Product Overview

ManualsBrandsCaleffi ManualsHeating Supplies1" Male Union TankMixer Mixing Valve Body

CALEFFI

ISO 9001 No. 0003

ACCREDITED

ISO 9001 FM 21654

TankMixer

™

water heater tank

mixing valve

520 series

01267/17 NA

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 hot inlet port closes tight

to prevent temperature creep in recirculation applications. 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.

Product range

52050_AX series Kit containing adjustable three-way thermostatic mixing valve, angle body with cold water cross with check valve and ﬂexible

connector pipe ............connections ¾" NPT female to water heater; ¾" sweat, press, and NPT male union mix outlet/cold water inlet

52051_AX series Kit containing adjustable three-way thermostatic mixing valve with mixed outlet temperature gauge, angle body with cold

water cross with check valve and ﬂexible connector pipe

.....................connections ¾" NPT female to water heater; ¾" sweat, press, and NPT male union mix outlet/cold water inlet

520051A Adjustable three-way thermostatic mixing valve, angle style body only for ﬁeld installed connection ﬁttings, source separately

....................................................................................................................................................connections 1" male union

Technical specications

Materials

- Valve body: DZR low-lead brass

- Cold water cross body: DZR low-lead brass

- Shutter, seats and slide guides: PSU

- Springs: stainless steel

- Seals: EPDM

- Adjustment knob ABS

- Large ID ﬂexible pipe: stainless steel

- Recirculation port plug: low-lead brass

Performance

Suitable ﬂuids: water

Setting range: 95–150° 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

Minimum temperature difference between

hot water inlet and mixed water outlet

for optimal performance: 27° F (15° C)

Minimum 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.

Connections

to water heater:

- NPT female union: ¾"

to mix temperature outlet and cold water inlet

- sweat union: ¾"

- press union: ¾"

- NPT male union: ¾"

recirculation inlet port in cross:

- NPT female (plug included) ½"

Summary of content (7 pages)

PAGE 1
TankMixer water heater tank mixing valve ™ CALEFFI 520 series 01267/17 NA ACCREDITED ISO 9001 FM 21654 ISO 9001 No. 0003 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
Dimensions B B 90 70 110 130 150 ºF 170 D B 190 50 30 B 210 F C E 31/2” 18” flex hose B Lay length D B A 3 F 18” flex hose 3 ½” 1 /2” 1½” No temperature gauge. D E F ⁄4" nptf ⁄4" nptm 5 ⁄16" 1 2 ⁄4" 5 5 ⁄8" 2 ⁄4" ⁄4" nptf ⁄4" press 5 ⁄16" 2 ⁄16" 7 5 ⁄8" 2 ⁄16" ⁄4" nptf 23⁄16" 51⁄2" 23⁄16" 520509AX 3 3 /8” 1¼” With temperature gauge.
PAGE 3
Legionella-scalding risk Temperature — exposure time 170 Total burning 160 150 Partial burning 140 130 Safety condition. Maximum exposure time at a given temperature 120 110 0.1 1 10 100 1.000 10.000 Seconds In systems producing domestic hot water with storage, in order to avoid the dangerous infection known as Legionella, the hot water must be stored at a temperature of at least 140°F.
PAGE 4
Body shape Installation The angle body configuration has improved fluid dynamics for better performance, and reduces installation labor and materials because the hot inlet port is in line with the mixed outlet port, eliminating a piping elbow as required for standard mixing valves. The cold inlet comes in the side.
PAGE 5
Replacement parts Replacement body. Meets requirements of NSF/ANSI 3722011. Certified to: ASSE 1017/CSA B125.3, Low lead, by ICC-ES file PMG1360. End connection flexibility: ½", ¾" or 1" npt female or male, press, PEX barb or sweat with or without check valves, separately sourced for field installation. See Caleffi List Price catalog for fitting selection. ASSE 1017 520015A............................................1" male union thread, Cv=2.0 (Kv=1.
PAGE 6
Application diagrams Ball valve 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 MAIN WATER SUPPLY T MAIN WATER SUPPLY
PAGE 7
SPECIFICATION SUMMARIES TankMixer™ 5205__AX series - thermostatic mixing valve with flexible pipe and cold water cross Adjustable thermostatic and pressure balanced mixing valve, certified by ICC-ES to ASSE 1017-2009 and CSA B125.3, approved for point of distribution domestic water systems. Connections ¾" NPT male, ¾" sweat or ¾" press with union tailpieces. DZR low‑lead brass valve body and cold water cross (<0.25% Lead content) certified by ICC-ES file 1360. Meets requirements of NSF/ANSI 372-2011.