Grant WPVKIT5 Assembly Instructions

1
Grant SpiraVac Pellet Feed System
For Grant Spira Boiler Pellet Hoppers
Installation & User Instructions
Part No. DOC.43 Rev.07 – 17/05/17

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EC Declaration of Conformity
In accordance with BS EN ISO/IEC 17050-1:2004
We
Grant Engineering (IRL)
Of
Crinkle
Birr
Co. Offaly
Ireland
Telephone:
057 912 0089
Fax:
057 912 1060
Email:
[e-mail]
Website:
www.grantengineering.ie
Declare that
Equipment:
Wood Pellet Vacuum System for Domestic Wood Pellet Boilers
Model Name/Number:
Grant BioVac System
In accordance with the following EC Directives:
2006/42/EC Conforms with the requirements of the Machinery Directive.
2006/95/EC Conforms with the safety objectives of the Low Voltage Directive and its
amending Directives
2004/108/EC Conforms with the essential protection requirements of the
Electromagnetic Compatibility Directive and its amending Directives
Has been designed and manufactured to the following Specifications:
EN60335-1:2012 Household and similar electrical appliances. Safety – General
requirements.
EN60335-2-2:2010 Household and similar electrical appliances. Safety. Particular
requirements for vacuum cleaners and water suction cleaning
appliances.
EN55014-1:2006 Electromagnetic Compatibility. Requirements for household appliances.
MCS008 Product Certification scheme requirements - Biomass
Important Note for Installers
After installing the Grant SpiraVac system leave these Installation Instructions with the appliance. Also
leave the Spira Installation and Servicing Instructions and the Spira User Instructions with the
householder.
This appliance is deemed a controlled service and specific regional statutory requirements may be
applicable.

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Contents
Page
1.
Introduction
4
2.
Technical Specification
2.1 Kit contents 5
2.2 Technical data 6
2.3 System arrangement 6
3.
Description & Operation
3.1 Vacuum unit 7
3.2 Auger unit 8
3.3 Flexible tubes 9
3.4 Operating sequences 9
4.
Installation
4.1 Auger unit 13
4.2 Vacuum unit 15
4.3 Flexible pellet tubes 17
5.
Electrical
5.1 General 19
5.2 Connection of pellet hopper 19
5.3 Connection of vacuum unit to pellet hopper 19
5.4 Connection of vacuum unit to auger unit 20
5.5 Wiring diagrams 21
6.
Commissioning
6.1 General 26
6.2 Procedure 26
7.
Servicing
7.1 Vacuum unit 28
7.2 Auger unit 29
7.3 Pellet tubes 29
8.
User Instructions
8.1 Introduction 30
8.2 About the Spira-Vac system 30
8.3 Controls 30
8.4 Starting the system 31
8.5 ‘Night time’ operation 31
8.6 Manual operation 32
9. Guarantee
33

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1. Introduction
These Installation instructions should be read carefully before installing the SpiraVac system and must be
used in conjunction with the Grant Spira Installation & User instructions supplied with the boiler.
Installation of the Grant Spira boiler and Grant SpiraVac system must only be carried out by a Grant
Approved Installer who has successfully completed the Grant Spira training course.
The Grant SpiraVac is a vacuum system for conveying wood pellets from a bulk store to the pellet hopper
located adjacent to the Grant Spira boiler. It is designed specifically for use with the Grant Spira wood
pellet boilers and should not be used with other wood pellet burning appliances. It is intended to convey
6mm diameter EN Plus A1 (BS EN ISO17225-2:2014) wood pellets only and should not be used for any
other application.
Grant Engineering UK Ltd shall not be liable for any injury or damage arising from the incorrect use of this
system. For correct usage, refer to these Installation and User instructions.
Installation of the Grant Spira wood pellet boiler, and the SpiraVac system, must be carried out by a
competent person in accordance with all current legislation, codes of practice and local by-laws relating
to the installation of solid fuel burning appliances.
The electrical installation must comply with the requirements of the Electricity at Work Regulations 1989
and BS7671:2008 - IET Wiring Regulations 17th Edition (including all amendments).
All installations of Grant Spira wood pellet boilers must comply with the relevant Building Regulations.

