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• Do not thread pipe too far. Valve distortion and/or mal-
function may result from excess pipe in the valve body.
• Apply counter pressure using a parallel jaw wrench only
to the flats on the flange when screwing the pipe into the
flanges.
• Do not overtighten the pipe. Follow the maximum torque
values listed below.
• After installation is complete, perform a leak test.
Recommended Torque for Piping
1/2"
3/4"
1"
375
560
750
Start-Up
• The inlet and outlet shut off valves should both be
closed.
• Slowly and carefully open the inlet shut off valve just
enough to allow inlet pressure to build up slowly in the
regulator until it is fully pressurized.
• Slowly open the outlet shut off valve(s) to allow a small
flow.
CAUTION: During start-up a pressure gauge must
be used on the regulator outlet pressure and care-
fully watched. While inlet pressure builds up, outlet
pressure must not exceed set point by more than 30%. If
outlet pressure exceeds set point by more than 30% close
the inlet shut off valve. The regulator is not closing prop-
erly. Check and make necessary corrections before
proceeding with start-up.
CAUTION: Make sure the flow of gas does not
create a hazard. With gas flowing, check for correct
inlet and outlet pressures. Complete start-up by making
sure that there are no leaks.
Set-Point Adjustment
• Remove the black protective cap.
• To increase the outlet pressure set point turn the adjust-
ment spindle clockwise with a screw driver.
• To decrease the outlet pressure set point turn the adjust-
ment spindle counterclockwise with a screw driver.
• Always use an accurate pressure gauge connected
downstream from the regulator to measure the actual
outlet pressure.
• Screw on protective cap.
• After adjusting the set point for normal operation check
to see that the gas pressure regulator operates as
intended.
Outlet Pressure Spring Replacement
• Remove the black protective cap.
• Release spring by turning the adjustment spindle
counterclockwise with a screw driver. Turn the spindle to
the stop.
• Remove the aluminum cap.
• Remove spring.
4
1-1/4" 1-1/2" 2"
NPT pipe
875
940
1190
[Ib-in]
Vent Line
• On indoor installations requiring venting outdoors, run
the piping as short and as direct as possible.
• With natural gas or other hazardous gases, vent to an
approved location.
• Screen and protect the opening outdoors to guard
against any blocking of the vent line.
CAUTION: When venting is required, each regulator
must be individually vented.
OPERATION
• Insert new spring.
• Assemble complete adjustment device and adjust
desired outlet pressure. Follow the set point adjustment
instructions.
• Screw on the black protective cap.1
• Apply new label provided with new outlet pressure range
onto the name plate.
Filter
• Inspect the filter at least once a year.
• Replace the filter if the pressure drop across the filter is
more than 4" W.C.
• Replace the filter if the pressure drop across the filter is
more that twice as high as the first installation inspec-
tion.
Replacable Filter
Filter Change
• Remove the FRI/6 by following the mounting instructions
in reverse order.
• Remove the support ring.
• Remove the filter insert.
• Insert a new filter insert.
• Press in the support ring.
• Re-install the FRI/6 following the mounting instructions.
• Perform a function and leak test.
Adjustment Cover
Outlet Pressure
Spring Adjustment
Spring Replacement
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