Install Instructions

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.
Preset locking
Position the handle to the number required. Unscrew the head screw, pull off the handle and reposition
it so that the handle fits into the internal slot of the knob. Tighten the head screw.
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.