Maintenance - Heatrae Sadia Multipoint 75 Fitting Instructions And User Manual

7.0 COMMISSIONING
7.1 Do not switch on the electrical supply until the Multipoint has been filled
with water and checked for leaks.
7.2 Check that all installation, electrical and discharge pipe requirements
have been met.
7.3 Check that all water and electrical connections are tight.
7.4 Open a hot water tap, turn on mains water supply to the Multipoint.
7.5 Allow Multipoint to fill and leave hot tap running for a short while to purge
any air and flush out the pipework. Close the hot tap and check the
system for leaks.
7.6 Manually test the operation of the Temperature/Pressure Relief Valves
and the Pressure (expansion) Relief Valve. Ensure water flows freely from
the valves and through the discharge pipes.
7.7 Switch on the electrical supply. The indicator lights will illuminate during
heating. When the set temperature is reached the indicator lights will go
out.
7.8 The set temperature can be adjusted by rotating the thermostat controls
located inside the terminal cover. It is recommeded that both thermostats
are set at position 6 (approximatley 60°C) however they can be adjusted
between settings 1 to 7 (5°C to 75°C). In hard water areas it is advised
that the maximum temperature is restricted to prevent build up of scale.

8.0 MAINTENANCE

Little maintenance is required, however in hard water areas the unit will
require periodic descaling to ensure efficient operation. To descale the unit:
8.1 Switch off and disconnect the electrical supply. Turn off the water supply
to the unit.
8.2 Open a hot tap to relieve any system pressure.
8.3 Remove the terminal cover by removing the five supporting screws holding
it in place.
8.4 Drain water by opening internal drain cocks.
8.5 Unclip the expansion vessel retaining clip and locate the expansion
vessel into the nest detail at the front on the right (see Figure 6 overleaf).
8.6 Disconnect the electrical terminals to the element and the earth link to
the earthing stud. Withdraw the thermostat and thermal cut-out capillary
tubes from the pockets on the element plate.
8.7 Remove the element plate assembly by unscrewing the five securing
screws. Tapped jacking holes are provided (NOTE: a quantity of water
may still be present in the container, it is recommended that a container
be placed under the unit to collect any spillage).
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