The Caleffi NA549300AM is a SEP4 unit providing 4-in-1 hydraulic, air, dirt and magnetic separation, with 12" ANSI Flange connections, ASME Section VIII code stamped. It installs between the boiler circuit and the distribution circuits in hydronic heating and chilled water systems.
Best for installations where space or budget rules out separate air, dirt and magnetic devices, and where ferrous debris protection matters.
Specifications sourced from Caleffi NA technical literature, 2025 revisions.
Key Features
Four Functions in One Body
Combines hydraulic separation, air elimination, dirt separation and magnetic capture, replacing four discrete devices and their fittings.
Magnetic Ferrous Capture
A removable magnet assembly collects ferrous debris that non-magnetic separators pass through, protecting pumps and heat exchangers.
Low-Velocity Separation Chamber
An enlarged internal chamber drops fluid velocity so entrained air rises and heavier particulate settles, both continuously removed in service.
ASME Code Stamped
Fabricated and stamped to ASME Section VIII for 150 psi working pressure, registered with the National Board.
Blowdown Drain and Air Vent
An integral brass blowdown valve clears collected sediment and an automatic air vent discharges separated air without shutting the system down.
ANSI Flanged Connections
Flanged ports simplify installation and removal on large-diameter mains and support higher flow rates.
Technical Specifications
| Connection Size | 12" |
| Connection Type | ANSI Flange |
| Connection Style | ANSI Flange |
| Separation Functions | 4-in-1 hydraulic, air, dirt and magnetic separation |
| Maximum operating pressure | 150 psi |
| Medium temperature range | 32 - 270 deg F |
| Material | steel |
| Code Stamp | ASME Section VIII |
| Product Family | SEP4 |
Documentation
Design Resources
Related Products
- Caleffi 549510A : SEP4 4" ANSI Flange
- Caleffi 549552A : SEP4 2" ANSI Flange
- Caleffi 549562A : SEP4 2-1/2" ANSI Flange
- Caleffi 549582A : SEP4 3" ANSI Flange
Frequently Asked Questions
What does Caleffi NA549300AM do in a hydronic system?
Caleffi NA549300AM provides 4-in-1 hydraulic, air, dirt and magnetic separation. A hydraulic separator creates a low-velocity zone between the boiler circuit and the distribution circuits so each pump operates against its own loop only, removing flow interference without relying on closely spaced tees.
How is Caleffi NA549300AM different from a plain hydraulic separator?
It performs four jobs in one vessel: hydraulic separation, air elimination, dirt separation and magnetic capture of ferrous debris. A plain hydraulic separator performs only the first, so the other three functions would require separate devices.
What size connection does Caleffi NA549300AM have?
It is supplied with 12" ANSI Flange connections. Sizing should be based on system flow rate rather than pipe size alone; other sizes in the SEP4 family are listed under Related Products.
Is Caleffi NA549300AM ASME code stamped?
Yes. This model is fabricated and stamped to ASME Section VIII for 150 psi working pressure and is registered with the National Board.
What is the warranty on Caleffi NA549300AM?
Caleffi covers this product under its standard two-year limited warranty against defects in material and workmanship from the date of purchase. ZOT Supply is an authorized Caleffi distributor.
- Product Family:
- SEP4
- Separation Functions:
- 4-In-1 Hydraulic, Air, Dirt And Magnetic Separation
- Connection Style:
- ANSI Flange
- Connection Type:
- ANSI Flange
- Connection Size:
- 12 inch
- ASME Code Stamped:
- Yes
- Max Operating Pressure:
- 150 psi
- Medium Temperature Range:
- 32 - 270 deg F
- Body Material:
- steel