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Cod. 3541T090 - Rev. 00 - 06/2019

MAINTENANCE

Bad fixing gives rise to noise and abnormal vibrations.

• Inspection of hydraulic circuit

Check visually to make sure that there are no leaks in the hydraulic circuit. Check that water lters are clean.

• Inspection of electrical system

Make sure that power cables that supply the unit are not torn, cracked or damaged in a way that could impair its insulation.

Perform a thorough visual inspection of the components of the electrical panel to check for the presence of damaged or not well connected components or cables

(check the tightening of the terminal screws).

• Inspection of the ventilated condensing/evaporating section

WARNING: e nned pack exchanger has ns made of aluminium or some other thin material, thus even accidental contact could cause cuts.

Condensing/Evaporating coils

In view of the function of this component, it is very important for the surface of the exchanger to be as free as possible from clogging caused by items that could reduce the fan’s air ow rate and, thus, the

performances of the unit itself.

e following operations may be required:

- Remove all impurities (such as paper scraps, leaves, etc.) that could be clogging the surface of the bank either by hand or using a brush (comply with the above mentioned safety prescriptions).

- If the dirt has deposited on the ns and is dicult to remove by hand, use a ow of compressed air or pressurized water on the aluminium surface of the coils, remembering to direct the ow in a vertical

and opposite to the standard ow direction to prevent the ns from being damaged.

- “Comb” the coils with the relative tool, using the appropriate comb spacing for the ns if some parts of them are bent or squashed.

Axial fans

Visually inspect these parts to make sure that the fans are well xed to the bearing grille and that this latter is xed to the structure of the unit. Check the fan bearings, and close the terminal box and cable

glands. Bearings damaged and bad xing are the source of abnormal noise and vibrations,

• Heat pump - Inspection of the water heat exchangers

e exchangers must ensure the maximum heat transfer possible so keep them clean and free from dirt that may reduce eciency; make sure that the temperature dierence between water outlet temperature

and evaporation/condensation does not increase over time, if the dierence exceeds 8 -10 ° C it is necessary to proceed cleaning the water side of the exchanger, keeping in mind the following: water circulation

must be in the opposite direction than normal, the uid velocity does not exceed 1.5 times the nominal velocity and use just water or moderately acid products but only water for nal washing.

• Inspection of the water lters

Make sure to clean the lter and remove any impurities that block the proper ow of water, contributing to increase pressure drop and therefore energy consumption of the pumps. Refer to the section

“Hydraulic Connections” too.

• Heat pump - Inspection of the water pumps

Check water leakages, the state of the bearings, the closing of the terminal box and integrity of the cable. Bearings damaged and bad xing are the source of abnormal noise and vibrations,

BCAUTION

As a result of extraordinary maintenance on the cooling circuit with component replacement, before restarting the

machine, perform the following steps:

- Pay attention to restore the refrigerant charge indicated on the name plate of the machine.

- Open all the ball valves in the refrigerant circuit.

- Correctly connect the power supply and grounding.

- Check the hydraulic connections.

- Check that the water pump is working properly.

- Clean water filters.

- Check that the finned coils are not dirty or clogged.

- Check the proper rotation of fans.

- Check correct operation of safety devices with particular attention to differential water pressure switch and / or