UM_NX-W_00_05_19_ML
EN
MITSUBISHI ELECTRIC HYDRONICS & IT COOLING SYSTEM S.p.A.
45
Translation of the original instructions
9.2
Description of operations
Recommended periodic maintenance interventions
Operation description
Frequency*
3/4 months
6 months 12 months
24 months
operating hours
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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
•
Check the operation of exchanger and/or pipe anti-
freeze resistances (where fitted)
•
Check the operation of solenoid valves
•
Check the operation and calibration of minimum and
maximum safety pressure switches (where fitted)
•
Clean the safety valve drains
•
Replace or calibrate the operation of safety valves
•
Check the pressure probe reading, calibration
•
Check and if necessary, replace the dehydrator
filters on the liquid line
•
Check the condition of the hoses
•
Check the wear on the compressor contacts
•
Check the wear on the fan contacts
•
Check for any leaking of the liquid
•
Check evaporator resistance operation
•
Check horizontal unit positioning
•
Check the presence of rusting on the cooling circuit
especially as regards 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)
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Measure overheating temperature value
•
Measure overcooling temperature value
•
Measure compressor discharge gas temperature
value
•
Measure low pressure value
•
Measure high pressure value
•
Measure compressor absorption, 3 phases (L1, L2,
L3)
•
Measure pump absorption where fitted on the
machine, 3 phases (L1, L2, L3)
•
Measure outdoor air temperature
•
Check the flow of water to the exchangers
•
Measure evaporator and condenser inlet and outlet
water temperature where fitted
•