Install Instructions

McDonnell & Miller
8200 N. Austin Ave.
Morton Grove, IL 60053
tel: [phone]
fax: [phone]
www.mcdonnellmiller.com
McDonnell & Miller
©2009 ITT Corporation
Printed in U.S.A. 5-09 210441
TROUBLESHOOTING:
If control fails to operate, follow 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 Teflon tape has not been used on the threaded connection of the probe to
the boiler.
4. Check the quality of the boiler 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-24 Red LED blinking
• Problem is wrong transformer ‘Y’ harness.
• Turn off boiler and install correct transformer ‘Y’ harness.
MAINTENANCE
SCHEDULE:
• Test the low water cut-off annually or more frequently.
• Remove and inspect the self-cleaning probe every 5 years.
• Replace probe every 10 years.
• Replace the low water cut-off every 15 years.
Replace Probe if:
• Teflon® insulator is cracked or wo r n .
• P r obe is loose.
Failure to fo l l ow this caution could cause pro p e r ty damage, p e rsonal injury or death.
CAUTION
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.
NOTE