Xylem MM 283D Guard Dog Series 751P and Series 752P Probe Type Low Water Cut-Off - Manual

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• Before using this product read and understand instructions.
• Save these instructions for future reference.
• All work must be performed by qualified personnel trained in the proper application, instal-
lation, 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.
• 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.
connections.
To prevent electrical shock, turn off the electrical power before making electrical
•
• To prevent 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).
• To prevent electrocution, when the electrical power is connected to the control, do not
touch the terminals,or electrical wires.
Wh en using mix ed v oltag es, d o not j umper from terminal 1 to terminal 3 . •
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.
Failure to follow this warning could cause property damage, personal inj ury or death.
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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.
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