Xylem MM 712C Series 51/51 S/53 Replacement Float and Large Bellows Assembly - Manual (Page 4)

A
B
F
Refer to the proper cam assembly figure below
a. Establish boiler water level at 5/8” to 1 1/8” (16-29mm)
below the low water cut-off casting line, or where control
previously turned burner off
b. Using a flathead screwdriver, turn eccentric screw (A)
until cam (F) is set in lowest possible position.
c. Slowly, turn eccentric screw (A) raising the cam (F) until
the switch activates, opening the common and normally
closed contacts. Hold eccentric screw (A) in position
and tighten nut (B) on the opposite end.
STEP 4 - Testing
STEP 3 - Setting the Cam
a. Check to see that the burner turns on and off at the proper water level, by raising and lowering the
water level in the boiler.
b. Make sure there is additional downward travel remaining in the float arm after the burner goes off.
c. Repeat test several times.
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Phone: (847) 966-3700
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© 2012 Xylem Inc. MM-712C August 2012 Part No. 210423