4195KA, KB, KC, and KS Controllers
Instruction Manual
Form 5207
April 2007
6-7
Replacing the Supply Gauge,
Proportional, Reset, Reset Valve, and
Positive Feedback Tubing Assemblies
WARNING
Refer to the Maintenance WARNING
on page 6-1.
1. Remove the controller assembly from the case
by performing steps 1 through 3 of the case and
cover replacement procedure.
2. Unscrew the nuts at each end of the tubing
assembly. Remove the tubing assembly.
3. Install the replacement tubing assembly.
4. Set the reset adjustment to 0.01 (4195KB and
KC Series) and set the rate adjustment to OFF
(4195KC Series).
5. Apply the correct supply pressure and check for
leaks with the nozzle capped for full output pressure.
Then, remove the supply pressure.
6. Position the controller assembly in the case and
start, but do not tighten the nine mounting screws.
Slide the controller assembly down to assure an
O-ring seal at the pressure connections along the
bottom of the case. Hold the controller assembly in
place while tightening the nine mounting screws.
7. Perform the controller calibration procedures and,
if necessary, the appropriate remote set point
calibration procedure in Section 3, 4, or 5.
8. Mount the controller as described in the
Installation section.
9. Connect the external piping to the controller.
Replacing the Proportional Band
Adjustment Knob, Nozzle Assembly, and
Set Point Beam Assembly
WARNING
Refer to the Maintenance WARNING
on page 6-1.
Figure 6-3 shows the parts locations for the
proportional band adjustment and set point beam.
Unless otherwise noted, refer to this figure while
performing the following procedures.
Disassembly
1. Remove the controller assembly from the case
by performing steps 1 through 3 of the case and
cover replacement procedure.
2. Remove the two machine screws (key 6) and lift
off the proportional band indicator cover (key 36).
See figure 7-1 for parts location.
3. Disconnect link 3 from the set point beam shoe,
part of the set point beam assembly (key 23).
4. Remove the set point beam bias spring (key 28).
5. Remove the screw and washer (keys 19 and 20)
that hold the adjustable set point pivot assembly
(key 17) to the frame and remove the pivot
assembly.
6. Unscrew the nut that secures the relay nozzle
tubing assembly (key 18) to the frame manifold
(key 135).
7. While holding the proportional band adjustment
knob, remove the screw and washer (keys 19
and 20) that hold the relay nozzle tubing assembly
(key 18) to the frame.
8. Remove the proportional band adjustment knob,
relay nozzle tubing assembly, and set point beam
assembly from the controller.
9. Remove the relay nozzle tubing assembly
(key 18) from the set point beam assembly (key 23).
10. Remove the E-ring (key 27) from the nozzle
assembly (key 21).
11. Remove the nozzle assembly (key 21) and
plastic washer (key 22) from the bottom of the set
point beam assembly (key 23).
12. Remove the retaining clip (key 26).
13. Remove the proportional band adjustment knob
(key 25) and plastic washer from the set point beam
assembly (key 23).
14. Inspect the nozzle assembly (key 21) and, if
necessary, replace it. Inspect the nozzle orifice and,
if necessary, clean it. Also, inspect the plastic
washers and, if necessary, replace them.
15. Inspect the nozzle assembly O-ring (key 24)
and, if necessary, replace it.
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