FITTING
Before installation, the system operating
conditions of inlet pressures, hot water
temperature and hot and cold water flow rates
should be determined and confirmed to be
within the expected conditions of normal use
shown in the table below.
Valves must operate in either a high pressure
setting or a low pressure setting. These valves
are not capable of operation with, for instance
hot water supply in one pressure range and
cold water supply in the other pressure range.
In these conditions it is necessary to either
boost one pressure or reduce the other so that
both supplies are within a common pressure
range. If your water supply cannot meet
these conditions then the valve cannot be
guaranteed to operate as a Type 2 valve.
Operating pressures above 5.0 Bar will require
the installation of a pressure reducing valve.
Correct location of the mixing valve is
important to ensure that it is accessible for
commissioning and servicing.
• The valve must be installed with isolation
valves on both the hot and cold water
systems as close as possible to the valve; so
as to allow the valve to be commissioned
and tested correctly.
• The valve is supplied with integral strainers
on the hot and cold water supplies therefore
inline strainers should not be required.
• The valve is fitted with integral “listed” non-
return valve cartridges which command the
water supply, therefore the thermostatic
valve is protected against cross-flow due to
unbalanced line pressures as required by
the Water Supply (Water Fittings)
Regulations 1999.
Assembly Procedure
• Unpack the main valve assembly, remove the
three plastic protection caps and check that
the bores are free of debris and the end
sealing faces are clean.
• Unpack the two tailpieces and confirm
they are complete with union nuts and
compression nuts and olives.
• Locate the sealing gaskets, insert them into
the union nuts against the faces of the
tailpieces and screw the union nuts onto the
valve until a tight seal has been made.
• Remove the compression nuts and olives
from the tailpieces. Locate the inlet filter
screens and insert them into the bore of the
tailpieces up to the shoulder.
• Assemble the valve to the pipework and
ensure the hot and cold water pipes have
full penetration into the tailpiece.
• Tighten the compression nuts ensuring that
the end of the pipe remains in contact with
the filter element.
The highest flow rates will be achieved under balanced pressure conditions, but the pressure at
the valve inlets must be within a ratio of 5:1 under flow conditions and the size and layout of
pipework and fittings must take this into account.
FITTING
Before installation, the system operating conditions of inlet pressures, hot water temperature and
hot and cold water flow rates should be determined and confirmed to be within the expected
conditions of normal use shown in the table below.
BS1287
BSEN1111
Maximum static pressure (bar)
10.0
10.0
Supply pressure hot and cold (bar)
0.1 – 1.0
1.0 – 5.0
Hot supply °C
55 - 65
55 – 65
Cold supply °C
Maximum 25
Maximum 25
Mixed water temperature
Maximum 46
Maximum 46
Valves must operate in either a high pressure setting or a low pressure setting. These valves are
not capable of operation with, for instance hot water supply in one pressure range and cold
water supply in the other pressure range. In these conditions it is necessary to either boost one
pressure or reduce the other so that both supplies are within a common pressure range.
If your water supply cannot meet these conditions then the valve cannot be guaranteed to
operate as a Type 2 valve.
Operating pressures above 5.0 Bar will require the installation of a pressure reducing valve.
Correct location of the mixing valve is important to ensure that it is accessible for commissioning
and servicing.
•
The use of sealing compounds must be avoided since they may intrude into the water
supply and impair the valve performance.
•
The valve must be so installed that it is readily accessible for commissioning and
maintenance when being installed in accordance with TMV2.
•
The valve must be installed with isolation valves on both the hot and cold water systems as
close as possible to the valve; so as to allow the valve to be commissioned and tested
correctly.
•
The valve is supplied with integral strainers on the hot and cold water supplies therefore in-
line strainers should not be required.
•
The valve is fitted with integral “listed” non-return valve cartridges which command the water
supply, therefore the thermostatic valve is protected against cross-flow due to unbalanced
line pressures as required by the Water Supply (Water Fittings) Regulations 1999.
Assembly Procedure
•
The valve body is clearly marked with ‘C’ for Cold and a blue
indicator and ‘H’ for Hot and a red indicator.
The valve must be correctly connected to the respective supplies
• The valve body is
clearly marked with
‘C’
for
Cold
and a
blue indicator and
‘H’
for
Hot
and a red
indicator.
The valve must be correctly connected
to the respective supplies
• The use of sealing compounds must be
avoided since they may intrude into
the water supply and impair the valve
performance.
• The valve must be so installed that it is
readily accessible for commissioning and
maintenance when being installed in
accordance with TMV2.
TMV3 Model P404.indd 3
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