for the technician
Changing Gas type
ATTENTION: the operations described below must be carried out only by qualified
personnel [authorized from HERMANN Ltd].
For gas conversion, use the nozzles supplied by boiler manufacturer only.
Using LPG, it is absolutely necessary to install a pressure reducer upstream the boiler.
1. Disconnect the boiler from the electrical supply.
2. Remove the cover of the control panel and move the
first microswitch of SW3 (on the right) in the position
suitable for the gas available:
MET (OFF) for Natural Gas (G20),
GPL (ON) for Butane (G30) or Propane (G31)
3. Check that pressure and gas input are enough to
guarantee the correct functioning of the appliance.
4. On “SE” models, open sealed combustion chamber.
5. Remove pipe between gas valve and injectors bar.
6. Remove injectors bar and replace the nozzles with the
ones suitable for the available gas type, using a 7 mm.
spanner (see figure “BURNER”). Reassemble injectors
bar and pipe, replacing gaskets. Check, with burner ON,
that there are no gas leaks. On “SE” models, close sealed
combustion chamber;
7. Check, with burner ON, that there are no gas leaks and
that the pressure upstream the boiler is:
Natural gas: min.17 – max. 25 mbar
Buthane: min. 25 – max 35 mbar
Propane: min. 25 – max 37 mbar
8. Repeat the following regulations: gas valve MAX-MIN pressure regulation, Slow Opening and
Max Heating Output, carefully following the instructions described in the previous pages.
9. Check that there are no gas leaks.
10. apply the sticker indicating the type of gas (supplied with the kit) on the suitable area on “WARN-
ING” label inside the boiler.
BURNER
LEDOM
rebmuN
selzzonfo
rofØselzzoN
02GSAGLARUTAN
)mm001/1(
rofØselzzoN
13G/03G.G.P.L
)mm001/1(
E32ARCIMREPUS3102157
E82ARCIMREPUS4152167
ES42ARCIMREPUS3102157
ES03ARCIMREPUS4103187
1
SW3
ON
MET
GPL
853R00
51
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