The Caleffi NA549062A is a 3-in-1 combination hydraulic, air and dirt separator with 2-1/2" ANSI B16.5 Class 150 flanged connections, rated for 80 gpm at a maximum working pressure of 150 psi. It installs between the heat source circuit and the distribution circuits of a hydronic heating or chilled water system to provide hydraulic, air and dirt separation.
Caleffi specifies this series for hydronic heating and chilled water systems containing a primary production circuit with its own pump and a secondary user circuit with one or more distribution pumps, where pump interaction would otherwise cause abnormal variations in circuit flow rates and pressures. Caleffi states the separator should be sized to the greater of the primary or secondary circuit flow rate; this model is rated for 80 gpm. Source: 01178/23 NA, Operating principle and Hydraulic characteristics. The NA-prefix vessel is ASME Section VIII stamped and National Board registered, as stated under Agency approval.
Key Features
Primary/Secondary Hydraulic Decoupling
A low pressure-loss zone lets the boiler circuit and the distribution circuits operate independently, so neither pump interferes with the other. Rated for 80 gpm.
Air Separation to Micro-Bubble Level
A stainless steel or HDPE coalescing element releases entrained air down to micro-bubble size and vents it automatically, achieving 100% removal to micro-bubble level.
Dirt Separation to 5 Micron
The same internal element and the vessel's low-velocity volume capture non-ferrous particulate down to 5 µm (0.2 mil), collecting it clear of the flow stream.
ASME Section VIII Code Stamped
Designed and built to Section VIII, Division 1 of the ASME Boiler and Pressure Vessel Code, National Board registered and CRN registered, stamped for 150 psi working pressure with the ASME U stamp.
Insulation Shell Included
Supplied with a rigid closed-cell expanded polyurethane foam shell under an embossed aluminum cover, rated to 220 °F and suitable for chilled water service without surface condensation.
Technical Specifications
| Product Line | HydroCal |
| Series | NA549 |
| Connection Size | 2-1/2" |
| Connection Type | ANSI Flange |
| Connection Style | Flanged |
| Separation Functions | Hydraulic, air and dirt separation (3-in-1) |
| Rated Flow | 80 gpm |
| Fluid Volume | 4.0 gal |
| Air Separation Efficiency | 100% removal to micro-bubble level |
| Particle Separation Capacity | 5 µm (0.2 mil) |
| Maximum Working Pressure | 150 psi (10 bar) |
| Vessel Working Temperature Range | 32 - 270 °F (0 - 132 °C) |
| Working Temperature Range, Insulated | 32 - 220 °F (0 - 105 °C) |
| Suitable Fluids | Water and non-hazardous glycol solution to 50% |
| Body Material | Epoxy resin painted steel |
| Internal Element Material | 300 series stainless steel |
| Flange Standard | ANSI B16.5 Class 150 RF |
| Drain Valve Connection | 1" NPT Female |
| Insulation | Rigid closed-cell polyurethane foam shell with embossed aluminum cover, included |
| ASME Code Stamp | Section VIII, Division 1; National Board registered; ASME U stamp at 150 psi |
| CRN | Registered |
| Product Weight | 79 lb |
Specifications on this page are taken from Caleffi North America technical brochure 01178/23 NA and the associated submittal and installation documents linked below. Last verified July 2026.
Documentation
Design Resources
Related Products
- Caleffi NA548062A : Hydro Separator 2-1/2" ANSI Flanged, ASME/CRN
- Caleffi NA549062AM : SEP4 2-1/2" ANSI Flanged, ASME/CRN
- Caleffi 501502A : MAXCAL Automatic Air Vent 3/4" NPT Female
- Caleffi NA39589 : Ball Valve 3/4" Female-Female
Frequently Asked Questions
What does the Caleffi NA549062A do in a hydronic system?
The Caleffi NA549062A is a 3-in-1 combination hydraulic, air and dirt separator with 2-1/2" ANSI B16.5 Class 150 flanged connections. It creates a low pressure-loss zone between the boiler circuit and the distribution circuits so that each pump works only against its own loop, which eliminates pump conflict without relying on closely spaced tees. It is rated for 80 gpm and holds 4.0 gallons.
How does the Caleffi NA549062A differ from a plain hydraulic separator?
The NA549062A combines three functions in one vessel: hydraulic separation, air separation to micro-bubble level, and dirt separation to 5 microns. It does not include the magnetic ferrous separation function found on the Caleffi SEP4 series.
What flow rate is the Caleffi NA549062A rated for?
Caleffi rates the 2-1/2" NA549062A at 80 gpm with a fluid volume of 4.0 gallons. A hydraulic separator should be sized to the greater of the primary or secondary circuit design flow rate, not to the pipe size alone.
Is the Caleffi NA549062A ASME code stamped?
Yes. The NA549062A is designed and built in accordance with Section VIII, Division 1 of the ASME Boiler and Pressure Vessel Code, tagged and registered with the National Board of Boiler and Pressure Vessel Inspectors, and stamped for 150 psi working pressure with the ASME U stamp. It is also CRN registered for Canadian projects.
Does the Caleffi NA549062A come with insulation?
Yes. Flanged sizes through 4" are supplied with a rigid closed-cell expanded polyurethane foam shell under an embossed aluminum cover, rated for 32 to 220 °F. The shell also prevents surface condensation in chilled water service.
- Type:
- Hydraulic Separator
- Separation Functions:
- Hydraulic + Air + Dirt
- Product Line:
- HydroCal
- Series:
- NA549
- Connection Style:
- Flanged
- ASME Code Stamped:
- Yes
- CRN Registered:
- Yes
- Insulation Included:
- Yes
- Connection Type:
- ANSI Flange
- Connection Size:
- 2-1/2 inch
- Max Operating Pressure:
- 150 psi