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2. Technical Specification
2.1 Kit Contents
The Grant SpiraVac system is available in 4 different kits, containing the following:
•1 x Auger unit
•1 x Vacuum unit
•1 x Pellet dam plate
•4 x ‘Jubilee’ type pipe clips
•Flexible pellet tube (length dependant on kit – see table below)
•Metal pipe clips (quantity to suit tube length used – see table below)
•Installation & User Instructions
Note. The electrical cable required to connect the auger unit to the vacuum unit to be supplied by
installer.
SpiraVac Kit
Ref No.
Length of flexible tube (between
auger unit and vacuum unit)
Number and lengths of
tube supplied
Quantity of metal
pipe support clips
WPVKIT5
5m
1 x 10m length
10
WPVKIT10
10m
2 x 10m length
20
WPVKIT15
15m
2 x 15m length
30
WPVKIT20
20m
2 x 20m length
40
ALL THREE
Figure 2-1.
Auger unit
Figure 2-2.
Vacuum unit
Figure 2-3.
Flexible pellet tube
Figure 2-4.
Pellet dam plate

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2.2 Technical Data
Auger unit
Vacuum unit
Weight 16.4kg 24kg
Supply Voltage
230V 50HZ 1ph 13A fused*
Running Current
8.6A
Power
1870W
*Refer to Section 5.2 for further details on fuse ratings required
2.3 SpiraVac System Arrangement
Spira pellet boiler
Bulk pellet store
Auger unit
Flexible pellet tubes
Vacuum unit
Boiler pellet hopper

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3. Description & Operation
The Grant SpiraVac pellet feed system consists of the following items
3.1 Vacuum Unit
The vacuum unit is designed to be mounted on the top of either the single or double Spira pellet hopper.
The pellet hopper, supplied with the boiler, has a removable cover on the top rear panel to allow fitting of
the vacuum unit. Refer to Section 4 for vacuum unit installation details.
The vacuum unit can be fixed to the top rear panel of the pellet hopper to face in any one of three
directions; with the control panel facing forwards, to the right or to the left.
Figure 3-1.
Front view of vacuum unit
Figure 3-2.
Rear view of vacuum unit
The vacuum unit contains a vacuum motor that pulls air through the cyclone.Air to cool the vacuum
motor is drawn in through a vent in the top of the enclosure and exhausted through an opening in the
rear. Refer to Figures 3-1 and 3-2.
IMPORTANT: Ensure that the cooling vents on the top and at the rear of the vacuum unit are not
obstructed at any time.
The cyclone section of the vacuum unit is located below the enclosure (located within the top part of the
pellet hopper when fitted). It is fitted with a counterbalanced trap door at the bottom. This door is drawn
closed by the vacuum generated when the motor is running. When the motor stops, and the vacuum
ceases, the weight of the pellets collected in the cyclone pushes the door open and the pellets are
deposited into the hopper.
The unit also incorporates a vacuum switch, that is operated by the vacuum produced by the vacuum
motor in order for the auger unit (located on the bulk pellet store) to run. Thus the auger motor can only
run when the vacuum motor is operating.
The vacuum unit is lined with acoustic insulation to reduce the noise level.
Two steel connection spigots are provided, on the rear face of the unit, for connection of the vacuum
system flexible tubes. Refer to Figure 3-2.

