Startup And Shutdown; Commissioning; Controller Spring Adjustment - Fisher EMERSON VSX4 Series Instruction Manual

VSX4 and VSX8 Series
• When assembling piping and flanges, do not apply
excessive force to the body, bolts, O-rings, flanges
or fittings. All connections should be compatible
with the geometry and working conditions of
the pipeline.
• If needed, a support may be used under the piping
and regulator/controller body to avoid excessive
pressure force on the regulator/controller.
• Connect downstream control line tubing to the
1/4 NPT connection in the lower casing and to the
downstream pipe respecting a minimum distance of
four times its diameter (see Figure 5).
• Periodically check all vent openings to be sure that
they are not plugged.

Startup and Shutdown

This Instruction Manual should be used
in conjunction with the instruction
manual of the associated equipment.

Commissioning

!
all interventions on the equipment
should only be performed by competent
and trained personnel.

Controller Spring Adjustment

!
Before proceeding with the adjustment of
the controller springs, the operator must
ensure upstream and downstream valves
are closed and adjusting screws (keys 43
and 40, Figure 13) are unscrewed (refer to
Table 6).
Overpressure and Underpressure
Shutoff (OPSO / UPSO) Setpoint
Adjustment (Figure 3)
• Using a flathead screwdriver, turn the OPSO adjusting
screw (key 43) clockwise until it stops turning.
• Apply nominal outlet pressure of the associated
regulator to the downstream system. Refer to
Figure 5.
8
CAUTION
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• Reset the controller per the resetting procedure
(refer to the Resetting Procedure section for detailed
resetting instructions).
• Slowly decrease the downstream pressure to the
desired UPSO value (P
• With a screwdriver, turn the UPSO adjusting screw
clockwise (key 40) until the controller trips.
• Apply nominal outlet pressure of the associated
regulator to the downstream system.
• Reset the controller by pulling the reset button
(key 30) until the mechanism is latched.
• Slowly increase the downstream pressure to the
desired OPSO shutoff value (P
• With a screwdriver, turn the OPSO adjusting screw
counterclockwise (key 43) until the controller trips.
Overpressure Shutoff (OPSO) Setpoint
Adjustment Only (Figure 3)
• Using a flathead screwdriver, completely remove
and discard the UPSO adjusting screw (key 40) by
turning it counterclockwise.
• Remove and discard the UPSO spring (key 38)
and the mini washer (key 103).
• Using a flathead screwdriver, turn the OPSO
adjusting screw (key 43) clockwise until it
stops turning.
• Apply nominal outlet pressure of the associated
regulator to the downstream system.
• Reset the controller per the resetting procedure,
(Refer to the Resetting Procedure section for
detailed resetting instructions).
• Slowly increase the downstream pressure to the
desired OPSO value (P
• Using a flathead screwdriver, turn the OPSO
adjusting screw counterclockwise (key 43) until the
controller trips.
Underpressure Shutoff (UPSO) Setpoint
Adjustment Only (Figure 3)
• Using a flathead screwdriver, turn the OPSO
adjusting screw (key 43) clockwise until it
stops turning.
• Apply nominal outlet pressure of the associated
regulator to the downstream system, then reset
the controller per the resetting procedure (refer
to the Resetting Procedure section for detailed
resetting instructions).
• Slowly decrease the downstream pressure to the
desired UPSO value (P
• With a screwdriver, turn the UPSO adjusting screw
clockwise (key 40) until the controller trips.
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