Commissioning
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Commissioning notes for Thermostatic Mixing Valves
The first step in commissioning a thermostatic mixing valve is to check the following:
1. The designation of the thermostatic mixing valve matches the application.
2. The supply pressures are within the valves operating range.
3. The supply temperatures are within the valves operating range.
4. Isolating valves (and strainers preferred) are provided.
If all these conditions are met, proceed to set the temperature as stipulated in the Maintenance
section.
The mixed water temperature at the terminal fitting must never exceed 46˚C.
It is a requirement that all TMV2 approved valves shall be verified against the original set
temperature results once a year. When commissioning / testing is due the following performance
checks shall be carried out:
Measure the mixed water temperature at the outlet.
Carry out the cold water supply isolation test by isolating the cold water supply to the TMV, wait for
five seconds, if water is still flowing check that the temperature is below 46˚C.
If there is no significant change to the set outlet temperature (+/-2˚C or less change from the
original settings) and the fail-safe shut off is functioning then the valve is working correctly and no
further service work is required.
Notes: If there is residual flow during the commissioning or the annual verification (cold water
supply isolation test), then this is acceptable providing the temperature of the water seeping from
the valve is no more than 2˚C above the designated maximum mixed water outlet temperature
setting of the valve.
Temperature readings should be taken at the normal flow rate after allowing for the system to
stabilise.
The sensing part of the thermometer probe must be fully submerged in the water that is to be
tested.
Any TMV that has been adjusted or serviced must be re-commissioned and re-tested in accordance
with the instructions in the Maintenance section.
The installation of thermostatic mixing valves must comply with the requirements of the Water
Supply (Water Fittings) Regulations 1999.