Maintenance, Schedule, Procedure – Xylem MM 702E Series 14-B Ball Type Blow Down Valve User Manual

Page 8: Caution

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