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1.13. To comply with Bye-law 17 which refers to shower hose connections, a hose
retaining ring is supplied to prevent the handset from dropping below the
spillover level of the bath or shower, which could lead to contamination from
back-siphonage.
The supplied hose retaining ring should meet the great majority of user
requirements for shower installations with flexible outlet fittings. However,
there will be occasions when the hose retaining ring will not provide a
suitable solution. In these instances an outlet double checkvalve, e.g. the
Mira DCV-H, must be fitted. Double checkvalves, fitted in the inlet supply
to the appliance are not recommended as they cause a pressure build-up,
which could exceed the maximum static inlet pressure for the appliance.
1.14. When installed in very hard water areas (above 200 ppm temporary hardness)
your installer may advise the installation of a water treatment device, to reduce
the effects of limescale formation. Appliance malfunction due to excessive
limescale formation is not covered by the manufacturer's guarantee. Your
local water company will be able to advise of the hardness or water in your
area. Where relevant the requirements of Bye-law 91 must be met if a water
treatment device is fitted.
1.15. Avoid layouts where the hose will be sharply kinked. This may reduce the life
of the hose.
1.16. Water flow can be obtained, using the available gravity head, without the
electrical power being connected. This allows the plumbing connections to be
tested prior to final connection of the electrical supply.
1.17. Long pipe runs and excessive use of 90° elbows will significantly reduce
the available head to supply the appliance. The following table should
be completed to ensure that adequate head is available for any given
application.
12
Hose Retaining
Ring
25 mm Minimum
Spill-over
Level
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