MX Options Sequential, Fitting Instructions Manual

Page: 5 / 16

5. SITE REQUIREMENTS
The installation must be in accordance with Water
Regulations Advisory Service (www.wras.co.uk).
Minimum running water pressure: 0.1 bar, but will
operate better at a minimum of 0.5 bar.
Maximum running water pressure: 5 bar. Maximum
static water pressure: 10 bar.
For your shower to perform well you should ensure
that the pressure is as specified and a minimum flow
of 5 litres per minute is available at both hot and cold
inlets.
If the water supply is fed by a gravity system then
the supply pressure should be verified to ensure the
conditions of use are appropriate for the valve.
NOTE: Water Regulations requires the handset to
be ‘constrained by a fixed or sliding attachment so
that it can only discharge water at a point not less
than 25mm above the spill over level of the relevant
bath, shower tray or other fixed appliance’. A double
check valve, or similar, MUST be fitted in the supply
pipe work to prevent back-flow.
The pressure at both the hot and cold water
supplies to the mixer valve should be the same,
and the installer should ensure that the flow is not
affected by other taps elsewhere in the house. It is
very important that for use in any mains pressure
systems an expansion tank and a pressure reducing
valve has been fitted to ensure the pressure does
not exceed 5 Bar.
This should be confirmed by the installation
engineer or competent person before installation.
WATER TEMPERATURE REQUIREMENTS
Maximum hot water temperature = 80°C,
Recommended maximum = 65°C.
Minimum hot water temperature = 55°C
Maximum cold water temperature = 20°C
TEMPERATURE ADJUSTMENT RANGE
The mixed water temperature can be adjusted from
cold through to hot. There is a safety stop preset at a
set temperature of about 38°C. Always test the water
temperature prior to using the shower.
In the event of failure of cold water system, the mixer
valve automatically reduces the flow of hot water to
prevent scalding. It will only operate again once the
flow of cold water has been resumed.
6. SITING OF THE MIXER VALVE
Position the mixer valve so that all controls can be
comfortably reached whilst using the shower.
NOTE: Easily accessible suitable service valves
(complying with Water Regulations Advisory
Service www.wras.co.uk), MUST be fitted as close
as practical to the valve, on the hot and cold water
supplies to the shower as an independent means
of isolating the water supplies should maintenance
or servicing be necessary. These valves should not
restrict the flow.