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6.3 Electrical connections
WARNING
Disconnect from the mains electrical
`
supply before removing any covers.
Never
`
immersion heater other than with the
recommended immersion heater.
DO NOT bypass the thermal cut-out
`
in any circumstances. Ensure the two
spade terminations on the wires from
the thermostat and thermal cut-out are
pushed firmly into the corresponding
terminations on the element plate
assembly.
All electrical wiring should be carried
`
out by a competent electrician and be
in accordance with the latest I.E.E,
Wiring Regulations.
Each circuit must be protected by a
`
suitable fuse and double pole isolating
switch with a contact separation of at
least 3mm in both poles.
DO NOT operate the immersion heater
`
until the appliance has been filled with
water.
Check that the electrical supply is of sufficent
`
current rating and voltage, see Technical Data
page 5.
A 2 metre length of flexible cable is supplied
`
factory fitted. The cable specification is H05VV-F
3G 2.5mm
. If replacing or extending the same
2
specification of cable should be used.
The flexible cable must be wired into an
`
appropriately fused switched spur.
The conductor sheaths are colour coded as follows:
`
Green and Yellow
Brown
Blue
In case of difficulty contact service support; contact
details are available on page 28 of this booklet.
attempt
to
replace
EARTH
LIVE
(L)
NEUTRAL
(N)
7. Commissioning
7.1 General
WARNING
the
DO NOT operate the immersion until the
water heater has been filled with water.
7.2 Checklist before commissioning
Check that all installation and discharge pipe
`
requirements have been met.
Check expansion vessel pre-charge pressure. The
`
vessel is supplied precharged to 0.35MPa (3.5
bar) to match the control pressure of the Pressure
Reducing Valve. The pre-charge pressure is
checked using a car tyre gauge by unscrewing the
plastic cap opposite the water connection.
Check all water connections are tight.
`
Check all electrical connections are tight.
`
Check all earth bonding links are connected, tight
`
and un-damaged.
Check earth continuity, short circuits, polarity and
`
resistance to earth.
7.3 Commissioning procedure
Open a hot tap furthest from the water heater and
`
turn on the water supply to the water heater.
Allow water heater to fill and leave hot tap running
`
for a short while to purge any air and flush out the
pipework.
Open successive hot taps to purge the system of
`
air.
Check all water connections for leaks and rectify
`
as necessary.
Turn off mains water supply.
`
Remove the Pressure Reducing Valve head work
`
to access the strainer mesh, clean and re-fit, see
Figure 9, page 17.
Turn the water supply back on.
`
Manually open, for a few seconds, each relief valve
`
in turn, checking that water is discharged and runs
freely through the tundish and out at the discharge
point.
Ensure that the valve(s) reseat satisfactorily.
`
If necessary set the temperature control knob to
`
the desired setting. Factory setting is 54
Switch on the electrical supply. The indicator
`
light will illuminate during heating. When the set
temperature is reached the indicator light will go
out.
The set temperature can be adjusted by rotating the
`
control knob. This can be set to give temperatures
in the range 10°C to 70°C (see fgure 8, page 16).
In hard water areas it is advised that the maximum
temperature is restricted to prevent build up of
scale. Temperatures above 55
consideration should be given to blending at the
point of use to a safe user temperature.
o
C.
o
C can scald so
15
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