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The vacuum unit has two factory-fitted flying leads with pre-wired plugs.
•The 6-way plug connects the vacuum unit to the pellet hopper, via the corresponding factory
fitted flying lead and pre-wired 6-way connector (to be found within the electrical wiring enclosure
at the rear of the pellet hopper).
•The 3-way plug provides the electrical connection for the remote auger unit. A suitably sized
cable of the required length must be connected between the corresponding 3-way connector
(supplied fitted to the plug) and the electrical isolator of the remote auger (mounted on the bulk
pellet store). Refer to Figure 5-5.
The vacuum unit has a control panel fitted with a ‘VACUUM SYSTEM’ ON/OFF switch and indicator neon.
Refer to Figure 3-3.
Figure 3-3.
Vacuum unit control panel
For details on the operation of these controls, refer to the User Instructions in Section 8 of these
Installation & User Instructions.
3.2 Auger Unit
The auger unit has been designed to be mounted directly onto the Grant bulk pellet store (with the fixings
supplied on the store) using the holes already present around the rectangular outlet opening at the base
of the store. It can also be fitted to other bulk pellet stores by drilling the required holes (using the auger
mounting flange as a template) – refer to Section 4.1.
The unit consists of a 410mm long auger, driven by an electric motor, which delivers pellets into the
suction chamber. Refer to Figure 3-5.
Two steel connection spigots are provided, on the end of the suction chamber, for connection of the
vacuum system flexible tubes. Refer to Figure 3-5. The auger motor and suction chamber are enclosed
beneath a removable steel cover, held in place by two nuts.
A 3-pole 16A isolator is factory fitted to the auger unit for local isolation of the auger motor when required.
This isolator is pre-wired to the auger motor. An electrical supply, from the 3-way plug on the vacuum
unit, must be connected by the installer to the input of the isolator. Refer to Section 5 for electrical
connection details.

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3.3 Flexible Pellet Tubes
Two lengths of flexible tube (supplied with the SpiraVac system kit) are used to connect the vacuum unit
(on the top of the pellet hopper) to the auger unit (mounted on the bulk pellet store).
The tube supplied is a 50mm diameter reinforced Polyurethane flexible tube with a copper anti-static wire
moulded into the tube wall. When fitting the tube, this wire must be exposed and placed in contact with
the steel connections (on the vacuum and auger units) at each end. Refer to Section 5.3 for details.
The maximum length of tube between the vacuum and auger units is 20 metres (i.e. 2 x 20 metres lengths
- one each way). The maximum rise over that length is 5 metres. No reduction in this maximum allowance
is required for any changes in the height of the tube over the length of run.
Both tubes are secured at each end, to the connections on the vacuum and auger units, using the four
hose clips provided with the kit. Refer to Section 4.3 for details.
Any pellet tubes run against walls MUST be adequately supported at no more that 1 metre centres, and
at either sides of a bend in the tube, using the 50mm metal pipe clips provided.
3.4 Operating Sequences
The vacuum unit has a ‘VACUUM SYSTEM’ ON/OFF switch on the control panel.
•When this switch is set to ON – the vacuum system operates in Automatic mode. Refer to
Section 3.4.1 below.
•When this switch is set to OFF – the vacuum system operates in Manual mode. Refer to Section
3.4.2 below
3.4.1 Automatic Mode
With the VACUUM SYSTEM switch is set to ON the SpiraVac vacuum system is operational.
In this condition the SpiraVac can function in one of two different automatic operating modes:
•
‘Top-up’ mode
– to automatically top-up the hopper when the weight of pellets in the pellet
hopper falls below the minimum level, as detected by the contents diaphragm switch. Once the
contents switch is activated, the vacuum motor and filling process will automatically start, as
detailed below.
Figure 3-5
. Auger unit with cover removed
Figure 3-4.
Auger unit with cover fitted

