Description Of The Operations - Mitsubishi Electric MECH-iS-G07 Instructions For Installation, Use And Maintenance Manual

9 MAINTENANCE

9.2 Description of the operations

Tighten the electrical connections and replace any worn or damaged cables
Check for any leaks on the cooling circuit. Perform this operation at the frequencies
indicated in the relative European regulations
Check the unit power supply voltages
Check the compressor power supply voltages
Check the fan power supply voltages
Functional check of the antifreeze heaters of the exchangers and, if applicable, piping,
pumps, storage tanks and condensate drain pan
Check the operation of solenoid valves
Check the operation and calibration of minimum and maximum safety pressure switches
(where fitted)
Check the pressure probe reading, calibration
Check the condition of the hoses
Check the wear on the compressor contacts
Check the wear on the fan contacts
Check the noise level of the fan bearings
Maintenance and cleaning of finned coils
Check for any hydraulic circuit leaks
Check the horizontal positioning of the unit
Check for rust on the cooling circuit, especially the pressure vessels. Apply appropriate
surface protection if necessary
General unit cleaning
Vent the water circuit and heat exchangers (the combination of fluid and air reduces
performance and can cause corrosion)
Measure overheating temperature value
Measure overcooling temperature value
Measure compressor discharge gas temperature value
Measure low pressure value
Measure high pressure value
Measure fan absorption, 3 phases (L1, L2, L3) or single phase where single-phase fans
present
Measure compressor absorption, 3 phases (L1, L2, L3)
Measurement of the absorption of the pump on the machine, 3 phases (L1, L2, L3)
(if present)
Check the flow of water to the exchangers
Measure evaporator and condenser inlet and outlet water temperature where fitted
Installation, use and maintenance manual - Translation of the original instructions
RECOMMENDED PLANNED MAINTENANCE ACTIVITIES
Operation description
Preliminary
Frequency*
3/4 6
months months months
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see para 9.4.
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EN
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