Submittal Sheet

COLD
HOT
MIXED
1
4
2
3
5
32
60
80
100
120
140
160
Kills bacteria instantly
Kills 90% of bacteria in 2 minutes
Kills 90% of bacteria in 2 hours
Optimum temperature
for growth of bacteria
Surviving bacteria inactive
Construction details
Anti-scale materials
The material used in the construction of the Caleffi AngleMix 520 series
thermostatic mixing valve reduces jamming caused by lime deposits.
All the working parts such as shutter, seats and slide guides are made
of a special anti-scale polymer material, with a low friction coefficient,
assuring long term performance.
Temperature setting and locking
The control knob permits temperature setting between minimum and
maximum in one turn (360°). It also has a tamper-proof system to lock
the temperature at the set value.
Thermal shut-off
In the event of accidental cold water supply failure, the shutter seals
off the hot water passage, thus preventing the delivery of mixed
temperature water. This is only guaranteed when there is a minimum
temperature difference between the inlet hot water and the mixed
temperature water delivery of 18° F. Additionally, the tight closing hot
inlet port prevents temperature creep in recirculation applications.
Check valve
In systems with thermostatic mixing valves, check valves must be
installed to prevent undesired backflow. As a convenience for easier
installations, the AngleMix 5205__AC series mixing valves are supplied
complete with a check valve in the hot and cold inlet ports.
Operating principle
The thermostatic mixing valve mixes the hot and cold water at the
inlets to maintain constant mixed water at the desired set temperature.
A thermostatic sensor (1) is fully immersed in the mixed water outlet
passage (2) which, as it expands or contracts, continuously establishes
the correct proportion of hot and cold water entering the valve. The
regulation of these flows is by means of a piston (3) sliding in a cylinder
between the hot and cold water passages. This controls the passage of
hot (4) or cold (5) water at the inlet. If the inlet temperature or pressure
changes, the internal element automatically reacts to restore the set
temperature at the outlet. The AngleMix 520 series point of distribution
mixing valve is an angled configuration for easy installation to most water
heaters for direct mounting to the top pipe connections.
Thermal disinfection
The diagram shows the behavior of the bacteria Legionella Pneumophila
when the temperature conditions of the water in which it is containedvary.
In order to ensure proper thermal “disinfection”, the values must not be
below 140° F.
110
120
130
140
150
160
170
0.11 10 100 1,000 10,000 Seconds
Partial burning
To tal burning
Safety condition.
Maximum exposure time
at a given temperature
Temperature — exposure time
Legionella-scalding risk
In systems producing domestic hot water with storage, in order to
avoid the dangerous infection known as Legionella, the hot water must
be stored at a temperature of at least 140° F. At this temperature it
is certain that the growth of the bacteria causing this infection will be
totally eliminated. At this temperature, however, the water cannot be
used directly.
As shown on the diagram opposite, temperatures of more than 120° F
can cause burning very quickly. For example, at 130° F partial burning
will occurr in approximately 30 seconds, while at 140° F partial burning
will occurr in approximately 5 seconds. The time may be reduced by 50
percent or more for children and elderly people.
In view of the above, it is necessary to install a thermostatic mixing valve
which can:
- reduce the temperature at the point of use to a value lower than that
of storage and suitable for sanitary users. For safety reasons, it is
advisable to limit the mixed water temperature to 120° F when point-
of-use anti-scalding thermostatic mixing valves are not present at all
fixtures.
- maintain the temperature constant when the incoming pressure and
temperature conditions vary.