Fisher 4195 KB Series Instruction Manual page 41

4195KA, KB, and KC Series
TAB
HOLE
W3761 / IL
Figure 5–4. Proportional Band Adjustment Knob Setting
19. Insert the nozzle assembly (key 21) through the
set point beam assembly (key 23), the plastic washer
(key 22), the proportional band adjustment knob (key
25), and the retaining clip (key 26) into the cap. Align
the nozzle with the tab on the proportional band ad-
justment knob shown in figure 5–4; make sure the pro-
portional band adjustment knob engages the flats on
the nozzle assembly.
20. While holding the nozzle assembly (key 21)
against the set point beam assembly (key 23), de-
press the retaining clip (key 26), and install the E-ring
(key 27) into the E-ring groove on the nozzle assembly
(key 21). Ensure that all three tabs of the E-ring are
engaged.
21. Inspect the O-ring on the relay nozzle tubing as-
sembly (key 18) and, if necessary, replace it. Apply a
suitable lubricant to the O-ring.
22. Install the relay nozzle tubing assembly (key 18)
into the set point beam assembly.
23. Set the proportional band adjustment between
DIRECT and REVERSE. Do this by aligning the tab on
the proportional band adjustment knob with the hole in
the set point beam assembly as shown in figure 5–4.
24. Position the proportional band adjustment knob,
relay nozzle tubing assembly, and the set point beam
assembly on the frame. Screw the relay nozzle tubing
nut loosely into the frame manifold.
5–8
FLAPPER
W3449 / IL
Figure 5–5. Nozzle-Flapper Positioning
25. Insert the machine screw, with plain washer (keys
19 and 20), through the frame and start it into the relay
nozzle tubing assembly (key 18), but do not tighten.
26. Center the nozzle on the flapper as shown in fig-
ure 5–5 while squeezing the set point beam assembly
firmly against the relay nozzle tubing assembly. With
the nozzle centered on the flapper, tighten the ma-
chine screw (key 19). Ensure that the nozzle is still
centered on the flapper.
27. Insert the pivot of the adjustable set point pivot
assembly (key 17) into the hole in the set point beam
assembly (key 23).
28. Insert the screw, with washer (keys 19 and 20),
through the frame (key 3) and start it into the adjust-
able set point pivot assembly (key 17), but do not
tighten.
29. Squeeze the adjustable set point pivot assembly
against the set point beam assembly. Check to be
sure the nozzle is still centered on the flapper and
tighten the machine screw (key 19). If necessary, loos-
en both machine screws (key 19) to allow slightly mov-
ing the adjustable set point pivot assembly, set point
beam assembly and the relay nozzle tubing assembly
as a unit to center the nozzle on the flapper. After cen-
tering the nozzle, tighten the two machine screws.
30. Turn the proportional band adjustment knob to 5
percent DIRECT. Refer to figure 5–6 to locate the
locking nut on the adjustable set point pivot assembly.
Loosen the locking nut and back out the set screw
slightly so that the set point beam assembly falls un-
NOZZLE