52
3.3.
filling 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 filler cock (fig. 2), checking any automatic bleeding 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 filler cock 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 pump, and repeat air bleeding procedure;
- allow the system to cool and restore water pressure to 1÷1.3 bars.
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as for water treating in the domestic heating systems in order to optimise efficiency and safety, ensure a long life, trouble-free operation
of auxiliary equipment, minimise power consumption, thereby integrating the standards and rules in force in the country of installation, it
is recommended to use specific products suitable for multi-metal heating systems (see paragraph 3.2.4.).
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Pressure sensor will not electrically enable the burner ignition when water pressure is below 0.4 bar (this parameter can be edited by
qualified professional staff).
CH water pressure must not to be less than 1 bar. Restore proper value as needed, via the filler cock of the boiler (fig. 2).
The procedure is to be followed while the system is cold. Digital pressure gauge is used to read pressure inside the heating circuit.
3.4.
Starting up the boiler
3.4.1.
Preliminary checks
Before starting the boiler, check that:
- the flue gas venting duct and the relevant terminal are installed in conformity with the instructions: with the boiler operating, there must be no
leakage of combustion by-products from any of the gaskets;
- the supply power to the boiler must be 230 V – 50 Hz;
- the system is correctly filled with water (pressure gauge reading 1 to 1.3 bar);
- any shut-off cocks in the system pipes are open;
- the mains gas type is correct for the boiler calibration: convert the boiler to the available gas if necessary (see section 3.7.
Adaptation to other gas
types and burner adjustment
): have this operation carried out by qualified technical personnel;
- the gas supply cock is open;
- there are no fuel gas leaks;
- the main switch installed ahead of the boiler is turned on;
- the 3-bar safety valve is not stuck;
- there are no water leaks;
- the pump has not seized.
- the condensate trap installed on the boiler is discharging condensate correctly and is not stuck.
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The boiler is equipped with a modulating circulation pump; figures 17 and 18 show the different residual head values.
If you wish to set a different speed, taking into account the water circulation requirements in the boiler and the resistance properties of
the system, check operation of the boiler in all the conditions dictated by the features of the system (e.g. closure of one or more heating
zones or of thermostat-controlled valves).
3.4.2.
Switching on and switching off
To switch the boiler on and off, refer to the "
Instructions for the User
”.
