Vent - Emerson Fisher KC Series Instruction Manual

Instruction Manual
Form 5207
April 2007

Vent

WARNING
Personal injury or property damage
could result from fire or explosion of
accumulated gas, or from contact with
hazardous gas, if a flammable or
hazardous gas is used as the supply
pressure medium. Because the
controller case and cover assembly do
not form a gas-tight seal when the
assembly is enclosed, a remote vent
line, adequate ventilation, and
necessary safety measures should be
used to prevent the accumulation of
flammable or hazardous gas.
However, a remote vent pipe alone
cannot be relied upon to remove all
flammable or hazardous gas. Vent line
piping should comply with local and
regional codes and should be as short
as possible with adequate inside
diameter and few bends to reduce
case pressure buildup.
4195KA, KB, KC, and KS Controllers
When installing a remote vent pipe,
take care not to over-tighten the pipe
in the vent connection. Excessive
torque will damage the threads in the
connection.
If a remote vent is required, the vent line must be as
short as possible with a minimum number of bends
and elbows. Vent line piping should have a minimum
inside diameter of 19 mm (3/4 inches) for runs up to
6.1 meters (20 feet) and a minimum inside diameter
of 25 mm (1 inch) for runs from 6.1 to 30.5 meters
(20 to 100 feet).
The vent must be protected against the entrance of
any foreign material that could plug it; or if a remote
vent is not required, the vent opening in the case
must be protected against the entrance of any
foreign material that could plug it. Check the vent
periodically to be certain it is not plugged.
CAUTION
2-5