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.
© 2012 Xylem Inc. MM-303G October 2012 Part No. 246779
MAINTENANCE
SCHEDULE:
• Inspect the water feeder annually. Replace it if it is worn, corroded, or if components no longer operate
properly.
•Replace the water feeder every 10 years. More frequent replacement may be required when severe
conditions exist such as rapid switch cycling and surging water levels.
• Disassemble and carefully clean strainer screen at least twice a year.
STEP 4 - Troubleshooting
If the unit fails to feed water as required, perform the following diagnostic checks:
1. Recheck all wiring to ensure proper connections, as specified in these instructions.
2. Check to insure that the integral strainer is clean and free of debris and sediment.
3. Check to ensure proper operation of low water cut-off controls connected to water feeder.
STEP 3 - Testing
a. Open the inlet valve (X) and the outlet
valve (Y). Check for any leakage.
If there are any leaky connections, close
the inlet and outlet valves and correct
the problem.
b. Tu rn the boiler’s electric power
on and fill
it to the manufacturer's
recommended
normal water level by depressing the red
manual feed button (Z) on the water
feeder.
X
Y
FEED
INDICATOR
MANUAL
FEED
UNI V ER S AL W ATE R FE E DER
U
NI -
M
AT CH
ITT
McD o n nel l & M i lle r
Ch ic ag o, I L U. S. A.
Z
B
c. Check the water feeder (B) operation by performing the following steps:
1. Slowly drain water from the boiler.
2. The burner should turn off when the water level drops below the cut-off level of the LWCO, which
will activate the water feeder's delay feed cycle.
3. Feeder should turn on to feed water to boiler after delay period has expired.
NOTE: Delay period is determined by position of selector. Unit is shipped
with switch in Position 3. Refer to chart on page 2 for alternate settings.
4.
Feeder will be deactivated when water level is restored to level as determined by LWCO.
NOTE: McDonnell & Miller Series PS LWCO's have a 15 second DOM (Delay on Make) to restore
water level in boiler to an appropriate level without overfeeding.
Consult other manufacturer's LWCO
installation literature
for DOM times.
5.
Repeat steps to ensure feeder is operating satisfactorily.
6.
Using the manual feed button, restore the water level in the boiler to the proper operating level.
If burner does not turn off when water level falls below level of LWCO, turn
off power to boiler and check operation of LWCO.
WARNING
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