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Be careful when working near the condensing coils. The aluminium fins are very sharp and can cause serious injuries. Always
use appropriate personal protective equipment.
After the maintenance operations, close the panels by fixing them with screws. Pay particular attention to the correct closing
of the electrical panel box.
After the maintenance operations, pay attention to the correct tightening of the cable gland designed for the passage of the
electric power cable.
It is recommended to have specialised personnel perform periodical inspections and maintenance. The EU regulation
n.517/2014 establishes that users must perform regular inspections on the plants, checking water tightness and eliminating
any leaks as quickly as possible. Verify the mandatory nature and the documentation required in regulation n.517/2014 and
its subsequent amendments or repeals.
The following are the recommended and mandatory activities for correct operation of the unit. The mandatory activities must be carried out
by an authorised customer service which issues a corresponding certificate. Failure to comply with these activities will entail forfeiture of the
warranty and could considerably shorten the service life of your product.
Filling the water circuit.
Presence of bubbles in the water circuit.
Check the proper working of the safety and control devices.
Check that there are no oil leaks from the compressor.
Check if there is a possible water leakage from the water circuit.
Check that the flow switch works properly.
Check that the crankcase heaters are powered and running.
Clean the metal filters of the water circuit.
Clean the finned coil with compressed air or water jet
Check that the electric terminals both inside the electric panel and in the terminal blocks of the
compressor are well tightened.
Tightening of plumbing connections.
Check fixing and balancing of the fans.
Clean the air filters in the electrical panel or replace them if necessary (when present).
Correct electric voltage and phase imbalance (without load and under load).
Correct absorption.
Check the refrigerant charge and eventual leaks
Check the operating pressure, superheating and sub-cooling
Circulation pump efficiency.
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 temperature is expect-
ed 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 concen-
tration of glycol
Check the pressure drops of any filter driers on the liquid line
Check the hydronic side safety valve
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.
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OPERATION
Picco R32
Air/Water heat pumps with axial fans
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