Mira Sport Installation, Operation, Maintenance Manual page 11

1.11. Supply pipework MUST be flushed to clear debris before connecting the Mira
Sport.
1.12. 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. Mira Sport malfunction due to excessive
limescale formation is not covered by the manufacturer's guarantee. Your local
water company will be able to advise the hardness of water in your area.
1.13. 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
backsiphonage (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
buildup, which could exceed the maximum static inlet pressure for the appliance.
1.14. Avoid layouts where the shower hose will be sharply kinked. This may reduce the
life of the hose.
2. Electrical
2.1. 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 Mira
Sports are high power units, it is essential to contact your electricity supply
company to ensure that the supply is adequate for the Mira Sport. 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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