Instructions

ManualsBrandsCaleffi ManualsHeating Supplies3/4" NPT MIXCAL 3-Way Thermostatic Mixing Valve w/ Check Valves (Lead Free)

Function

The thermostatic mixer is used in systems producing domestic

hot water or in radiant panels heating systems. Its function is to

maintain the temperature of the mixed water supplied to the user

constant at the set value when there are variations in the supply

conditions of the incoming hot and cold water.

The valve has been specifically certified to ASSE 1017.

Product range

521A Series Three-way thermostatic mixing valve:

“C” models include inlet check valves “519, 619” models

include outlet adapter. Union thread NPT Male, sizes 1/2”,

3/4”,1”; Union Sweat, size 1/2”, 3/4”, 1”.

Technical Characteristics

· 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

CALEFFI

Adjustable Three-Way Thermostatic Mixing Valve

521 Series

38476.05

Installation, commissioning and servicing instructions

SAFETY INSTRUCTION

This safety alert symbol will be used in this manual to draw attention to safety related

instructions. When used, the safety alert symbol means ATTENTION! BECOME ALERT!

YOUR SAFETY IS INVOLVED! FAILURE TO FOLLOW THESE INSTRUCTIONS MAY

RESULT IN A SAFETY HAZARD.

CAUTION: All work must be performed by qualified personnel trained in the

proper application, installation, and maintenance of systems in accordance

with all applicable codes and ordinances.

ASSE 1017

www.caleffi.c om

Summary of content (8 pages)

PAGE 1
CALEFFI www.caleffi.com 38476.05 Adjustable Three-Way Thermostatic Mixing Valve 521 Series © Copyright 2010 Calef fi Installation, commissioning and servicing instructions Function The thermostatic mixer is used in systems producing domestic hot water or in radiant panels heating systems. Its function is to maintain the temperature of the mixed water supplied to the user constant at the set value when there are variations in the supply conditions of the incoming hot and cold water.
PAGE 2
CAUTION: If the thermostatic mixer 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 mixer connecting pipework is not mechanically over-stressed.
PAGE 3
Operating Principle HOT COLD A thermostatic mixing valve mixes hot and cold water to maintain the desired set temperature of the mixed water at the outlet. A thermostatic element is fully immersed into the mixed water. It contracts or expands causing movement of the piston, closing either the hot or cold inlets, regulating the flow rates entering the valve.
PAGE 4
Use Caleffi series 521 thermostatic mixing valves are designed to be installed at the hot water heater. The Caleffi series 521 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 anti-chill service. They should not be used where ASSE 1070 devices are required. Wherever an scald protection feature is required, Caleffi series 5213 high performance mixing valve need to be installed.
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Application Diagrams Key to symbols 2 1 MIN MAX 7 Safety relief valve HOT COLD HOT/RED COLD/BLUE Isolation and check valve CALEFFI Isolation valve Expansion vessel MIX Filter MIX 4 3 2 Domestic hot water system without recirculation WATER HEATER SUPPLY Radiant panels heating system CALEFFI CALEFFI CALEFFI CALEFFI 10 8 6 4 2 0 10 8 6 4 2 0 10 8 6 4 2 0 10 8 6 4 2 0 10 8 6 4 2 0 CALEFFI COLD MIX 4 3 2 HOT CALEFFI 10 8 6 4 2 0 MIX BOILER Radiant panel loop
PAGE 6
Commissioning After installation, the valve must be tested and commissioned in accordance with the instructions given below, taking into account current applicable standards. 1) Ensure that the system is clean and free from any dirt or debris before commissioning the thermostatic mixer. 2) It is recommended that the temperature is set using a suitable calibrated digital thermometer. The valve must be commissioned by measuring the temperature of the mixed water emerging at the point of use.
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1/2 inch Item Description Item Qty per Valve NPT 3/4 inch Sweat NPT 1 inch Sweat NPT Sweat 521400A, AC 521409A, AC 521500A,AC 521509A,AC 521600A,AC 521609A,AC 521519A,AC 521619A,AC Union Washer 3 Union Nut 1" 3 R50055 Male Tailpieces 3 R31981 NA10002 31901A NA10003 (2 only-'519') 59817A* 59834A* (2 only-'619') Inlet Male Tailpiece with Check Valve"AC" Models only 2 59893A 59904A 59840A 59905A 59894A 59906A Outlet Tailpiece"AC" Models only 1 R31981 NA10002 31901A NA10003
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CALEFFI Caleffi North America, Inc. 3883 West Milwaukee Road Milwaukee, WI 53208 T: 414.238.2360 F: 414.238.