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Technical description
11.15 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.
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.
11.16 Safety temperature switch TS
2
1
11.17 Compressor crankcase heater (RS 180-550 3phase)
At low temperatures, the oil can more easily intermix with the refrigerant gas. When the compressor starts, oil can be
drawn into the refrigeration cycle, leading to "hydraulic shocks".
To prevent this, a resistance heater is installed in the suction side of the compressor. When the system is connected with
the electric mains and the compressor is idle, the heater will keep the oil at the correct temperature.
This heater is controlled via a temperature switch which prevents the overheating of the oil.
Note: The heater must be connected to the mains at least a few hours prior to the start-up of the refrigerating compressor.
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To ensure the operational safety and the soundness of the dryer, a safety
temperature switch (TS) is installed at the refrigeration cycle. In the event that the
pressure gas temperature is too high, the sensor of the temperature switch will stop
the refrigerating compressor to prevent the pressure gas temperature getting too
high.
The temperature switch is reset manually, but only when the normal operating
conditions are reached again. Unscrew the cover (see pos. 1 in the illustration) and
press the reset button (see position 2 in the illustration).
DRYPOINT® RS 15-550 HP50 NA
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