Electrical
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3. On a double boiler installation, fit
the second 5-way plug from the
double hopper into the top right
rear of the second boiler. Ensure it
is fully pushed home.
4. Fit the two 7-way plugs (No.1 and
No.2) from the boiler control panel
into the two lower connections on
the left side of the burner. These
plugs are male and female and
cannot be fitted into the wrong
connections. Refer to Figure 8-3.
Ensure that both plugs are fully
pushed home until the small catch
on each of them clicks into place.
5. Fit the 6-way plug (No.3) from the
pellet feed auger motor into the
upper connection on the left side of
the burner. Refer to Figure 8-4.
Ensure that the plug is fully pushed
home until the small catch it clicks
into place.
6. If a bulk pellet store is to be used,
connect the 6-way plug to the
corresponding connection on the
flying lead from either the Grant
SPIRA-VAC system or Grant bulk
pellet store auger. Ensure that the
plug and socket are fully pushed
together until the small catch clicks
into place.
Refer to instructions supplied with
either the Grant SPIRA-VAC or
Grant bulk store auger for further
details.
8.4 Heating System Controls
The boiler can be used in conjunction
with typical heating control system, e.g.
‘S-Plan’ or ‘Y-Plan’ type controls. Refer
to Figures 8-9 and 8-10 and for typical
control system wiring diagrams.
As the electrical connection (permanent
mains supply and switched live from the
heating control system) to the boiler is
made via the flying lead with 4-way plug
connection it will be necessary to
provide a 4-core flying lead either
a) Directly from the heating controls
wiring centre – if suitable located
adjacent to the boiler/hopper, or
b) Via a junction box situated adjacent
to the boiler hopper.
The length of 4-core flex required
(between the wiring centre or junction
box and the 4-way plug connection)
must be sufficient to allow the hopper
to be moved out enough to allow
disconnection the 4-way plug.
Frost Protection
For additional protection of either the
entire heating system, or the boiler and
localised pipework, it is recommended
that a frost thermostat be installed. It is
also recommended that it be used in
conjunction with a pipe thermostat to
avoid unnecessary and wasteful
overheating of the property.
The pipe thermostat should be located
on the boiler return pipe, and set to
operate at 25°C. Refer to Figures 8-9 or
8-10 as appropriate for connection
details.
8.5 Connecting the Power
Supply
The boiler requires a permanent mains
supply and a switched live supply to
control the boiler. For details of Controls
refer to Section 8.4 and Figures 8-9 or
8-10.
Do NOT interrupt the permanent supply
to the hopper/boiler with any external
controls.
The power supply cable and flex should
be at least 0.75mm2 PVC as specified
in BS 6500 - Table 16.
Connect the mains supply using the
following procedure:
1. Press down on the small catch
(between the two parts of the
factory-fitted 4-way plug/socket
connector) to release it.
2. Separate the two parts and remove
the cover from the male 4-way plug.
3. Connect the flex to the 4-way male
plug as follows:
• Terminal L2 – Switched live (from
heating system controls)
• Terminal N – Mains neutral
• Terminal (earth) – Mains earth
• Terminal L1 – Mains (permanent)
live
4. Replace the cover, ensuring outer
sheath of the flex is held in the
cable grip of the plug, and secure
using the screws previously
removed.
Figure 8-3: Hopper plug connection
Figure 8-4: Auger plug connection
Before making any connections to
the heating systems controls ensure
that the electrical supply is isolated
at the fused spur serving the
controls and boiler, that the fuse has
been removed and the isolator is
locked off.
Do NOT connect the electrical
supply to the hopper, by connecting
the 4-way plug and socket together,
untill ALL plug connections have
been correctly made between the
hopper, boiler and (if fitted) the bulk
pellet supply system.
!
WARNING
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