Materials - gledhill TORRENT DIRECT Design, Installation & Servicing Instructions

DESIGN
3.3

MATERIALS

All the recommendations with regard to the heating systems in this manual are generally based
on BS/EN Standard copper pipework and fittings. However plastic pipework system can be used
in place of copper as long as the:-
(a) The chosen system is recommended for use in domestic heating systems by the
manufacturers and it is installed fully in accordance with their recommendations.
(b) The design criterion of the plastic system is at least equivalent to the use of BS/EN
Standard copper pipework and fittings.
(c) The barrier pipework for these systems is recommended.
3.4 TAPS/SHOWER FITTING
(a) Aerated taps are recommended to prevent splashing.
(b) All types of shower mixing valves can be used as long as both 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 the mixed water outlet such as showers. For
this reason and because the thermostatic showers are now no more expensive than the
manual showers, we strongly recommend thermostatic showers with Torrent. The shower
head provided must also be suitable for mains pressure supplies.
(c) The hot water supply to a shower-mixing valve should be fed where practical directly from
the Torrent or be the first draw-off point on the hot circuit. The cold water supply to a
shower-mixing valve should where practical be fed directly from the rising mains via an
independent branch.
(d) The shower must incorporate or be fitted with the necessary check valves to prevent back-
syphonage protection in accordance with Water Regulations.
(e) The supply of hot and cold mains water directly to the bidet is permitted provided that it is
of the over-rim flushing type and that type 'A' air gap is incorporated.
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