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3.3
YEARLY EQUIPMENT CHECK AND
MAINTENANCE.
The following checks and maintenance should be
performed once a year to ensure operation, safety and
efficiency of the appliance over time.
- Check for water leaks or oxidation from/on the fittings.
- Check, after discharging the system pressure and bringing it to
zero (read on indoor unit pressure gauge), that the expansion
vessel charge is at 1.0 bar.
- Check that the system static pressure (with system cold and after
refilling the system by means of the filling valve) is between 1
and 1.2 bar.
- Visually check that the safety and control devices have not been
tampered with and/or short-circuited.
- Check the condition and integrity of the electrical system and
in particular:
- the power cables must be inside the cable fixings;
- there must be no traces of blackening or burning.
- Check correct lighting and functioning.
- Check correct operation of control and adjustment devices of
the appliance. and in particular:
- system regulation probes intervention.
- Check chiller line connections.
- Check mesh filter on system return.
- Check the correct flow rate on plate heat exchanger.
- Check the integrity of the internal insulation.
In addition to yearly maintenance, one must also check
the energy efficiency of the thermal system, with fre-
quency and procedures that comply with the indications
of the technical regulations in force.
56
3.4
EXTERNAL UNIT FINNED AIR COIL
MAINTENANCE.
We recommend regularly inspecting the finned air coils
to check the level of fouling.
This depends on the environment where the unit is installed.
The level of fouling will be worse in urban and industrial sites, as
well as near trees that lose their leaves.
There are two maintenance levels to clean the coils:
- If the air heat exchangers are encrusted, clean them gently with
a brush in a vertical direction.
- Turn off the fans before working on the air heat exchangers.
- To perform this type of intervention, stop the unit only if the
maintenance considerations allow it.
- Perfectly clean air heat exchangers ensure an optimal operation
of the unit. When the air heat exchangers begin to encrust, they
must be cleaned. The cleaning frequency depends on the season
and location of the unit (ventilated, wooded, dusty, etc.).
- Do not use pressurised water without a large diffuser. Do not
use high-pressure cleaners for Cu/Cu and Cu/Al air coils.
- Concentrated and/or rotating water jets are strictly prohibited.
Never use fluid with a temperature above 45°C to clean the air
heat exchangers.
- Proper and frequent cleaning (approx. every three months)
prevents 2/3 of corrosion problems.
Clean the air coil using suitable products.
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