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•
‘24 hour’ mode
– to automatically fill the hopper with pellets, up to the trap door of the vacuum
unit trap door, every 24 hours starting when the ON/OFF switch on the SpiraVac control panel is
first set to ON.
In both cases the operation of the vacuum unit is as follows – Refer to the flow diagram in Figure 3-6.
The vacuum motor will start and create a vacuum in the cyclone. This pulls closed the trap door at the
base of the cyclone. The vacuum switch, inside the vacuum unit, is activated. Power is supplied to the
pellet auger located in the base of the bulk pellet store.
The auger starts and pulls pellets into the suction chamber of the auger unit, where they are drawn into
and through the flexible suction tube to the vacuum unit, and then deposited in the cyclone. The red
indicator neon on the vacuum unit control panel will blink on and off during this process.
The pellet auger runs for
60 seconds
and is then automatically switched off. The vacuum motor runs on
for a further
15 seconds
after the auger has stopped (to ensure no pellet build up in the tubes) before it is
automatically switched off (i.e. a total vacuum motor running time of 75 seconds).
When the vacuum unit stops, the loss of the vacuum allows the weight of the pellets to open the trap door
and the pellets fall into the hopper.
The vacuum system will deliver approximately 6kg of pellets in each operation, and will therefore have to
operate several times to either top up or fill the pellet hopper.
When the ‘VACUUM SYSTEM’ ON/OFF switch is first set to ON
The vacuum system will operate repeatedly, as described above, until the hopper is filled with pellets up
to the level of the trap door of the cyclone. In this condition the trap door will be prevented from closing
by the pellets. This is intentional as further operation of the vacuum system is not required with this
amount of pellets in the hopper.
Thereafter the vacuum unit will operate automatically in one of the two following ways:
‘Top-up’ mode
In this operating mode the SpiraVac system will only operate if the level of the pellets in the hopper falls
below the minimum level monitored by the contents diaphragm switch.
The vacuum system will operate repeatedly to top-up the hopper until it is filled with pellets up to the level
of the trap door of the cyclone as on the initial operation of the vacuum system. In this condition the trap
door will be prevented from closing by the pellets.
If the pellet hopper contents switch has detected a low pellet level and the vacuum motor system is
operating, but the pellet hopper contents switch is not satisfied after 26 attempts (e.g. due to the bulk
pellet store being empty) then the system will go into ‘fault’ mode.
The indicator neon on the control panel will remain on constantly. The user can over-ride this by switching
the ‘VACUUM SYSTEM’ switch to OFF and filling the pellet hopper manually (see Section 3.4.2 – Manual
Mode below).
NOTE
When the ‘VACUUM SYSTEM’ switch is set to OFF the indicator neon will remain lit. When it is
switched back to ON the indicator neon will now go out.

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‘24 hour’ mode
In this operating mode, the SpiraVac system will only operate after exactly 24 hours has elapsed since the
‘VACUUM SYSTEM’ ON/OFF switch on the SpiraVac control panel was last set to ON.
The vacuum system will operate repeatedly until the hopper is filled with pellets up to the trap door of the
cyclone, as on the initial operation of the vacuum system.
It is possible to re-set the time that this ’24 hour’ operation occurs to a more suitable time (e.g. during the
evening) to avoid the automatic operation of the vacuum system during the night time.
To do this, simply switch the ‘VACUUM SYSTEM’ switch to OFF, wait about 2 seconds and then switch it
back to ON at the time you wish the ’24-hour’ operation to occur. This time will be automatically stored in
the control system memory and the store will then fill at the same time every day (if required).
NOTE
If the power supply to the Spira Boiler and SpiraVac system is interrupted, either deliberately or otherwise
(e.g. a power cut), the built-in timer function will stop for the duration of the power interruption.
Whilst the SpiraVac system will automatically continue to operate in the ’24 hour’ mode when the power is
reconnected, and the original time setting will be remembered, the actual time it will operate to fill the
hopper will now be incorrect, i.e. delayed by the duration of the power interruption.
Example: If the ‘24hour’ mode was originally set to operate at 6.00pm every day, but a power cut lasting
1 hour occurred, the ‘24hour’ mode will now operate at 7.00pm after the power is reconnected.
It will therefore be necessary to reset the ‘24 hour’ mode following a power interruption if the original ’24
hour’ mode operating time setting is still required. To do this, simply switch the ‘VACUUM SYSTEM’
switch to OFF, wait for about 2 seconds and then switch back to ON at the time you wish the ’24-hour’
operation to occur.
3.4.2 Manual Mode
With the ‘VACUUM SYSTEM’ switch on the SpiraVac control panel set to OFF, the hopper will function as
if no vacuum system is fitted.
In this setting, the pellet hopper can be fed with bagged pellets for as long as required.
The switched live to the boiler will be interrupted when the weight of pellets in the pellet hopper falls below
the minimum level of the contents diaphragm switch, and the burner will shut down.
The burner control panel screen on the Spira boiler will show a ‘WAIT BOILER THERMOSTAT’ message
until the pellet level in the hopper is topped up with at least an additional 20kg of pellets.

