Xylem MM 221G Models 157S RBP MD Low Water Cut-Offs/Pump Controllers - Manual (Page 5)

5
b. Following the appropriate wiring diagram, (refer
to page 6) based on your application require-
ments, and using BX armored cable or Thinwall
electrical metal tubing connector fittings, make
electrical connections to the junction box (L).
PUMP
SWITCH
PUMP
CIRCUIT
TERMINALS
LOW WATER
CUT-OFF AND
ALARM SWITCH
ALARM
CIRCUIT
TERMINALS
LOW WATER
CUT-OFF
TERMINALS
L
IMPORTANT: There must be a minimum space
of 1/2" (13mm) between connector fittings and
electrical live metal parts.
• Mount 750BM module using 8 pin
socket base (supplied by others) in
Boiler Electrical Panel.
• Install electrical conduit between
Probe Housing and Boiler
Electrical Panel.
• Pull three (3) wires through conduit.
Boiler sight glass must be visible from location of
Control Box and must be within 25 feet of Control
Body.
NOTE
Refer to and follow local codes and standards
when selecting conduit and electrical fittings.
Probe wires must be in their own conduit. If they
are run in conduit with other wires, there may be
interference that can affect the performance of the
control.
NOTE
Wire must be 18 AWG stranded with glass braided
silicone jacket (UL 3071) suitable for high temper-
ature (200˚C) service.
NOTE
Snap Switches (Series 150S)
Installation of 750BM-P-120-CI