172-65170MA-06 (VAS) 9 Jul 2015
10
Troubleshooting
NEVER apply direct heat to the float. The float may explode due to
increased internal pressure, causing accidents leading to serious injury
or damage to property and equipment.
WARNING
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 and
remedy the cause.
Problem
Cause
Remedy
No initial air is
discharged
(blocked)* or
discharge is
poor
The trapped air cannot displace the
water in the piping
Correct the inlet piping
The valve seat is clogged with dirt or
foreign matter
Clean the valve seat
The inlet or outlet piping is clogged
Clean the piping
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 system)
Select a product with suitable
specifications for the operating
conditions
* NOTE: Once the air vent closes, it will remain closed until internal pressure drops to near or
below atmospheric pressure. This condition may be confused with a malfunction
(blocked). If air is expected to accumulate in the piping during operation, use
together with an automatic air vent.
