Replacing The Gauges; Replacing The Supply Gauge, Proportional, Reset, And Reset Valve Tubing Assemblies; Replacing The Proportional Band Adjustment Knob, Nozzle Assembly, And Set Point Beam Assembly - Fisher 4195 KB Series Instruction Manual

4195KA, KB, and KC Series
7. Remove the blow-out plug (key 72) from the origi-
nal case, and install it in the replacement case.
8. Perform the controller calibration procedures and, if
necessary, the appropriate remote set point calibration
procedure in section 3 or 4.
9. Mount the controller as described in the Installation
section.
10. Connect the external piping to the controller.

Replacing the Gauges

CAUTION
Before performing this procedure, be
sure the replacement gauges are the
correct range so that they are not dam-
aged by overpressure.
1. Unscrew the output pressure gauge or the supply
pressure gauge (key 46) from the frame (key 3).
2. Before installing the replacement gauge, coat the
threads on the gauge with a sealant such as key 311
or equivalent.
3. Screw the replacement gauge into the frame.
4. Apply the correct supply pressure and check for
leaks with the nozzle capped for full output pressure.
Replacing the Supply Gauge,
Proportional, Reset, and Reset Valve
Tubing Assemblies
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 assem-
bly. 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.
5–6
7. Perform the controller calibration procedures and, if
necessary, the appropriate remote set point calibration
procedure in section 3 or 4.
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
Figure 5–3 shows the parts locations for the propor-
tional 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 5–24 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 tub-
ing 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 as-
sembly 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 as-
sembly (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 nec-
essary, replace it. Inspect the nozzle orifice and, if