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8.1 General Requirements

The Grant Spira Condensing Wood
Pellet boiler requires a 230 V ~50 Hz
electrical supply. The unit must be
connected to a mains power supply
via a fused spur that is protected by a
30mA RCD.

The boiler requires both a permanent
mains supply and a switched live
supply to control the boiler.

The fused spur of the power supply to
the boiler and controls must be fitted
with a 13A fuse.

A second fused spur (5A fuse) fed from
the first fused spur is included to supply
the heating system controls circulating
pump. Refer to Figure 8-9 and 8-10.

For the UK, the electrical installation
must be carried out by a competent
installer in accordance with the
requirements of the Electricity at work
Regulations 1989 and BS 7671:2008
– IET Wiring Regulations 17th Edition
(including all amendments).

All the wiring and supplementary earth
bonding external to the boiler must
be in accordance with the current IET
wiring regulations.

Any heating system controls, e.g.
room thermostat , frost thermostat,
etc. connected to this boiler must be
suitable for use on mains voltage.

8.2 Hopper Electrical

Connections

All Grant Spira boiler pellet hoppers are
fitted with two in-line 5A fuses. These
are located inside the electrical wiring
enclosure in the back of the pellet
hoppers.

8.2.1 Single Boiler Hopper

(with a single auger) – in either a left
hand or right hand version as required,
to supply a single boiler.

This hopper is fitted with three pre-wired
flying leads with factory-fitted plugs:
• 4-way plug – for connection of the

permanent live, earth and neutral

and also the switched live from the

heating controls system.

• 5-way plug – to connect the hopper

to the boiler.

• 6-way plug – to connect either a

bulk pellet store auger or Grant

SpiraVac vacuum system to the

hopper and boiler.

Refer to Figure 8-7 for hopper wiring
diagram.

8.2.2 Double Boiler Hopper

(with two augers) – to supply two boilers
in a ‘double boiler’ installation.

This hopper is fitted with four pre-wired
flying leads with factory-fitted plugs:
• 4-way plug – for connection of the

permanent live, earth and neutral

and also the switched live from the

heating controls system.

• Two 5-way plugs – one to connect

to each of the two boilers.

• 6-way plug – to connect either a

bulk pellet store auger or Grant

SpiraVac vacuum system to the

hopper and boiler.

Refer to Figure 8-8 for double hopper
wiring diagram.

8.2.3 For Installations with a Bulk
Pellet Store only

Both single boiler and double boiler
hoppers are supplied with the 6-way
plug parked inside the wiring enclosure.
See Figure 8-1.

If a bulk pellet store is to be used:
• 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 toggle switch on the

diaphragm switch bracket to ‘BULK

STORE’. See Figure 8-1.

• 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

either the bulk pellet auger or Grant

SpiraVac system.

• If using the Grant SpiraVac

system, refer to the installation

instructions supplied with the

system for further details on its

installation and operation.

8.2.4 For Installations using the
Pellet Hopper only

The pellet hopper is supplied with the
toggle switch set to ‘HOPPER ONLY’.
When used without a bulk pellet store,
the pellet hopper has the facility for
the connection of a 230V ‘low pellet’
indicator lamp (not supplied). This will
indicate to the householder that the
pellets in the hopper have reached the
minimum level and the hopper needs to
be topped up.

The indicator lamp should be
positioned so it can be easily viewed by
the householder. See either Figure 8-7
or 8-8, as applicable, for the connection
details.

If a bulk store is used, with either the
Grant SpiraVac system or a Grant bulk
auger, a ‘low pellet’ indicator lamp

cannot

be fitted to the pellet hopper.

8 Electrical

Figure 8-1:

Hopper selector switch and

6-way plug