0906-E
18
HIGH PRESSURE UNLOADING
Function
Reduce the capacity of a refrigeration circuit before the HP cut out is reached
Description
High Pressure Unloading consists in reducing the variable capacity on a screw compressor, or to stop one
compressor on units fitted with tandems or trios. The value of the high pressure unloading can be adjusted in
menu 3616.
Note that in the menu the pressure unloading is expressed in bar relative. If in menu 3616 the value is set to
the maximum the unloading function is then disabled. In this case there will be no compressor unloading until
the high pressure cut out is reached.
Factory set points for menu 3616:
Ecologic = 26.5 bar (R407c)
Ecomax = 22 bar (R407c)
$ Activation of High Pressure Unloading
If High Pressure is over the compressor unloading set point (menu 3616) and carries on increasing as all the
fans are running full speed, one compressor is stopped, or one stage of capacity reduction (for screw
compressors) is activated on the affected circuit.
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