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2.6
Position the riser rail close to the
heater, not necessarily on the same wall
(but bear in mind paragraph 2.4) so that, in
its highest parked position the handset is
no more than 610mm (24") above the
bottom of the heater, and in its lowest
position it is no lower than 305mm (12")
below the heater (see Fig. 2.6).
2.7
Remember that if the handset can
reach to within 25mm (1 ") of the spillover
level of the bath, shower tray, wash basin,
WC or bidet, then to prevent the possibility
of back-siphonage of used water, (Water
'i'
Bye-Law 17) you must either:
(i)
install a hose-restraining ring
Fig. 2.6).
(ii) fit a combined vacuum breaker-and
check valve unit between the hose
and shower heater.
(iii) fit a double-check valve in the
pipework to the shower.
2.8
Decide from which direction your pipe
Will
enter the shower heater. There is a
choice of top, bottom, rear or side. See
Section Four for details.
2.9
Ensure there are no services such as
gas, water pipes, electrical or telephone
cables beneath the surface of the wall
before drilling. Special handheld testers are
available from hardware stores.
2.10
The water connection to the shower
heater should be made using standard
15mm outside diameter copper pipe or
Hacksaw
Figure 2.10
Figure 2.11
stainless steel
The ends should be
cut square and be free from internal and
extemal burrs and deep scratches. Where
possible, use a pipecutter and not a saw, to
prevent saw chippings entering the pipe.
2.11
Before making the final water
connections to the shower heater, the pipe
work MUST BE FLUSHED THOROUGHLY
to remove brick dust, swarf etc. which
could severely damage the shower itself
Fig. 2.11).
2.12
It is recommended that a Water
Research Council-listed servicing valve is
fitted in the water supply pipe to the
shower. This is to allow the shower heater
to be serviced without turning off the water
supply to other appliances.
Things you must not do:
-.
...
-
._ . . . . .
~
2.13
Do not use plumber's paste on any
jOints as this may damage the shower.
2.14
Do not use a blow-torch or other
form of heat close to the shower heater as
this may damage the non-metallic parts.
2.15
Do not use excessive force, and do
ensure adequate support, when making
connections.
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