Pellet Specification,
Storage & Delivery
14
3 Pellet Specification, Storage & Delivery
3.2 Pellet Storage
3.2.1 Pellet Hoppers & Pellet
Feed Auger
All Grant SPIRA boilers are supplied
with a pellet hopper. Refer to Section
1.4.4 for further details of the hoppers.
All Grant hoppers are supplied with
either one or, on a double boiler hopper,
two 1.2 m pellet feed augers, to deliver
the pellets from the hopper to the
boiler. Refer to Section 1.4.5.
The pellet hopper, along with the boiler
(or boilers) it is supplying, MUST be
installed in a dry indoor environment
free from dampness. The hopper and
boiler(s) must be located on the same
floor level.
If a bulk hopper is to be used, there are
two methods of transferring the pellets
from the bulk store to the intermediate
hopper:
a) Via a bulk pellet feed auger
b) Via the Grant SPIRA-VAC vacuum
pellet feed system
All boiler pellet hoppers are supplied to
accept either of these two pellet supply
systems, as required. Refer to Section
1.4.4 for further details on the hoppers.
The electrical connections to the
boiler(s) are all made to the 4-way
electrical plug on one of the three
factory-fitted ‘flying leads’ at the rear of
the hopper. Refer to Section 7 for
details.
Electrical connection for either a bulk
auger or Grant SPIRA-VAC system, if
required, is made using the 6-way
electrical plug and flying lead supplied
factory-fitted on the hopper.
3.2.2 Bulk Hopper
It is advisable to fit a bulk pellet store to
take advantage of the lower cost of
pellets purchased in bulk.
The pellet hopper must still be used,
situated between the bulk hopper and
the boiler, as the auger fitted to the
hopper delivers the precise quantity of
pellets required by the burner.
The pellet hopper also allows any
problems with bulk pellet quality to be
isolated and the intermediate hopper
can be used temporarily as the source
of pellets for the boiler.
It is essential to only use a bulk storage
unit that is:
a) Waterproof
b) Specifically designed to store wood
pellets
c) Supplied with appropriate
connections for pellet delivery,
which are within the drivers reach
d) Fitted with a vent connection (for
dust extraction) during filling
e) Permanently vented (if located
outside) or unvented (if installed
indoors)
f) Fitted with a rubber arrester mat
(or similar) to limit pellet damage
during filling
g) Is electrically earthed
A range of suitable bulk pellet stores
are available from Grant UK. These are
supplied flat packed for on-site
assembly. Refer to assemble
instructions supplied with each kit. For
details of capacities and dimensions
contact Grant UK.
The use of a self constructed wood
pellet storage facility should be pre-
approved by the fuel supplier before
any pellets are delivered and must meet
relevant building and fire regulations.
The ONORM M7137 standard should
be used as a guideline for DIY bulk
storage units.
A storage unit should not be positioned
where it would result in a fire risk.
The store should be located on a
suitable base (e.g. concrete) capable of
supporting the weight of the store when
full of pellets.
Figure 3-1: Bulk auger inlet in hopper
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