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
