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SAFETY WARNINGS
n WARNING! Risk of electrical shock. Pumps are
supplied with a grounding conductor and grounding-
type attachment plug on the power cord. To reduce
the risk of electrical shock, be certain that it is
connected only to properly grounded, grounding-type
receptacle. DO NOT cut off ground pin or use an
adapter fitting. DO NOT use an extension cord with
this pump. When wiring this pump follow all local
electrical, safety codes and ordinances as well as most
recent National Electric Code (NEC-ANSI/NFPA).
The MRG20 grinder pumps have a GROUND WIRE
that is connected to a screw in the metal motor
housing. This wire goes to the receptacle or control
WIRING SCHEMATIC – AO SMITH
WIRING SCHEMATIC
RUN
START
CAPACITOR
CAPACITOR
20 µF
324 µF - 389 µF
370 V
125 V
BROWN
BLACK
ORANGE
PHASE
®
PROTECTOR
SENSATA TECHNOLOGIES TYPE 15HM2412
WHITE
2
1
RED
BLUE
3
4
MAIN
5
6
YELLOW
box which must be connected to follow all local
electrical, safety codes and ordinances as well as most
recent National Electric Code (NEC-ANSI/NFPA).
CALIFORNIA PROPOSITION 65 WARNING:
This product and related
accessories contain chemicals known to the
State of California to cause cancer, birth
defects or other reproductive harm.
DISMANTLING PUMP FOR
REPLACEMENT PARTS
Before dismantling pump for replacement parts, clean
pump thoroughly.
WIRING DIAGRAM – MARATHON
LINE
LINE
RUN
CAPACITOR
3
®
START
CAPACITOR
23833A665 11/08/12
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