Xylem MM 704B User Manual

No. 2 Switch

WARNING

CAUTION

Applications: For series 47, 247, 63, 51, and 53 water feeders to add the low water cut-off function.

OPERATION

Electrical Ratings

INSTRUCTION MANUAL

MM-704B

No. 2 Switch

Motor Switch Rating (Amperes)

Voltage Full Load Locked Rotor Pilot Duty

120 VAC 10.2 61.2 240 VAC 5.1 30.6

• 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 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.

125 VA at

120 or 240 VAC

WARNING

Failure to follow this warning could cause property damage, personal injury or death.

SCHEMATIC OF SWITCH OPERATION

Water Level Normal Burner On Alarm Off

Low Water Alarm Terminals

Low Water Cut-Off Terminals

N.O. N.C.

Water Level

Low

Burner Off

Alarm On

N.O.

N.C.

The No. 2 Switch will help to maintain a minimum

WARNING

CAUTION

water level in the boiler during normal operation. The switch will shut off the burner in the event the boiler water level falls. Once the water level is restored to its normal level, the switch will allow the burner to operate.

INSTALLATION –

TOOLS NEEDED:

One (1) flathead screwdriver and one (1) 5/16” socket wrench.

STEP 1 - Switch Installation

a. Remove the four (4) screws that secure the

cover plate (A) or the existing switch.

b. Mount the new switch on top of the control (B)

using the (4) screws. The No. 2 switch can be positioned with the conduit opening facing toward or away from the float chamber. These are the only positions in which the switch will function properly. See drawing at right.

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