18
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1. INSTALLATION
INST
ALLER
1.1.10. SYSTEM FILLING
WARNING
For system filling use only clean tap
water. In order to prevent limestone build-up and
damages to the domestic water heat exchanger,
the hardness of the domestic supply water
should not exceed 15° Fr. However, please check
the characteristics of the water used and install
suitable treating devices.
WARNING
If the system is filled by adding ethylene
glycol-type chemical agents you have to install on
the loading system a hydraulic trip unit in order
to separate the heating circuit from the domestic
circuit.
Before powering up the boiler, fill the system as
follows:
1. slightly loosen the cap of the jolly valve placed
on the top of the condensing block to release
the air form the top of the system
(1-fig.1);
2. check that the jolly valves vent the air present
in the system are not blocked;
3. connect a rubber pipe to the draining tap placed
on top of the condensing heat exchanger (2-
fig.1);
4. open the general domestic water input tap and
load the system by exhaling all the air;
5. use pressure gauge present in the system to
make sure that the system pressure reaches
the design value;
6. after performing this operation, make sure
that the loading tap is properly closed.
7. Open the air relief valves of the radiators and
check the air removal process. When the
water starts to leak close the radiators air
relief valves.
8. If after performing these operations you
observe a decrease of the water pressure
inside the system, open once again the loading
tap until the pressure gauge reaches the
design pressure.
2
1
fig. 1
