Zone of
Backflow
Risk
30 mm
Minimum
Toilet or Bidet
FC5
Hand Basin
FC3
Bath or Shower
Tray FC3
Electric
Shower
25 mm
Minimum
25 mm Minimum
Hose Retaining Ring fitted and shower fittings fixed
at a suitable height preventing dirty water backflow.
Note! There will be occasions when the hose retaining ring will not provide a suitable
solution for Fluid Category 3 installations, in these instances an outlet double
checkvalve must be tted, this will increase the required supply pressure typically by
10kPa (0.1 bar). Double check valves tted in the inlet supply to the appliance cause
a pressure build up, which affect the maximum static inlet pressure for the appliance
and must not be tted. For Fluid category 5 double check valves are not suitable.
10. Wall xings are supplied for solid wall structures. For other wall structures such
as wall panels alternative xings may be required. A minimum of 2 xing screws
must be used.
11. The position of the shower and shower ttings must provide a minimum gap of
25 mm between the showerhead and the spill over level of any bath, shower tray
or basin and a minimum gap of 30 mm between the showerhead and the spill
over level of any toilet, bidet or other appliance with a Fluid Category 5 backow
risk.
Refer to section: ‘Important Safety Information’ rst.
1. In a domestic installation, the rating of the electricity supplier’s fuse and the
consumer unit must be adequate for the additional demand. All Mira Advance
electric showers are high power appliances. Voltage drop due to local heavy
demand will reduce the shower’s performance.
Electrical
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