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3.3. Loading the system
Once all boiler connections have been completed, CH system can be filled.
The procedure is to be cautiously carried out, following each step:
- open the air purging valves on all radiators and verify the boiler automatic valve operation;
- gradually open the relevant loading tap (pic. 2), checking all automatic air purging valves installed in the system properly work;
- close all radiator air purging valves as soon as water starts coming out;
- check boiler water pressure gauge not to exceed 1 / 1.3 bars reading;
- shut the loading tap and bleed any air out again, by opening the air bleeding valves on radiators;
- start the boiler and bring the system to working temperature, stop the boiler and wait for the pump to stop, then repeat the air bleeding proce-
dures;
- allow the system to cool and restore water pressure to 1 / 1.3 bars.
WARNING
As far as domestic heating systems treatment of water is concerned, in order to optimize performance and safety, to
preserve these conditions over time, to ensure long-lasting regular operation of auxiliary equipment as well, and to minimize
energy consumption, thereby integrating current local laws and standards it is advisable to use specific products that are suitable for
multi-metal plants.
WARNING
The safety low water pressure switch will not give electric consensus to the burner turn on procedure when water pressure is below
0,4/0,6 bar. CH water pressure is not to be less than 0,8/1 bar. Restore proper value as needed, via the loading tap which is provided as
standard with the boiler (pic. 2). The procedure is to be followed while the system is cold. The pressure gauge fitted on the boiler con-
trol panel indicates the pressure in the CH system.
3.4. Available head
The boiler is equipped with a high-efficiency circulation pump.
Circulation pump operating speed is set during production and cannot be changed.
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