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B) Minimum heat output adjustment
- Disconnect electric wiring from D modulation coil (pic. 20);
- turn the burner on and check minimum pressure value according to no. 2 and no. 3 charts on page 14;
- in order to adjust pressure, hold nut B still by means of a 100 mm tool, and turn plastic screw C CLOCKWISE to increase and
COUNTER-CLOCKWISE to decrease gas pressure;
- re-connect electric wiring to modulation coil.
C) Final settings
- Turn the boiler on and check its correct operation;
- check again for correct minimum and maximum gas valve pressure of gas valve;
- adjust as necessary;
- install protective plastic cap A;
- close gas pressure checks;
- check for gas leaks.
4. TESTING THE BOILER
4.1 Preliminary checks
Before testing the boiler, it is recommended to carry out the following checks:
- flue gas evacuation ducts and terminal are implemented according to instruction:
when the boiler is running
products generated by combustion are not to leak from gaskets;
- power mains supply to boiler is 230 V – 50 Hz;
- the system is correctly loaded (water pressure on gauge 1 / 1,3 bars);
- all stopcocks in the system piping are open;
- the gas type supplied to the boiler is in compliance with boiler specifications In contrast, modify the boiler for the gas type available
(see no. 3.6 section “ADAPTATION TO OTHER GAS TYPES AND BURNER ADJUSTMENT”);
- the gas supply stopcock is open;
- no gas leaks are detected;
- the power switch, external to the boiler, is on;
- the boiler 3 bar safety valve is not blocked;
- the boiler pump is not blocked.
Should the boiler not be installed in compliance with current laws and standards, notify the system supervisor
and do not test the boiler.
4.2. Switching on and switching off
For boiler starting up and switching off procedure follow the “Instructions for the User”.
