Installation
Separate isolation valves must be installed on
the hot and cold water inlet supplies.
To ensure proper performance of the
thermostatic mixing valve, the isolating valves
should preferably be full bore and always be
fully open during operation.
The mixing valve is supplied with filter
elements but it is advisable to additionally
install Y-strainers on the hot and cold water
supplies. The isolating valves and strainers
should be installed as close as practicable to
the location of the mixing valve and should
always be in an accessible location.
Before installation, the hot and cold water
supply systems must be thoroughly flushed
to remove any dirt/debris that may have
accumulated. Failure to do so may adversely
affect the performance of the mixing valve.
CONDITIONS OF NORMAL USE
Table 1
Minimum hot inlet to mixed outlet temperature
differential = 10
o
C
Note: Valves operating outside these
conditions can not be guaranteed by the
Scheme to operate as Type 2 valves.
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.
IMPORTANT INTRODUCTION NOTES
The valves covered by these instructions
have been tested and certified as being in
compliance with BS EN 1111:1999 and BS EN
1287:1999.
Valves operating outside the requirements of
these standards are not covered by the TMV2
Scheme and are not guaranteed to operate as
Type 2 valves.
The installer should be aware of his duty
of care and responsibility in ensuring that
compliance with regulations is maintained.
The valve is not guaranteed to function
correctly to the TMV2 specification unless it
is installed and used in accordance with these
instructions.
Regular servicing is essential to ensure
continued safe operation of this thermostatic
mixing valve. The recommended service
interval is no greater than 12 months.
This Prestex Model P404 in-line thermostatic
mixing valve, available in 15mm and 22mm
sizes, is intended to be fitted into applications
where the reliable control of hot water
temperature is necessary to prevent scalding.
In the event of cold water supply failure, the
product will shut off the hot water supply.
Water Regulations
The Prestex Model P404 mixing valve must be
installed in accordance with the regulations of
the local water company and the Water Supply
(Water Fittings) Regulations 1999.
Approvals
This product is certified under the BuildCert
TMV2 scheme and has been independently
tested by an approved testing laboratory
WRc-NSF and is a Water Regulations Advisory
Scheme (WRAS) approved product and listed in
the Water Fittings and Materials Directory.
IMPORTANT INTRODUCTION NOTES
The valves covered by these instructions have been tested and certified as being in compliance
with BS EN 1111:1999 and BS EN 1287:1999.
Valves operating outside the requirements of these standards are not covered by the TMV2
Scheme and are not guaranteed to operate as Type 2 valves.
The installer should be aware of his duty of care and responsibility in ensuring that compliance
with regulations is maintained. The valve is not guaranteed to function correctly to the TMV2
specification unless it is installed and used in accordance with these instructions.
Regular servicing is essential to ensure continued safe operation of this thermostatic mixing
valve. The recommended service interval is no greater than 12 months.
This Pegler Model P404 in-line thermostatic mixing valve, available in 15mm and 22mm sizes, is
intended to be fitted into applications where the reliable control of hot water temperature is
necessary to prevent scalding. In the event of cold water supply failure, the product will shut off
the hot water supply.
Water regulations
The Pegler Model P404 mixing valve must be installed in accordance with the regulations of the
local water company and the Water Supply(Water Fittings) Regulations 1999.
Approvals
This product is certified under the BuildCert TMV2 scheme and has been independently tested by
an approved testing laboratory WRc-NSF and is a Water Regulations Advisory Scheme (WRAS)
approved product and listed in the Water Fittings and Materials Directory.
Installation
Separate isolation valves must be installed on the hot and cold water inlet supplies. To ensure
proper performance of the thermostatic mixing valve, the isolating valves should preferably be
full bore and always be fully open during operation.
The mixing valve is supplied with filter elements but it is advisable to additionally install
Y-strainers on the hot and cold water supplies. The isolating valves and strainers should be
installed as close as practicable to the location of the mixing valve and should always be in an
accessible location.
.
Before installation, the hot and cold water supply systems must be thoroughly flushed to remove
any dirt/debris that may have accumulated. Failure to do so may adversely affect the
performance of the mixing valve.
CONDITIONS OF NORMAL USE
Table 1
Operating Range High Pressure Low Pressure
Maximum static pressure - bar 10 10
Hot & cold flow pressure - bar 1.0 to 5 0.1 to 1
Hot supply temperature - °C 55 to 65 55 to 65
Cold supply temperature - °C 25 25
Note: Valves operating outside these conditions can not be guaranteed by the Scheme to operate
as Type 2 valves.
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