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Before
installing
loose dirt.
threads only.
introducing
4.
DO NOT use a pipe strainer in the line leading to the vent.
5.
For
occasional
suitable
only small additional amounts of air need to be vented, so
there is no difficulty in getting air to enter the vent
countercurrent
6 .
For
continuous
necessary.
very
fast
provided, as shown in Fig. 3.
7 .
Be certain the vent is installed properly, with the CAP AT
THE TOP for air and gas relief service.
8.
Install the air vent at the high points of the system.
the
accompanying
Air vents should be installed so that they can be checked
9.
periodically.
drain,
maintenance
The pipe plug in the cap of the air vent can be replaced
10.
with a test cock or test valve for vent testing or even
manual venting.
the vent is not air bound due to the orifice being clogged.
In
addition, the manual test cock will enable the operator
to vent the unit manually should the automatic vent fail.
11.
If the vent is installed in an inaccessible location, a l/4"
copper tube drain line to a slop sink, floor drain, or other
visible
location
1.
No discharge from the vent is normal on hydronic
but is not proof that the vent functions properly.
the air vent, crack the test cock.
correctly, a little air should escape, followed by water.
2.
Vent Does Not Open.
If a lot of air escapes out of the test cock before water
begins
to
full of air and that the float did not sink to open the
valve, or that the valve was plugged.
closing
the
a .
Remove the vent cover and inspect the mechanism. If
the mechanism cannot be made to operate freely after
cleaning
b.
Check the orifice for dirt.
orifice
c .
On
the orifice is too large for the operating pressure.
Replace the mechanism with one sized for
pressure.
ARMSTRONG 21AR AND 21-312AR AIR VENTS
the
Use pipe dope or teflon sparingly and on male
Leave the end thread exposed to avoid
sealant
into
venting, a single pipe 3/4" or larger is a
connection.
to
the
operation, an equalizing line is usually
Where
gas
venting
is
diagrams
A drain line should be piped to a floor
slop sink, or
personnel
can
A test cock makes it possible to check that
makes
discharge, it is a sign that the vent body was
gate
valve
and
inspection,
cannot
be
new
installations, an air vent may fail to open if
vent, flush out the line to remove
the
system.
Once the system is filled with water,
water
displaced.
enters
the
system
required, an equalizing line should be
for
typical
other
visible
regularly
check
periodic
inspection
before
opening
order
a
Clean
cleared,
order
2
continuously
installations.
location
for
leakage.
practicable.
If the vent is working
Isolate the vent by
for
inspection.
new
assembly.
the
orifice.
a
new
mechanism.
your
or
when
See
where
systems,
To
check
If the
operating