Xylem MM 244B Series 42S Replacement Snap Switch Assembly - Manual (Page 8)

F
ADD ADHESIVE HERE
8
BURNER
SET SCREW
BURNER
SWITCH
E
4b. If the cut-off point does not match the one
shown in chart for the control (page 3) as
measured on the "Switch Level Ruler," using
an awl, dig the inspection lacquer out of the
socket in the set screw (E) above the burner
switch in the actuator assembly.
c. Using an Allen wrench with a 5/64" hex, turn
the screw 1/4 turn:
- clockwise when viewed from top (if the
“Burner Off” point is too high)
- counterclockwise when viewed from top
(if the “Burner Off” point is too low )
4d. Turn the pump back on, allowing the boiler
to fill with water.
PUMP OFF
PUMP ON
BURNER
CUT-OFF LEVEL
AT CAST LINE
4a. Slowly bring the boiler water level down to
the point at which the burner cuts off. If the
burner does not shut off automatically by the
time the water level reaches 3/8" (9.5mm)
below the cast line on the unit body, shut the
burner off manually.
4f. Repeat steps a. through d. as necessary to
match the Burner Off point specification for
your model.
4 - Setting the Operating Points of the Burner Switch