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If the unit should be out of service for a long period, drain water from the pipes and from
the heat exchanger. This operation is necessary if, during seasonal stoppages, ambient tem-
perature is expected to go down below the freezing point of the employed fluid.
Check for corrosion/oxidation.
Check panel fastening.
Check the water quality (see chapter Characteristics of the system water) and the possible
concentration of glycol.
Check the pressure drops of any filter driers on the liquid line.
Check the hydronic side safety valve according to EN 806-5.
Cleaning the deaerator.
9.1 CLEANING THE FINNED COIL
To correctly clean the coil, follow the instructions below:
• Remove surface dirt. Deposits such as leaves, fibres etc. should be removed using a vacuum cleaner (use a brush or other soft accessory
and avoid rubbing against metal or abrasive parts). If compressed air is used, care must be taken to keep the airflow perpendicular to the
surface of the battery to avoid bending the aluminium fins. Pay attention not to bend the fins with the nozzle of the compressed air lance.
• Rinse. Rinse with water. It is possible to use chemical substances (specific detergents for finned coils). Rinse the coils by letting the water run
inside each individual passage of the fins, until they are perfectly clean. Pay attention to direct the water jet perpendicular to the surface
of the coil in order not to bend the aluminium fins. Do not strike the coil with the water hose. Apply your thumb at the end of the hose to
increase the pressure of the water jet instead of using specific nozzles which could damage the coil.
9.1.1 Cleaning the finned coils treated with the anti-corrosion method
The anti-corrosion treatment applied to the finned coils (available as an alternative to the standard coils) guarantees protection against aggres-
sive atmospheres.
The frequency of cleaning depends on the environmental conditions and is left to the common sense of the maintenance staff. When oxidizing
dust or grease particles are observed on the battery surface, cleaning is recommended. In general, in a slightly polluted atmosphere, it is recom-
mended to carry out the cleaning treatment every three months.
Washing should be carried out with preferably hot water (40-60 ° C) and detergent with neutral pH, while rinsing is carried out with abundant
fresh water (50 l / m2).
If the maintenance staff observes a lack of protective cover on the edge of the fins, it is necessary to contact the nearest service center to pro-
ceed with a new application of the cover and completely restore the protection against corrosion.
CAUTION: Do not clean the coil using high-pressure cleaners so as not to apply excessive pressure which could cause irrepa-
rable damage. Damage caused by cleaning with unsuitable chemical substances or excessively high water pressure will not
be recognised under warranty.
CAUTION: The aluminium fins are thin and sharp. Pay the utmost attention and use appropriate PPE to avoid cuts and abra-
sions. Cover your eyes and face appropriately to avoid squirting water and filth while blowing. Wear waterproof shoes or
boots and clothing covering your entire body.
For units installed in aggressive atmospheres with a high fouling rate, cleaning of the coil must be part of the routine main-
tenance program. In these types of installations, all of the dust and particulates deposited on the coils must be removed as
soon as possible through regular cleaning according to the methods shown above.
9.2 CLEANING OF EXTERNAL SURFACES
The sheets of the outer casing must be properly cleaned to avoid the accumulation of dust / dirt, preventing the onset of corrosion. The painting
ensures resistance to atmospheric agents but it is good practice to make sure to remove any dirt present, cleaning the surfaces with neutral
detergent and water, especially if the unit is installed in places with an aggressive atmosphere (high level of pollution, salt, etc.).
9.3 EXTRAORDINARY MAINTENANCE
All extraordinary maintenance works must be carried out by an authorised assistance centre.
All maintenance and inspection operations must be carried out only by QUALIFIED PERSONNEL (IEC 60335-2-40 Annex HH).
All equipment used during maintenance operations must be compatible with the refrigerant gas R290.
Some extraordinary maintenance work may involve the replacement of broken components, which may have significant mass. Below is a list
of components (standard and optional) and the approximate weight per piece (please note that any residual oil, liquid gas, water may increase
the weight). Refer to the table before the maintenance phase (or refer to the label on the component itself) and choose the most suitable
equipment/posture for the work to be carried out, taking into account the load limits load imposed by technical standards and the worker's own
health and capacity.
44
OPERATION
i-290
Inverter air/water heat pumps with axial fans
1
4
M / R
month
months
M
R
R
M
R
R
M
6
12
months
months
x
x
x
x
x
x
x
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