frequency limit of the INV compressor.
3.13 Compression ratio protection control
(1) When the compression ratio ε ≥ limit value, the compressor speed limit control is performed according to the
target of ε=limit value;
(2) When the compression ratio ε<limit value, the compressor speed limit control is performed according to the
target of ε=limit value;
(3) When ε exceeds the limit value for a certain period of time, alarm the compression ratio error and shutdown.
3.14 Balancing oil operation
(1) When more than 2 outdoor units are in operation, the master / slave unit will balancing oil every 20 minutes;
(2) Balancing oil between the outdoor units, according to the pressure difference between the pressure of the high
pressure chamber compressor oil pool of the oil discharging oudoor unit and the pressure of the suction side of the
oil absorbing outdoor unit. during the balancing oil, the outdoor unit that discharges oil turns on the SV9, and the
outdoor unit that absorbs oil opens the SV10.
3.15 Frequency converter cooling fan control
(1) The heat generate by the frequency converter forced cooling with a cooling fan;
(2) After the compressor is started, the fan runs immediately. After the compressor stops, the fan stops running.
3.16 Automatic back-up operation
(1) When a outdoor unit or compressor fails, other outdoor units and compressors that can be operated will enter to
back-up operation;
(2) The classication of backup operation
①
The system is stopped: all the masters and slaves unit stop.
②
Single unit stop: The outdoor unit is stopped (the compressor of the abnormal unit stops).
③
Compressor stop: compressor unit stops (only abnormal compressor stops).
• It does not stop permanently when it stops abnormally, it will automatic recovery.
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