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Technical description
11.15 Hot-gas bypass valve
At partial load, the valve directly returns a part of the hot gas to the suction line of the refrigerating compressor. The
evaporation temperature and the evaporation pressure remain constant.
11.16 Refrigerant pressure switches LPS – HPS
To ensure the operational reliability and the protection of the dryer, a series of pressure switches are installed in the
gas cycle.
LPS :
Low-pressure appliance on the suction side of the compressor, which is triggered when the pressure dros
below the predetermined value. The values are reset automatically as soon as the nominal conditions are re-
established.
The high-pressure appliance on the discharge side of the compressor is activated when the pressure exceeds
HPS :
the predetermined value. The values are not reset automatically when the nominal conditions are re-
established. Reset takes place manually via a button on the appliance.
11.17 Compressor crankcase heater
During a longer downtime, the oil can intermix with the refrigerant. Therefore, "hydraulic shocks" may occur during the
start-up of the compressor.
To prevent this, a heating resistor was installed in the housing of the compressor which maintains a corresponding oil
temperature when the control panel is switched on and the compressor is idle.
Note!
The heating resistor needs to be switched on at least two hours prior to the start-up of the refrigerant
compressor.
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DRYPOINT® RS 700-3500 HP45 NA
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