The Caleffi 520516AC DL is an AngleMix thermostatic mixing valve with 3/4" Press connections, listed to ASSE 1017 and rated 2.0 Cv. It is used for point of distribution temperature control in domestic hot water and hydronic systems.
Caleffi ships the DL models with a rotation-limiting set screw that caps the mixed outlet at 120 °F to meet ASSE 1070 scald protection. Removing the set screw converts the valve to ASSE 1017 operation with the full 95 - 150 °F range.
Best for water heater and storage tank outlets where a single valve sets the distribution temperature for an entire building, zone or riser.
Specifications sourced from Caleffi North America document 01266_NA. Last reviewed August 2026.
Key Features
ASSE 1017 Listed
Certified for point-of-distribution service, controlling water heater outlet temperature for an entire building or zone.
Thermostatic Element Control
A wax-actuated element responds to outlet temperature changes and repositions the shuttle continuously, holding setpoint without power or controls.
Integral Check Valves
Inlet port check valves are built in, preventing crossflow between hot and cold supplies without additional fittings.
Integral Temperature Gauge
A built-in outlet gauge gives immediate visual confirmation of delivered temperature during commissioning and service.
Low-Lead Brass Construction
Wetted surfaces carry a weighted average lead content below 0.25%, meeting Section 1417 of the Safe Drinking Water Act.
Fast Mechanical Connection
Press tailpieces cut installation time and remove open flame from the job site.
Technical Specifications
| Connection Size | 3/4" |
| Connection Type | Press |
| Configuration | 3-Way |
| Flow Coefficient (Cv) | 2.0 |
| Maximum static operating pressure | 150 psi |
| Maximum dynamic operating pressure | 75 psi |
| Adjustment temperature range | 95 - 150 °F |
| Maximum inlet temperature | 195 °F |
| Flow rate working range | 0.5 - 9 gpm |
| Material | DZR low lead brass |
| Certification | ASSE 1017 and ASSE 1070/ASME A112.1070/CSA B125.70 |
| Factory setting | Limited to 120 °F (ASSE 1070 point-of-use mode) |
| Series | AngleMix |
| Valve Technology | Thermostatic |
| Shipping Weight | 2.5 lb |
Documentation
Design Resources
Related Products
- Caleffi 520510A : AngleMix 3-Way Thermostatic Mixing Valve 3/4" Male NPT w/ Temp Gauge
- Caleffi 520514A : AngleMix 3-Way Thermostatic Mixing Valve 3/4" PEX Crimp w/ Temp Gauge
- Caleffi 520514AC : AngleMix 3-Way Thermostatic Mixing Valve 3/4" PEX Crimp w/ Temp Gauge & Inlet Checks
- Caleffi 520515A : AngleMix 3-Way Thermostatic Mixing Valve 3/4" PEX Expansion w/ Temp Gauge
Frequently Asked Questions
Is Caleffi 520516AC DL listed to ASSE 1017 or ASSE 1070?
Both. Caleffi 520516AC DL is dual listed to ASSE 1017/CSA B125.3 and to ASSE 1070/ASME A112.1070/CSA B125.70. It ships factory-configured in ASSE 1070 point-of-use mode, limited to 120 °F by a rotation-limiting set screw. Backing the screw out converts it to ASSE 1017 point-of-distribution service with adjustment up to 150 °F. Inlet check valves are included as standard, as required by ASSE 1070.
Is Caleffi 520516AC DL approved for point-of-distribution service?
Yes. Caleffi 520516AC DL is listed to ASSE 1017, the standard covering temperature-actuated mixing valves used to control hot water distribution from a water heater or storage tank. ASSE 1017 valves regulate system supply temperature; they are not a substitute for ASSE 1070 point-of-use scald protection at individual fixtures.
What is the temperature adjustment range of Caleffi 520516AC DL?
The adjustment temperature range is 95 - 150 °F. Maximum inlet temperature is 195 °F. Confirm the setpoint against the applicable plumbing code for the installation.
What connection does Caleffi 520516AC DL use?
Caleffi 520516AC DL is supplied with 3/4" Press connections. Other connection styles in the AngleMix family are listed under Related Products.
Does Caleffi 520516AC DL include check valves?
Yes. This model includes integral inlet port check valves, which prevent crossflow between the hot and cold supplies. The C in the product code identifies models supplied with integral check valves.
What is the warranty on Caleffi 520516AC DL?
Caleffi covers this product under its standard two-year limited warranty against defects in material and workmanship from the date of shipment. ZOT Supply is an authorized Caleffi distributor.
- Product Series:
- AngleMix
- Valve Technology:
- Thermostatic
- Application:
- Point of Use
- Application:
- Point of Distribution
- Connection Type:
- Press
- Connection Size:
- 3/4 inch
- ASSE Listing:
- ASSE 1017
- ASSE Listing:
- ASSE 1070
- Flow Coefficient:
- 2.0 Cv
- Integral Check Valves:
- Yes
- Temperature Gauge:
- Yes
