41
7.6
Conversion to different type of gas
CAUTION
Work on gas carrying parts may only be carried out by
a certified installer.
If a unit is connected to a different type of gas than the one it has been set to by the
manufacturer, the gas dosing ring must be replaced. Conversion sets for other types of gas are
available to order.
Converting the dosing ring
1.
Switch off the boiler and remove the plug from the socket.
2.
Shut the gas valve.
3.
Remove the front panel from the unit.
4.
Loosen the coupling (A) above the gas block and turn the gas mixing tube (B) backwards.
5.
Replace the O-ring (C) and the gas dosing ring (D) by the rings in the conversion set.
6.
Reassemble it in reverse order.
7.
Open the gas valve.
8.
Check whether the gas couplings before the gas block are sealed.
9.
Enter the plug in the socket and switch on the boiler.
10.
Check whether the gas couplings after the gas block are sealed (during operation).
11.
Now check the setting of the gas/air ratio (see par. 0).
12.
Put a sticker of the configured gas type on top of the existing sticker at the gas block.
13.
Put a sticker of the configured gas type at the type plate.
14.
Return the front panel onto the unit.
7.7
Gas/air regulation
The gas/air regulation has been set at the factory and does not require any adjustments, in
principle.
The setting can be checked by measuring the CO
2
percentage in the combustion gases or by
measuring the pressure difference.
In case of any disturbance, replacement of the gas block or conversion to a different type of
gas, the regulation must be checked and set in accordance with the following table.
CAUTION
CO
2
check must be carried out with open cover. If the cover is
shut, the CO
2
% may be higher than the values stated in the above
table.
Gas type
Natural gas H
Propane P
Gas category
2E/H G20
3P / G31
30 / 37 / 50
CO
2
% on Low setting (L)
(
and
)
With open cover
See par. 7.8
CO
2
% at High setting (H)
(
and
2x
)
With open cover
See par. 7.8
Initial gas pressure (mbar)
20
50
Gas dosing ring
Natural gas H
Propane P
RHOBG12AAV1
460
315
RHOBG18AAV1
505
410
Summary of Contents for Rotex GW-30 H12
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