82
EN
Cod. 3542B230 - Rev. 00 - 02/2022
OMNIA S HYBRID H 3.2
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.
13.4 Unscheduled maintenance and replacement of heat pump components
13.4.1 Heat pump circulator
NOTE
Before starting with the following instructions, we recommend organising protective devices to protect the inner parts and the electrical system of the
indoor unit from any accidental water leaks.
5
6
7
fig. 50 - Replacement/maintenance of the heat pump circulator
• Disconnect the electrical power supply and close the gas tap upstream of the valve.
• Disconnect the power supply to the circulator by releasing the connections and raising the detail “5 and 6”
• Drain the water from the indoor unit.
• Unscrew and remove the circulator motor unit (“7” of fig. 50) and remove the circulator.
