Xylem MM 273E Model 750-HW-MT-120 Probe Type High Water Manual Reset Control Unit - Manual

Model 750-HW-MT-120
Probe Type High Water
Manual Reset Control Unit
Applications:
Conductance type control for steam boilers
when a manual reset high water alarm or
cut-off is required.
5-1/2"
Model 750-HW-MT-120
Probe Type High Water
Control Unit
Model 750-HW-MT-120
Control Unit
• Before using product, read and understand instructions.
• Save these instructions for future reference.
• All work must be performed by qualified personnel trained in the proper application, installation,
and maintenance of plumbing 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 80˚F (27˚C)
and allow pressure to release to 0 psi (0 bar) before servicing.
• To prevent an electrical fire 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 control can be installed in series with all other limit and operating controls installed
on the boiler. After installation, check for proper operation of all the limit and operating
controls, before leaving the site.
• When using mixed voltages, do not jumper from terminal 1 to terminal 3.
• 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.
WAR NING
CAU TION
!
WARNING
INSTRUCTION MANUAL
Failure to fo llow this warning could cause property damage, personal injury or death.
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.
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.
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MM-273E