Option C Wiring - Xylem McDonnell & Miller PSE-800-M Low Water Cut-off Application, Installation, Operation, And Maintenance Manual

1. Factory jumper bar
2. Boiler connections
3. Service switch
_ _ _ _ Dashed lines indicate existing wires.
_____ Solid lines indicate new wires.

Option C wiring

Wiring a new manual reset LWCO to a boiler with a Model 67 LWCO. Voltage of the new
manual reset LWCO must be the same voltage as the burner circuit.
1. Remove existing wire from terminal 1 of the Model 67 LWCO and connect it to
Terminal B of the new manual reset LWCO.
2. Connect a new wire from terminal 1 of Model 67 LWCO to terminal H of the new
manual reset LWCO.
3. Connect a new wire to terminal N of new manual reset LWCO and splice it to the
existing neutral wire.
PSE-800-M Low Water Cut-off Installation, Operation, and Maintenance Manual
Existing wiring to boiler
3
N H
120 VAC
New wiring to boiler
N H C W B
(L1)
2
(L1)
3
N H
120 VAC
Installation
1
(L1)
2
(L1)
11