Watts DuoVent User Manual
Page 2
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Installation – DuoVent
ES-DuoVent 0314
© Watts Regulator Company, 2003
Printed in U.S.A.
USA: 815 Chestnut St., No. Andover, MA 01845-6098; www.wattsreg.com
Canada: 5435 North Service Rd., Burlington, ONT. L7L 5H7; www.wattscda.com
Fig. 1
*2.5 times pipe ID
ID = Inside Dimensions
*
*
Pipe
ID
Pipe
ID
Figure 1 shows the installation of the DuoVent for the venting of
air while the fluid is circulating in the system. The figure shows
the required increase in pipe size in order to obtain proper sepa-
ration of air from water. Watts Series AS Air Scoop which is
designed for efficient separation of air from water in hydronic
heating systems can also be installed.
Figure 2 – When the DuoVent is installed as shown, the air will
not be vented while the fluid is circulating in the system, but it
can vent when the system is shut off.
The DuoVent should be mounted only in a vertical position as its
operation is based on the vertical movement of the float (see Fig. 3).
Fig. 3
Fig. 4
Loosen 2 turns
for proper
venting
SIZE (DN)
DIMENSIONS
WEIGHT
A
B
C
D
D
1
in.
mm
in.
mm
in.
mm
in.
mm
in.
mm
in.
mm
oz.
gm.
1
⁄
8
3
1
5
⁄
16
33
3
76
2
11
⁄
16
68
5
⁄
16
8
5
⁄
16
8
4.2 119
1
⁄
4
8
1
5
⁄
16
33
3
1
⁄
8
79
2
11
⁄
16
68
7
⁄
16
11
5
⁄
16
8
4.2 119
*
Note: In order to get the best results in venting air from risers,
use connecting pipes of at least
1
⁄
2
" diameter between the “Float Vent” valves and the installation.
Operation: IMPORTANT!
After installing the DuoVent, back off the black vent cap two turns (see Fig. 4). This is the
proper operating setting which will allow air to be vented from the system. It is advisable
to leave the cap on to prevent impurities from entering the valve.
Warning! system fluid may be hot. Use Caution when manual venting hot water systems.
Dimensions – Weights
D
D
1
C
A
B
Fig. 2