Periodic Checks - BlueBox Datatech Installation, Use And Maintenance Manual

7.4 Periodic checks

Carry out periodic checks to make sure the unit is working correctly:
OPERATION
Check the operation of all the control and safety equipment as described previously.
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.
Check the refrigerant charge through the liquid sight glass.
Make sure there are no oil leaks from the compressor.
Make sure there are no water or water/glycol mixture leaks in the hydraulic circuit.
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.
Check the filling of the water circuit.
Check that the differential water pressure switch, or the flow switch (where present), is working cor-
rectly.
Check the crankcase heaters of the compressors.
Clean the metal filters in the hydraulic pipes.
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.
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.
Clean the air filters
Clean the ventilation filters of the electrical control panel.
Carry out the defrosting test (only for heat pump units).
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.
Check the condition, fixing and balance of the fans.
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.
Check that the noise emitted by the unit is normal.
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.
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Translation from original instructions We reserve the right to make changes without any prior notice.
RECOMMEN-
DED FREQUEN-
CY
Monthly
Monthly
Monthly
Monthly
Monthly
Seasonal
Monthly
Monthly
Monthly
Monthly
Monthly
Monthly
Monthly
Monthly
Monthly
4 months
4 months
4 months
4 months