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Figure 3-6.
SpiraVac operation flow diagram

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4. Installation
4.1 Auger Unit
1. To fit the auger unit to the Grant bulk pellet store, use the following procedure:
Unscrew and remove the two domed nuts and remove the galvanised steel cover from the auger
unit. Refer to Figure 4-1.
2. Unscrew and remove the four nuts holding the mounting flange to the auger unit and remove
the flange over the auger. Refer to Figures 4-3 and 4-4. Leave the circular neoprene gasket in
place on the auger.
IMPORTANT: Take care not to strain the cable between the isolator (on the mounting flange) and the
auger motor (in auger unit).
3. On the bottom section of the bulk pellet store, unscrew and remove the eight M8 screws
around the auger sleeve opening. Remove and discard the flange and auger sleeve but
keep the
screws
. Refer to Figure 4-5. Ensure that the factory-fitted neoprene gasket is still in place around
the opening and not damaged. Refer to Figure 4-6. The SpiraVac auger unit can be fitted to this
opening as described in paragraph 5 below.
Figure 4-3.
Auger unit flange fixings - left
Figure 4-2.
Auger unit with cover removed
Figure 4-4.
Auger unit flange fixings - right
Figure 4-1A.
Auger unit with cover fitted
Fixing
bolts
Domed nuts
Fixing
bolts

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4.
Alternatively, the SpiraVac auger unit can be fitted to the opening provided on the opposite
face to the auger sleeve opening.
This opening is lower on the store than the auger sleeve
opening.
To do this, first remove the auger sleeve from the store as described above. Then unscrew and
remove the eight M8 screws around the removable panel (on opposite face to auger sleeve).
Remove the panel, fit it to the auger sleeve opening and secure in place with the screws
previously removed. Ensure that the factory-fitted neoprene gasket is still in place around the
opening and not damaged. Refer to Figure 4-6.
5. Position the auger unit mounting flange over the outlet opening, aligning the holes in the flange
with those around the opening. Ensure that the electrical isolator is correctly positioned to the
right of the hole. Refer to Figure 4-7.
IMPORTANT: Ensure that the four fixing bolts are correctly fitted through the mounting flange (from the
back) before fitting the flange to the bulk pellet store.
6. Fasten the mounting flange to the bottom section of the pellet store using the eight M8 screws
previously removed. Refer to Figure 4-7.
7. Check that the circular neoprene gasket is correctly fitted on the auger, against the back face
of the suction chamber. Fit the auger through the round hole in the mounting flange and align the
four bolts on the mounting flange with the four holes on the auger unit. Fit the four nuts to secure
the auger unit to the bulk pellet store. Refer to Figure 4-8.
Figure 4-5.
Bulk store flange/auger sleeve
Figure 4-8.
Auger unit mounted on store
Figure 4-7.
Auger unit mounting flange fitted
Figure 4-6.
Bulk store opening with gasket
M8 fixing screws
Neoprene gasket

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4.2 Vacuum Unit
To fit the vacuum unit to the Grant Spira pellet hopper, use the following procedure:
1. Open the hinged door on top of the pellet hopper. Disengage the door stay from the slot (on
left hand side) and lay the door flat on the rear top section. Refer to Figure 4-9.
2. Unscrew and remove the six screws along the front and back edges of the grill and remove
the grille from the front of the hopper. Refer to Figure 4-10.
3. Close the door. Unscrew and remove the four screws holding the top rear panel to the hopper.
Remove the complete top panel assembly (including hinged door) from the hopper.
4. Unscrew and remove the four nuts holding the square cover panel in place on the rear top
panel of the hopper. Remove the cover panel from the hopper. Refer to Figure 4-11.
5. Carefully place the vacuum unit, top down, on something to protect the paint finish. Remove
the four fixing screws from the vacuum unit. Invert the top panel and place it over the cyclone of
the vacuum unit. Position the top panel so that the vacuum unit faces in the required direction –
forwards or to the left or right. Refer to Figure 4-12.
6. Fix the panel to the underside of the vacuum unit using the four screws supplied with the
vacuum unit – screwing through the panel into the threaded inserts in the base of the vacuum
unit.
Figure 4-10.
Hopper grille fixings
Figure 4-11.
Hopper top panel
Figure 4-12.
Panel and vacuum unit
Figure 4-9.
Hopper door opened flat
Remove these screws

