Install Instructions
INSTRUCTION MANUAL
MM-719
e-11M Control
Control for use on 24 or 120 VAC
systems requiring manual reset
on Series 64 and 67
Low Water Cut-Offs
Applications:
Secondary LWCO manual-reset control for
residential and commercial boilers of any
steaming capacity.
Primary LWCO for hot water boilers.
• Before using this product read and understand instructions.
• Save these instructions for future reference.
• All work must be performed by qualied personnel trained in the proper application,
installation, and maintenance of plumbing, steam, and electrical equipment and/or systems in
accordance with all applicable codes and ordinances.
• Boiler manufacturer schematics should always be followed. In the event that the boiler
manufacturer’s schematic does not exist, or is not available from the boiler manufacturer,
refer to the schematics provided in this document.
• To prevent serious burns,allow the control and surrounding equipment to cool to
80ºF (27°C) and allow pressure to release to 0 psi (0 bar) before servicing.
• To prevent electrical re or equipment damage, electrical wiring insulation must have a rating
of 167°F (75°C) if the liquid’s temperature exceeds 180°F (82°C).
• This low water cut-off must be installed in series with all other limit and operating controls
installed on the boiler. After installation, check for proper operation of all of the limit and
operating controls, before leaving the site.
• When using mixed voltages,do not jumper from terminal H to terminal C.
• To prevent electrocution, when the electrical power is connected to the control, do not touch
the terminals,or electrical wires.
• To prevent electrical shock, turn off the electrical power before making electrical connections.
• California Proposition 65 warning! This product contains chemicals known to the state of
California to cause cancer and birth defects or other reproductive harm.
• Previous controls should never be installed on a new system. Always install new controls on a
new boiler or system.
Failure to follow this warning could cause property damage, personal injury or death.
CAUTION:
• A more frequent replacement interval may be necessary based on the condition of the unit at
time of inspection. McDonnell & Miller’s warranty is one (1) year from date of installation or
two (2) years from the date of manufacture.
211989