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BSEN1111 BSEN1287
Operating pressure range: High Pressure Low Pressure
Maximum static pressure - Bar 10 10
Flow pressure hot and cold - Bar 0.5 to 5.0 0.1 to 1.0
Hot supply temperature - °C 55 to 65 55 to 65
Cold supply temperature - °C up to 25°C max up to 25°C max
Temperature differential characteristic (TDC) °C 10 10
Table 1 Conditions for normal use
2
SUPPLY CONDITIONS
MODULATING COMBI BOILER
This thermostatic shower valve 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, the 4 L/min flow regulator
provided should be fitted upstream of the thermostatic valve. It should be
fitted in any 15mm compression fitting in the dedicated cold supply pipe.
It is important to choose a compression fitting located in a position which is
accessible after installation and it must be fitted the correct way round for the direction of flow (see
fig2). The regulator can be fitted in either the inlet or outlet side of the compression fitting. If fitting 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 fitting 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 fit a 4 l/min flow regulator in the hot supply. These can be obtained from Customer Care
(A962570NU)
The fitting of isolation valves is required as close as is practicable to the water supply inlets of the
thermostatic mixing valve.
The fitting of strainers is recommended as close as is practicable to the water supply inlets of the
thermostatic mixing valve.
flow direction
through
flow regulator
Figure 2
FLOW RATE
Flow rate L/Min
Pressure - Bar
60
50
40
30
20
10
1.0
2.0
3.0
Flow Curve for A5322 - free outlet
0.1
0
29 l/min
50 l/min
8 l/min
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