Table 1 Conditions of use for Type 2 valves
Valves operating outside of these conditions cannot guaranteed to perform as type 2.
Approval only applies when the valves are installed without the ow regulators.
6
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 up to 25 °C max up to 25 °C max
Temperature differential characteristic (TDC) 10 °C 10°C
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 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 vis-
ible 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
Isolation valves MUST be tted to permit future maintenance of these products. Strainers are
included with this product inside the check valve housing, see 5.8.
Isolation valves should be tted as close as is practicable to the water supply inlets of the thermostatic
shower valve, in an easily accessible location. See 10 for more details.
These regulators (code A962570NU) can be obtained by contacting fastpart:
2 SUPPLY CONDITIONS
For more information on spare parts why not visit our spare website
www.fastpart-spares.co.uk
fast
t r a p
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