Watts AS-B User Manual
For Residential and Commercial Applications
ES-AS-B
Job Name
Job Location
Engineer
Approval
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Series AS-B
Bronze Air Separator
Size: 3⁄4” – 11⁄4” (20 – 32mm)
Series AS-B Bronze Air Separator is designed for efficient separation
of air from water in hydronic heating systems. Series AS-B has tappings for the installation of an expansion tank, air vent and for boiler
fill piping. Entrapped air in the hot water heating system piping is
dispersed by the internal agitator of the air separator as the water is
recirculated within the heating system piping and is removed by the
1
/2” air vent installed on the air separator. This provides quiet efficient
operation of the hot water heating system radiation.
Features
• Bronze construction
3
• Sizes
• Comes standard with tappings for boiler fill, expansion tank and
• Provides complete, continuous purging and venting of air in the
• Ideal for radiant heat systems
/4”, 1”, 11⁄4” (20, 25, 32mm) NPT sweat
1
/2” air vent
system when installed with the Watts Series FV4-M1 air vent
which is provided with the air separator
Contractor
Approval
Contractor’s P.O. No.
Representative
All AS-B Models come standard
with 1/2” FV4-M1 air vent as shown.
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AS-B-S (Sweat)
Specifications
An air separator shall be installed as indicated on the plans. Separator shall be of bronze construction with tappings for boiler fill, expansion tank and
(Sweat).
Watts product specifications in U.S. customary units and metric are approximate and are provided for reference only. For precise measurements,
please contact Watts Technical Service. Watts reserves the right to change or modify product design, construction, specifications, or materials without prior notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold.
1
/2” air vent. Separator shall be a Watts Series AS-B-S
Pressure — Temperature
Maximum Working Pressure: 125psi (862 kPa)
Maximum Operating Temperature: 275°F (135°C)
Typical Mounting
Watts
Model 1/2” FV-4M1
Laminar Flow
For most systems the AS-B will provide superior air separation with
minimal inlet/outlet piping length, optimum operation is achieved
with laminar flow, see Table 1 below.
Table 1
Pipe length to achieve laminar flow
Water feed piping from
Watts
Model SCV*
Watts
Model SCV*
Note: Supplied with Watts Model
Watts Model SB1156
or B911S
Watts
Model ET
Expansion Tank*
1
⁄2” (15mm) FV-4M1 and one 1⁄2”
(15mm) brass pipe plug.
*Model SCV service check valves and Watts Model ET expansion
tank are not supplied with the AS-B.
Dimensions - Weights
A
D**
SIZE (DN) INLET OUTLET
in mm in mm in mm
3/4” 20 131/2 343 41/2 114
1” 25 18 457 6 152
1
1
⁄4” 32 221/2 572 71/2 191
C
B
AS-B-S (Sweat)
MODEL SIZE (DN) DIMENSIONS WEIGHT
A B C D**
in. mm in. mm in. mm in. mm in. mm lbs. kgs.
*AS-B-S
*AS-B-S 1” 25 6
*AS-B-S 1
*Supplied with one
3
/4” 20 5 127 37/16 87 25/16 59 35/16 85 1.7 .77
1
⁄4” 32 61⁄2 165 45⁄16 110 3 76 35/16 85 3.4 1.6
1
⁄2” brass pipe plug and 1⁄2” FV4-M1 Float Vent.
1
⁄2 165 45⁄16 110 3 76 35/16 85 3.4 1.6
**Dimension for removal of air vent.
A Watt s Water Technolo gies Company
ES-AS-B 1044 © 2010 Watts
USA: No. Andover, MA • Tel. (978) 688-1811 • Fax: (978) 794-1848 • www.watts.com
Canada: Burlington, ONT. • Tel. (905) 332-4090 • Fax: (905) 332-7068 • www.wattscanada.ca
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