Xylem McDonnel & Miller 157S-RBP-MD Instruction Manual
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Xylem McDonnel & Miller 157S-RBP-MD Instruction Manual

Xylem McDonnel & Miller 157S-RBP-MD Instruction Manual

Low water cut-off/pump controller
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INSTRUCTION MANUAL
MM-221REVJ
210345

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Summary of Contents for Xylem McDonnel & Miller 157S-RBP-MD

  • Page 1 INSTRUCTION MANUAL MM-221REVJ 210345...

  • Page 2: Operation

    OPERATION Maximum Pressure: 150 psi (10.5 kg/cm Electrical Ratings Float Control Pump or Motorized Valve Alarm Circuit Rating Motor Horsepower Circuit Rating (Amperes) Voltage Amps Voltage Amps Voltage Full Load Locked Rotor Pilot Duty 120 VAC 120 VAC 120 VAC 44.4 345 VA at 240 VAC...

  • Page 3: Installation

    INSTALLATION – TOOLS NEEDED: IMPORTANT: Follow the boiler manufacturer's Two (2) pipe wrenches, one (1) flathead screw instructions along with all applicable codes and driver, and pipe sealing compound. ordinances for piping, blow down valve and water gauge glass requirements. STEP 1 - Determine the Elevation at Which the Low Water Cut-Off/Pump Controller Must be Installed Size the steam (top) and water (bottom)

  • Page 4: Step 3 - Electrical Wiring

    STEP 3 - 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 5 b. Following the appropriate wiring diagram, (refer IMPORTANT: There must be a minimum space to page 6) based on your application require- of 1/2" (13mm) between connector fittings and ments, and using BX armored cable or Thinwall electrical live metal parts. electrical metal tubing connector fittings, make electrical connections to the junction box (L).

  • Page 6: Wiring Diagrams

    WIRING DIAGRAMS Low Water Cut-Off Only 1. Main Line Switch - For burner circuits within 2. Pilot Switch - To holding coil of a starter when the the switch’s electrical rating. burner circuit exceeds the switch’s electrical rating. LINE LINE LOAD 4 5 6 4 5 6...
  • Page 8 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-221REVJ May 2019 Part No. 210345...

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