Watts HAV User Manual
For Residential, Commercial and Industrial Applications
Job Name Contractor
Job Location Approval
Engineer Contractor’s P.O. No.
Approval Representative
Series HAV
Air Vent
Automatic Vent for
Hot Water
ES-HAV
Sizes:1⁄8" and 1⁄4"
(3 and 8mm)
The HAV Hot Water Vent is designed for automatic or
manual air release on baseboards, convectors, radiators, and high points in piping systems.
The HAV valve utilizes moisture retaining discs within
the body which vary in volume when they change
from a wet to a dry condition. As the discs dry, they
allow air to escape from the system and when wet,
provide a positive shut-off.
FEATURES
• Attractive chromed brass body
• Durable "Stainless Steel" check valve
• Automatic or manual operation
• Quick venting design
• Positive shut-off ball check
• Heat resistant handwheel
• Suitable for use with hot water and low pressure
steam systems
• Easily maintained–replacement cartridge can be
installed without system shut down
• Simple two piece construction
Ordering Code
No. No. Description
590712
590713
590714 HAV-RC Replacement Cartridge
1
⁄8 HAV HAV Air Vent
1
⁄4 HAV HAV Air Vent
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.
USA: 815 Chestnut Street, North Andover, MA 01845-6098
Canada: 5435 North Service Road, Burlington, Ontario L7L 5H7
MATERIALS
The HAV Air Vent is manufactured in two parts (body
and disc cartridge).
• Chromed Brass - body
• Brass - disc bearing cover
• Stainless steel - check valve
• Copper - thermostat assembly
• Neoprene - O-ring
• Heat resistant ABS plastic material - handwheel
• Special cellulose fiber - disc
A periodic check of the condition of the discs will
establish the need for replacement. When the discs
are damaged, the valve can only operate manually;
to restore to automatic working, the cartridge must
be replaced.
To replace the cartridge, unscrew the handwheel,
clean the seat of the valve of any foreign matter and
then assemble a new disc cartridge. The body contains a check valve, preventing water leakage, therefore, this operation can be carried out without draining the water from the radiators.
PRESSURE-TEMPERATURE
Suitable for water only additives: Only inhibited glycol
based additives are permissible.
Maximum Working Pressure: 125 psi (8.6 bar)
Minimum Working Pressure: 1.45 psi (10 kPa)
Maximum Water Temperature: 240°F (116°C)
Minimum Water Temperature: 140°F (60°C)
Test Pressure: 130 psi (9 bar)
Maximum Steam Pressure: 10 psi (69 kPa)
CAPACITY
Diagram 1
Venting Capacity
2.12
1.77
1.41
1.06
SCFM
.71
.35
0
0 14.2 28.4 42.7 56.9 71.1 85.3 99.5 113.8 128 psi
0 .98 2.0 2.9 3.9 4.9 58.8 6.8 7.8 8.8 bars
Diagram 2
12
11
10
9
8
7
6
5
4
3
Drying Time in Hours
2
1
0
86 104 122 140 158 176 194 212 230 248 °F
30 40 50 60 70 80 90 100 110 120 °C
Water Temperature
BASIC CONSTRUCTION
15
1.14"
1.61"
.47"
1
⁄8" - 1⁄4"
.43"
Correct Installation/Maintenance
1
⁄8" - 1⁄4"
15
OK
Incorrect Installation/Maintenance
Min. 90"
ES-HAV 9844 © Watts Regulator Co., 1996 Printed in U.S.A.
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