Conversion To Different Type Of Gas; Gas/Air Regulation - Rotex GW-20 H12 Instrucciones De Instalación

7.7

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.
7.8

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
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.
Gas type
Gas category
CO % on Low setting (L) ( and
2
With open cover
CO % at High setting (H) ( and
2
With open cover
Initial gas pressure (mbar)
Gas dosing ring
RHOB12AAV1H
RHOB18AAV1H
RHOB42AAV1H
CAUTION
CO check must be carried out with open cover. If the cover is
2
shut, the CO % may be higher than the values stated in the above
2
table.
percentage in the combustion gases or by
2
Natural gas
2E/H G20
)
2x)
20 mbar
Natural gas
460
600
655
Propane
3P / G31
See par. 7.8
See par. 7.8
30/37/50 mbar
Propane
315
480
525
42