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Breather Plug
• All FRS's have a breather plug that threads into the regula-
tors's vent connection.
Do not removed plastic breather plug unless venting
outdoors is required.
This plug is not the vent limiter, and it prevents debris from
entering the upper chamber of the regulator. Debris in the
upper chamber of the regulator will adversly affect regulator
performance.
• The FRS regulator must also be able to exchange air through
the breather hole in order to properly regulate. Do not plug
the breather hole, and clean it out if necessary.
Vent Limiting Device & Vent Line Connection
Vent Limiting Device
The FRI/6 series regulator contains an internal, factory in-
stalled vent limiting device, which limits the escape of gas to
less than 0.5 CFH @ 5PSI in case atmospheric diaphragm
ruptures. Venting required unless accepted by the authority
having jurisdiction.
Vent Line Requirements
• Follow the local code for vent sizing and termination re-
quirements. In the absence of local codes, follow National
Fuel Gas Code NFPA 54, the International Fuel Gas Code
or the CSA B149.1 installation code for venting require-
ments.
• Terminate the vent to an approved location.
• At the point of termination, the vent line must be protected
from insects and water intrusion. It is highly recommend
to install an insect screen and terminate the pipe with the
exit facing downwards to prevent rain water from entering.
Installation Procedure
• If venting is required, the vent line is to be connected to the
upper dome of the FRS regulator as illustrated.
• Remove the beather plug.
• On indoor installations requiring venting outdoors, run the
piping as short and as direct as possible.
• The vent connection is G 1/4. G 1/4 to 1/4"NPT adapter is
available: (P/N 231-944) with replacable gasket(P/N 171-260).
In the absence of venting codes and where vent-
ing is required, each regulator must be vented
separately from all other vents.
Breather plug
Breather hole
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