TFC Group TMV - Manual (Page 3)

Thermostatic mixing valves
TFC GROUP LLP Tower House, Vale Rise, Tonbridge, Kent TN9 1TB
Tel: 01732 351680 Email: [email protected] Web: www.tfc-group.co.uk
Table 1: Conditions for normal use
Operating pressure range Low pressure High pressure
Maximum static pressure-bar 10 10
Flow pressure, hot and cold-bar 0.2 to 1 1 to 5
Hot supply temperature -°C 52-65 52-65
Cold supply temperature -°C 5 to 20 5 to 20
Minimum Temperature Differential
Between Mixed Temperature &
Either Supply
1 0°C 1 0°C
COMMISSIONING
Since the installed supply conditions may differ from those used in testing and setting the valves
during final inspection and a valve may have several designations, it is necessary to reset the mix
temperature. The following procedure should be used after ensuring:
a) The designation of the thermostatic mixing valve matches the intended application (i.e. if a
shower is to be supplied at 2 bar then the valve must have a HP-S designation).
b) The supply pressures match those for which the valve has been approved, see table1 and
valve details.
c) The supply temperatures are such that they are within the permitted range (see table1) and
comply with guidance information on the prevention of legionella.
Note:- If the supply conditions are not within the parameters for normal use the valve may still
be suitable, but individual engineers must carry out their own risk assessment and satisfy
themselves that the units are still suitable for use.
Adjust the mixed water temperature in accordance with table 2, the method of adjustment is
covered in the section temperature setting.
Table 2: Mixed Water Temperature
Application Abbreviated Designation Mixed water temperature °C
Bidet -HP-B,BE,-LP-B,BE 38 max
Shower -HP-S,SE,-LP-S,SE 41 max
Washbasin -HP-W,WE,-LP-W,WE 41 max
Bath (44 °C fill) -HP-T44,-LP-T44 44 max
Bath (46 °C fill)
-HP-T46,-LP-T46 46 max
Note 1: For washbasins, washing under running water is assumed.
Note 2: Bath fill temperatures of more than 44°C should only be available when the bather is
always under the supervision of a competent person (e.g. nurse or care assistant)
Note 3: A thermostatic mixing valve having multiple designations (i.e. it is capable of satisfying
the requirements of this specification for more than one application) should be reset on site to
suit be designation required.
The following set of tests should be carried out.
1) Record the temperature of the hot and cold water supplies.
2) record the temperature of the mixed water at the largest draw-off flow rate.
3) record the temperature of the mixed water at a smaller draw-off rate, which shall be
measured.
4) Isolate the cold water supply to the mixing valve and monitor the mixed water temperature.
5) record the maximum temperature achieved as a result of (d) and the final temperature.
6) record the equipment, thermometer etc. used for the measurements.