Installation Manual
5
Operating Principle
The fluid temperature is controlled by a thermostatic three-way mixing valve regulated by a thermostatic
sensor (4) located in the mixed water outlet chamber (3) of the valve. By expanding and contracting, it
continuously ensures a correct proportioning of hot water coming from the boiler, and water returning from
the manifold circuit. The water intake is regulated by an internal cartridge, consisting of a piston (5) that
slides inside a cylinder, located between the hot water flow (1) and the water returning from the circuit (2).
Even if the secondary circuit thermal load or the inlet temperature from the boiler changes, the mixing valve
automatically adjusts the flow rates until it obtains the set secondary flow temperature.
Construction details
Three-way mixing valve unit
The three-way mixing valve unit, containing the piston (5), is construct-
ed of a single casting with connections to the primary and secondary
circuits. Internal channels carry the system return fluid from the primary
return port to the mixing chamber (3), allowing for the unit to be small
and easy to connect.
Reduced head losses
The three-way mixing valve is equipped with a specially designed
shutter with calibrated water orifices. This ensures a high flow rate and
a reduced size, while maintaining accurate temperature control with no
swings due to sudden changes in thermal load.
Removable/replaceable cartridge
The three-way mixing valve is designed so that all fluid regulating
components are contained in a removable internal cartridge. This
allows for easy inspection, cleaning or replacement if required, without
the need to disconnect any piping to the valve body.
Non-sticking materials
The materials used in constructing the mixing valve eliminate potential
sticking due to scale. All functional parts are constructed using a low
friction coefficient material, which ensures performance over time.
Low inertia thermostat sensor
The temperature-sensitive element, the “engine” of the thermostatic
three-way valve has low thermal inertia. Therefore, it can quickly react
to changes in the conditions of inlet pressure and temperature,
shortening the valve response time as the thermal load changes.
Top elbow
The top elbow is constructed of a single casting with ports to connect
the temperature and pressure gauge, purge valve and supply manifold
connection.
Temperature adjustment and locking
The control knob is used to adjust
temperature in a full turn (360°) between
min. and max. It also has tamper protec-
tion for locking the temperature at the set
value.
Adjustment locking
Turn the knob to the required number.
Unscrew the upper screw and remove the
knob. Place the knob back on so that the
internal slot mates with the key on the
valve body. Reinstall the upper screw.
Hydraulic separator with check valve
The hydraulic separator permits hydraulic
separation between the primary and
secondary circuits, preventing flow in one
circuit from interfering with flow in the
other. It can be removed if connecting
directly to a HYDROLINK or hydraulic
separator without a primary pump.
SECONDARY
FLOW
SECONDARY RETURN
PRIMARY
FLOW
PRIMARY
RETURN
2
5 1
3
4
1
2
3
4
L/MIN
1
2
3
4
L/MIN
1
2
3
4
L/MIN
WC
SOGGIORNO
CAMERA
CALEFFI
WC
SOGGIORNO
CAMERA
CALEFFI
Supply manifold
equipped with
flow meters and
balancing valves.
Return manifold
equipped with
shut-off valves.
CALEFFI
CALEFFI
End fittings with automatic
air vent with hygroscopic
cap and drain cock.
30
50
70
90
110
130
150
170
190
210
˚F
10 0
˚C
80
SYSTEM
FLOW
SYSTEM
RETURN
BOILER
FLOW
BOILER
RETURN
1
8
7
6
2
3
4
5
Characteristic components / hydraulic diagram
Item Description Symbol
1 Circulation pump
UPS 15-58 pictured
2 Top elbow with supply temper-
ature and pressure gauge
3 Purge valve
4 Supply temperature and
pressure gage
5 Return temperature gauge
6 Primary circuit shut-off valves
7 Primary circuit hydraulic
separator with check valve
8 Thermostatic three-way mixing
valve with built-in sensor
T
8
SYSTEM
FLOW
SYSTEM
RETURN
BOILER
FLOW
BOILER
RETURN
7
6
5
1
6
T
M
I
N
M
A
X
7
1
2
3
3
2, 4
30
50
70
90
110
130
150
170
190
210
˚F
10 0
˚C
80
60
40
20
0
Characteristic components / hydraulic diagram
Operating principle
The fluid temperature is controlled by a thermostatic
three-way mixing valve regulated by a thermostatic
sensor (4) located in the mixed water outlet chamber
(3) of the valve. By expanding and contracting, it
continuously ensures a correct proportioning of hot
water coming from the boiler, and water returning from
the manifold circuit. The water intake is regulated by an
internal cartridge, consisting of a piston (5) that slides
inside a cylinder, located between the hot water flow (1)
and the water returning from the circuit (2). Even if the
secondary circuit thermal load or the inlet temperature
from the boiler changes, the mixing valve automatically
adjusts the flow rates until it obtains the set secondary
flow temperature.
