Redring 47789501, Instructions For Use And Maintenance Manual

Page: 5 / 12

Instructions for use and maintenance
5
Do not fit any stop-cocks
or non-return valves within
the distance required for
expansion.
The distances quoted are
for 15 mm pipe these can
be approximately halved
for 22 mm pipe to shorten
the distance required for
expansion.
fig. 4b
Using a pressure reducing valve (set at 3.5 bar), a non-return valve and expansion vessel charged to 3.5 bar, the expansion
is accommodated in the vessel. This operates on the hydraulic principle; i.e. the expanded water is forced into the expansion
vessel due to the in-line non-return valve. The vessel pressure charge is increased as it accommodates the expanded water, so
that the water is discharged from the vessel when the hot draw off is opened.
Please note that in ALL cases the DIELECTRIC JUNCTIONS MUST be connected to the heater before any other
connection is made. This is very important as they prevent an electrolytic reaction occurring and safeguard the
heater against potential aggressive corrosion.
Only the use of copper pipe is recommended for connection to the heater. If any other material is used it must be able
to withstand 90°C at 7 bar pressure for long periods.
Upon connecting the water heater to the water supply system,
take note of the indicative color markings on the pipes:
BLUE - for cold /in-flowing water,
RED - for hot /out-flowing water.
The mounting of the safety return-valve supplied with the
water heater is obligatory. The safety return-valve must
be installed on the cold water supply pipe, according to
the arrow stamped on its body that indicates the supplied
water direction.
Exception : If local regulations (norms) require the usage
of another protection valve or mechanism (in accordance
with EN 1487 or EN 1489), then it must be bought and
fitted separately. For mechanisms operating in accordance
with EN 1487, the rated operational pressure must be no
more than 0.7 Mpa (7 Bar). For other protection valves, the
pressure at which they are calibrated must be 1 Bar lower
than the one marked on the appliance.
NB- In the circumstances above only, the safety valve
which the appliance is supplied with should not be used.
ATTENTION! Any other type of device should not be fitted
between the protection return valve and the appliance.
ATTENTION! Fixing the safety return-valve to threads
longer than 10 mm should not be attempted as this could
damage the valve.
ATTENTION! The safety valve and the pipe between the
valve and the water heater must be protected from
freezing. During hose draining - its free end must be always open
to the atmosphere (not immerse in water).
The boiler is filled with water by opening the tap on
the cold water supply system and the tap on the hot
water mixing area . After the filling process is complete,
a constant stream of water should flow from the
watermixing faucet. Now you can shut the hot water tap
on the mixing area.
If emptying the water heater, you must first cut off the
power supply.
Draining procedure
UNDER SINKS
1. Switch the boiler off the power supply network.
2. Dismantle the connecting water fittings from the boiler.
3. Disassemble the boiler from its installation place, turn
it so the pipes point to the floor and pour the water in
a bucket or similar, ensuring that all the water drains
out of the boiler