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7. Service
Maintenance is an essential operation for safety, correct boiler
operation, and system durability.
It must be carried out in accordance with applicable regula-
tions.
You should regularly check the refrigerant gas pressure.
Before beginning maintenance work:
– Disconnect the power supply to the system.
– Close the circuit heating water and domestic hot water
taps.
Initial safety checks:
– check that the condensers are empty; this must be
done safely to prevent possible sparks;
– check that no live component and electrical wiring are
exposed during charging, recovery or purging of the
system;
– check that the earthing connection is uninterrupted.
i
The minimum water temperature in heating
mode, in order for the system to function cor-
rectly, is 20°C. In the absence of back-up energy
sources, if the water temperature is below 20°C
there could be problems during the machine
start-up phase. IT IS FORBIDDEN TO ELECTRI-
CALLY DISCONNECT THE INTEGRATED HEATING
ELEMENTS FROM THE TERMINAL BOARD, AND
WE RECOMMEND NOT TO DISABLE THEM (PAR.
1.3.1 and 1.4.1)
a
If any work must be carried out on hot cooling
equipment or on any other associated part, ad-
equate fire-safety equipment must be on hand.
Keep a dry powder or CO
to the charging area.
a
The ventilation should safely disperse the refrig-
erant released and preferably expel it towards
the outside.
a
The repair and maintenance of electrical com-
ponents should include initial safety checks and
component inspection procedures.
76 / EN
fire extinguisher close
2
a
If there is a fault that could jeopardise safety, do
not connect the power supply to the circuit un-
til the problem has been adequately resolved.
If the fault cannot be resolved immediately but
the device must nonetheless continue operat-
ing, adopt an adequate temporary solution. This
must be signalled to the owner of the equipment
so that all relevant parties can be notified.
a
Check that the gas detector is not a potential
source of ignition and that it is suitable for the
refrigerant used. The leak detection equipment
must be set to a percentage of the refrigerant's
LFL and must be calibrated on the basis of the
refrigerant used, confirming the appropriate gas
percentage (25% maximum).
a
The check must also take into account the effects
of ageing or the continuous vibrations generat-
ed by sources such as compressors or fans.
a
It is possible to use electronic leak detectors to
find refrigerant leakages, but if flammable re-
frigerants are used their sensitivity may be inad-
equate or may have to be recalibrated.
a
Fluids for detecting leaks are also suitable for
use with most refrigerants, however detergents
containing chlorine must be avoided, as chlorine
may react with the refrigerant and corrode the
copper pipes.
a
If a leak is suspected, all open flames must be
eliminated/extinguished.
a
If repairs (or any other intervention) must be car-
ried out in the refrigerant circuit, conventional
procedures must be used.
Service
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