Instruction manual

VSX4 and VSX8 Series Controller
!
WARNING
Failure to follow these instructions or
to properly install and maintain this
equipment could result in an explosion

personal injury or death.
Fisher
®
controller must be installed,
operated and maintained in accordance
with federal, state and local codes, rules
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


or service the VSX4 and VSX8 Series
controller. If a leak develops or if the

to the unit may be required. Failure
to correct trouble could result in a
hazardous condition.
Installation, operation and maintenance

personnel may result in improper
adjustment and unsafe operations which

personal injury.
Figure 1. VSX4 and VSX8 Series Controller
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
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Introduction
Scope of the Manual
This Instruction Manual provides installation,
adjustment, maintenance and parts ordering
information for the VSX4 and VSX8 Series controller.
Instructions for other equipment used with the
controller, such as pressure regulators, can be found
in separate instruction manuals.
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

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Principle of Operation . . . . . . . . . . . . . . . . . . . . . . . . .5
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Startup and Shutdown . . . . . . . . . . . . . . . . . . . . . . . . .8
Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Controller Spring Adjustment . . . . . . . . . . . . . . . . . . . .8
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Parts Ordering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
VSX4 and VSX8 Series
Instruction Manual
Form 5867
January 2015
D103127X012
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