Translation of the Original ENGLISH DESCRIPTION OF THE P030 CHILLER
454522.68.07-01-E
15
27.06.2012
2.5 Safety Devices
The P030 Chiller is equipped with the following safety devices:
High-pressure control (HP)
The high-pressure control is designed to protect the P030 Chiller against extremely high operating
pressure in the refrigeration circuit. In the event of a malfunction, the HP control switches the P030
Chiller off and the malfunction is indicated on the control panel of the control and operating unit.
The P030 Chillers cannot be restarted until the pressure has dropped to the preset pressure
difference and the Reset button on the high-pressure pressostat has been pressed. The pressostat
is accessible from the service side.
Power disconnect switch (main switch)
In an emergency, the P030 Chiller must be switched off by means of the main switch.
2.6 Monitoring Devices
Low-pressure control (LP)
The low-pressure control protects the P030 Chiller against extremely low operating pressure in the
refrigeration circuit. In the event of a malfunction, the control switches off the P030 Chiller, and the
malfunction is indicated on the control and operating unit. Restarting of the P030 Chiller is effected
automatically as soon as the pressure has risen by the preset pressure difference.
Compressor overheat protection
Each compressor is equipped with an overheat protection (thermal contact, Klixon). In the event of
an increase in motor current in conjunction with a rise in the winding temperature, the overheat
protection trips, and the compressor is switched off. The overheat protection resets itself
automatically after the windings have cooled down. This malfunction is not indicated on the control
and operating unit.
Thermal contact – fan motor
In the event of an increase in motor current in conjunction with an increase in winding temperature,
cooling operation is switched off by the thermal contact. This malfunction is indicated on the control
and operating unit.
Circuit breakers (compressor, fan, pump)
In the event of an increase in motor current or in the case of short circuits, the circuit breaker trips
and interrupts the power supply. Such malfunctions are indicated on the control panel. The circuit
breakers are located in the control cabinet.
Flow and pressure switches in the water circuit
The flow switch shuts off the pump when the preset volume flow limit value is fallen short off and
sends a corresponding signal to the control and operating unit.
The pressure switch does not signal the malfunction to the control and operating unit if a pressure
increase in the water circuit exceeds the preset value.
Fan control
The condensation pressure is controlled by cycling the individual fans on and off. This type of
control permits an adaptation to different operating conditions at relatively constant condensation
temperatures.
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