3
1 Introduction
This guide is intended to assist and instruct
the user in the operation of the Grant Spira
Condensing Wood Pellet Boiler.
A separate manual is available to the
installer for the installation, servicing and
commissioning of the boiler.
The following special text formats are used in
this manual for the purposes listed below:
WARNING
Warning of possible human injury as a
consequence of not following the instructions
in the ‘Warning’.
CAUTION
Caution concerning likely damage to
equipment or tools as a consequence of not
following the instructions in the ‘Caution’.
NOTE
Note text. Used for emphasis or information
not directly concerned with the surrounding
text but of importance to the reader.
2 About your
Boiler
2.1 General
Your Grant Spira wood pellet boiler should
only be installed, commissioned and
serviced by a Grant Accredited Installer who
has undergone specific product training by
Grant Engineering (UK) Ltd.
If you have a Grant Spira 6-26 or 9-36, your
boiler basically consists of two parts:
•
The boiler itself, with the burner mounted
on the front
•
The pellet hopper, with the pellet feed
auger protruding from the front of the
hopper casing
The hopper may be either a 110kg or 200kg
capacity unit and will be located on either the
left or right hand side of the boiler.
Check with your installer for the actual
capacity of pellet hopper you have with your
boiler.
Alternatively, if you have a Grant Spira 12-52,
15-62 or 18-72, your boiler will basically
consist of three parts:
•
Two boilers, each with the burner
mounted on the front
•
The pellet hopper, with two pellet feed
augers protruding from the front of the
hopper casing
In this case the hopper will have a 140kg
capacity and will be located between the two
boilers.
CAUTION
All Grant Spira boilers and pellet hoppers are
designed for indoor use only and MUST be
positioned in a dry environment.
2.2 Pellet Hoppers
The pellet hopper is mounted on castors (with
the front castors lockable) to allow it to be
easily moved when required. Allow sufficient
area in front of the hopper for it to be moved
out and away from the boiler(s) for servicing.
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 pellet hopper.
All Grant pellet hoppers are fitted with a
contents switch. Refer to Figure 2-1.
This automatically detects when the level
of pellets in the hopper falls to a pre-set
minimum value.
The minimum quantity of pellets required
to restart the boiler is 20kg for the single
boiler hoppers and 30kg for the double boiler
hoppers.
If you have a bulk pellet store (refer to Section
2.3), the contents switch automatically
triggers the operation of either the bulk store
auger or Grant SpiraVAC system, whichever
is fitted, to deliver pellets from the bulk pellet
store into the pellet hopper beside the boiler.
Figure 2-1: Contents switch in the base of the
pellet hopper
When there is no bulk store (but the pellet
hopper only), the contents switch stops the
burner operating when the minimum pellet
level is reached. In this case, topping up the
hopper with more pellets will automatically
operate the contents switch and the burner
will restart, as long as there is a demand from
the heating controls (room thermostat, etc.)
for the boiler to run.
CAUTION
Always ensure that the door on the top of
the pellet hopper is closed after filling to
ensure no foreign debris enters the hopper.
The hopper should only be filled to the point
where it is still possible to close the top door.
2.3 Bulk Pellet Stores
You may also have a bulk pellet store,
located either inside or outside the building. If
so, check with you installer for the capacity of
the bulk pellet store.
If you have a bulk pellet store you will have
either a bulk store auger, or a Grant SpiraVAC
vacuum system, to move the pellets from the
bulk store to the pellet hopper as and when
required. Check with your installer regarding
which system you have fitted. If you have the
Grant SpiraVAC system, please refer to the
instructions provided with that system for
details of its operation.
NOTE
If you have a bulk pellet store it is essential
that you routinely check the level of pellets in
the store and arrange for a delivery of pellets
before the store is empty.
Where a bulk store is fitted; if the bulk store
and pellet hopper are both allowed to run out
of pellets then the error message ‘FAILED
PELLET LIGHTING’ will be displayed on the
burner control panel screen. Once the bulk
store has been refilled with pellets, the bulk
store auger (if fitted) will need to be re-primed
before the pellet hopper is automatically filled
from the bulk store.
If a Grant SpiraVAC vacuum system is fitted
refer to the Instructions supplied with the
system to restart the pellet supply to the
pellet hopper.
Once the pellet hopper is filled, the pellet
hopper auger will also need to be re-primed.
Refer to Section 7 of these instructions.
Once this has been done press the reset
button on the burner control panel to cancel
the error message and restart the boiler.
2.4 Boiler Operation
During the combustion process, hydrogen
and oxygen combine to produce heat and
water vapour. The water vapour produced
is in the form of superheated steam that
contains heat that is locked up in the flue
gases. A conventional boiler cannot recover
any of this heat and this energy is lost to the
atmosphere through the flue.
Your Grant Spira condensing wood pellet
boiler contains an extra (secondary) heat
exchanger which is designed to recover
much of the heat normally lost by a
conventional boiler through the flue system.
It does this by cooling the flue gases and
extracting more heat from them, pre-heating
the cooler water returning to the boiler from
your heating system.
Even when not operating in a condensing
mode, this additional heat exchanger ensures
that your Grant Spira boiler will still operate at
an extremely high efficiency.
