WARNING
Personal injury or system damage may result if
this controller is installed, without appropriate
overpressure protection, where service
conditions could exceed the limits given by the
nameplates of either the regulator or controller
or exceed the limits indicated in the regulator
or controller instruction manuals.
All vents should be kept open to permit
free ow of gas to the atmosphere. Protect
openings against entrance of rain, snow,
insects or any other foreign material that may
plug the vent or vent line. When installing
outdoors, point the spring case vent of the
regulator and of the controller downward to
allow condensate to drain. This minimizes the
possibility of freezing and accumulation of
water or other foreign materials entering the
vent and interfering with proper operation.
Controller installations should be adequately
protected from physical damage.
The equipment should not receive any type
of shock causing damage to the casing and
therefore causing leaks.
No modication should be made to the
structure of the equipment (drilling, grinding
and soldering).
Under enclosed conditions or indoors,
escaping gas may accumulate and be an
explosion hazard. In these cases, the vent(s)
should be piped away from the regulator/
controller to the outdoors.
Failure to install a downstream control line
could result in a hazardous condition. Install
downstream control line(s) to the controller
when construction uses external pressure
registration. The regulator and controller
will not control pressure or shut off if a
downstream control line is not installed on
those constructions where external pressure
sensing line is required.
If the controller is exposed to an overpressure
condition, it should be inspected for any
damage that may have occurred. Controller
operation within ratings does not preclude the
possibility of damage from external sources or
from debris in the pipeline.
General Installation Instructions
Note
The VSX4 and VSX8 Series can be rotated
360° for easy installation and maintenance.
Install, use and maintain in accordance to all applicable
codes and standards.
Before proceeding to installation:
• Ensure that the controller is compatible with the gas
being regulated.
• Check for damage that might have occurred
during shipment.
• Check for and remove any dirt or foreign material that
may have accumulated in the regulator or controller body.
• Ensure that the external or internal sense port is clean.
• When applying pipe sealing compound to piping and
ttings, always apply to external threads.
• Verify that:
- Equipment limits of utilization (PS, TS)
correspond to the desired operating conditions.
- The inlet is protected by an appropriate device(s) to
avoid exceeding the allowable limits (PS, TS).
- The controller and its springs correspond to the desired
operating conditions of associated regulator.
• 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 6).
• Periodically check all vent openings to be sure that they
are not plugged.
REGULATOR SETPOINT,
mbar / psig
CONTROLLER STANDARD SETTINGS
UPSO / Minimum OPSO(1)(2) / Maximum OPSO(3) / Maximum
Pd< 35 / 0.51 Pdx 0.5 Pdx 2.0 Pdx 2.0 + 10 mbar / 0.145 psig
35 / 0.51 < = Pd< 60 / 0.87 Pdx 0.5 Pdx 1.7 Pdx 1.7 + 10 mbar / 0.145 psig
60 / 0.87 < = Pd< 160 / 2.32 Pdx 0.6 Pdx 1.5 Pdx 1.5 + 10 mbar / 0.145 psig
160 / 2.32 < = Pd< 180 / 2.61 Pdx 0.7 Pdx 1.4 Pdx 1.4 + 10 mbar / 0.145 psig
180 / 2.61 < = Pd< 300 / 4.35 Pdx 0.7 Pdx 1.4 - - - -
300 / 4.35 < = PdPdx 0.7 Pdx 1.3
The VSX4 Series assembly part number (without valve plug and controller springs): LP: GE35589X012, HP: GE35590X012
The VSX8 Series assembly part number (without valve plug and controller springs): LP: ERCA02667A0, HP: ERCA02668A0
1. Regulator without relief valve (or with relief valve set above controller setting).
2. When selecting OPSO set points, the outlet pressure rating of the regulator should be considered.
3. Regulator with relief valve (set below controller setting).
Table 5. Controller Standard Factory Settings
