10
Commissioning
After installation, the valve must be tested and commissioned in accordance with the instructions
given below, taking into account current applicable standards.
1) Ensure that the system is clean and free from any dirt or debris before commissioning the
thermostatic mixing valve. Be sure water hardness is less than 10 grains.
2) It is recommended that the temperature is set using a suitable calibrated digital thermometer.
The valve must be commissioned by measuring the temperature of the mixed water at the outlet.
3) The maximum outlet temperature from the valve must be set taking account of the fluctuations
due to simultaneous use. It is essential for these conditions to be stabilized before commissioning.
4) Adjust the temperature using the adjusting knob on the valve. For safety reasons, it is advisable
to limit the maximum mixed water temperature to 120°F in domestic hot water systems.
Maintenance
Service tests should be carried out regularly to monitor the mixing valve performance, as deterioration
of performance could indicate that the valve and/or the system require maintenance. If, during
these tests, the temperature of the mixed water has changed significantly in comparison with the
previous test, the details given in the installation and commissioning sections should be checked
and maintenance carried out.
The following aspects should be checked regularly to ensure that the optimum performance levels
of the valve are maintained. Every 12 months at least, or more often if necessary.
1) Check and clean the system filters.
2) Check that any non-return valves positioned upstream of the Caleffi valve are operating correctly,
without problems caused by impurities.
3) Limescale can be removed from internal components by immersion in a suitable de-scaling
fluid.
4) When the components which can be maintained have been checked, commissioning should
be carried out again.
