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We reserve the right to make changes without any prior notice.
Translation from original instructions
7.4 Periodic checks
Carry out periodic checks to make sure the unit is working correctly:
OPERATION
RECOMMEN-
DED FREQUEN-
CY
Check the operation of all the control and safety equipment as described previously.
Monthly
Check the tightness of the electrical terminals in the electrical control panel and in the terminal bo-
ards of the compressors. The moving and fixed contacts of the contactors must be cleaned periodi-
cally and should be replaced whenever they show signs of deterioration.
Monthly
Check the refrigerant charge through the liquid sight glass.
Monthly
Make sure there are no oil leaks from the compressor.
Monthly
Make sure there are no water or water/glycol mixture leaks in the hydraulic circuit.
Monthly
If the unit is to remain out of service for a long time, drain the water from the pipes and the heat
exchanger. This operation is necessary if ambient temperatures lower than the freezing point of the
fluid used are expected during the time it is to remain stopped.
Seasonal
Check the filling of the water circuit.
Monthly
Check that the differential water pressure switch, or the flow switch (where present), is working cor-
rectly.
Monthly
Check the crankcase heaters of the compressors.
Monthly
Clean the metal filters in the hydraulic pipes.
Monthly
Clean the finned coil by following the instructions in the section entitled “Recommendations for car-
rying out maintenance and cleaning of finned coils” according to the type of coil installed.
Monthly
If the unit also has metal filters, clean them with compressed air blown in the opposite direction to
that of the air flow during operation. Use a jet of water if they are completely clogged.
Monthly
Clean the air filters
Monthly
Clean the ventilation filters of the electrical control panel.
Monthly
Carry out the defrosting test (only for heat pump units).
Monthly
Check the moisture indicator on the liquid sight glass (green = dry, yellow = wet). If the indicator is
not green, as indicated on the sight glass sticker, replace the filter.
4 months
Check the condition, fixing and balance of the fans.
4 months
In units with belt and pulley driven fans, check the drive belts for wear and correct tension. To check
the tension of the belts, press down perpendicularly on the belt at the central point with a force of
about 5 kg. The central point of the belt should move by 10 to 12 mm; as regards wear, replace the
belts if they are cracked, frayed or scuffed or have any other obvious damage.
4 months
Check that the noise emitted by the unit is normal.
4 months
This planning refers to an average installation; there could be installations in which it may be necessary to
increase the frequency of some checks.
Current legislation may require considerably longer intervals on periodic checks than the recommended
ones, also in reference to the safety devices installed and to the refrigerant charge present, without causing
the warranty on the unit to be voided.