Safety
Page 16
B0600008_US
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2.2
Permitted Uses
The boiler should only be operated when it is in full working order. It
should be operated in accordance with the instructions, observing safety
precautions, and you should ensure you are aware of the potential haz-
ards. Ensure that any faults, which might impair safety, are rectified
immediately.
The FHG is intended exclusively for heating up hydronic heating
systems or hydro-air systems. Use only the fuels specified below.
The manufacturer or supplier is not liable for any property dam-
ages resulting from non-permitted uses.
2.2.1
Permitted fuel
Burn Wood only, max. length 20’’ (50 cm)
Chemically treated or painted wood is unsuitable as fuel. The FHG boiler
is designed for burning of cord wood only. Wood briquettes or manufac-
tured pure wood logs can also be used as fuel provided they have a min-
imum cross section of 2.5 sq in (16 cm²). Manufactured logs should be
at least 12” (0.25 m) in length. The Fuel Loading Chamber can be filled
to the top. Excessively small and compact pieces of wood or wood pel-
lets are not suitable. Coal cannot be used as it destroys the combustion
chamber!
The FHG is made to burn natural forest wood. Both hardwood and soft-
wood are suitable, but oak should not be burned as the only source of
wood for long periods because of its high acid content.
For effective gasification, the wood must be dry, i.e. moisture content
15-25%. In addition to increasing the likelihood of generating creosote
in the boiler, burning wet wood uses a substantial amount of the wood
energy to evaporate the water present in the wood, reducing the availa-
ble energy for heat (Fig 2.2).