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7. Unscrew and remove the three screws and nuts holding the pellet deflector channel inside the
rear of the hopper. Take care not to drop the small nuts into the hopper!
Remove the deflector channel from the hopper and replace the screws and nuts to block off the
holes. Refer to Figure 4-13.
8. Re-fit the top panel (complete with vacuum unit) back on top of the hopper. Secure top panel
using the four screws previously removed. Refer to Figure 4-14.
NOTE: THIS IS A JOB FOR TWO PERSONS AS THE VACUUM UNIT IS HEAVY!
9. Open the hinged door on top of the pellet hopper and rest it against the front of the vacuum
unit. To prevent the door from dropping closed whilst fitting the pellet dam plate, secure it to the
vacuum unit using duct tape or similar.
10. Fit the pellet dam plate into the hopper with the bracket (on the back of the plate) facing
toward the back of the hopper and the three fixing holes at the top. Refer to Figure 4-15.
Fix the pellet dam plate in place using three screws (previously removed) in the corresponding
holes along the front edge of the hopper rear top panel. Refer to Figure 4-16.
NOTE: Do not tighten these three screws but leave them with about 2 - 3mm of thread showing.
11. Insert the grille into the hopper opening (with the door stay opening to the left). Align and
engage the three ‘keyhole’ slots (in the rear edge of the grille) with the three corresponding grille
fixing screws on the front edge of the hopper rear top panel. Refer to Figure 4-17.
Figure 4-13.
Pellet deflector channel
Figure 4-14.
Vacuum unit on hopper
Figure 4-15.
Pellet dam plate
Figure 4-16. P
ellet dam plate fixings

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12. Fit the three remaining screws (previously removed) in the holes along the front edge of the
grille and tighten all six screws to secure the grille and pellet dam plate in position. Refer to
Figure 4-18.
IMPORTANT: ENSURE THAT SCREWS ARE NOT DROPPED INSIDE THE HOPPER!
13. Locate the door stay in the slot (on left hand side) and check the door opens and closes
correctly. Refer to Figure 4-19.
4.3 Flexible Pellet Tubes
Two flexible tubes must be used to connect the Vacuum unit (on the pellet hopper) to the Auger unit (on
the bulk pellet store).
IMPORTANT:
The connection marked ‘VACUUM FLOW’ on the auger unit MUST be connected to the corresponding
‘VACUUM FLOW’ connection on the vacuum unit. Similarly, the ‘VACUUM RETURN’ connections on the
auger and vacuum units must be connected together.
All connections must be made using the following procedure:
1. Cut the two flexible tubes to the required length.
2. Cut back the tube at each end to expose approximately 40-50mm of the copper anti-static
wire. Refer to Figure 4-20.
Figure 4-17.
Secure dam plate and grille
Figure 4-18.
Fix grille at front edge
Figure 4-19.
Grille and pellet dam plate fitted

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3. Place one of the jubilee clips provided over the end of the tube. Fold the anti-static wire back
inside the tube. Refer to Figure 4-21.
4. Push the tube fully onto the ‘VACUUM RETURN’ connection spigot (on the vacuum unit),
ensuring that the anti-static wire is in contact with the unpainted steel surface of the connection
spigot. Tighten the jubilee clip to secure the tube in place and clamp the anti-static wire to the
spigot. Refer to Figure 4-22.
5. Connect the other end of the flexible tube to the ‘VACUUM RETURN’ on the auger unit.
6. Repeat this process using the second flexible tube to connect the ‘VACUUM FLOW’
connection (on the auger unit) to the ‘VACUUM FLOW’ connection (on the vacuum unit).
If the vacuum unit operates but no pellets are delivered to the hopper from the store:
•Switch the ‘VACUUM SYSTEM’ ON/OFF switch to OFF.
•Isolate the electrical supply to the boiler and SpiraVac system.
•Check that two flexible tubes between the vacuum unit and auger unit are correctly connected.
•Rectify any incorrect ‘cross connections’
•Reconnect the power supply, Switch the ‘VACUUM SYSTEM’ ON/OFF switch to ON and check
that the SpiraVac system operates correctly.
Figure 4-22.
Tube secured with clip
Figure 4-20.
Anti-static wire exposed
Figure 4-21.
Anti-static wire folded in

