19
TYPE 2 VALVES
Application
The approved designations for Type 2 Valves
are as follows:
Models
Designation
Mira Element SLT
LP-S, HP-S
Important! The fitting of any flow regulator
will invalidate TMV2 compliance due to the
minimum flow rate requirements. Do not fit
flow regulators in TMV2 applications.
Conditions of use for Type 2 Valves
Operating Pressure
Range
High
Pressure
Low
Pressure
Maximum Static
Pressure (bar)
10
10
Maintained Pressure,
Hot and Cold (bar)
0.5 to 5
0.1 to 1
Hot Supply
Temperature (°C)
55 to 65
55 to 65
Cold Supply
Temperature (°C)
≤25
≤25
Valves operating outside these conditions cannot
be guaranteed to operate as Type 2 Valves.
Recommended Outlet Temperatures
The BuildCert TMV scheme recommends the
following set maximum mixed water outlet
temperatures for use in all premises:
44°C for bath fill, but see notes below;
41°C for showers;
41°C for washbasins;
38°C for bidets.
The mixed water temperatures must never
exceed 46°C.
The maximum mixed water temperature can be
2°C above the recommended maximum set outlet
temperatures.
Note!
46°C is the maximum mixed water
temperature from the bath tap. The maximum
temperature takes account of the allowable
temperature tolerances inherent in thermostatic
mixing valves and temperature losses in metal
baths.
It is not a safe bathing temperature for adults
or children.
The British Burns Association recommends 37
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.
The thermostatic mixing valve will be installed in
such a position that maintenance of the TMV and
its valves and the commissioning and testing of
the TMV can be undertaken.
The fitting of isolation valves is required as close
as practicable to the water supply inlets of the
thermostatic mixing valve.
Commissioning notes for Thermostatic Mixing
Valves
The first step in commissioning a thermostatic
mixing valve is to check the following:
The designation of the thermostatic mixing valve
matches the application.
The supply pressures are within the valves
operating range.
The supply temperatures are within the valves
operating valve.
Isolating valves (and strainers preferred) are
provided.
If all of these conditions are met, proceed to
set the temperature as specified in section:
‘Commissioning’
.
Important!
The mixed water temperature at the
discharge point must never exceed 46°C
Summary of Contents for Element SLT
Page 27: ...27 NOTES...
