THE GAS INDUSTR
Y
RM-1301 R1
Installation and
Maintenance
Instructions
Installation and Start-Up
1.
Remove the shipping plugs from both the regulator inlet and
outlet connections.
2.
Make certain that the inside of the piping and the regulator
inlet and outlet connections are clean. The connections must
be free of dirt, dope and other debris.
3.
Use pipe joint material only on the male threads of the pipe
being connected to the regulator. Do not use pipe joint
material on the female threads of the regulator.
4.
Install the regulator in the piping. Make certain that the gas
flow through the regulator is in the direction as indicated by
the arrow on the regulator body.
The regulators may be installed in any position: right side up,
upside down, vertical piping, diagonal piping, etc., If required,
the diaphragm case may be rotated 360° in any angle
increment. To rotate the 143-80 diaphragm case, loosen the
coupling nut
12
and reposition the diaphragm case to
the desired position. Retighten the coupling nut
12
to
reseal the regulator.
The diaphragm case vent
11
should be positioned to
minimize the chances of moisture collecting on the vent side
of the diaphragm.
The diaphragm case vent must be positioned to protect
against flooding, rain, ice formation, traffic, tampering, etc.
The vent must be protected against nest building animals,
bees, insects, etc. to prevent vent blockage and minimize the
chances for foreign material from collecting in the vent side of
the regulator diaphragm. If required, the upper diaphragm
case
4
may be rotated by removing the upper-to-lower case
flange screws
10
and rotating the upper diaphragm case to
the desired position. Reinstall the diaphragm flange screws
and tighten to hold the diaphragm case in position and reseal.
CAUTION:
Turn the gas on very slowly. If an outlet stop is used, it should be
opened first. Do not overload the diaphragm with a sudden surge
of inlet pressure. Monitor the outlet pressure during start-up to
prevent an outlet pressure overload.
5.
Turn the gas on very slowly.
6.
If installing model 143-80-6 Low Pressure Cutoff (LPCO),
remove cap
1
and pull up pin located inside spring housing
to deactivate LPCO device and intitiate flow through the
regulator.
7.
Make certain that there are no leaks and that all connections
are tight.
8.
Adjust outlet pressure (set point) by removing cap
1
and
turning adjustment spring button
2
. Turn clockwise to
increase and counter-clockwise to decrease outlet pressure.
Only adjust when gas is flowing through regulator. Be sure to
reinstall cap.
CAUTION:
It is the user's responsibility to assure that all regulator vents
and/or vent lines exhaust to a non-hazardous location away from
ANY POTENTIAL sources of ignition. Where vent lines are used,
it is the user's responsibility to assure that each regulator is
individually vented and that common vent lines ARE NOT used.
9.
The vent connection is an escape path for the regulated gas.
Depending upon the type of gas, it could be flammable as with
natural gas and propane. Therefore, the vent connection needs
to be located and/or piped so that potential discharge occurs
in a safe area away from buildings, open flames, collection
areas, arcing devices, etc.
Regulators that are installed indoors or in a non-vented area
must be vented to the outside. Run vent piping from the
regulator vent connection to a non-hazardous location on the
outside away from any potential sources of ignition.
For regulators equipped with internal relief valves (IRV),
Models 143-80-2, 143-80-2HP and 143-80-6, the vent piping
must be vent connection size or larger and its length be as
short and direct as possible to a safe area. This is to assure
the venting of the internal relief valve discharge to the
atmosphere without excessive pressure increase in the
regulator and downstream piping.
Continued on back.
Sensus Metering Systems
T
he Model 143-80 is an excellent general purpose gas
pressure regulator. It can be used for natural gas, air, CO
2
, propane, butane, nitrogen, and other gases. It can be
used for gas services to homes, commercial establishments and small industries, for burners, unit heaters,
boilers, and other equipment. Model 143-80-1 is a standard regulator. The Model 143-80-2 includes an internal
relief valve. The 143-80-2 is also available with a low pressure cut-off, designated as the model 143-80-6.
Model 143-80 Service Regulator
