Electrical Connections; Commissioning; General; Checklist Before Commissioning - Heatrae Sadia Multipoint ECO 30L V 3kW Installation, Operation And Maintenance Manual

6.3 Electrical connections

In case of difficulty contact service support; contact
details are available on page 36 of this booklet.
WARNING
Isolate the mains electrical supply
`
before removing any covers.
Never attempt to replace the immersion
`
heater other than with the recommended
immersion heater.
DO NOT bypass the thermal cut-out(s)
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in any circumstances. Ensure the two
spade terminations on thermostat and
thermal cut-out are pushed firmly onto
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 protection device and double
pole isolating switch with a contact
separation of at least 3mm in both
poles.
DO NOT apply electrical power to the
`
water heater until the unit has been
filled with water.
Check that the electrical supply is of sufficent
`
current rating and voltage.
The length of flex supplied is 2 metres.
`
The water heater will be pre-wired but will need
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wiring into a fused switched spur.
As the unit is pre-wired there should be no
`
requirement to open the electrical cover. Should
access be required (see Figure 10, page 26).
The wires are colour coded as follows:
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Green and Yellow
Brown
Blue
EARTH
LIVE (L)
NEUTRAL (N)

7. Commissioning

7.1 General

WARNING
DO NOT apply electrical power to the water
heater until the unit 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 or should be matched to
the incoming cold water mains pressure. The pre-
charge pressure is checked using a car tyre gauge
by unscrewing the plastic cap opposite the water
connection.
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 and depressurise unit.
`
Remove the pressure reducing valve head work to
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access the strainer mesh, clean and re-fit.
Turn the water supply back on.
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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.
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Check all electrical connections are tight.
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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

Switch on electrical supply to the water heater. You
`
will notice that the display and all options will light
up for a few seconds.
After a few seconds the display will go into its
`
S
default smart setting. The "°C" graphic will blink
while heating.
In this default mode the temperature of the water is
`
automatically selected but will adjust based on the
usage patterns learnt.
Please see section 8, Operation, page 16 for more
`
information on setting the water heater up.
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