e. If the supply to the mixer fittings (other than a dual outlet type) is not taken
from the balanced supply the system will become over pressurized and cause
the pressure relief valve to discharge. Over time this could also cause the
premature failure of the appliance itself which will not be covered by the
warranty
f. In larger properties with a number of bathrooms/en-suites and long pipe runs
we would recommend that the balance cold supply is provided with its own
pressure reducing valve and is not taken from the balanced cold connection on
the combination valve. In this case it will also be necessary to fit a small expansion
vessel on the balanced cold water system to accommodate the pressure rise caused
by the increase in temperature of the balanced cold water.
SHOWER FITTINGS
Any type of shower mixing valve can be used as long as both the hot and cold supplies
are mains fed. However, PRESSURE COMPENSATING shower mixing valves are proven
to give better control when more than one fitting are open simultaneously and are
therefore STRONGLY RECOMMENDED.
Thermostatic versions are preferable.
PIPE LAYOUT
In all mains pressure installations it is important to remember that the incoming cold
supply must be shared between all terminal fittings. It is important that a 22mm
supply is brought to the appliance and a 22mm take-off is continued at least to the
bath. If there are two baths, 28mm pipework should be considered. Smaller pipework,
or the use of flow restrictors, should be considered for other outlets so as to balance
the water available. In any event the distribution pipework should generally be in
accordance with BS6700.
25mm MDPE
INCOMING
SUPPLY
M
DC
DC
DC
TO
EXTERNAL
TAP
SINK
WM or DWM
WHB
W.C.
DC
DC
SH
WHB
WC
BATH
SCV
SCV
22
15
22
15
P&T
ERV/NRV
PRV
DCV
Note:
Cold supplies to single taps taken from the mains cold water system
Cold supplies to mixer taps to be taken from the balanced cold water connection on the combination valve
PLASTIC PIPEWORK
This appliance is suitable for use with
plastic pipework as long as the material
is recommended for the purpose by the
manufacturer and is installed fully in
accordance with their recommendations.
SECONDARY HOT WATER CIRCULATION
The two largest indirect models are fitted with
a secondary return tapping as standard. This
tapping may also be fitted on other models
on request. If fitted, an extra expansion vessel
may be necessary. A non-return valve MUST be
FITTED near the return connection. No valve
or terminal fitting should be installed between
the non return valve and the cylinder.
Page 9
INSTALLATION
Xs
tr
eam
