Exploded view of tailpiece assembly
The Prestex Model P404UA mixing valve is
optionally provided with angled assemblies in
lieu of the tailpiece arrangement shown above.
This allows the connections of the hot and
cold water supplies to be parallel to the mixed
water outlet for ease of piping layouts.
The assemblies comprise an integral full bore
ball valve and in-line strainer in an angled
housing.
When this arrangement is used, the
requirements for isolation valves and
Y-strainers previously mentioned are regarded
as fulfilled.
Exploded view of angled valve assembly
APPLICATION
The Prestex Model P404 thermostatic mixing
valve has been independently tested by
WRc-NSF against the requirements of BS EN
1287 (Low Pressure-LP) and BS EN 1111
(High Pressure-HP) and certified as complying
with the requirements of the TMV2 Scheme and
is suitable for use in the designations shown in
the table below.
Valves approved for designation for use ‘HP’
only:
- If a water supply is fed by gravity then
the supply pressure should be verified to
ensure the conditions of use are appropriate
for the valve.
The above temperatures are recommended by
the Thermostatic Mixing Valve (manufacturers)
Association as relevant settings for the varying
applications shown. This is the maximum
commissioning temperature but valves may
exceed this by 2°C in use.
The range of available temperature adjustment
is 35°C to 48°C but 46°C is the maximum
recommended mixed water temperature
from a bath tap. The maximum temperature
takes account of the allowable temperature
tolerances inherent in thermostatic mixing
valves and temperature losses in metal baths.
46°C is not a safe bathing temperature for
adults or children
.
The British Burns Association recommends
37°C to 37.5°C as a comfortable bathing
temperature for children. In premises covered
by the Care Standards Act 2000, the maximum
mixed water outlet temperature is 43°C.
•
Unpack the main valve assembly 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.
Exploded view of tailpiece assembly
The Pegler Model P404UA mixing valve is optionally provided with angled assemblies in lieu of
the tailpiece arrangement shown above. This allows the connections of the hot and cold water
supplies to be parallel to the mixed water outlet for ease of piping layouts.
The assemblies comprise an integral full bore ball valve and in-line strainer in an angled housing.
When this arrangement is used, the requirements for isolation valves and Y-strainers previously
mentioned are regarded as fulfilled.
Exploded view of angled valve assembly
•
Unpack the main valve assembly 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.
Exploded view of tailpiece assembly
The Pegler Model P404UA mixing valve is optionally provided with angled assemblies in lieu of
the tailpiece arrangement shown above. This allows the connections of the hot and cold water
supplies to be parallel to the mixed water outlet for ease of piping layouts.
The assemblies comprise an integral full bore ball valve and in-line strainer in an angled housing.
When this arrangement is used, the requirements for isolation valves and Y-strainers previously
mentioned are regarded as fulfilled.
Exploded view of angled valve assembly
APPLICATION
The Pegler Model P404 thermostatic mixing valve has been independently tested by WRc-NSF
against the requirements of BS EN 1287 (Low Pressure-LP) and BS EN 1111 (High Pressure-HP)
and certified as complying with the requirements of the TMV2 Scheme and is suitable for use in
the designations shown in the table below.
Valves approved for designation for use ‘HP’ only:- If a water supply is fed by gravity then
the supply pressure should be verified to ensure the conditions of use are appropriate for the
valve.
Table 2 – Recommended set outlet temperatures
Application
Pressure
Maximum set mixed
water temperature
Shower
HP and LP
41°C
Wash basin
HP and LP
41°C
Bidet
HP and LP
38°C
Bath (Tub)*
HP
44°C
*22mm only
The above temperatures are recommended by the Thermostatic Mixing Valve (manufacturers)
Association as relevant settings for the varying applications shown. This is the maximum
commissioning temperature but valves may exceed this by 2°C in use.
The range of available temperature adjustment is 35°C to 48°C but
46°C is the maximum recommended mixed water temperature from
a
bath tap. The maximum
temperature takes account of the allowable temperature tolerances inherent in thermostatic mixing
valves and temperature losses in metal baths.
46°C is not a safe bathing temperature for adults or children.
The British Burns Association recommends 37°C to 37.5°C as a comfortable bathing temperature for
children. In premises covered by the Care Standards Act 2000, the maximum mixed water outlet
temperature is 43°C.
COMMISSIONING
The valve must be commissioned under normal site system conditions and after establishing
supply conditions with the hot and cold water supplies open, leave the system running to allow
temperatures and pressures to stabilise and be checked.
Prior to commencing commissioning, the following checks should be carried out.
•
The designation of the thermostatic mixing valve matches the application.
•
The supply pressures and temperatures are within the operating range of the valve.
•
Isolating valves and strainers are provided.
If all these conditions are met, proceed to set the temperature as described below.
The Pegler thermostatic mixing valve is supplied factory set at 43°C but the valve may be simply
adjusted after installation.
The mixed water temperature at the terminal fitting must never exceed 46°C
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