4195KA, KB, KC, and KS Controllers
Instruction Manual
Form 5207
April 2007
6-16
RESET
BELLOWS
WASHER
(KEY 362)
TWO SCREWS
(KEY 35)
RESET
GAIN
BELLOWS
BRACKET
(KEY 31)
FOUR SCREWS (KEY 6)
PROPORTIONAL
BELLOWS
LINK 4
(KEY 65)
W4199 / IL
Figure 6-12. Bellows Assembly, Bellows Bracket,
and Bellows Beam Location
5. Remove the four machine screws (key 6) from
the bellows beam (key 49) and remove the bellows
bracket (key 31).
6. Remove the proportional tubing assembly (key
40) from the proportional bellows, the reset tubing
assembly (key 43) from the reset bellows or the
positive feedback tubing assembly (key 45) from the
positive feedback bellows, depending on which
bellows is to be replaced.
7. Remove the four machine screws (key 71) from
the bellows beam and remove the bellows beam
from the frame.
CAUTION
When removing and replacing the
proportional, reset, or positive
feedback bellows, keep in mind that
the bellows has left-hand threads.
Overtightening could damage the
threads.
Note
Both bellows need not be removed if
only one requires replacement.
8. Unscrew the bellows assembly (key 48). If the
bellows assembly cannot be removed by hand,
thread a machine screw (key 35) into the bellows
until tight; then loosen the bellows assembly by
applying clockwise torque to the machine screw.
9. Before installing the replacement bellows, coat
the threads with a suitable lubricant, such as key
310. Screw in the replacement bellows until it is
finger tight against the frame (key 3).
10. Reinstall the bellows beam (key 49) and tighten
the machine screws (key 71).
11. Position the bellows bracket (key 31) over the
bellows. Insert a machine screw (key 35) through
the bellows bracket (key 31) and into the
proportional bellows. Do not tighten.
12. Place the washer (key 362) on the second
machine screw (key 35) and start the screw through
the bellows bracket (key 31) into the reset bellows.
Do not tighten.
13. Compress the bellows and start the four
machine screws (key 6) through the bellows bracket
(key 31) into the bellows beam (key 49), but do not
tighten.
14. Be sure that the bellows bracket is aligned such
that it does not rub on the frame at any point and
tighten the screws (keys 6 and 35).
15. Install the proportional, reset, or positive
feedback tubing assembly on the bellows base.
16. For a 4195KB or KC Series controller, set the
reset adjustment for 0.01 minutes per repeat. For a
4195KC Series controller, set the rate adjustment to
OFF.
17. Apply the correct supply pressure with the
nozzle capped and check for leaks. Remove the
supply pressure.
18. Reconnect link 4 (key 65) to the bellows
bracket. Be sure that the link does not contact the
frame. If it does, loosen the four screws (key 6) that
attach the bellows bracket to the bellows beam and
reposition the bellows bracket to provide clearance.
Be sure the bellows bracket does not rub on the
frame; then, tighten the screws.
19. Lift link 4 out of the hole in the bellows bracket
(key 31) and ensure it drops back into the hole
under its own weight. If not, perform steps 35
through 41 of the flapper assembly and flapper
flexure pivot assembly replacement procedures.
20. If the controller is a proportional-only (4195KA
or KS Series), go to step 33. If the controller has
reset (4195KB or KC Series), continue with step 21.
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