Xylem MM 307H Series 101-A Electric Water Feeder - 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:
Annually
• Disassemble and inspect/clean strainer screen.
Replace if screen is torn or not able to be cleaned.
• Remove and inspect/clean cartridge. Replace if
poppet does not move freely or debris cannot be
removed.
• Check all wires for brittle or worn insulation.
More frequent cleaning or replacement may be
required if used in locations where water treatment
is required or in applications with high make-up
water requirements.
Replace entire unit including equalizing piping every
10 years.
Replace control if it has been subjected to water from
a broken pipe or flooding.
NOTE
Use clean water to rinse components and surfaces. DO
NOT use sharp objects to scrape off any accumulations
of sediment or debris.
X
Z
TO BOILER
Feed�
Valve By-Pass�
Valve
Check Valve
WATER�
SUPPLY
Make sure that the water level in the boiler is above the
closing level of the feeder.
Close valve 'X' and slowly open union 'Z' to determine if
valve is leaking.
• If water is leaking from the union, the valve needs
to be serviced.
• If no water leaks from the union, the feeder opera
tion is not the cause of the flooding.
Broken Union Test
E
D
B
H
x 4
A. Using a 1/2" socket wrench, unscrew the four (4) hex-head
bolts (B) that secure the strainer basket (H) to the valve
assembly (E).
B. Using a 13/16" socket wrench, unscrew the cartridge (D)
and remove.
C. Clean any debris (scale, rust, etc.) from strainer and cartridge.
Poppet inside cartridge must move freely. Replace if debris
cannot be removed or poppet does not move freely.
D. Lubricate cartridge o-rings using silicone type lubricant and
re-install.
E. While depressing the manual feed (red) button, re-install the
cartridge and tighten 2 ft. lbs. (2.6 N•m). Do not over-tighten.
F. Re-install strainer basket. Tighten (4) bolts 8 ft. lbs. (11 N•m).
Removal of cartridge and strainer for inspection and cleaning
© 2013 Xylem Inc. MM-307H July 2013 Part No. 246761