Ferroli OMNIA S HYBRID C 3.2 Installation, Use & Maintenance Manual Download

Page: 79 / 88

Cod. 3542B250 - Rev. 00 - 02/2022

OMNIA S HYBRID C 3.2

Poor fastening causes noise and abnormal vibrations.

• Hydraulic system check

Visually check that the hydraulic circuit does not have any leaks. Check that the water filters are clean.

• Electrical system check

Check that the unit supply cables are not split, cracked or altered in any way that could compromise the insulation.

Perform an accurate visual inspection of the components of the electrical panel to check for damaged or badly connected components or cables (check

the tightness of the terminal screws).
• Check the finned coil and fans (outdoor unit)

The finned coil exchanger consists of fins made of aluminium or other thin material, so any contact, even accidental, could cause injury from cuts.

Finned coil

Given the function of this component, it is important that the exchanger surface is free from any obstructions cause by objects that could decrease the fan air flow rate

and thus, the performance of the unit. The potential tasks to carry out are:

• removing all the impurities with a brush or by hand, such as paper, leaves, etc. which could obstruct the coil surface;

• if objects are deposited on the fins and removing them manually proves difficult, use a pressurised air or water jet on the surface of the aluminium coil, taking care

to aim the jet vertically to the coil to avoid damaging the fins and in the opposite direction of the air movement induced by the fan;

• comb the fins with the right spacing of the teeth for fins if parts of the fins are bent or crushed.

Fans

Carry out a visually inspection of the support grille and unit structure grille. Check the fan bearings and the closure of the box terminal covers and cable glands. Dete-

riorated bearings cause noise and abnormal vibrations.

•

Heat pump

water exchanger check

The exchanger must guarantee the maximum thermal exchange possible, so it must be free from any build-up or dirt that could reduce its efficiency. Check that the

difference in temperature between the output water and the evaporation/condensate temperature does not increase. If the difference exceeds 8-10°C, the exchanger

must be cleaned on the water side, taking care to follow these indications: the water circulation must be in the opposite direction compared to the normal one, the fluid

speed must not exceed 1.5 times the rated speed, use water or mildly acidic materials for washing and clean water only for the subsequent rinse.

• Water filter check

Check the cleanliness of the water filter and eliminate any impurities that obstruct the correct water flow, contributing to the load losses and thus, the energy consump-

tion of the pumps.

• Heat pump circulation

pump check

Check for the absence of water leaks.

CAUTION

After unscheduled maintenance work on the cooling circuit with the replacement of components, carry out the fol-

lowing tasks before restarting the machine:
•  Pay the utmost attention when restoring the refrigerant load indicated on the machine rating plate.
•  Open all the valves in the cooling circuit.
•  Connect the electric power supply and grounding correctly.
•  Check all the hydraulic connections.
•  Check that the water pump is working correctly.
•  Clean the water filters.
•  Check that the finned coils are not dirty or clogged.
•  Check that the fans are turning correctly.
•  Check the correct intervention of the safety devices with particular attention to the water differential pressure

switch and/or water flow switch.

13.5 Unscheduled maintenance and replacement of heat pump components

13.5.1 Heat pump circulator