Mira Essentials 7.5 Instruction Manual page 11

15. 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 (refer to Figure 1). 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. The inclusion of the Mira DCV-H will increase the required
supply pressure typically by 0.1 bar.
Double checkvalves, fitted in the inlet supply to the appliance, cause a pressure
build-up, which could exceed the maximum static inlet pressure for the appliance.
16. Water flow can be obtained without the electrical power being connected. This allows
the plumbing connections to be tested prior to final connection of the electrical
supply.
17. Avoid layouts where the shower hose will be sharply kinked. This may reduce the life
of the hose.
Electrical
1. In a domestic installation, the rating of the electricity supply company fuse and the
consumer unit must be adequate for the additional demand. As these appliances
are high power units, it is essential to contact your electricity supply company to
ensure that the supply is adequate for the appliance. Voltage drop due to local
heavy demand will reduce the shower's performance.
Hose Retaining
Ring
25 mm Minimum
Spill-over
Level
Figure 1
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