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The fittings covered by these instructions should be installed in
accordance with the Water Regulations published in 1999*.
Ideal Standard strongly recommends that these fittings are installed by
a professional fitter.
*A guide to the Water Supply (Water Fittings) Regulations 1999 and the Water Byelaws 2000, Scotland is published by WRAS
(Water Regulations Advisory Scheme) Fern Close, Pen-y-Fan Industrial Estate, Oakdale, Newport, NP11 3EH.
ISBN 0-9539708-0-9
INTRODUCTION
1
These thermostatic shower mixers are designed to be installed on normal UK low pressure storage
tank fed systems, unvented high pressure systems, modulating instantaneous water heaters or
modulating combination (combi) boilers. They are suitable for all pumped applications.
WATER REGULATIONS
Hot and cold water supply pressures must be reasonably balanced and from a common source - both
from storage or both from a supply pipe. (IRN 101). The mixers will function within specification on
unequal pressures up to a ratio of 5 : 1, but it is not recommended that the cold supply be connected to
the rising main and hot to the tank fed supply as the pressure differential is likely to exceed the 5:1
ratio. (See table 1) The minimum pressure for correct operation is 0.1 bar (1m head). Pressure head
is measured as the vertical distance between the bottom of the cold water storage tank which feeds
the hot water system and the highest point on the shower spray plate. When installing with a shower
pump the use of a secondary tapping from the cylinder is highly recommended.
Figure 1 shows the various methods of connecting the hot water pipe to the cylinder - the most
preferred on the left and the least preferred on the right.
The fitting should be so installed as to be readily accessible for examination, repair, replacement or
operation. (IRN 111).
The temperature of the hot water must not exceed 85ºC but the installer’s attention is drawn to code of
practice BS 6700 which recommends that stored hot water should normally never exceed 65ºC. For
correct operation of the valve, a minimum of 55ºC is required.
most preferred solution
least preferred solution
Essex flange 22mm
Surrey flange
22mm outlet
From vertical
expansion pipe
22mm pipework
Figure 1
Preferred arrangements for cylinder tapping
From underside of
expansion pipe off-set
at 60 22mm pipeworkº
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