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3.6 ELECTRICAL
WARNING: This appliance must be earthed. It is suitable for a.c. supply only.
Electrical installation must be carried out by a competent electrician and be in
accordance with the latest i.e.e wiring regulations.
Ensure the electrical supply is switched off before making any connections to the
water heater.
3.6.1 The unit is supplied tted with a 0.75m 3 core 1.5mm
2
exible cable. The
electricity supply should be fused 13 Amp and be via a double pole isolating
switch with a contact separation of at least 3mm in both poles. Refer to the
gure 6 below.
3.6.2 The wires are colour coded as follows:
Green and Yellow EARTH
Brown LIVE (L)
Blue NEUTRAL (N)
3.4 PLUMBING
3.4.1 Refer to the section IMPORTANT INSTALLATION POINTS to determine
which valves and accessories are required. Plumb in the valves in the sequence
shown in the relevant Diagrams ( Figures 2, 3, and 4).
3.4.2 Both inlet and outlet pipes are clearly labelled. The pipes are 15mm copper
tube and are suitable for compression ttings. It is recommended that a WRAS
listed isolating valve (not supplied) is tted on the cold water supply to the
heater. Several hot outlets can be served.
3.4.3 Do not use solder joints as this will damage the heater and may prevent servicing
under warranty.
3.4.4 Plumbers Paste must not be used as it can impair the operation of the valves.
3.5 DISCHARGE
3.5.1 The discharge outlet from the Pressure (Expansion) Relief Valve and the
Temperature & Pressure Relief Valve (if tted) must be connected to a
discharge pipe. It is recommended that a tundish (not supplied) be installed in
the discharge pipe to give a visible indication that the valves are operating.
3.5.2 The discharge pipe must be installed in a continuously downward direction
and in a frost free environment.
3.5.3 The pipe from the valves to the tundish should be 15mm o/dia minimum. From
the tundish to the point of discharge the pipe should be 22mm o/dia minimum
and have a resistance to ow equivalent to 9 metres of straight pipe. Long
discharge pipe runs should have an increased internal diameter.
3.5.4 The pipe material should be capable of conveying water/steam at 100°C.
3.5.5 The nal discharge point should be in a safe, visible position.
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