gledhill ElectraMate 2000, Installation And Servicing Instructions

Page: 13 / 44

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Page 13
ELECTR
AMA
TE
2000
1.3 SYSTEM DETAILS
Hot and Cold Water System
Pipe Sizing / Materials
To achieve even distribution of the available supply of hot and cold water, it is
important in any mains pressure system, that the piping in a dwelling should be
sized in accordance with BS 6700.
However, the following rule of thumb guide lines should be adequate for most
smaller property types as long as water pressures are within the recommended
range of 2-3 bar.
1. A 15mm copper or equivalent external service may be sufficient for a
small 1bathroom dwelling (depending upon the flow rate available), but
the minimum recommended size for new dwellings is 22mm (25mm MDPE).
2. The internal cold feed from the main incoming stop tap to the ElectraMate
should be run in 22mm pipe. The cold main and hot draw-off should also be run
in 22mm as far as the branch to the bath tap.
3. The final branches to the hand basins and sinks should be in 10mm and to
the baths and showers in 15mm. (1 metre minimum)
4. We would recommend that best results for a balanced system are
achieved by fitting appropriate flow regulators to each hot and cold
outlet. This is particularly relevant where the water pressures are above the
recommended water pressure range of 2-3 bar. (See Appendix 1 for further
details.
Note: If manifolds (available as an optional extra) are being used suitable flow
regulators are automatically provided in the manifold and do not need to be
provided at each outlet - See Appendix B for further details.
All the recommendations with regard to pipework systems in this manual are
generally based on the use of BS/EN Standard copper pipework and fittings.
However, we are happy that plastic pipework systems can be used in place of copper
internally as long as the chosen system is recommended for use on domestic hot
and cold water systems by the manufacturer and is installed fully in accordance
with their recommendations.
This is particularly important in relation to use of push fit connections when using the
optional flexible hose kits - see 2.2 Installation, Pipework connections.
It is also essential that if an alternative pipework material/system is chosen the
manufacturer confirms that the design criteria of the new system is at least equivalent
to the use of BS/EN Standard copper pipework and fittings.
Taps/Shower Fittings
Aerated taps are recommended to prevent splashing.
Any type of shower mixing valve can be used as long as both the hot and cold
supplies are mains fed. However, all mains pressure systems are subject to
dynamic changes particularly when other hot and cold taps/showers are opened
and closed, which will cause changes in the water temperature at mixed water
outlets such as showers. For this reason and because these are now no more
expensive than a manual shower we only recommend the use of thermostatic
showers with this appliance, even if these are the over the bath/telephone
handset type.
The shower head provided must also be suitable for mains pressure supplies.
1.0 DESIGN
The hot water supply to a shower-mixing
valve should be fed wherever practical
directly from the ElectraMate 2000 or be the
first draw-off point on the hot circuit. The
cold supply to a shower-mixing valve should
wherever practical be fed directly from the
rising mains via an independent branch. The
shower must incorporate or be fitted with
the necessary check valves to provide back-
syphonage protection in accordance with the
Water Regulations.
The supply of hot and cold mains water
directly to a bidet is permitted provided that
it is of the over-rim flushing type and that a
type ‘A’ air gap is incorporated.
Hot and Cold Water System
If the length of the hot water draw off
pipework is excessive and the delivery time
will be more than 30 seconds before hot
water is available at the tap, you may wish to
consider using trace heating to the hot water
pipework such as the Raychem HWAT system.
Please consult Gledhill Technical Department
for further details.
Please note that the ElectraMate 2000 is NOT
suitable for use with a secondary domestic
hot water circulation system.
It is important that the cold water pipework
is adequately separated/protected from
any heating/hot water pipework to ensure
that the water remains cold and of drinking
water quality.