28
3-3
4
3
2
1
5
6
INS
TALLER
US
ER
MAINTEN
AN
CE TECHNI
CI
AN
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
SIT 845 GAS Valve
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 company (e.g. Author-
ised After-Sales Assistance). Burner adjustment
must be carried out using a differential "U" or
digital type pressure gauge connected to the
pressure socket located above the sealed cham-
ber (part. 9 Fig. 1-29) 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).
- With the brass nut (3 Fig. 3-3) adjust the
boiler nominal output, observing the maxi-
mum 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
nominal pressure.
- Set the power at minimum (0%) still using
the “CH regulator” selector (1).
- Adjust the minimum thermal input by op-
erating 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).
• Adjustment (any) of the boiler maximum heat
output in central 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 heat-
ing phase, must not be carried out in refer-
ence 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.
3.6 CONVERTING THE BOILER TO
OTHER TYPES OF GAS.
If the boiler has to be converted to a different
gas type to that specified on the data nameplate,
request the relative conversion kit for quick and
easy conversion.
The gas conversion operation must be carried
out by an authorised company (e.g. Authorised
Technical After-Sales Service).
To convert to another type of gas the following
operations are required:
- disconnect 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;
- re-power the appliance;
- from the push button panel on the boiler, select
the type of gas (S2) and then select (
Ng
) if it
runs on Methane or (
Lg
) if it runs on LPG;
- adjust the boiler nominal heat output;
- adjust the minimum heat power of the boiler;
- adjust the boiler nominal heat output in heating
phase;
- adjust (eventually) the maximum heating
power;
- seal the gas flow rate regulation devices (if set-
tings are modified);
- after completing the conversion, apply the
sticker, contained in the conversion kit, near
the data nameplate. Using an indelible marker
pen, delete 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).
STD.002998/004
Summary of Contents for MAIOR EOLO 24
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