Xylem MM 244B Series 42S Replacement Snap Switch Assembly - Manual (Page 9)

9
PUMP
ON
PUMP
OFF
BURNER
CUT-OFF LEVEL
AT CAST LINE
H
ADD ADHESIVE HERE
G
PUMP SET SCREW
PUMP SWITCH
5b. If the Pump Off point does not match the
one shown in chart for the control (page 3)
and as measured on the "Switching Level
Ruler", dig the inspection lacquer out of the
socket in the set screw (G) above the pump
switch in the actuator assembly using an
awl.
c. Using an Allen wrench with a 5/64" hex, turn
the screw 1/4 turn:
- clockwise (if the “Pump Off” point is too
high when viewed from top)
- counterclockwise (if the “Pump Off” point
is too low when viewed from top)
5d. Slowly drain the water in the boiler until the
pump turns on. Allow pump to fill the boiler
and observe the point on the ruler where
the water level shuts off.
PUMP
OFF
PUMP
ON
NORMAL BOILER
WATER LINE
3/4 " (19mm)
5a. Slowly drain the water in the boiler until the
pump turns on. Allow pump to fill the boiler
and observe the point on the ruler where the
water level shuts off.
5e. Repeat steps 5a. through d. as necessary
to match the specified Pump Off point spec-
ification.
f. Apply one drop of adhesive (furnished) to
the set screw threads (H) above the pump
switch in the actuator assembly.
5 - Setting the Operating Points of the Pump Switch