Dual control thermostatic mixer
3
SITE REQUIREMENTS
The installation must be in accordance with
Water Regulations and Byelaws.
Running water pressure:
Gravity fed – 0.1 bar min.
1.0 bar max.
Mains fed – 1.0 bar min.
5.0 bar max.
Maximum static water pressure:
Gravity and mains – 10 bar
DO NOT connect the mixer shower to
a gravity hot supply and a mains cold
supply (or vice versa).
For the best performance within the specified
running pressure range a minimum flow of eight
litres per minute should be available to both
inlets.
While the mixer shower is operational (open
outlet), inlet pressures must not be capable of
exceeding 7 bar. For effective operation of the
internal seals, the maximum static pressure must
not be exceeded.
Note:
On sites where the running pressure is
above 5 bar, the use of a suitably sized pressure
reducing valve fitted in the cold mains supply
pipework can provide nominally equal pressures
at the shower mixer.
The pipework should be installed such that the
flow is not significantly affected by other taps
and appliances being operated elsewhere on the
premises.
Note:
Where thermal store systems and
instantaneous gas water heaters are used, if
excessive draw offs take place the boiler may
not be able to maintain an adequate output
temperature. This could result in the shower
temperature becoming noticeably cooler.
Water temperature requirements
Maximum hot water temperature = 80°C
Recommended maximum = 65°C
Minimum hot water temperature = 52°C
Maximum cold water temperature = 20°C
BS 6700 recommends that the temperature of
stored water should never exceed 65°C.
A stored water temperature of 60°C is
considered sufficient to meet all normal
requirements and will minimise the effects of
scale in hard water areas.
Temperature adjustment range
The mixed water temperature can be adjusted
from cold through to a top limit which must
be pre-set during installation with full anti-scald
protection throughout the range (35°C to 40°C)
providing the hot water temperature at the inlet
remains 10°C above the outlet temperature.
Should there be a loss of flow to either incoming
supply then water from the shower will stop or
be reduced to a trickle until both supplies are
restored.
