Xylem MM 235E Replacement Snap Switch Assembly SWA 150S 150S MD 158S 159S User Manual
Page 7
7
C
D
5a. Locate the actuator assembly (C) and the two fillister head
screws (D) which secure it to the bearing of the control.
b. Clean the inspection lacquer out of the screw slots in the two fil-
lister head screws.
c. Remove the two screws holding the actuator assembly in place
using a flat head screwdriver. Remove actuator assembly and
place aside for reinstallation.
G
7a. Reattach the actuator assembly using the two fillister head
screws (G) and torque to 30 - 40 in. lb. (34.5 - 46 cm. kg.).
b. Apply a drop of the supplied adhesive to the threads of
each fillister head screw.
6a. Remove the two Torx
®
screws (E) holding the switch bracket
assembly in place using a flat head screwdriver or a Torx
®
T30 wrench.
b. Take the new switch bracket assembly out of the package
and place the bagged supplies to one side while discarding
the insert.
NOTE: Refer to the chart on page 2 to make sure you have
the proper switch bracket assembly for your control. The
switch bracket assemblies are not interchangeable.
c. Install the new switch bracket assembly (F) into the junction
box in the same orientation as the old switch bracket assem-
bly (i.e. with arrows on the bracket pointing toward the termi-
nal block).
d. Secure the new assembly with Torx
®
screws (E) and torque
to 80 - 140 in. lb. (92 - 161 cm. kg.).
9. Reattach the cover (H).
Proceed with normal operational checks of controls as described in Step 2 “Checking Switch Settings and
Adjusting Switch Setpoints at Operating Pressure”; or Section 3 “Checking Switch Settings at "0" Pressure”.
The pump or burner switch operating points should be within +/- 1/8" of those specified for your control.
H
SECTION 1 - Switch Bracket Replacement (continued)
E
F
8. Reconnect the pump switch and burner/ alarm switch wires
to terminal block as noted when disconnected and torque to
13 - 17 in. lb. ( 15 - 19.5 cm. kg.) (Refer to "Terminal
Connection Chart" on page 6 if unsure of proper switch to
terminal block wire connections).
Note:
Cover must be installed correctly as shown