C-5230 Pneumatic Signal Limiter Reference Bulletin

Текст документа

Pneumatic Control Manual 717.1
                                                              Comparators, Cumulators, and Relays Section
                                                                                        Reference Bulletin #1
                                                                                              Issue Date 1080

                                            C-5230
                                     Pneumatic Signal Limiter

There are basically two                 Never install C-5230 in Input 2          High and low limit adjustments
applications for the C-5230, first      connection of T-9000 controllers.        will shift with variations in supply
as a high and low signal limit          Loss of control will occur when          air pressure. Adjustments
adjustment used to prevent              limit is reached.                        should be made with the C-5230
further readjustment of the                                                      piped on the job, as lengths of
temperature on a two element            If remote set point is furnished,        lines and variations in air flow
(Master--Submaster) controller          limits may also be required,             will change settings.
and second, as a minimum                which can be accomplished on
position adjustment for N.C.            the R-4000 dial or by installing
outdoor air dampers.                    another C-5230 in the remote
                                        set point line.

Note:     The C-5230 is a non-relay
          instrument, without
          feedback, and its settings
          will vary 1:1 as the supply
          air varies 1:1.

© 1980 Johnson Controls, Inc.                                                                                       1
  Code No. LIT-7171436
                                   O.A. Minimum Position Adjustment
Adjusting screw “L” is used to
provide the minimum output
pressure for N.C. dampers.
Input 2 must have a pressure
lower than the desired minimum
value when adjustment is made.
Since screw “L” drastically
reduces the exhaust air to
atmosphere, the output line
must be connected only to a
small capacity (volume)
chamber; such as, the pilot
connection of a positioner.
5/32 in. O.D. tubing should also
be used to keep capacity down
to a minimum when running
output line from panel to
positioner.

Controls Group
507 E. Michigan Street
P.O. Box 423                                                          Printed in U.S.A.
Milwaukee, WI 53202

2 C-5230 Reference Bulletin

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