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.
The burner output is determined by the delivery rate of the pellets via the pellet feed auger (on the pellet hopper). This is automatically
controlled by the burner control system. During commissioning the burner control parameters should have been checked and adjusted
as necessary by your Installer.
WARNING
Do not adjust or modify the appliance in any way as to do so could cause malfunction of the appliance, injury to persons or
death or result in a potential fire hazard.
Only an Grant trained installer, who has completed the Grant training course, should carry out any work on the appliance.
Once commissioned by a Grant trained installer, your Grant Spira boiler will operate automatically to provide heating and domestic hot
water (if you have a hot water cylinder fitted), as long as:
•
There are sufficient pellets of the correct type in the pellet hopper. Refer to Section 3.
•
The pellet auger is fully primed. Refer to Section 7.
•
The heating system controls are set to ON and ‘calling’, i.e. the programmer and room thermostat are on.
•
The burner ON/STANDBY switch on the boiler control panel is set to ON. Refer to Section 4.
If your appliance is controlled by a remote programmer and/or a room thermostat, it will provide heating and (when fitted) hot water
during the ON periods as set on the programmer, when either the room thermostat and/ or the hot water cylinder thermostat are
‘calling’.
WARNING
Always ensure the front access door of the combustion chamber is fully closed and latched during operation.
Certain external surfaces of the boiler will be hot to touch when in operation, due care is needed.
2.5 Cleaning
The burner incorporates a brazier, located within the boiler combustion chamber, where the combustion of the wood pellets takes
place. This brazier is fitted with a self-cleaning system to prevent a build-up of ash and clinker. This operates automatically after a pre-
set period has elapsed.
The boiler has two heat exchangers, the primary and secondary (condensing), and each is fitted with a self-cleaning system to keep the
heat exchanger tubes clear of ash build-up. As with the brazier cleaning system, these are operated automatically after a pre-set period
has elapsed.
CAUTION
Even with the automatic cleaning systems, it is vitally important that the boiler ash pan is regularly emptied and the boiler regularly
serviced. Refer to Sections 10 and 11 of these instructions for further information on the cleaning and servicing of your boiler.
3 About your Fuel
You Grant Spira boiler is designed to run only on 6mm diameter EN Plus Grade A1 wood pellets (conforming to EN14961-2).
Under no circumstances should any other form of biomass fuel be used with this boiler.
WARNING
ONLY EN Plus Grade A1 (EN14961-2) wood pellets MUST be used with your Grant Spira boiler. These pellets must be bark
and sand free AND previously tested by Grant BEFORE being used in your Spira boiler.
Failure to use pellets that meet the conditions above will invalidate the product guarantee. If you are in any doubt over
which pellets are suitable please contact Grant for assistance.
For your guidance, below are examples of both the correct grade of pellets to be used and poor quality pellets that must
not be used in your Grant Spira boiler.
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