Xylem MM 706B User Manual

Replacement Switch Assembly

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5 Burner/Pump Control
5-M Burner/Pump Control – Manual Reset
7B Proportional Control
7B-M Proportional Control – Manual Reset

For Series:
93 94
193 194
Pump Controller/Low Water Cut-Off

INSTRUCTION MANUAL

MM-706B

Replacement Switch

Electrical Ratings

Models with 5 and 5-M Switch

Pump and Burner Switch Contact Ratings

Voltage Pilot Duty Only

120 VAC

240 VAC

CAUTION

WARNING

345 VA

• 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.

Models with 7B and 7B-M Switch

Switch Ratings

Burner Valve

120 VAC

345 VA 0 - 135 ohms @ 24 VAC

240 VAC

WARNING

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

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STEP 1 - Removal and Replacement of Contacts and Terminal Panels

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ON

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ON

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ON

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a. Turn power off to boiler and all controls.

Allow boiler to cool to 80˚F (27˚C) and

educe the pressure to 0 psi (0 bar).

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CAUTION

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

b. Remove and Replace Switch Assembly

• Remove two screws (A) and lift off

switch cover.

• Identify terminal connections for
rewiring and then disconnect all wires
from terminal panels.

• Remove conduit connector and wires
from the integral fitting hub.

• Remove four hex nuts (B) and carefully
lift switch assembly up and off

tower tube.

• Carefully slide new switch assembly
over tower tube and secure with four
hex nuts (B). Make sure nameplate is
in same position as old unit.

• Remove two screws (A) and lift switch
cover off new unit.

• Install conduit fitting from old unit
with attached wires on switch assembly.

• Reconnect wiring to terminal panel in
exactly the same position as removed.

• Replace switch cover and fasten with
two screws (A).

Proceed to Step 2 to Test Control

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