Graymills MVP Series Pump OMI - Manual (Page 2)

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ƒ Electrical supply MUST match pump’s name plate
specifications. Incorrect voltage can cause fire
and/or damage to the motor and voids warranty.
ƒ Motor overload protection standard on three-phase
motors.
ƒ Use only stranded copper wire to motor and
ground. The ground wire MUST be at least as
large as the wire to the motor. Wires should be
color coded for ease of maintenance.
ƒ
Follow motor manufacturer’s wiring diagram on the
motor nameplate or terminal cover carefully.
WARNING
Failure to permanently ground the pump, motor
and controls before connecting to electrical power
can cause shock, burns or death.
ROTATION
ƒ Incorrect rotation may cause damage to pump in
and will void the warranty.
ƒ Correct rotation is left-hand,
COUNTERCLOCKWISE when viewed from the
motor end.
ƒ Rotation can be verified by quickly energizing the
pump for an instant with a quick on/off motion.
ƒ To reverse three phase motor rotation interchange
any two power supply leads.
PIPING
ƒ Piping should be no smaller than the pump
discharge. Piping should be kept as short as
possible, avoiding unnecessary fittings to minimize
friction losses.
ƒ All piping MUST be independently supported and
MUST NOT place any piping loads on the pump. It
should “line up” naturally.
ƒ All joints MUST be airtight. Use 3 - 4 wraps of
Teflon™ tape to seal threaded connections.
CAUTION
Never draw piping into place by forcing the pump
discharge connections.
INSTALLATION
WARNING
Multi-stage pumps produce considerable shut-off
pressure. Hoses and associated plumbing used with
these pumps should be rated for a minimum working
pressure of 350 PSI. Failure to heed this warning could
result in ruptured lines and possible injury to personnel.
ƒ Minimum and maximum liquid levels must be
maintained for proper pump operation.
See Figure 1.
ƒ
Allow adequate space for servicing and ventilation.
Protect from freezing and flooding
.
ƒ The pump must be installed in a ventilated area,
and the ambient temperature must not exceed 40
0
C (104
0
F)
ƒ Before installation, verify that motor and pump are
rotating well by rotating the motor fan.
WARNING
ƒ Graymills recommends the use of an inlet strainer
to minimize the size and amount of debris that
enters the pump. Contamination drawn into the
pump can cause internal damage and is not
covered under warranty. Consult factory for
recommendations as to the appropriate size and
type of strainer to use.
Figure 1
Bypass Kit (included)