Xylem MM 709B User Manual

!

Replacement Slide Wire Resistor

!

and Wiper Arm

7B-1R

For Installation on 7B or 7B-M Switch
Assemblies

INSTRUCTION MANUAL

MM-709B

Electrical Rating

Potentiometer Slide Wire Rating:

0 - 135 ohms @ 24 VAC

CAUTION

WARNING

• 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 exceed the switch contact rating.

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

Wiper Arm

WARNING

Resistor

STEP 1 - Removal and Replacement of Contacts and Terminal Panels

a. Turn power off to boiler and all controls.

Allow boiler to cool to 80˚F (27˚C) and
reduce the pressure to 0 psi (0 bar).

ON

CAUTION

There may be more than one source of power to
the boiler.

OFF