34
www.eta.co.at
General information
Pellet store
6
Pellet store
6.1
General information
Delivery of pellets
The pellets are delivered by a tank truck and blown into
the storage room. The tank trucks usually have a pump
hose with a length of up to 20 m. If you expect to need
a longer pump hose, ask about your pellet supplier's
technical capabilities.
Vehicle access should be at least 3 m wide and 4 m
high. The truck can only back up if the street and gate
are wide enough.
1
Pellet store
2
Boiler room
3
Filling hoses from tank truck
Correct placement of the pellet store
Placement of the storeroom is crucial for satisfactory
operation. For this reason, do not place the pellet store
underneath or in the immediate vicinity of bedrooms.
Because the noises that occur during operation could
be transferred into these rooms.
Position of pellet store and boiler room
If possible, the pellet store should adjoin an outer wall
since the filling nozzle should be accessible from
outside. For an interior pellet store, the blower and
back air pipes should be extended to the outer wall.
The boiler room should adjoin an outer wall to ensure
direct supply of combustion air to the pellet boiler. For
an interior boiler room, an air supply duct must lead
from the boiler room to the outer wall.
If the pellet store is located above the boiler (e.g.,
heating boilers in the basement and the pellet
store on the ground floor or attic) condensation can
occur in the pellet hoses.
To prevent this, a check valve can be installed in the
pellet hose of the return air line (from the boiler to the
pellet store). This prevents air circulation from the
lower boiler to the pellet store.
Testing before initial fill-up
Before filling the pellet store, test the functionality
of the entire heating system and the pellet
conveying system. For this purpose, deposit some
pellets (bagged product) in the storage room near the
discharge conveyor.
Only fill up the pellet store after this test has been
completed successfully.
Burn-back protection also when filling
The authorities or the chimney sweep often require
that a notice saying "CAUTION! Switch off boiler
before filling" must be affixed, easily visible, to the
filling nozzle covers. Burn-back flaps and sliders at the
boiler's combustion chamber are open during
operation, so during boiler operation, hot gases can be
sucked into the path of the pellets (due to negative-
pressure in the fuel deposit) or air can be blown
through the fuel path (due to overpressure in the fuel
deposit). Both effects can cause a fire. Strictly
speaking, the boiler should already be switched off two
hours before filling the pellet store, because the burn-
back flaps and sliders do not always close completely.
So there should be no more fire in the boiler when
filling pellets.
Since we at ETA don't want to leave the burn-
back protection of our boilers to chance, we equip
all ETA pellet boilers with a rotary valve so that even
during operation there is no open connection between
the combustion chamber and the pellet store. Though
it is not required that an ETA pellet boiler be switched
off while filling the pellet store, you should do so
anyway if the driver of the delivery truck requests it.
Dust-tight doors to pellet store
Doors and other openings must open outward and be
furnished with a circumferential dust-tight seal. For
doors or other openings to the pellet store, wooden
