Xylem MM 709B Replacement Slide Wire Resistor and Wiper Arm 7B-1R For Installation on 7B or 7B-M Switch Assemblies - Manual

INSTRUCTION MANUAL
MM-709B
• 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.
WARNING
CAUTION
!
WARNING
Replacement Slide Wire Resistor
and Wiper Arm
7B-1R
For Installation on 7B or 7B-M Switch
Assemblies
Electrical Rating
Potentiometer Slide Wire Rating:
0 - 135 ohms @ 24 VAC
OFF
ON
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).
STEP 1 - Removal and Replacement of Contacts and Terminal Panels
Wiper Arm Resistor
There may be more than one source of power to
the boiler.
! CAUTION