Install Instructions

Principle of Operation
A thermostatic mixing valve mixes hot and cold water in such a way as to maintain a constant set
temperature of the mixed water at the outlet. A thermostatic element is fully immersed into the mixed
water. It then contracts or expands causing movement of the piston, closing either the hot or cold
inlets, regulating the flow rates entering the valve.
If there are variations of temperature or pressure at the inlets, the internal element automatically reacts
attempting to restore the original temperature setting.
Thermal
Shutoff
In the event of a failure
of either the hot or cold
supply, the piston will
shut off, stopping water
discharging from the
mixed water outlet.
The Caleffi 5230 and
5231 series mixing
valves require a
minimum temperature
differential from hot
inlet to mixed water
outlet of 20°F (11°C)
to ensure the correct
operation of the
thermal shutoff feature.
Softened water use is
highly recommended
as the warranty is
voided if used on water
with hardness greater
than 10 grains.
Recommended
flowrates for
temperature stability:
Flow curves
10
0.1
1
0.2
0.3
0.5
20 50
p (psi)
10
2
3
5
20
0.1
1
0.2
0.3
0.5
(psi) (bar )
10
2
3
5
20
10 2 5 2
0
0.01
0.1
0.02
0.03
0.05
1.0
0.2
0.3
0.5
4
0.4 0.4
4
0.04
0.4
5
0
10
0
100 200
1-1/4"
1-1/2"
2"
4.4
8.8
40
70
Min. Max.
(gpm) (gpm)
10
0.1
1
0.2
0.3
0.5
20 50
p (psi)
G
(l/min) (
gpm
)
10
2
3
5
20
0.1
1
0.2
0.3
0.5
(psi) (bar )
10
2
3
5
20
10
2 5 2
0
0.01
0.1
0.02
0.03
0.05
1.0
0.2
0.3
0.5
4
0.4 0.4
4
0.04
0.4
5
0
10
0
100 200
G
(l/min) (
gpm
)
1”
1/2” - 3/4”
1”
224
Min.
Max.
(gpm) (gpm)
1" 7
7.6
13
14.2
Cv
1-1/4”
1-1/2”
2”
HOT
MIXED
COLD