Plumbing - Mira Extreme Thermostatic Installation And User Manual

2.6 A 30mA residual current device (RCD) must be fitted. This may be part of the
consumer unit or a separate unit.

3. Plumbing

3.1 Do not use excessive force when making connections to the flexible hoses or
handset—finger tightness is sufficient.
3.2 Do not solder supply pipework with the Mira Extreme connected. Heat
transmitted through the pipework will melt the inlet manifold.
3.3 The storage cistern should have a minimum storage capacity of 230 litres to
provide adequate showering time. Insufficient storage may result in the pump
being run dry.
3.4 Avoid layouts where the hose will be sharply kinked. This may reduce the life
of the hose.
3.5 No form of flow control should be fitted to the outlet of the appliance.
3.6 Fit non-restrictive (free-flowing) isolating valves to the inlet pipework in an easily
accessible position. These valves will allow the water supply to be turned off
quickly to the Mira Extreme, for maintenance purposes.
3.7 When using surface mounted inlet supply pipework the use of polyethylene
plastic pipe suitable for hot water is recommended to enhance the appearance
of the finished installation. Internal pipe supports (not supplied) should be used
with this type of pipe.
3.8 Only use the Mira showerhead supplied with this appliance.
3.9 If the appliance is installed on a common supply ensure the appliance is the
first take-off from the supply and is not influenced by the operation of any other
appliance.
3.10 If the appliance is installed on a common supply which feeds an adjacent
tap, the maximum static inlet pressure for the appliance will, under certain
circumstances, be exceeded. The action of closing the tap can cause a pulse
in the supply pressure which will result in damage to the appliance. This can
be resolved by the installation of a suitably sized mini expansion vessel, sited
as close as possible to the tap and pressurised to 0.5 bar.
3.11 Long pipe runs and excessive use of 90° elbows will significantly reduce the
head available to supply the Mira Extreme. If the effective head is less than
80 mm then the expected flow rate may not be achieved and air may be drawn
into the hot supply from the vent pipe, causing spluttering and temperature
fluctuations at the showerhead.
13