Xylem MM 702E Series 14-B Ball Type Blow Down Valve - Manual (Page 8)

Xylem Inc.
8200 N. Austin Avenue
Morton Grove, Illinois 60053
Phone: (847) 966-3700
Fax: (847) 965-8379
www.xyleminc.com/brands/mcdonnellmiller
McDonnell & Miller is a trademark of Xylem Inc. or one of its subsidiaries.
MAINTENANCE
SCHEDULE:
• Blow down weekly when the boiler is
in operation.
• Disassemble and inspect annually. Replace
the control if it is worn, corroded, or if com-
ponents no longer operate properly.
• Inspect the float chamber and equalizing
piping annually. Remove all sediment
and debris.
• Replace the blow down valve every 10 years.
More frequent replacement may be required
if it is used in locales where significant water
treatment is required, where more frequent
cleaning is necessary, or in applications with
high make-up water requirements.
PROCEDURE:
1. Blow down the low water cut-off when the
water level is at its normal level and the burner
is on.
Slowly open the blow down valve until it
is fully open and observe the water level fall in
the gauge glass. Close the valve after verifying
that 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
pipe blow down, connect a drain pipe to avoid
exposure to steam discharge.
Failure to follow this caution could cause
personal injury.
!
CAUTION
© 2013 Xylem Inc. MM-702F July 2013 Part No. 210286