Manual mixer shower
5
Mains pressurised thermal store systems
(fig.4)
Packages of this type, fitted with a tempering
valve (blender valve) can be used. A drop tight
pressure reducing valve
MUST
be fitted if the
supply pressures exceed 5 bar running.
An expansion vessel, shown in
fig.4
,
MUST
be
fitted and regularly maintained, to prevent the
unit being damaged by excess pressures. This
may already be installed externally or internally
within the thermal store (check with thermal
store manufacturer).
Gravity fed systems
(fig.5)
The shower control
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 the top of the
sprayhead.
If required, a twin impellor pump may be
installed to increase the water pressure .
*
(diagrammatic view – not to scale)
*Fig.4
*
(diagrammatic view – not to scale)
*Fig.5
1m minimum
Hot water
cylinder
Mixer valve
Service
valves
Cold supply
Hot supply
Alternative
supply
Cold
water
mains
supply
Drain
valve
Gate
valve
Other
draw-offs
Stopvalve
Cold
water
cistern
