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4194A, B, and C Series
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 (suffex letter
F), unscrew the nut holding the relief tubing assembly
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).
11. Position the gasket (key 5) on the rate/reset valve
assembly. Hold the gasket in place while installing the
rate tubing assembly (key 137) on the valve assembly
using the two machine screws (key 71).
12. Insert the reset tubing assembly (key 43) into the
rate/reset valve assembly and tighten the nut.
13. Insert the proportional tubing assembly (key 40)
into the rate/reset valve assembly and tighten the nut.
14. For controllers with anti-reset windup (suffix letter
F), insert the relief tubing assembly (key 44) into the
rate/reset valve assembly and tighten the nut.
15. Set the reset to 0.01 minutes per repeat and the
rate to OFF.
16. Apply the proper supply pressure to the controller,
cap the nozzle and check for leaks.
17. 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.
18. Perform the controller calibration procedures and,
if necessary, the remote set point calibration proce-
dure in section 4.
19. Mount the controller as described in the Installa-
tion section.
20. Connect external piping to the controller.
5–16
Replacing the Anti-Reset Windup (suffix
letter F) Differential Relief Valve
Refer to the 4194B or 4194C Series suffix letter F por-
tion of figure 5-21 for key number locations.
1. Loosen the two mounting screws in the differential
relief valve (key 55), and remove the relief valve.
2. Inspect the O-rings on the replacement relief valve.
Apply a suitable lubricant to the O-rings.
3. Install the replacement relief valve into the control-
ler frame, keeping in mind that:
When the arrow points up, the valve relieves with
decreasing output pressure.
When the arrow points down, the valve relieves
with increasing output pressure.
4. Tighten the two screws that hold the relief valve to
the frame.
5. The relief valve differential pressure is factory-set
at 5 psig (0.3 bar). Maximum differential pressure is 7
psig (0.5 bar); minimum differential pressure is 2 psig
(0.1 bar). If a different differential pressure setting is
desired, refer to the anti-reset windup valve calibration
procedure in section 4.
Replacing the Anti-Reset Windup (suffix
letter F) Relief Valve Tubing Assembly
Refer to the 4194B or 4194C Series suffix letter F por-
tion of figure 5-21 for key number locations.
1. Remove the controller assembly from the case by
performing steps 1 through 3 of the case and cover
replacement procedures.
2. Loosen the nuts at both ends of the relief valve tub-
ing (key 44), and remove the tubing.
3. Install the replacement relief valve tubing, and
tighten the tubing nuts at both ends.
4. Apply the proper supply pressure to the controller,
cap the nozzle and check for leaks. Remove the sup-
ply pressure.
5. 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.
6. Perform the controller calibration procedures and, if
necessary, the remote set point calibration procedure
in section 4.
7. Mount the controller as described in the Installation
section.
8. Connect external piping to the controller.
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