Fig.5
Only install the low-pressure
Digital Mixer Processor with a
gravity fed system. Never install
a high-pressure digital mixer
shower with a gravity fed system
Low pressure system – Gravity fed systems (Fig.5)
The low pressure Digital Mixer Processor unit MUST be fed from a cold water cistern and
hot water cylinder providing nominally equal pressures.
For the operation of the shower only, it is recommended that the cold water storage cistern
is capable of holding at least 114 litres (25 gallons). Where other hot and cold outlets are
likely to be in use simultaneously, the storage capacity should be increased to 228 litres (50
gallons) in accordance with BS EN 806.
IMPORTANT: Pipework layouts and connections MUST be such that other draw-offs will
not effect water supplies to the digital mixer processor unit, shared supplies may lead to air
locking or water starvation. It is therefore best practice to have independent hot and cold
supplies to the digital mixer processor unit.
If the hot water draw-off is incorrectly positioned, air may be drawn into the hot supply
from the vent pipe causing spluttering, temperature fluctuations at the showerhead.
Any draw-off for the processor unit must point DOWN (to avoid air-lock problems) and
must be BELOW the vent pipe tee.
Failure to correctly position the draw-off will result in poor performance or other problems
with the Digital Mixer Processor unit.
Typical suitable
installations
IMPORTANT: The minimum head for
operation of the Digital Mixer Processor
unit is 100 mm. For correct operation the
Digital Mixer Processor unit must not be
sited more than 5 metres away from the
hot water cylinder.
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