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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 8-7 or
8-8 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 1.5mm
2
PVC.
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,
until ALL plug connections have
been correctly made between the
hopper, boiler and (if fitted) the bulk
pellet supply system.
!
WARNING
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
Refer to Figures 8-9 or 8-10
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.
5. Connect the other end of the 4-
core flex to the either the heating
system controls wiring centre or
junction box. Refer to either Figures
8-9 or 8-10, as appropriate, for
details of the connections required.
6. Fit the two parts of the 4-way
connector back together. Ensure
the plug and socket are fully
pushed together until the small
catch clicks into place.
In the event of an electrical fault after
installation of the boiler, the following
electrical system checks must be
carried out.
• Short circuit
• Polarity
• Earth continuity
• Resistance to earth
The Grant wood pellet boiler and
intermediate hopper contains
electrical switching equipment and
must be earthed; also any bulk
hopper system fitted should also be
earthed.
!
WARNING
!
NOTE
The fused spur of the power supply
to the boiler and controls must be
fitted with a 13A fuse when a Grant
SpiraVac vacuum system is fitted;
otherwise a 5A fuse is required.
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