Product Overview

Kv = 1.7
0.1
10
0.023
0.23
0.046
0.069
0.02 0.05 0.2 0.5
0.115
2.3
0.46
0.69
1.15
20 50
∆p (ft of head)
G (l/min) (
gpm
)
23
4.6
6.9
11.5
46
0.01
0.1
0.02
0.03
0.05
1
0.2
0.3
0.5
(psi) (bar)
10
2
3
5
20
1 0
.
1
0
.2
0.5 0
.05
10
2 5 2
0
0.001
0.01
0.002
0.003
0.005
0.1
0.02
0.03
0.05
1.0
0.2
0.3
0.5
Cv = 2.0
9.2
0.092
0.92
0.04
0.4
4
0.004
0.04
0.4
50
115
161
50
70
2.0
5.0
190
70
100 140
M
I
N
M
A
X
7
1
2
3
Index Point
Hydraulic Characteristics
Use
Caleffi TankMixer
™
520 series thermostatic mixing valves are designed
to be installed at the hot water heater. The 520 series valve cannot be
used for tempering water temperature at fixtures as a point-of-use valve.
They are not designed to provide scald protection or chill protection
service. They should not be used where ASSE 1070 devices are
required. Wherever a scald protection feature is required, Caleffi 5213
series high performance mixing valves need to be installed. For safety
reasons, it is advisable to limit the maximum mixed water temperature to
120°F when anti-scald devices are not used at each fixture.
Water heater
As a result of the NAECA, many water heaters now have more insulation
making them physically larger, for the same water capacity, than the
older models. So units with less capacity are installed requiring higher
temperature settings to provide the capacity users were previously
accustomed, requiring mixing valves to temper the water to safe levels.
Caleffi TankMixer
™
520_AX series thermostatic mixing valves with cold
water cross with check valve assembly and large ID flexible connector
will conveniently fit a typical gas-fired water heater and a wide variety of
other water heaters. A recirculation return can be connected at the side
port of the cold water cross.
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”.
The TankMixer
™
520__AX series comes packaged in a kit with
everything needed for fast installation including union fittings and press
connections.
Commissioning
The Caleffi TankMixer
™
520 series thermostatic mixing valve must
be commissioned in accordance with current standards by qualified
personnel using temperature measuring equipment. Caleffi 520510AX,
520516AX and 5210519AX with integral outlet port temperature gauge
provide a time-saving temperature setting process to get close to the
desired temperature. Use of a digital thermometer is recommended
for confirming the final setting of the mixed water temperature. Note:
For models purchased without the outlet temperature gauge, the
temperature gauge adapter with temperature gauge can be separately
purchased and field installed, code NA10056 for 3/4" models.
Temperature adjustment
The temperature is set to the required value by means of the knob with
the graduated scale, on the top of the valve.
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.
Pos. Min. 1 2 3 4 5 6 7 Max.
T (°F) 95 105 115 120 125 132 140 145 150
T (°C) 35 40 45 48 52 56 60 63 65
with: T
HOT
= 158°F (70°C), with: T
cold
= 59°F (15°C), P = 43 psi (3 bar)
Flow should never exceed standards for pipe size and materials.
Body shape
The angle body configuration has improved fluid dynamics for better
performance, and reduces installation labor and materials because the
hot inlet port is in line with the mixed outlet port, eliminating a piping
elbow as required for standard mixing valves. The cold inlet comes in
the side.
14 sweat connections
2 sweat connections (0 with press)
Installation comparison
Traditional
method
TankMixer™
method
14 sweat connections
2 sweat connections (0 with press)
Installation comparison
Traditional
method
TankMixer™
method