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8. Maintenance
8.1
Maintenance
8.2
Weekly checks
8.3
Monthly checks
8.4
Annual checks
8.5
Water circuit
8.6
Refrigerant circuit
8.7
Decommissioning and disposing
8.1 Maintenance
Regular maintenance is essential to maintain the efficiency of the unit in terms of operation and
energy.
The maintenance schedule that the Service or the Refrigerator Technician must observe with
regular frequency, involves the following operations and checks.
8.2 Weekly checks
Regular maintenance is essential to maintain the efficiency of the unit in terms of operation and
energy.
The maintenance schedule that the Service or the Refrigerator Technician must observe with
regular frequency, involves the following operations and checks.
8.2.1 Routine maintenance
The routine maintenance operations are the cleaning and control of machine components or
parts that may compromise its operation, safety or efficiency.
These operations must be performed by qualified personnel and enabled to work on this type of
products.
All maintenance operations must be performed with the machine off and electrically isolated,
paying particular attention to the safety instructions and laws in force in the country of operation.
The machine can be restarted after completing the routine maintenance operations, checking its
proper operation.
8.2.2 Extraordinary maintenance
The extraordinary maintenance operations are the replacement and the repair of machine
components or parts that compromise its operation, safety or efficiency.
These operations must be performed by qualified personnel and enabled to work on this type of
products.
All maintenance operations must be performed with the machine off and electrically isolated,
paying particular attention to the safety instructions and laws in force in the country of operation.
After completing the repair and replacement operations, the machine can be restarted following
the first start-up instructions, verifying its proper operation.
8.3 Monthly checks
• Verify the tightness of the terminals inside the electrical board and in the terminal board of the
compressors. Check the mobile and fixed contacts of the remote switches and replace them if
deteriorated.
• Verify the complete tightness of the fuse holder caps.
• Verify the proper refrigerant charge in the circuit through the liquid and humidity indicator.
• Check that the compressor is not leaking oil.
• Verify that the fan of the electrical board (if applicable) works properly.
• Verify that there are no abnormal vibrations of the compressor.
• Verify that the power consumption of the compressor falls within the plate limits.
• Verify that the temperatures and pressures of the compressor fall within those indicated for
proper operation.
• Check that the water circuit does not leak water.
• Vent the hydraulic system.
• Check any compressors crankcase heaters.
• Clean the metal filters in the hydraulic pipes.
• Clean the finned coil (and the relative metal filters, if applicable), using a jet of compressed air,
aimed in the opposite direction of the air flow. If the filters are particularly clogged, use a
water jet.
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• Verify that the noise emission of the machine is regular.
• Check that any antifreeze heaters are working properly.
• Verify that the following safety devices work properly:
- High pressure switch;
- Low pressure switch;
- Compressor protection module;
- Water flow switch;
- Defrost sensor;
- Check the correct reading of the temperature and pressure sensor.
• Check the following operating factors:
- Subcooling and superheating of the refrigerant;
- No bubbles on the liquid indicator;
- Refrigerant leaks near the joints;
- Proper closure of the solenoid valve (if applicable);
- The temperature difference of the liquid used for utilities between inlet and outlet.
8.4 Annual checks
• Proceed with the verification of the fastening, balancing and general conditions of the fans.
• Verify the colour of the liquid and humidity indicator; if the colour indicates a wet circuit, the
filter must be replaced.
• Check the condition of the paint: any scratches should be touched up to prevent corrosion.
• Verify the cleanliness of the heat exchanger on the air side.
• Verify the cleanliness of the metal guard filter on water circuit.
8.5 Water circuit
8.5.1 Water circuit load
• Before starting to load, set the main switch of the system to "off".
• Open the rear inspection panel of the chiller.
• Verify that the drain cocks of the chiller and the system are closed.
• Open all the vent valves of the chiller, the system and the relative terminals.
• Open the shut-off devices of the system.
• Start filling by slowly opening the system water fill-up valve outside the unit.
• When water begins to leak from the air vents, close them and continue filling until the
expected system pressure value is reached.
Verify the hydraulic tightness of the joints.
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