
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.
TROUBLESHOOTING:
If
control
fails
to
operate, perform the
following
diagnostic
checks.
1. Check to
be
sure that the water level
in
the boiler is at or above the level of the probe.
2. Re-check all wiring to ensure proper connections as specified
in
boiler manufacturers
wiring diagrams.
3. Check to ensure that tape has not been used
on
the threaded connection of the probe to
the boiler.
4. Check the quality of the boiler water to ensure adequate conductance.
Boiler
Does Not Turn
Off
(when water
is
below probe)
• Turn off boiler and check boiler wiring connections.
• Turn off boiler, drain boiler and remove control to check if the tip of the probe
is
touching
a metal surface.
Boiler
Does Not Turn
ON
• Make sure water is above the level of the probe.
• Make sure probe is installed
in
a location where
an
air pocket cannot develop.
• Check boiler wiring connections.
Boiler
Does Not Turn
ON
and RB-24E Red LED
blinking
• Problem is wrong transformer 'V' harness.
• Turn off boiler and install correct transformer 'V' harness.
MAINTENANCE
SCHEDULE:
• Test the
low
water
cut-off
annually
or
more frequently.
• Remove and
inspect
the self-cleaning probe every 5 years.
• Replace the
low
water
cut-off
every 15 years.
NOTE
Clean probe by wiping with non-abrasive cloth and rinsing with clean water.
DO
NOT
use sharp instruments
to
remove any accumulations
of
rust or scale.
A
CAUTION
Replace Probe if:
•
PTFE
insulator is cracked or worn.
• Probe is loose.
Failure
to
foII owthis caution could cause
prope
rty
damage, personal injury
or
death.
xylem
Let's Solve
Water
© 2013 Xylem Inc. MM-277G July 2013 Part No. 210589
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