Xylem McDonnell & Miller 1575 Series Instruction Manual
Xylem McDonnell & Miller 1575 Series Instruction Manual

Xylem McDonnell & Miller 1575 Series Instruction Manual

Low water cut-off/pump controller

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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,
installation, and maintenance of plumbing, steam, and electrical and/or systems in
accordance with all applicable codes and ordinances.
• To prevent serious burns, the boiler must be cooled to 80°F (27°C) and the pressure must be
0 psi (0 bar) before servicing.
• To prevent electrical shock, turn off the electrical power before making electrical connections.
• 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.
• We recommend that secondary (redundant) Low Water cut-off controls be installed on all steam
boilers with heat input greater than 400,000 BTU/hour or operating above 15 psi of steam
pressure. At least two controls should be connected in series with the burner control circuit to
provide safety redundancy protection should the boiler experience a low water condition.
Moreover, at each annual outage, the low water cut-offs should be dismantled, inspected,
cleaned, and checked for proper calibration and performance.
• To prevent serious personal injury from steam blow down, connect a drain pipe to the control
opening to avoid exposure to steam discharge.
• To prevent a fire, do not use this low water cut-off to switch currents over 7.4A, 1/3 hp at
120 VAC or 3.7A, 1/3 hp at 240 VAC, unless a starter or relay is used in conjunction with it.
• This product can expose you to chemicals including Lead, which is known to the State of
California to cause cancer and birth defects or other reproductive harm. For more
information go to: www.P65Warnings.ca.gov.
INSTRUCTION MANUAL
212634
MM-286D

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Summary of Contents for Xylem McDonnell & Miller 1575 Series

  • Page 1 INSTRUCTION MANUAL MM-286D 212634 • 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, installation, and maintenance of plumbing, steam, and electrical and/or systems in accordance with all applicable codes and ordinances. • To prevent serious burns, the boiler must be cooled to 80°F (27°C) and the pressure must be 0 psi (0 bar) before servicing. • To prevent electrical shock, turn off the electrical power before making electrical connections. • 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.
  • Page 2: Electronic Control Unit

    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 inj ury or death. CAUTION: • A more frequent replacement interval may be necessary based on the condition of the unit at time of inspection.
  • Page 3: Specifications

    SPECIFICATIONS M a x i mum Pressure: 150 psi (10.5 kg/cm ELECTRICAL RATINGS & SWITCH RATINGS Supply Probe Full Load (Amps) Locked Rotor (Amps) Pilot Duty (VA) Motor (HP) Voltage Voltage NO (NC), VAC NO (NC), VAC NO (NC), VAC NO (NC), VAC 120 VAC 5 VAC...
  • Page 4: Switch Settings

    SPECIFICATIONS (cont.) SWITCH SETTINGS: When the water level in the boiler drops below the When the water level in the boiler drops below the middle probe, the circuit is broken which will longest probe, the circuit is broken which will a c t i vate the pump relay, turning the pump on.
  • Page 6: Step 2 - Electrical Wiring

    STEP 2 - Electrical Wiring WARNING • To prevent electrical shock , turn off the electrical power before making electrical connections. • This low water cut-off must be installed in series with all other limit and operating controls installed on the boiler.
  • Page 7: Wiring Diagrams

    WIRING DIAGRAMS Low Water Cut-Off, Alarm and Pump Up Control • Connect wire “ a ” from power supply to FROM BURNER OR ALARM t e rm inal “ H ” . CONTROL CIRCUIT BCOM • Connect wire “ b ” from neutral supply to TO ALARM t e rm inal “...
  • Page 8: Exterior Lights

    STEP 3 - Testing I M P O RTA N T: Follow the boiler manufacturer’s start-up and operating instructions along with all applicable codes and ordinances. Exterior Lights • Green light on: Unit has power • Red light on: Boiler water dropped below the longest probe for longer than the adjustable time delay setting.
  • Page 9: Installation Complete

    The boiler should begin to fill with wa t e r. N OT E : If water does not start filling the boiler, immediately turn off the the boiler and make the necessary corrections. For Automatic Reset Models: When the water level reaches the level of the middle probe, the burner circuit should be acti- vated and the Red LED should turn off.
  • Page 10: Troubleshooting

    Troubleshooting Green LED does not turn on. Burner does not turn off when water level is • There may be no power to the unit. Check wiring below longest probe. connected to ‘H’ and ‘N’ terminals on circuit board. • The probes may be fouled with dirt, scale or rust. Verify that the control is being powered when the Remove and inspect probes.
  • Page 11: Maintenance

    MAINTENANCE BLOW DOWN PROCEDURE: CAUTION SCHEDULE: To prevent serious personal injury from steam Blow down control as follows when boiler is in pipe blow down, connect a drain pipe to the operation. control opening to avoid exposure to steam discharge. •...
  • Page 12: Commercial Warranty

    Xylem Inc. 8200 N. Austin Avenue Morton Grove, Illinois 60053 Phone: (847) 966-3700 Fax: (847) 965-8379 www.xylem.com/mcdonnellmiller McDonnell & Miller is a trademark of Xylem Inc. or one of its subsidiaries. © 2019 Xylem Inc. MM-286D March 2019 Part No. 212634...

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