172-65528A-01 (VS3-E/VS3-P/VS3-EP) 8 Jul 2015
10
Troubleshooting
When disassembling or removing the product, wait until the internal
pressure equals atmospheric pressure and the surface of the product
has cooled to room temperature. Disassembling or removing the
product when it is hot or under pressure may lead to discharge of fluids,
causing burns, other injuries or damage.
CAUTION
When the product fails to operate properly, use the following table to locate the
cause and remedy.
Problem
Cause
Remedy
No air is
discharged or
discharge is
poor
The trapped air cannot displace the
water in the piping
Correct the inlet piping
(Inner diameter should be at least
16mm (
5
/
8
in))
The valve seat is clogged with dirt or
foreign matter
Clean the valve seat
The inlet or outlet piping is clogged
Clean the piping
The operating pressure exceeds the
maximum specified pressure for this
product
Replace the air vent with a model
that has a suitable operating
pressure rating
Water leaks
when the vent
is closed
There is a build-up of rust or scale on
the valve seat or the valve seat is
damaged
Clean the valve seat or replace with
a new valve seat
The float is misshapen, dirty or has a
film build-up
Clean the float or replace with a
new float
The installation angle of inclination is
incorrect
Correct the installation
The vent does
not close and
water is blowing
The float is damaged or filled with water Replace with a new float
The specific gravity of the liquid is outside
the specifications for this product
(this product is for water systems)
Select a product with suitable
specifications for the operating
conditions
