Table 1 Conditions of use
6
MODULATING COMBI BOILER
This thermostatic bath shower mixer is designed for use with modulating
combination boilers.
When installing on a modulating combination boiler it is sometimes
possible for the interaction of a thermostatic valve with the combi to
cause the boiler to cut out and cut in again, with the result that the
water will become alternatively cold and hot. To overcome this, a 4 L/min
ow regulator should be tted upstream of the thermostatic valve.
It should be tted in any 15mm compression tting in the dedicated cold supply pipe.
It is important to choose a compression tting located in a position which is accessible after installation
and it must be tted the correct way round for the direction of ow. The regulator can be tted in either
the inlet or outlet side of the compression tting. If tting in an outlet side, ensure the o-ring is seated
fully in the visible rebate around the edge of the regulator. Use the tip of a small screwdriver or similar
to achieve this. Ensure the tail of the pipe is not fouling the regulator (shorten if required) and do up
the compression tting as normal. In a minority of cases, where the boiler is of a type which stores a
small quantity of very hot water, it may also be necessary to t a 4 l/min ow regulator in the hot supply.
flow direction
through
flow regulator
• A pair of service valves (for isolating both water supplies) MUST be tted below the bath to permit
future maintenance of this product, see sect 23. These should be tted as close as practicable to
the water supply inlets of the mixer & in an easily accessible location.
• The mixers include mesh lters (strainer-washers) and check valves are tted inside the inlets of
these products, see section 20.
These regulators, spares code A962570NU, can be obtained by contacting
Ideal Standard Customer Care or www.idealstandard.co.uk
4 WATER SUPPLY CONDITIONS
BSEN1111
Operating pressure range: High Pressure
Maximum static pressure 10 bar
Flow pressure hot and cold 1.0 to 5.0 bar
Hot supply temperature 55 to 65 °C
Cold supply temperature 5 to 20 °C max
Introduction
These thermostatic shower mixers are manufactured to the highest standards. The mixer is intended to
be installed on high pressure systems (1.0 bar or greater). The mixer has safety features such as cool
body technolgy and temperature limit stop. To make installation easier, fast x wall mounts are supplied.
Ø15mm water supply pipes should be installed at 150mm horizontal centres in the wall, behind a shower
panel or tiled duct wall.
Excessive owrate
To remedy an excessive owrate issue, where the above inlet regulators have not been tted, we
recommend the use of a “shower outlet ow regulator”. This is suitable for installations which exceed 2
bar dynamic pressure.
A 9 litres per minute outlet regulator is available, quote spares code L6749AA.
This regulator can be easily tted between the shower valve outlet and the shower hose
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