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Xylem McDonnell & Miller 67 Series Instruction Manual
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Xylem McDonnell & Miller 67 Series Instruction Manual

Xylem McDonnell & Miller 67 Series Instruction Manual

Low water cut-offs for steam boilers
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INSTRUCTION MANUAL
MM-201H
Series 67 and 767
Low Water Cut-Offs
For Steam Boilers

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Summary of Contents for Xylem McDonnell & Miller 67 Series

  • Page 1 INSTRUCTION MANUAL MM-201H Series 67 and 767 Low Water Cut-Offs For Steam Boilers...

  • Page 2: Operation

    OPERATION Maximum Steam Pressure: 20 psi (1.4 kg/cm Electrical Ratings Pump Circuit Rating (Amperes) Voltage Full Load Locked Rotor Pilot Duty 120 VAC 44.4 125 VA at 240 VAC 120 or 240 VAC 22.2 Note: 11 MV is rated at 24 VA @ 24 VAC to 120 VAC The Series 67 and Series 767 low water cut-offs are a 2-1/2"...
  • Page 3 STEP 2 - Preparation a. Turn the boiler off. b. Drain the water in the boiler to a level which is below the lower gauge glass tapping (B) of the control body (A). Allow the boiler to cool to 80˚F (27˚C) and allow the pressure to release to 0 psi (0 bar).
  • Page 4 c. Using an adjustable wrench, install a a" (9.5mm) NPT compression fitting base (K) to the upper tapping (L) in the control (A). Tighten to 31 ft•lb (42 N•m). d. Using a pipe wrench, install a 2" (13mm) nipple (M) into the upper tapping (N). Tighten to 31 ft•lb (42 N•m).
  • Page 5 g. Position the tubing (Q) next to the compression fitting (K) and, using a pencil, mark the tubing (Q) for proper insertion into the compression fitting (K). Remove the tubing (Q), and, using the tube cutter, cut the tubing to its proper length. h.
  • Page 6 k. Using two (2) pipe wrenches, rotate the upper tee (P) clockwise and the lower tee (J) counter- clockwise so that the end of the tube can be inserted into the lower compression fitting (K). NOTE: Make sure that the control is in a hori- zontal position.
  • Page 7 b. Install the control (A) by rotating it onto the 22" (63.5mm) nipple (X, as shown in Step a on previous page). Tighten to 109 ft•lb (148 N•m). c. Using a pipe wrench, install a w" (19mm) NPT pipe (T) into the opening of the blow down valve (U) and tighten to 47 ft•lb (64 N•m).
  • Page 8 STEP 4 - Electrical Wiring Directory: 67 Low Water Cut-Off and Uni-Match Water Feeder page 8 - 9 67 Low Water Cut-Off and 101 Water Feeder page 10 - 11 For 67 Low Water Cut-Off Installed with McDonnell & Miller Uni-Match Water-Feeder WARNING •...
  • Page 10 For 67 Low Water Cut-Off Installed with McDonnell & Miller Series 101-A Water-Feeder a. Using a flathead screwdriver, remove the one (1) screw that secures the low water cut-offs switch housing (Y). b. Using a flathead screwdriver, remove the two (2) screws that secure the feeder cover (BB).
  • Page 11 For the 24V Burner/24V Feeder setups. c. Connect the "hot" wire from the boiler trans- former to terminal #2 of the low water cut-off. BURNER 120 VAC Connect the "hot" side of the water feeder SUPPLY transformer to terminal #3 of the low water cut-off.

  • Page 12: Installation Complete

    Xylem Inc. 8200 N. Austin Avenue Morton Grove, Illinois 60053 Phone: (847) 966-3700 Fax: (847) 965-8379 www.mcdonnellmiller.com McDonnell & Miller is a trademark of Xylem Inc. or one of its subsidiaries. © 2014 Xylem Inc. MM-201H March 2014 Part No. 246752...

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Mcdonnell & miller 767 series