Mira Platinum Installation Manual page 14

2. Mains Pressurised Instantaneous Hot Water Shower, Heated
from a Thermal Store
Caution! Risk of product damage. Do not fit the Mira Digital Mixer - PUMPED
VALVE with Mains Pressurised Systems.
Packages of this type, fitted with a tempering valve can be used. A drop type
pressure reducing valve must be fitted (and regularly maintained) if any form
of backflow prevention device is fitted, e.g. non-return valve, PRV. This will
ensure that excess expansion or pulse pressures do not damage the product or
the plumbing system. The expansion vessel may already be fitted externally or
internally within the thermal store (check with thermal store manufacturer).
3. Gravity Fed Showers
Caution! Risk of product damage. Do not fit the Mira Digital Mixer - HIGH
PRESSURE/COMBI VALVE with Gravity Fed Systems.
Cistern
Minimum 230 litres
The shower control must be fed from a cold water storage cistern and a hot
water cylinder providing nominally equal pressures. Pipework layouts and
connections must be such that other draw-offs will not effect water supplies to the
shower. It is therefore best practice to have independent hot and cold supplies to
the Low Pressure (pumped) Digital Mixer Valve.
Digital Mixer
Valve
HOT
COLD
90°
30° - 60°
Air Separation
14
Mira Platinum
Shower Fittings
100 mm from the lowest level of
water in the tank
Mira Platinum
Shower Fittings