Disassembling And Assembling Relay Components - Emerson Fisher 3660 Instruction Manual

Instruction Manual
Form 5265
March 2006
INPUT
DIAPHRAGM
ASSEMBLY
LEVER TO INPUT
MODULE MOUNTING
SCREW
A4042-1/IL
4. Install the new diaphragm assembly (key 28), and
secure with the four cheese head screws (key 7).
5. Depress the feedback lever assembly (key 19)
inward until it stops on the housing, and tighten with
the retaining screw (key 19P).
6. With the input pressure set at either 1.4 or 2.4 bar
(20 or 35 psig), check for leaks between the
diaphragm assembly and the housing.
7. Refer to the Calibration section for the calibration
procedure.
Disassembling and Assembling Relay
Components
Before disassembling the relay components, remove
the positioner from the actuator. Refer to the
Removing the Positioner from the Actuator section.
Refer to figure 24 or 25 for key number locations.
1. To disassemble the relay valve assembly (key 2)
or restrictor assembly (key 4), unscrew these parts
from the back of the positioner and replace with new
parts.
The relay valve assembly (key 2) and the restrictor
assembly (key 4) are marked with the letters V and
P, respectively on the removal screws. For correct
location purposes, these same letters appear on the
back of the positioner case.
2. Unscrew the two captive cover screws, and
remove the cover. Loosen the retaining screw (key
19P) and pull the feedback lever assembly (key 19)
out slightly to release the range spring (key 30)
tension. Remove the range spring (key 30).
SPRING
TAB
LEVER MOUNTING
SCREWS
Figure 22. Flapper and Lever Alignment
3660 and 3661 Positioners
FLAPPER ALIGNED
PARALLEL
ADJUSTING
SCREW / FLAPPER
ALIGNMENT
SPRING TAB
ALIGNED OVER
CENTER OF
NOZZLE
3. Remove the cheese head screw (key 7) from the
lever assembly (key 17) and the diaphragm
assembly (key 28).
4. Remove the two cheese head screws (key 7) that
hold the lever assembly (key 17) to the housing and
lift off the lever.
5. Remove the four cheese head screws (key 11)
and four washers (key 98). Lift off the flapper
(key 9), flapper spring stop (key 99), flapper spring
(key 10) and cover plate assembly (key 8). Lift out
the output diaphragm assembly (key 29) and spring
(key 3).
6. Reassemble the relay parts in the following order,
spring (key 3), output diaphragm assembly (key 29),
cover plate assembly (key 8), flapper spring
(key 10), and flapper spring stop (key 99). Install the
four washers (key 98) and four cheese head screws
(key 11), and then tighten the screws. When
tightening the two screws that secure the flapper
spring (key 10), position the spring so the spring tab
is aligned over the center of the nozzle and the
flapper is parallel as shown in figure 22.
7. Reassemble the lever assembly (key 17) with the
two cheese head screws (key 7). Do not tighten the
screws until the adjusting screw (key 18) to flapper
(key 9) and tapped hole in the diaphragm assembly
(key 28) are aligned (refer to figure 22). Then,
tighten the lever assembly and install the screw in
the diaphragm assembly.
8. Carefully lift the flapper spring at the location
shown by key 10. Install the flapper (key 9) so that
the desired letter (D or R for direct and reverse) is
nearest the adjusting screw (key 18). When inserting
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