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Xylem McDonnell & Miller MM-704B Instruction Manual

Xylem McDonnell & Miller MM-704B Instruction Manual

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No. 2 Switch
Applications:
For series 47, 247, 63, 51, and 53 water
feeders to add the low water cut-off
function.
OPERATION
Electrical Ratings
Motor Switch Rating (Amperes)
Voltage
Full Load
120 VAC
10.2
240 VAC
5.1
• 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.
• To prevent a fire, do not use this low water cut-off to switch currents over 10.2A, 1/2 Hp at
120 VAC or 5.1A, 1/2 Hp at 240 VAC, unless a starter or relay is used in conjunction with it.
Failure to follow this warning could cause property damage, personal injury or death.
Locked Rotor
Pilot Duty
61.2
125 VA at
120 or 240 VAC
30.6
!
WARNING
INSTRUCTION MANUAL
No. 2 Switch
®
MM-704B

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Summary of Contents for Xylem McDonnell & Miller MM-704B

  • Page 1 INSTRUCTION MANUAL MM-704B No. 2 Switch Applications: For series 47, 247, 63, 51, and 53 water feeders to add the low water cut-off function. No. 2 Switch OPERATION Electrical Ratings ® Motor Switch Rating (Amperes) Voltage Full Load Locked Rotor Pilot Duty 120 VAC 10.2...
  • Page 2 The No. 2 Switch will help to maintain a minimum water level in the boiler during normal operation. SCHEMATIC OF SWITCH OPERATION The switch will shut off the burner in the event the boiler water level falls. Once the water level is Low Water Water restored to its normal level, the switch will allow...
  • Page 3 STEP 2 - Electrical Wiring a. Using the flathead screwdriver, remove the two (2) screws that secure the switch housing (E). FIGURE 1 b. Using copper wire only, follow the wiring Used as a Mainline Switch diagrams in Figure 1 to wire the No. 2 and/or Low Water Alarm Neutral Switch.
  • Page 4 Xylem Inc. 8200 N. Austin Avenue Morton Grove, Illinois 60053 Phone: (847) 966-3700 Fax: (847) 965-8379 www.xyleminc.com/brands/mcdonnellmiller McDonnell & Miller is a trademark of Xylem Inc. or one of its subsidiaries. © 2012 Xylem Inc. MM-704B April 2012 Part No. 210529...