© Intatec Ltd 2017
6
Check Content
Before commencing remove all components from packaging and check each component with
the contents list.
Ensure all parts are present, before discarding any packaging. If any parts are missing, do not
attempt to install your Inta shower valve until the missing parts have been obtained.
Unvented Mains Pressure System
The drawing shows a typical installation of a shower mixing valve in conjunction with an
unvented hot water system. This type of installation must be carried out in accordance with Part
G of the Building Regulations.
Whilst pressures are theoretically equal (balanced) most unvented hot systems have a pressure
reducing valve on the incoming cold water prior to the hot water storage vessel. This means
that the hot and cold pressures can be significantly different.
Most unvented systems use an inlet manifold located directly after the pressure reducing valve.
It is recommended that the cold supply be taken from one of the outlets of the manifold directly
to the shower as an independent supply.
For systems without a manifold unit after
the pressure reducing valve and where
the cold water supply pressure is
significantly higher than the hot supply
we recommend that a separate
pressure reducing valve is fitted to the
cold supply, as close as possible to the
shower valve and with no draw off
points between it and the shower valve.
Flow regulators are required for
installations where a PRV is not fitted to
ensure simultaneous demand is
accounted for.
PRV
Manifold
Cold Supply
direct from Mains
PRV if
manifold
not used
