Graymills MVP User Manual

Multi-Stage
Centrifugal
MVP Pumps

Operations and Maintenance
Instructions

WARNINGS/CAUTIONS
Read all these SAFETY INSTRUCTIONS BEFORE
installing or using this equipment. Keep this
manual handy for reference/training.

 Inspect unit for damage. Report any damage to

carrier/dealer immediately.

 Pump may be heavy. If in doubt, take appropriate

precautions.

 Motor must be grounded and suitable for the

environment in which it is used. Do not use where
explosion-proof motors are required.

 Do not allow liquids to come into contact with the

motor, or any electrical components.

 Never attempt any service work while the unit is

still connected to any electrical power source.

 This pump contains rotating parts. Use caution.
 When working on or around pump, be aware of

what liquid is/has been pumped. If liquid is
potentially harmful, take appropriate precautions.

 Never use any part of the wiring/electrical system

to lift or move the equipment. This could cause a
failure of the electrical system, resulting in severe
shock or death.

 Do not operate this pump or allow others to

operate it until the instructions and warnings have

been read and are understood by all involved.
Never work with equipment you feel may be unsafe.
Contact your Supervisor immediately.

DESCRIPTION/SPECIFICATIONS

The Graymills MVP Series pumps are multi-stage
centrifugal pumps designed to handle clean, water and
water-based coolants.

795-91725

3-07

www.graymills.com

 Minimum and maximum liquid temperature range: -

0

C to 930C(500F to 2000 )

10

 Maximum Air Temperature 40
 Maximum viscosity 500 SSU
 Maximum On/Off Cycles per hour: 100
 Maximum inlet pressure 100 psi.
 Pipe connections are 1" NPT for both inlet and

discharge.

 Bypass kit is included and should be used for

applications where low flow conditions can exist.
See Installation Section, Page 2.

 Rotation: left hand, ie, COUNTERCLOCKWISE

when viewed from motor end.

0

C (1040 F)

POWER SUPPLY, WIRING AND
GROUNDING

WARNING

Install ground and wiring according to local and
National Electrical Code requirements.

 Install a disconnect switch on all power legs near

the pump.

 Disconnect and lockout electrical supply before

installing or servicing pump.

 230/460V, 3 phase, 60 cycle AC circuit rated for a

minimum of 10 amps. Refer to motor nameplate for
instructions.

- 1 -

 Electrical supply MUST match pump’s name plate

specifications. Incorrect voltage can cause fire

and/or damage to the motor and voids warranty.
 Motor overload protection standard on three-phase

motors.
 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.

 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

 Incorrect rotation may cause damage to pump in

and will void the warranty.
 Correct rotation is left-hand,

COUNTERCLOCKWISE when viewed from the

motor end.
 Rotation can be verified by quickly energizing the

pump for an instant with a quick on/off motion.
 To reverse three phase motor rotation interchange

any two power supply leads.

PIPING

 Piping should be no smaller than the pump

discharge. Piping should be kept as short as

possible, avoiding unnecessary fittings to minimize

friction losses.
 All piping MUST be independently supported and

MUST NOT place any piping loads on the pump. It

should “line up” naturally.
 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.

Bypass Kit (included)

Figure 1

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.
 Minimum and maximum liquid levels must be

maintained for proper pump operation.
See Figure 1.

 Allow adequate space for servicing and ventilation.

Protect from freezing and flooding

 The pump must be installed in a ventilated area,

and the ambient temperature must not exceed 40
C (104

 Before installation, verify that motor and pump are

rotating well by rotating the motor fan.

0

F)

.

0

- 2 -

WARNING

 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.