Maintenance; Weekly Checks; Monthly Checks; Annual Checks - Trane LIFT 81-P Installation Operation & Maintenance

8 | Maintenance

8. MAINTENANCE
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 has observed, with, 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 has observed, with, 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.
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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.
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 unit.
Check that the unit and system drain valves are closed.
Open all vent valves of the unit, of the system and of the related
terminals.