Xylem MM 201H Series 67 and 767 Low Water Cut-Offs For Steam Boilers - Manual (Page 12)

Xylem Inc.
8200 N. Austin Avenue
Morton Grove, Illinois 60053
Phone: (847) 966-3700
Fax: (847) 965-8379
www.mcdonnellmiller.com
McDonnell & Miller is a trademark of Xylem Inc. or one of its subsidiaries.
MAINTENANCE
SCHEDULE:
• Blow down weekly (at least once) when the
boiler is in operation.
• Disassemble and inspect annually. Replace
the low water cut-off if it is worn, corroded,
or if components no longer operate properly.
• Inspect the float chamber and equalizing
piping annually. Remove all sediment
and debris.
• Replace every 10 years. More frequent replace-
ment may be required when severe conditions
exist such as rapid switch cycling, surging water
levels, and use of water treatment chemicals.
PROCEDURE:
1. Blow down the low water cut-off when the
water level is at its normal level and the
burner is on. Fully open the blow down
valve and observe the water level fall in the
gauge glass. Close the valve after verifying
that the feeder contacts have closed and
the burner shuts off. If this does not happen,
immediately shut off the boiler and correct
the problem.
To prevent serious personal injury from steam and hot
water, make sure there is a discharge line from the
blow down valve to a proper place of disposal.
Failure to follow this caution could cause
personal injury.
! CAUTION
INSTALLATION COMPLETE
For All Installations
BOTTOM TOP LEFT RIGHT
The BX outlet (GG) on the control is movable
into any of the four positions by simply
removing the two black-headed screws and
rotating the housing.
© 2014 Xylem Inc. MM-201H March 2014 Part No. 246752