Mitsubishi Electric NX-W Installation And Operating Manual page 45

UM_NX-W_00_05_19_ML
9.2 Description of operations
Operation description
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)
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
MITSUBISHI ELECTRIC HYDRONICS & IT COOLING SYSTEM S.p.A.
Recommended periodic maintenance interventions
3/4 months 6 months 12 months
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45
Frequency*
24 months operating hours
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Translation of the original instructions
EN