Thermostatic bar mixer shower
4
TYPICAL COMMERCIAL INSTALLATIONS
Commercial Gravity Fed Systems
(fig.2)
The mixer shower
MUST
be fed from a cold
water cistern and hot water cylinder providing
nominally equal pressures. There
MUST
be
a minimum of one metre head of water. The
minimum head distance is measured from the
base of the cold water cistern to top of the
shower head.
If valves are gravity fed then supply pressure
should be verified to ensure conditions of use are
appropriate for the valve.
Commercial Unvented Mains Pressure
Systems (
fig.3)
The mixer shower can be installed with an
unvented, stored hot water cylinder.
For systems with no cold water take off after the
appliance reducing valve, it will be necessary to
fit an additional drop tight pressure reducing
valve when the mains pressure is over 5 bar. The
drop tight pressure reducing valve
MUST
be
set at the same value as the unvented package
pressure reducing valve.
NOTE:
An additional expansion vessel may be
required if a second pressure reducing valve is
installed. This does not apply to packages with a
cold take off after the pressure reducing valve to
the cylinder.
TO TAPS
TO TAPS
PRESSURE
REDUCING
VALVE
CHECK
VALVE
E.R.V.
T.R.V.
PRESSURISED
HOT WATER
Pump
Cold water cistern
Vent
Hot
water
cylinder
>50°C
Drain at the lowest point
Drain
Hot water return
Hot water
Cold water to taps
60 2.5°C
Cold feed to Calorifier
<20°C
*Fig.3
*Fig.2
*Diagrammatic view – not to scale.
For illustration purpsoes only.
*Diagrammatic view – not to scale.
For illustration purpsoes only.
