Commissioning
Upon completion of the installation, the valve should be tested and commissioned as per the
procedure outlined below or as specified by the local authority.
The following instructions should be read and understood prior to commissioning the Caleffi
521201 NTR thermostatic mixing valve. If, under any circumstances, there are aspects of the
installation/system which do not comply with our requirements or the specifications as listed, the
valve must not be put into service until the installation/system does comply.
1. Ensure that the system is throughly clean and free from debris prior to commissioning the
thermostatic mixing valve.
2. Use a suitably calibrated, accurate digital thermometer to commission temperatures by
measuring the mixed water temperature at the outlet.
3. In accordance with the anti-scald requirements, water installation shall deliver hot water at the
outlet of the sanitary fixtures used primarily for personal hygiene purposes at a temperature not
exceeding 50 °C or as specified by authority having jurisdiction.
4. The temperature at the outlet of each valve must be set taking into consideration any
fluctuations which may occur within the system due to simultaneous demand.
5. Once the supply temperatures are stabilized and the normal operating conditions are
established, the valve can be commissioned. The temperature setting can be adjusted by with
the black plastic adjustment 1/4” hex key, included in the box. Break off from the mounting
bracket. Use the following sequence when commissioning the valve.
• Using a thermometer, measure the temperature of the sink faucet discharge with the hot tap
open, cold tap closed. The temperature should not exceed the temperature allowed by the
applicable standard or code of practice for each state.
• Adjust mixing valve to desired faucet discharge temperature, with provided 1/4” hex key.
• Perform the thermal shut-off test. Isolate the cold water supply to the Caleffi valve and
monitor the mixed water temperature. The outlet flow should quickly cease flowing.
• Restore the cold water supply to the valve and measure and record the outlet temperature
after the mixed water temperature has stabilized. The final temperature found during this test
should not exceed the permitted values ± 2 °C.
• Once the desired temperature has been reached, remove the adjustment key and store in a
6. safe place that can be located if required in the future.
We recommend that the above information is recorded in the Commissioning Report and updated
on the Service Report when any work is performed on the valve.
