5
2
SUPPLY CONDITIONS
BSEN1111
BSEN1287
Operating pressure range:
High Pressure
Low Pressure
Maximum static pressure
10 bar
10 bar
Flow pressure hot and cold
0.5 to 5.0 bar
0.1 to 1.0 bar
Hot supply temperature
55 to 65°C
55 to 65°C
Cold supply temperature
5 to 20°C
5 to 20°C
Temperature differential characteristic (TDC)
10 °C
10°C
Table 1 Conditions of use
Isolation valves MUST be fitted to permit future maintenance. Fitting of strainers is also
recommended.
These should be fitted as close as is practicable to the water supply inlets of the thermostatic
shower valve. See sect.16 for more details.
Both isolation valves & strainers should be installed in an easily accessible location.
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, a 4 L/min flow regulator
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. 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).
flow direction
through
flow regulator
IMPORTANT: Ensure that any old / existing thermostatic mixing valves
(TMVs) that may be fitted in the supply pipes are removed