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5. Electrical
5.1 General
The electrical installation, including internal and external wiring and supplementary earth bonding, must
be installed by a competent person to comply with the requirements of the Electricity at Work Regulations
1989 and BS7671:2008 – IET Wiring Regulations 17th Edition (including all amendments).
5.2 Connection to Pellet Hopper
The electrical supply to the boiler (and SpiraVac system) is connected to the pellet hopper. Refer to either
Figure 5-2 (for single boiler hopper) or Figure 5-3 (for double boiler hopper) for the electrical wiring
diagram for the pellet hopper.
The Grant Spira pellet boiler and SpiraVac system requires a 230V ~ 50 Hz supply. This must be
supplied via a 13A fused double pole isolator, providing complete electrical isolation for the heating
control system, Spira hopper/boiler and SpiraVac system.
A second fused double pole isolator is required to provide a 5A fused supply to the boiler and heating
control system only. Refer to Figure 5-6 for the wiring details with an S-plan type heating control system.
The power supply cable to the hopper should be at least 1.5mm² PVC.
Refer to the main Installation Instructions, supplied with the boiler, for further details on the wiring of the
electrical system controls and the other electrical connections on the boiler to be made during
installation.
Note: The hopper is fitted with a selector switch (located inside the wiring centre). Ensure that this switch
is set to the ‘BULK STORE’ position when connecting the 6-way pre-wired plug from the hopper to the
Vacuum unit. See Figure 5-1.
Figure 5-1.
Location of selector switch (inside hopper wiring centre)
5.3 Connection of Vacuum Unit to Pellet Hopper
The vacuum unit is supplied with two factory-fitted flying leads with pre-wired plugs.
The 6-way plug and lead connects the vacuum unit to the pellet hopper. Connect this plug to the
corresponding 6-way connector (to be found within the electrical wiring enclosure at the rear of the pellet
hopper). Refer to Figure 5-1 for location of 6-way connector.
6-way connector (docked on
the contents switch bracket)
Selector switch

20
This connection provides the 230V 50 Hz electrical supply required to operate the Grant SpiraVAC
system, and switched live (to start the vacuum system when the contents switch in the hopper detects a
minimum pellet level).
To connect the hopper to the Vacuum unit:
•Remove the wiring centre cover from the rear of the hopper.
•Unclip the 6-way plug from diaphragm switch bracket.
•Pass the 6-way plug lead through the grommet just below the wiring centre cover.
•Set the selector switch on the diaphragm switch bracket to the ‘BULK STORE’ position. See
Figure 5-1.
•Replace the wiring centre cover and fasten in place using the screws previously removed.
•Connect the 6-way plug to the corresponding 6-way connector on the pre-wired flying lead fitted
to the Vacuum unit. Ensure that the plug and socket are fully pushed together until the small
catch clicks into place.
5.4 Connection of Vacuum Unit to Auger Unit
The 3-way plug and lead provides the 230V electrical supply from the vacuum unit to the remote auger
unit.
A corresponding 3-way connector is supplied fitted to the plug for connection of the cable to the remote
auger unit
The auger unit is supplied with a factory fitted isolator, which is pre-wired to the auger motor.
The connection between the 3-way plug connection (at the vacuum unit) and the electrical isolator (on the
auger unit) must be made using a suitable size and type of cable, dependant on the cable length and the
route taken to the auger unit.
Where this is external to the building this cable must be of a suitable specification, e.g. UV stabilised PVC
sheath, SWA cable, etc. depending on the application.
Refer to Figure 5-5 for details of the plug and socket connection between the vacuum unit and the auger
unit.IN