Install Instructions

Plumbing installation

Before installing the LEGIOMIX electronic mixing valve, pipes must be ﬂushed to prevent impurities in

the water from affecting performance. Always install strainers of appropriately sized capacity at the inlet

from the water main supply. Calefﬁ LEGIOMIX electronic mixing valves must be installed as shown be-

low, conforming to applicable codes, and installed either vertically or horizontally, but the actuator must

never be oriented upside down.

The mixing valve body indicates with arrows, hot water inlet- red, cold water inlet - blue.

∞

Check valve

In systems with inlet pressure ﬂuctuations, check valves should be installed to prevent backﬂows, as

is shown in the application diagrams. Check valves, code NA10366 (for 1” and 1¼” LEGIOMIX) and

NA10367 (for 1½” and 2” LEGIOMIX

)

may be used.

Commissioning

Due to the special purpose for electronic mixing valves, commissioning in accordance with current

regulations and by qualiﬁed personnel using suitable instruments is required. Check that the hot and

cold water supply pressures are within operating limits of the mixing valve, see technical speciﬁcations.

Check the temperature of the hot water coming from storage, greater than or equal to 140°F (60°C).

Record all parameters settings and measurements taken in the installation log book.

Maintenance

During service, regularly monitor the performance of the LEGIOMIX electronic mixing valve since any

loss of performance may indicate maintenance is needed for the valve or the system. If the temperature

of the mixed water is found the have changed signiﬁcantly compared to previous recordings, refer to

installation and commissioning sections. The following check points are recommended periodically, at

least every 12 months or more frequently, to ensure that the valve continues to deliver optimum levels

of performance:

1) Check and clean the ﬁlters installed in the system.

2) Check that any check valve installed at the inlet of the LEGIOMIX electronic mixing valve is functioning

correctly, and there are no leaks caused by dirt.

3) The internal components of the valve can be descaled by immersing in a suitable descaling ﬂuid.

4) Follow commissioning procedure again after maintainable components have been checked.

5) Record all operations conducted on system log book.