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CONTROL
Condition to decrease fan air volume
8) Oil Bypass Control Valve
Oil bypass control valve is used for apparent engine speed demand control, abnormal compressor intake
temperature avoidance control, and abnormal compressor intake degree of superheat avoidance control.
1. Oil bypass control valve open position range
0 ~ 500 steps (common to cooling and heating)
2. Initial open position
0 ~ 500 steps (common to cooling and heating)
3. Control during normal operation
<Common to cooling and heating>
This control sets standard open position for apparent engine speed so that the oil bypass amount suitable
for the amount of circulating refrigerant is maintained.
However, this control sets the upper limit of open position to prevent excessive rise of compressor intake
temperature, and also sets the lower limit of open position to prevent excessive fall of compressor intake
degree of superheat.
9) Compressor Heater
To protect the compressor, the system controls heater energization during engine stop.
10) Drain Filter Heater / Drain Hose Heater
To prevent freezing of the exhaust water drain filter and hose, the system controls heater energization depending
on outside air temperature regardless of whether the engine is running or not.
The engine compartment temperature is lower than the specified value. OR
The difference between outside air temperature and low pressure equivalent temperature is smaller
than the specified value and the engine coolant temperature is lower than the specified value.
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