CALEFFI 521400AC, 521419A, 521410A, 521409AC, 521410AC Installation, Commissioning And Service Instructions
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Function
The Caleffi MixCal™ three-way thermostatic mixing valve is used in systems
producing domestic hot water or in hydronic and radiant heating systems.
It maintains the desired output temperature of the mixed water supplied to
the user at a constant set value compensating for both temperature and
pressure fl uctuations of incoming hot and cold water.
Product range
521A Series Three-way thermostatic mixing valve:
“C” models include inlet check valves “419, 519, 619” models include
outlet gauge adapter. Union thread NPT Male, sizes ½”, ¾”, 1”; Union
sweat, size ½”, ¾”, 1”. Press connection ¾”.
Technical Characteristics
Materials: -Body: low-lead brass (<0.25% Lead content)
-Shutter, seats and sliding guides: PPO
-Springs: Stainless steel
-Seals: EPDM
Suitable fl uids: water, 30% max glycol solution
Setting range (outlet temperature): 85–150°F (30–65°C)
Tolerance: ±3°F (±2°C)
Max working pressure (static): 200 psi (14 bar)
Max working pressure (dynamic): 75 psi (5 bar)
Hot water inlet temperature range: 120–185°F (49–85°C)
Cold water inlet temperature range: 39–80°F (3.9–26.6°C)
Maximum inlet pressure ratio (H/C or C/H) for optimum performance: 2:1
Minimum temperature difference between hot water inlet and mixed
water outlet for optimum performance: 27ºF (15ºC)
Minimum fl ow rate to ensure optimal performance: 1.3 GPM (5 L/min)
Lay length (¾” press connection), hot to cold inlet: 3
7
/8”
Maximum fl ow rate: 15 GPM(57 L/min)
Certifi ed to: cUPC listed to ASSE 1017/CSA B125.3
Reduction of Lead in Drinking Water Act compliant: 0.25% Max. weighted
average lead content
Reduction of Lead in Drinking Water Act Certifi ed by IAPMO R&T. Meets
requirements of ANSI/ NSF 372-2011.
MixCal™ adjustable three-way thermostatic mixing valve
521 Series
38476.08
www.caleffi.com
© Copyright 2015 Caleffi
Installation, commissioning and service instructions
Leave this manual for the user.
CAUTION: If the thermostatic mixing valve is not installed, commissioned
and maintained properly, according to the instructions contained in this
manual, it may not operate correctly and may endanger the user.
CAUTION: Make sure that all the connecting pipework is water tight.
CAUTION: When making the water connections, make sure that the
pipwork connecting the MixCal thermostatic mixing valve is not mechanically
overstressed. Over time this could cause breakages, with consequent water
losses which, in turn, could cause harm to property and/or people.
CAUTION: Water temperatures higher than 100ºF (38ºC) can be
dangerous. During the installation, commissioning and maintenance of the
MixCal thermostatic mixing valve, take the necessary precautions to ensure
that such temperatures do not endanger people.
CAUTION: In the case of highly aggresive water, arrangements must
be made to treat the water before it enters the thermostatic mixing valve,
in accordance with current legislation. Otherwise the thermostatic mixing
valve may be damaged and will not operate correctly.
CAUTION: If installed in an ASSE 1017 application, check valves shall
be used.
SAFETY INSTRUCTION
CAUTION: All work must be preformed by qualied personnel trained
in the proper application, installation, and maintenance of systems in
accordance with all applicable codes and ordinances.
This safety alert symbol will be used in this manual to draw attention to safety related
instructions. When used, the safety symbol means ATTENTION! BECOME ALERT!
YOUR SAFETY IS INVOLVED! FAILURE TO FOLLOW THESE INSTRUCTIONS MAY
RESULT IN A SAFETY HAZARD.
COLD
HOT
MIX
COLD
HOT
MIX
Operating principle
The controlling element of the three-way
thermostatic mixing valve is a thermostatic
sensor fully immersed in the mixed water
outlet tube 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 sliding in a cylinder between the hot
and cold water passages. Even when there
are pressure drops due to the drawing off of
hot or cold water for other uses, or variations
in the incoming temperature, the thermostatic
mixing valve automatically regulates the water
flow to obtain the required temperature.
COLD
HOT
MIX
Inlet port check valve detail for 521 “AC” models
Flow curve
Flow should never exceed standards for pipe size and materials.
Kv = 2.6
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 = 3.0
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
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