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part
manifestations of malfunction
switching of the high-pressure
cooling circuit -
switch /HPS/; often switching of
high pressure
high-pressure limitation /HPL/
switching of low pressure switch
cooling circuit -low
/LPS/; part switching of low-
pressure
cooling circuit
switching of thermal protection or
cooling circuit
discharge temperature protection
hydraulic system
5.4. Maintenance
Regular service inspections
These service intervals and procedures are based on experience and may be changed depending on the complexity of the
installation. In some cases, it is necessary to shorten the service intervals (e.g. during continuous operation of the device,
difficult dust or climatic conditions, etc.).
Basic service maintenance is described in the Service Maintenance Protocol (Appendix). Service activities are divided
according to the planned period into Weekly inspections, Quarterly service maintenance and Annual service maintenance.
Weekly inspections can be realized by trained operators. Quarterly and annual inspections must be performed by a qualified
service technician with the completion of a report (appendix or similar form or service book of the equipment).
pressure limit /LPL/
noise and vibration
noise and vibration;
underperforming
very high air temperature compared to design value
polluted condenser
failure of the fan or its electrical connection
non-condensed gases in the condenser
closed shut off valve on the high-pressure side
refrigerant overloading
very high water temperature compared to design value
failure or incorrect setting of the high pressure transducer (HPT)
failure of the high-pressure switch (HPS) or its cable connection
very low air temperature compared to design value (very adverse weather
conditions)
fan malfunction
blockage in the liquid line - valve failure (solenoid, expansion), strained filter
dehydrator
lack of refrigerant, cooling circuit leakage
polluted evaporator or clogged water filter, low water flow
very low temperature or low water flow compared to design value
failure or incorrect setting of low pressure sensor (LPT)
failure of the low-pressure switch (LPS) or its cable connection
the weight distribution of the unit on the base frame or its position is not optimal
damage to the fan or cleansing on the impeller
failure of the mechanical part of the compressor, the clickable sound of the
compressor return valve when switching off does not have to indicate a failure
suction fluid or wrong direction of compressor rotation
loose compressor fixing screws
insufficient vibration compensation or incorrect pipe fixing
lack of compressor oil
failure of the mechanical parts of the compressor
electromechanical failure of the compressor motor, phase failure
see. high pressure
small amount or presence of air in the cooled medium
setting the pump operating point outside the characteristics
failure of mechanical parts of the pump
presence of contaminants in the hydraulic circuit
wrong setting or failure of the pump frequency inverter
mechanical failure of the check valve
FLOWAIR sp. z o.o. / OMSAC210708EN
possible causes
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