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NOTE: CONDENCIAT 80 to 700 machines use R410A refrigerant; technicians must therefore use equipment compatible with
R410A and which has an operating pressure approximately 1.5 times higher than that of equipment compatible with R22 or R407C
refrigerant.
22.6 Weekly checks
With the unit running at full capacity, check the following values:
- LP compressor suction pressure
- HP compressor discharge pressure
- The water inlet and outlet temperatures in the exchangers
- The charge via the liquid sight glass and the condition of the charge using the coloured indicator on the sight glass.
- The oil level and its appearance. If the colour changes, check the quality.
22.7 Monthly checks
Check all the values listed in the "Operating readings" table on the next page.
Check for corrosion on all metal surfaces (frame, casing, exchangers, electrics boxes, etc.)
Make sure that the insulating foam is neither detached nor torn.
Check the energy transfer fluids for any impurities which could cause wear or corrosion in the exchanger.
Check the circuits for leaks.
Check whether the safety devices operate correctly.
22.8 Annual checks
Carry out the same inspections as during the monthly checks.
Test the oil for contaminants: if acid, water or metal particles are detected in the oil, replace it in the corresponding circuit and the
dryer. If all the oil must be emptied, replace it solely with new oil of the same grade as the original oil and stored in a hermetically
sealed container until its time of use. If 3MAF oil is unavailable for sizes 80 to 700, use ICI Emkarate RL 32 CF oil or Mobil EAL
Arctic 22 CC oil.
Check the dehumidifier filter for fouling (measure the difference in the temperature of the copper pipes at the dryer inlet and outlet).
Check the electrical connections to ensure they are tight and in good condition.
Check the motor insulation.
Check the condition of the contacts and the current at full load on all three phases.
Check the electrics box for water seepage.
23 - TROUBLESHOOTING OPERATING PROBLEMS
23.1 Preliminary advice
faults detected by the safety devices are not necessarily caused by a sudden change in the value being monitored.
Taken regularly, readings should make it possible to anticipate future trips.
Perform the checks listed in the table below if you notice that a value deviates from its normal value and gradually moves closer
to the safety limit.
Important: first and foremost, bear in mind that most faults potentially occurring on the units have simple causes that are often the
same for all. Look for these causes first.
There are three such causes in particular:
● Exchanger fouling
● Problems with the fluid circuits
● Failures of electrical components such as the relay coil or the electrical valve, etc.
NA06.130 C
EN - 14
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