LP-Gas Serviceman’s Manual

LP-Gas Regulators
Indoor Installation of Regulators
Regulators installed inside a building must have the bonnet vent
piped away. To maintain the large vent capacity relief feature of
the regulator, the vent piping should be at least as large as the vent
opening on the regulator bonnet.
To pipe away the LV4403B or LV5503B regulators, for example,
remove the vent screen from the bonnet vent and install 3/4” pipe
into the bonnet vent threads and pipe to the outside of building.
Install vent protection on the outlet of the pipe away vent line.
To utilize the vent screen and retainer supplied with the regulator,
use a 3/4” NPT 90º elbow. Insert screen into 3/4” F.NPT outlet of
elbow. Thread retainer into outlet at least 1 turn. Install the elbow
with vent screen pointing down. The vent line must be installed in
a manner to prevent the entry of water, insects, or foreign material
that could cause blockage. The discharge opening must be at least
3 feet from any opening below it.
NOTE: Do not use regulators with over 5 PSIG inlet pressure
indoors. Follow all local codes and standards as well as NFPA 54
and 58.
3/4” Elbow
3/4” Elbow
Vent Screen
with supressor
3/4” Pipe
From 1 st stage
regulator
To appliances
3/4” Elbow
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