Refrigerant Pressure Switches Lps - Hps; Compressor Crankcase Heater - Beko DRYPOINT RA 1300-4400 eco Instructions For Installation And Operation Manual

8.12 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 guard on the suction side of the compressor, which is triggered when the pressure drops below
the predetermined value. The values are reset automatically as soon as the nominal conditions are re-
established.
Calibrated pressure :
HPS : The high-pressure control unit on the discharge side of the compressor is activated when the pressure
exceeds the predetermined value. It has a manual reset button on the control itself.
Calibrated pressure :

8.13 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!
During short-term shut down (max. two to three days), it is advisable to leave the dryer and the control
panel connected to the supply current circuit. Otherwise, it would be necessary at a restart of the dryer to
wait two hours, until the oil in the compressor has reached the specified operating temperature.
DRYPOINT® RA 1300-4400 eco
R 134.a Stop 0.7 barg - Restart 1.7 barg
R 407 C Stop 1.7 barg - Restart 2.7 barg
R 134.a Stop 20 barg - Manual reset (P<14 bar)
R 407 C Stop 30 barg - Manual reset (P<23 bar)
Technical description
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