Replacing The Reset Restriction Valve (4195Kb Series); Replacing The Rate/Reset Valve Assembly (4195Kc Series) - Fisher 4195 KB Series Instruction Manual

29. If the reading recorded in step 26 is greater than
in step 25, adjust the reset gain screw (key 34) one-
half turn in (clockwise). If the reading recorded in step
26 is less than in step 25, adjust the gain screw (key
34) one-half turn out (counterclockwise).
30. Tighten the proportional bellows screw (key 35).
31. Repeat steps 25 through 30 until the difference is
less than 1 percent of the process scale span.
32. If 1 percent of process scale span cannot be
achieved by adjusting the gain screw (key 34), loosen
the machine screw (key 35) attaching the reset bel-
lows and slide it to the left if the reading in step 26 is
greater than in step 25, or to the right if the reading in
step 26 is less than in step 25. Tighten the screw and
repeat steps 25 through 31.
33. Remove the supply pressure, the output measure-
ment device, and the regulated process pressure
source.
34. 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.
35. Perform the controller calibration procedures and,
if necessary, the appropriate remote set point calibra-
tion procedure in section 3 or 4.
36. Mount the controller as described in the Installa-
tion section.
37. Connect the external piping to the controller.
Replacing the Reset Restriction Valve
(4195KB Series)
Refer to the 4195KB Series portion of figure 5–24 for
key number locations.
1. Remove the controller assembly from the case by
performing steps 1 through 3 of the case and cover
replacement procedure.
2. Remove the reset valve tubing assembly (key 42)
from the reset restriction valve (key 54).
3. Remove the reset tubing assembly (key 43) from
the reset restriction valve.
4. For controllers with anti-reset windup (suffix letter
F), remove the relief valve tubing assembly (key 44)
from the reset restriction valve.
5. Remove the screw (key 162) that fastens the reset
restriction valve to the frame.
6. Install the replacement reset restriction valve and
secure it with the screw removed in step 5.
7. Install the reset valve tubing assembly (key 42), the
reset tubing assembly (key 43), and for controllers
4195KA, KB, and KC Series
with anti-reset windup, the relief tubing assembly (key
44). Tighten all connections.
8. Set the reset adjustment to 0.01 minutes per re-
peat.
9. Apply the proper supply pressure to the controller,
cap the nozzle and check for leaks. Remove the sup-
ply pressure.
10. 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.
11. Perform the controller calibration procedures and,
if necessary, the appropriate remote set point calibra-
tion procedure in section 4.
12. Mount the controller as described in the Installa-
tion section.
13. Connect the external piping to the controller.
Replacing the Rate/Reset Valve Assembly
(4195KC Series)
Read this entire procedure before re-
moving any parts. Refer to the 4195KC
Series portion of figure 5–24 for key
number locations.
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 71) on the
side of the rate/reset valve assembly (key 262).
3. Gently pull the rate tubing assembly away from the
rate/reset assembly and, remove the gasket (key 5)
from the side of the rate/reset assembly.
4. Unscrew the nut holding the reset tubing assembly
(key 43) into the rate/reset valve assembly.
5. Unscrew the nut holding the proportional tubing
assembly (key 40) into the rate/reset assembly.
6. For controllers with anti-reset windup (suffix letter
F), unscrew the nut holding the relief tubing assembly
(key 44) into the rate/reset assembly.
7. While holding the rate/reset valve assembly, re-
move the machine screw (key 162) from the frame.
8. Remove the rate/reset valve assembly from the
frame.
9. Inspect and, if necessary, replace the gasket (key
5).
10. To install the replacement rate/reset valve assem-
bly, position the assembly on the frame (key 3) and
secure it with the mounting screw (key 162).
Note
5–15