Operating Principle
The fluid temperature is controlled by a thermostatic three-way mixing valve regulated by a thermostatic
sensor (4) located in the mixed water outlet chamber (3) of the valve. By expanding and contracting, it
continuously ensures a correct proportioning of hot water coming from the boiler, and water returning from
the manifold circuit. The water intake is regulated by an internal cartridge, consisting of a piston (5) that
slides inside a cylinder, located between the hot water flow (1) and the water returning from the circuit (2).
Even if the secondary circuit thermal load or the inlet temperature from the boiler changes, the mixing valve
automatically adjusts the flow rates until it obtains the set secondary flow temperature.
Construction details
Three-way mixing valve unit
The three-way mixing valve unit, containing the piston (5), is construct-
ed of a single casting with connections to the primary and secondary
circuits. Internal channels carry the system return fluid from the primary
return port to the mixing chamber (3), allowing for the unit to be small
and easy to connect.
Reduced head losses
The three-way mixing valve is equipped with a specially designed
shutter with calibrated water orifices. This ensures a high flow rate and
a reduced size, while maintaining accurate temperature control with no
swings due to sudden changes in thermal load.
Removable/replaceable cartridge
The three-way mixing valve is designed so that all fluid regulating
components are contained in a removable internal cartridge. This
allows for easy inspection, cleaning or replacement if required, without
the need to disconnect any piping to the valve body.
Non-sticking materials
The materials used in constructing the mixing valve eliminate potential
sticking due to scale. All functional parts are constructed using a low
friction coefficient material, which ensures performance over time.
Low inertia thermostat sensor
The temperature-sensitive element, the “engine” of the thermostatic
three-way valve has low thermal inertia. Therefore, it can quickly react
to changes in the conditions of inlet pressure and temperature,
shortening the valve response time as the thermal load changes.
Top elbow
The top elbow is constructed of a single casting with ports to connect
the temperature and pressure gauge, purge valve and supply manifold
connection.
Temperature adjustment and locking
The control knob is used to adjust
temperature in a full turn (360°) between
min. and max. It also has tamper protec-
tion for locking the temperature at the set
value.
Adjustment locking
Turn the knob to the required number.
Unscrew the upper screw and remove the
knob. Place the knob back on so that the
internal slot mates with the key on the
valve body. Reinstall the upper screw.
Hydraulic separator with check valve
The hydraulic separator permits hydraulic
separation between the primary and
secondary circuits, preventing flow in one
circuit from interfering with flow in the
other. It can be removed if connecting
directly to a HYDROLINK or hydraulic
separator without a primary pump.
SECONDARY
FLOW
SECONDARY RETURN
PRIMARY
FLOW
PRIMARY
RETURN
2
5 1
3
4
1
2
3
4
L/MIN
1
2
3
4
L/MIN
1
2
3
4
L/MIN
WC
SOGGIORNO
CAMERA
CALEFFI
WC
SOGGIORNO
CAMERA
CALEFFI
Supply manifold
equipped with
flow meters and
balancing valves.
Return manifold
equipped with
shut-off valves.
CALEFFI
CALEFFI
End fittings with automatic
air vent with hygroscopic
cap and drain cock.
30
50
70
90
110
130
150
170
190
210
˚F
10 0
˚C
80
SYSTEM
FLOW
SYSTEM
RETURN
BOILER
FLOW
BOILER
RETURN
1
8
7
6
2
3
4
5
Characteristic components / hydraulic diagram
Item Description Symbol
1 Circulation pump
UPS 15-58 pictured
2 Top elbow with supply temper-
ature and pressure gauge
3 Purge valve
4 Supply temperature and
pressure gage
5 Return temperature gauge
6 Primary circuit shut-off valves
7 Primary circuit hydraulic
separator with check valve
8 Thermostatic three-way mixing
valve with built-in sensor
T
8
SYSTEM
FLOW
SYSTEM
RETURN
BOILER
FLOW
BOILER
RETURN
7
6
5
1
6
T
M
I
N
M
A
X
7
1
2
3
3
2, 4
30
50
70
90
110
130
150
170
190
210
˚F
10 0
˚C
80
60
40
20
0
(H pattern) Hydraulic separator with check valve (item 7)
The hydraulic separator permits hydraulic separation between the primary and secondary circuits,
preventing flow in one circuit from interfering with flow in the other. It can be removed if connecting
directly to a HYDROLINK
TM
or hydraulic separator or buffer tank without a primary pump.