User Guide

ManualsBrandsCaleffi ManualsHeating Supplies1" Male Union TankMixer Mixing Valve Body

Function

The Calefﬁ TankMixer

™

520_AX series kit combines a three-way

thermostatic mixing valve with a cold water cross and ﬂexible pipe for

easy installation directly on a typical gas-ﬁred water heater and other

water heaters that now comply with the National Appliance Energy

Conservation Act (NAECA). The TankMixer

™

maintains the desired

output temperature of the mixed water supplied at a constant set

value compensating for both temperature and pressure ﬂuctuations

of the incoming hot and cold water. The mixing valve also features a

thermal shut-off function that operates in the event of a cold water

supply failure at the inlet. Also available as body only, for a wide

variety of separately-sourced end connections, the angle style body

design offers improved ﬂuid dynamics for better performance and

reduces installation labor and materials, eliminating a piping elbow

in typical installations.

The valve has been speciﬁcally certiﬁed to ASSE 1017 and Low

Lead Plumbing Law by ICC-ES.

TankMixer™ water heater tank mixing valve

520 Series

NA10482.01

www.caleffi.com

Product range

52050_AX series kit: Adjustable three-way thermostatic mixing valve, angle body with cold water

cross and ﬂexible connector, connections ¾” NPT female to water heater; ¾” sweat,

press, and NPT male union mix outlet/cold water inlet.

52051_AX series kit: 52050_AX series kit with mixed outlet temperature gauge.

520051A: Adjustable three-way thermostatic mixing valve, angle style body only for ﬁeld installed

connection ﬁttings, source separately, connections 1” male union.

Technical specication

Materials

-Valve and cold water cross bodies:

DZR low-lead brass

-Shutter, seats and slide guides:

PSU

-Springs: stainless steel

-Seals: EPDM

-Adjustment knob: ABS

-Flexible pipe: stainless steel

-Recirc. port plug: low-lead brass

Performance

Suitable ﬂuids: water

Setting range: 5–150° F (35–65° C)

Tolerance: ±3° F (±2° C)

Max. working pressure (static): 150 psi (10 bar)

Max. working pressure (dynamic): 75 psi (5 bar)

Max. hot water inlet temperature: 195°F(90°C)

Max. inlet pressure ratio (H/C or C/H) for

optimal performance: 2:1

Min. temperature difference between hot

water inlet and mixed water outlet for optimal

performance: 27°F(15°C)

Min. ﬂow to ensure optimal performance:

0.5 gpm (2 L/min)

Certifications:

1. ASSE 1017/CSA B125.3, certiﬁed by ICC-ES,

ﬁle PMG-1357.

2. NSF/ANSI 372-2011, Drinking Water System

Components-Lead Content Reduction of Lead in

Drinking Water Act, California Health and Safety

Code 116875 S.3874, Reduction of Lead in Drinking

Water Act, certified by ICC-ES, file PMG-1360.

Summary of content (12 pages)

PAGE 1
NA10482.01 www.caleffi.com TankMixer™ water heater tank mixing valve 520 Series © Copyright 2018 Caleffi Function The Caleffi TankMixer™ 520_AX series kit combines a three-way thermostatic mixing valve with a cold water cross and flexible pipe for easy installation directly on a typical gas-fired water heater and other water heaters that now comply with the National Appliance Energy Conservation Act (NAECA).
PAGE 2
SAFETY INSTRUCTION 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. WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
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CONSIGNE DE SÉCURITÉ Ce symbole d'avertissement servira dans ce manuel à attirer l'attention sur la sécurité concernant instructions. Lorsqu'il est utilisé, ce symbole signifie. ATTENTION! DEVENEZ ALERTE ! VOTRE SÉCURITÉ EST EN JEU ! NE PAS SUIVRE CES INSTRUCTIONS PEUT PROVOQUER UN RISQUE DE SECURITE. AVERTISSEMENT: Ce produit peut vous exposer à des produits chimiques comme le plomb, qui est connu dans l’État de Californie pour causer le cancer, dommages à la naissance ou autre.
PAGE 4
Operating principle The thermostatic mixing valve mixes the hot and cold water at the inlets to maintain constant mixed water at the desired set temperature. The TankMixer™ 520 series point of distribution mixing valve is an angled configuration combined with a flexible hose and cold water cross for easy installation to most water heaters for direct mounting to the universal ¾” male NPT threaded top pipe connections with a variety of outlet connection styles.
PAGE 5
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.
PAGE 6
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.
PAGE 7
Dimensions B B 90 70 110 130 150 ºF 170 D B 190 50 30 B 210 F C E 18” flex hose B Lay length D B B 31/2” F Check valve A C 23/4” 11/2” A E 3 /8” 11/4” 18” flex hose 3 ½” 3 ½” A A 2¾” 1½” 3 /8” 1¼” No temperature gauge. Code A D E F Wt. (lb.) ⁄4" nptf ⁄4" nptm 5 ⁄16" 1 2 ⁄4" 5 5 ⁄8" 1 2 ⁄4" 2.4 ⁄4" nptf ⁄4" press 5 ⁄16" 2 ⁄16" 7 5 ⁄8" 2 ⁄16" 2.4 ⁄4" nptf 2 ⁄16" 5 ⁄2" 2 ⁄16" 2.
PAGE 8
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.
PAGE 9
Application diagrams SYSTEM WITH RECIRCULATION SYSTEM WITHOUT RECIRCULATION MAIN WATER SUPPLY MAIN WATER SUPPLY HOT WATER STORAGE HOT WATER STORAGE Ball valve SYSTEM WITHOUT RECIRCULATION Ball valve with check valve Temperature gauge Pump Expansion vessel T Thermostat Temperature/pressure safety relief valve Safety relief valve Pressure reducing valve MAIN WATER SUPPLY Y-strainer SYSTEM WITH RECIRCULATION, NO TANK CONNECTION MAIN WATER SUPPLY SYSTEM WITH RECIRCULATION, TANK CONNECTION T MAIN
PAGE 10
Troubleshooting Under normal operating conditions the Caleffi TankMixer™ 520 series thermostatic mixing valve will provide a very high level of performance. However, in some circumstances, where the following maintenance schedule is not followed problems may arise. Recommended maintenance schedule: Tests should be conducted regularly to monitor the thermostatic mixing valve performance, as deterioration of performance could indicate that the valve and/or the system require maintenance.
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NOTES 11
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Caleffi North America, Inc. 3883 West Milwaukee Road Milwaukee, WI 53208 T: 414.238.2360 F: 414.238.