Brochure
MIXCAL™ Adjustable three-way
thermostatic mixing valve
series 521
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 fluctuations of the
incoming hot and cold water.
The valve has been specifically certified to ASSE 1017 and
IAPMO R&T.
Technical specification
Materials: - Body: low-lead brass
(<0.25% Lead content)
- Shutter: PPO
- Springs: Stainless steel
- Seals: EPDM
Setting range: 85–150°F (30–65°C)
Tolerance: ±3°F (±2°C)
Max working pressure (static): 200 psi (14 bar)
Max working pressure (dynamic): 70 psi (5 bar)
Max hot water inlet temperature: 200°F (93°C)
Maximum inlet pressure ratio (H/C or C/H): 2:1
Minimum temperature difference between
hot water inlet and mixed water outlet
for optimum performance: 27°F (15°C)
Certified to: ASSE 1017
Lead Plumbing Law Compliance: (0.25% Max.
weighted average lead content)
- Lead Plumbing Law Certified by IAPMO R&T
Connections: 1/2”–1” NPT male with union
1/2”–1” sweat with union
Dimensions
CALEFFI
Product range
521___A Adjustable three-way thermostatic mixing valve, threaded and sweat connections sizes 1/2”, 3/4”, 1”
521___AC Adjustable three-way thermostatic mixing valve, threaded and sweat connections, inlet port check valves sizes 1/2”, 3/4”, 1”
521519A,(AC) Adjustable three-way thermostatic mixing valve, sweat connections, outlet temperature gage (check valves) size 3/4”
521619A,(AC) Adjustable three-way thermostatic mixing valve, sweat connections, outlet temperature gage (check valves) size 1”
HOT
COLD
MIX
MIN
M
A
X
7
1
2
A
FE
D
B B
C
A
A
A
1/2”
1/2”
3/4”
3/4”
1”
1”
B
2
5/8”
2
5/8”
2
5/8”
3”
2
7/8”
3
1/16”
D
5
15/16”
5
15/16”
5
15/16”
5
15/16”
6
1/4”
6
1/4”
E
3
3/8”
3
3/8”
3
3/8”
3
3/8”
3
11/16”
3
11/16”
F
2
9/16”
2
9/16”
2
9/16”
2
9/16”
2
9/16”
2
9/16”
C
5
1/4”
5
1/4”
5
1/4”
6”
5
3/4”
6
1/8”
Code
521400A
521400A
C
521500A
521500A
C
521600A
521600A
C
HOT
COLD
MIX
MIN
M
A
X
7
1
2
A
FE
D
B B
C
A
A
A
1/2”
1/2”
3/4”
3/4”
3/4”
3/4”
1”
1”
1”
1”
B
2
1/4”
2
7/8”
2
1/2”
2
1/2”
3
1/16”
3
1/16”
3
1/16”
3
1/16”
3
1/4”
3
1/4”
D
5
5/8”
5
5/8”
5
13/16”
7
3/16”
5
13/16”
7
3/16”
6
7/16”
7
13/16”
6
7/16”
7
13/16”
E
3
1/16”
3
1/16”
3
1/4”
4
5/8”
3
1/4”
4
5/8”
3
7/8”
5
1/4”
3
7/8”
5
1/4”
F
2
9/16”
2
9/16”
2
9/16”
2
9/16”
2
9/16”
2
9/16”
2
9/16”
2
9/16”
2
9/16”
2
9/16”
C
4
1/2”
5
3/4”
5”
5”
6
1/8”
6
1/8”
6
1/8”
6
1/8”
6
1/2”
6
1/2”
Code
521409A
521409A
C
521509A
521519A
521509A
C
521519A
C
521609A
521619A
521609A
C
521619A
C
E
D
A
30
50
70
90
110
130
150
170
190
210
∞F
01050/10 NA
Replaces 01050/03 NA
ACCREDITED
ISO 9001 No. 0003
ISO 9001 FM 21654
LOW LEA
D
LOW LEAD
Lead Plumbing Law Certified by IAPMO R&T