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We recommend keeping track of the interventions carried out on the unit so as to make any
troubleshooting easier.
In case of failure or malfunctioning:
check the type of alarm triggered to report it to the assistance centre;
contact an authorised assistance centre;
if requested by the assistance centre, immediately deactivate the unit without resetting the alarm;
request that original spare parts be used.
8
SHUTDOWNS FOR LONG PERIODS
The shutdown mode of the plant depends on the site of application and the time the plant is expected to be
shut down. If the unit is equipped with the antifreeze system, even when off (system on unit at “off”
position), the antifreeze system keeps running if power supply continuity to the equipment is guaranteed. If
the system is expected to remain idle for a long period of time, it is recommended to empty the liquid from
the system unless there is an adequate amount of glycol.
To switch off the unit completely after having emptied the system:
Switch off the unit setting the switch of each appliance at “OFF”.
Close the water valves
Set the general residual current device at “OFF” (if installed upstream of the system).
If the temperature drops below zero there is serious danger of frost: provide a mixture of water
and glycol in the system, otherwise drain the water system and the circuits of the heat pump.
CAUTION: even the transient operation, with water temperatures below +5°C is not guaranteed
on the basis of the limits established in Paragraph 12.4. Before you turn the unit back on after a
long idle period, make sure that the temperature of the mixture of water and glycol is higher
than or at least equal to +5°C.
9
MAINTENANCE AND PERIODIC CHECKS
CAUTION: All the operations described in this chapter MUST BE CARRIED OUT BY QUALIFIED
PERSONNEL ONLY. Before performing any intervention on the unit or accessing internal parts,
make sure you have disconnected power. The heads and delivery pipe of the compressor are
normally quite hot. Be careful when working near the condensing coils. The aluminium fins are
very sharp and can cause serious injuries. After servicing operations, re-install the cover panels,
and fix them by means of screws.
CAUTION: Before starting to operate, safety checks must be performed to ensure the combustion
hazard is reduced to the minimum. The work must be undertaken according to a controlled
procedure, to reduce to the minimum the risk of flammable gases or vapours while performing
the work. The area must be checked with an appropriate refrigerant fluid detector before and
during the work.
It is prohibited to fill the refrigerant circuits with a refrigerant other than that indicated on the
identification plate. Using a different refrigerant can cause serious damage to the compressor.
It is prohibited to use oils other than those indicated in this manual. Using a different oil can
cause serious damage to the compressor
The heads and delivery pipe of the compressor are normally quite hot.
Be careful when working near the condensing coils.
The aluminium fins are very sharp and can cause serious injuries.
After the maintenance operations, close the panels by fixing them with screws.
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
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