3.2.12. Installation of original kits
The manufacturer provides original kits for thermoregulation con-
trol unit installation.
The kits are to be installed as described in their relevant instruction
manuals.
3.3. Loading the system
After completion of all hydraulic connections the central heating
system is ready for loading.
Water filling procedure must be performed as follows:
- open air purging valves on the radiators and check operation of
the boiler automatic air purging valve
- gradually open the boiler water main inlet tap and check operation
of all air purging valves in the system
- close the air purging valves on the radiators as soon as water
comes out
- check the water pressure gauge on boiler, its reading is not to
exceed 1-1.3 bars
- close the water main inlet tap and purge any air still in the system
through the radiator valves
- turn the boiler on and wait for the CH system to reach working
temperature. Stop the pump and purge any left air
- allow the CH system to cool and adjust water pressure to 1-1.3
bars.
WARNING
For best performance, safe, trouble-free and long lasting opera-
tion of boiler and its components, in order to minimise energy con-
sumption, thus complying with standards and laws, it is essential to
treat the water using specific products compatible with multi-metal
systems.
Note
The boiler is equipped, in its front lower section, with a tap for
unloading water from the system.
WARNING
A low water pressure safety switch prevents burner to ignite when
water pressure is lower than 0.4 / 0.6 bar. Water pressure in the
central heating system should not be lower than 1-1.3 bar; resto-
re correct pressure through water mains inlet tap on the boiler as
necessary.
Water pressure adjustment must be performed when the system
is cold. The thermo-manometer gauge on the boiler allows for che-
cking the pressure in the system.
IMPORTANT:
After a period of inactivity the pumps could be blocked.
Before switching on the boiler it may be necessary to unlock
the pumps as follows: loosen the protective screw on the
pump motor housing, insert a screwdriver in the hole and then
manually rotate the pump shaft clockwise.
After restoring pump operation, tighten the protective screw
and check for water leaks.
WARNING
When removing the pump protective screw a little water may
leak out. Before replacing the cover of the boiler dry any wet
surfaces.
3.4 Starting the boiler
3.4.1 Preliminary checks
Prior to starting the boiler verify the following:
- correct installation of flue gas outlet duct and terminal section:
when the boiler is operating, no flue gas leaks are to be
detected.
- power supply to the boiler must be 230 V- 50 Hz;
- system is correctly filled with water (manometer reading is to be
1-1.3 bars);
- any cut-off taps in the system are to be open;
- the gas type supplied matches the gas type for which the boiler
has been calibrated: otherwise, convert the boiler to the gas type
available (see section 3.6: “SWITCHING TO DIFFERENT GAS
AND BURNER ADJUSTMENT“): this operation is to be performed
by qualified technicians;
- the gas supply tap is open;
- no gas leaks are detected;
- the power switch external to the boiler is on;
- no water leaks are detected
- the pumps are not blocked
- the boiler’s safety valve is not locked;
WARNING
The boiler pump is factory set to III speed and the by-pass is closed.
Adjust them following the system requirements.
3.4.2 On/Off switching
To switch the boiler on and off follow the indications in the “In-
structions to the user”.
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