H E A T I N T E R F A C E U N I T
I N S T A L L A T I O N
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H E A T I N T E R F A C E U N I T
I N S T A L L A T I O N
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7.4 Electrical Connections
Electrical connections must be made by an
authorised electrician only.
Electrical connections must be made in
accordance with current regulations and local
standards.
CAUTION
The HIU installation must be undertaken by
qualified/competent mechanical and electrical
engineers. The installation must also be in
accordance with all Building Regulations
applicable to location and the IET Electrical
Regulations.
DANGER
Electricity can cause serious and fatal injuries.
Always isolate the electrical supply and test before
commencing work.
Fig. 13 Guiding Channels
All electrical equipment in the HIU is connected to
the junction box. Before adding power to the unit,
verify that no electrical connections have been
disconnected on the components.
All accessories and main power supply will be
connected in the junction box housing.
Follow the information and wiring diagrams in
Section 7.5.
Check the earth connection; ensure it is sufficient
enough to withstand the power being distributed.
Check the electrical connection reflects the
voltage rating and adheres to current legislation.
Before any electrical work is undertaken, please
refer to safety notes (Section 3).
The HIU should not run via site temporary power
supply. Failure to observe will void the warranty.
HIU must be connected to a 230V un-switched
fused spur fitted with a 5A fuse and wired in
accordance with the BS 7671 Electrical Wiring
Regulations.
Multiple cable guiding channels have been
provided in the insulation casing and must be
used when making the connections to the HIU
(Fig 13).
7.5 Wiring Installation
7.5.1 Wiring Diagram (Radiator)
