Translation from original instructions
Packaged Rooftop
77
We reserve the right to make changes without any prior notice.
UATYA
4P645202-2
8.4 Periodic checks
Carry out periodic checks to make sure the unit is working correctly:
OPERATION
RECOMMENDED
FREQUENCY
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
boards of the compressors. The moving and fixed contacts of the contactors must be cleaned
periodically 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
If the unit is to remain out of service for a long time, the valves on the delivery and intake lines
of the compressor must be closed.
Seasonal
Check the filling of the water circuit.
Monthly
Check that the differential water pressure switch, or the flow switch (where present), is working
correctly.
Monthly
Clean the metal filters in the hydraulic pipes.
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
Carry out the defrosting test (only for heat pump units).
Monthly
Check for foam in the evaporator sight glass.
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
Calibration of the refrigerant leak detector sensor
Yearly
Check that the cable glands in the unit are correctly tightened.
Yearly
Replacement of cartridge in refrigerant leak detector
400 days
Replacement of the refrigerant leak detector sensor
10 years
Check that the differential air pressure switch is in good working order.
Yearly
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.