Converting The Boiler To Other Types Of Gas; Checks Following Conversion To Another Type Of Gas; Possible Adjustments - Immergas Maior Eolo 24 4E Installation Manual

SIT 845 GAS Valve
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3.6 CONVERTING THE BOILER TO
OTHER TYPES OF GAS.
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If the boiler has to be converted to a different gas
type to that specified on the data plate, request
the relative conversion kit for quick and easy
conversion.
Boiler conversion must be carried out by a
qualified technician (e.g. Immergas After-Sales
Technical Assistance Service).
To convert to another type of gas the following
operations are required:
- remove the voltage from the appliance;
- replace the main burner injectors, making sure
to insert the special seal rings supplied in the
kit, between the gas manifold and the injectors;
- apply voltage to the appliance;
- use the boiler push button control panel to
select the gas parameter type (S2) and select
(Ng) in case of Methane supply or (Lg) in the
case of LPG;
- adjust the boiler nominal heat output;
- adjust the boiler minimum heat power;
- adjust the boiler nominal heat output in heating
phase;
- adjust (eventually) the maximum heating
power;
- seal the gas flow rate regulation devices (if
settings are modified);
- after completing conversion, apply the sticker,
present in the conversion kit, near to the data-
plate. Using an indelible marker pen, cancel the
data relative to the old type of gas.
These adjustments must be made with reference
to the type of gas used, following that given in
the table (par. 3.18).
3.7 CHECKS FOLLOWING
CONVERSION TO ANOTHER TYPE
OF GAS.
After making sure that conversion was carried
out with a nozzle of suitable diameter for the
type of gas used and the settings are made at the
correct pressure, check that:
- there is no flame in the combustion chamber
- the burner flame is not too high or low and that
it is stable (does not detach from burner)
- the pressure testers used for calibration are
perfectly closed and there are no leaks from
the gas circuit.
N.B.: all boiler adjustment operations must
be carried out by a qualified technician (e.g.
Immergas After-Sales Technical Assistance).
164
Burner adjustment must be carried out using a
differential "U" or digital type pressure gauge lo-
cated above the sealed chamber (part. 9 Fig. 1-34)
and the gas valve pressure outlet (part. 4 Fig. 3-3),
keeping to the pressure value given in the table
(Par. 3.18) according to the type of gas for which
the boiler is prepared.

3.8 POSSIBLE ADJUSTMENTS

N.B.: to adjust the gas valve, remove the plastic
cap (6); after adjusting, refit the cap.
• Preliminary calibration operations.
- Set parameter S0 at 0 %.
- Set parameter S1 at 99 %.
• Activate the chimney sweep function.
- Enter the "DHW chimney sweep" mode,
opening a DHW cock.
• Adjustment of boiler nominal thermal heat
output.
- Set the power at maximum (99%) by turning
the "CH regulator" selector (1).
- Adjust the boiler nominal power on the brass
nut (3 Fig. 3.3), keeping to the maximum
pressure values stated in the tables (Par. 3.18)
according to the type of gas; by turning
clockwise the heat potential increases, anti-
clockwise it decreases.
• Adjustment of boiler minimum thermal heat
output.
N.B.: only proceed after having calibrated the
minimum boiler pressure.
- Set the power at minimum (0%) still using
the "CH regulator" selector (1).
- Adjust the minimum thermal input by ope-
rating on the cross plastic screws (2) on the
gas valve maintaining the brass nut blocked
(3);
• Exit the "Chimney sweep" mode and keep the
boiler functioning.
• Adjustment of the boiler minimum heat output
in heating phase.
N.B.: only proceed after having calibrated the
minimum boiler pressure.
- To adjust the minimum heat output during
the heating phase, change parameter (S0),
increasing the value the pressure increases,
reducing it the pressure drops.
- The pressure to which the boiler minimum
heat output must be adjusted, must not be
lower than that stated in the tables (Par. 3.18).
Key:
1 - Coil
2 - Minimum power adjustment screw
3 - Maximum power adjustment nut
4 - Gas valve outlet pressure point
5 - Gas valve inlet pressure point
6 - Protection hood
• Adjustment (any) of the boiler maximum heat
output in heating phase.
- To adjust the maximum heat output during
the heating phase, change parameter (S1),
increasing the value the pressure increases,
reducing it the pressure drops.
- The pressure to which the boiler maximum
heat output must be adjusted in central
heating phase, must not be carried out in re-
ference to that stated in the tables (Par. 3.18).
3.9 SLOW AUTOMATIC IGNITION
FUNCTION.
In ignition phase, the P.C.B. supplies constant
gas with pressure proportional to the parameter
"S4" set.
Fig. 3-3