Installation
Before installing a Caleffi TankMixer™ 520 series three-way thermostatic mixing valve,
the system must be inspected to ensure that its operating conditions are within the range of the
mixing valve, checking, for example, the supply temperature, supply pressure, etc.
Systems where the 520 series thermostatic mixing valve will be installed must be drained and
cleaned out to remove any dirt or debris which may have accumulated during installation.
The installation of appropriately sized filters at the inlet from the main water supply is always
advisable.
Caleffi TankMixer™ 520 series thermostatic mixing valves must be installed by qualified
personnel in accordance with the diagrams in this brochure, taking into account all current
applicable standards.
Caleffi TankMixer™ 520 series thermostatic mixing valves can be installed in any position,
either vertical or horizontal, or upside down.
The following are shown on the thermostatic mixing valve body:
- Hot water inlet, color red and marked “HOT”.
- Cold water inlet, color blue and marked “COLD”.
- Mixed water outlet, marked “MIX”.
Locking the setting
Position the handle to the number required with
respect to the index point. 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.
Check valve
In systems with thermostatic mixing valves, check valves should be installed to prevent
undesired backflow. The TankMixer™ 520_AX series mixing valves are supplied complete
with a check valve on the cold water tee outlet port to the mixing valve. As a convenience for
easier installations, the TankMixer™ 520051A body only can be field-installed with separately
purchased union tailpieces for
½”,
¾” or 1” npt female or male, press, PEX barb or sweat with
or without check valves (for the hot and cold inlet ports).
MIN
MAX
7
1
2
3
Index Point
