Magnetrol B60 Installation And Operating Manual - page 10
10
46-605 Flanged External Cage Float Actuated Liquid Level Switches
2.5
Replacement of Standard Float
and Stem Assembly
1. Disconnect wiring or medium lines from control and per-
form system shutdown. See
Troubleshooting, Section 3.0.
2. Remove switch housing assembly from float chamber at
head flange.
3. Remove sleeve stop strap from the underside of the head
flange and slide the float stem assembly out of the enclos-
ing tube.
NOTE: New float and stem kits are supplied unassembled. Refer to
Figure 9
for standard jam nut settings (Dimension A).
4. Check new float and stem assembly to be certain it is the
correct replacement unit:
a. Float should be of same physical size and shape.
b. Stem length should match closely.
c. Set attraction sleeve per Dimension A as shown in
Figure 9
.
NOTE: If differential adjustment has been altered in the field,
disregard Dimension A and readjust new assembly to the
previously determined level differential settings. S
ee Switch
Differential Adjustment, Section 2.4.
5. Replace new float and stem assembly into head flange and
install new stop strap with screws included.
6. Remount head flange on float chamber using new gasket
provided. Tighten flange nuts evenly, using an alternating
pattern typical of standard industry practice.
NOTE: Care must be taken during installation to be certain float stem
does not bend.
7. With control assembly in place, test switch actuation by
varying liquid level in float chamber.
NOTE: When reassembling the enclosing tube or the upper flange
assembly to the control, tighten according to the following
torque values.
0.03"
Minimum
gap setting
Top jam
nuts
Bottom jam
nuts
Attraction
sleeve
Enclosing tube
(ref.)
Stop tube
Sleeve
stop strap
Retaining
screws
Float and stem
assembly
Head
flange
(ref.)
Dim. A
.87 (22)
Figure 9
Model
Flange Bolting
Enclosing Tube
C29, D30
55–60 ft–lbs
200–225 ft–lbs
C60, J30, L30
100–125 ft–lbs
75–100 ft–lbs
B60
250–300 ft–lbs
200–225 ft–lbs