MP Pumps FRX-50_50R INSTALL - Manual (Page 2)

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FORM 3810A (09-07)
PIPING/MOUNTING:
The pump inlet and outlet has 1/2" NPT - 1" hose connections.
Use pipe sealant on the threads and other connections. The
base does not require direct mounting if one of the pipe
flanges is rigid mounted. Do not rigid mount both the flanges
and the base to avoid mounting tolerances that may distort
the motor base. Install the pump with the shaft in a
horizontal direction.
Never install the pump vertical with the motor below the
pump.
ELECTRICAL:
The motor must be protected from over current by using a
fuse or circuit breaker (see chart below for correct protection).
The proper minimum wire size is stated for each voltage
application. Make sure that the pump has the proper voltage
rating to match the installation power. Do not use or install if
the voltage on the label is different than the installation. All
wire connections must be secure and sealed to protect
arcing. Follow all local installation codes.
MOTOR VOLTAGE FUSE/CB WIRE SIZE
ON NAME PLATE AMPS AWG
12VDC 15 14
24VDC 10 16
110VAC 2 18
230VAC 1 18
OPERATION:
The pump should be operated with liquid in the pump
otherwise seal damage may occur. If an inlet valve is present,
the valve should always be completely open during
operation to avoid cavitation. An outlet valve may be used to
throttle the flow rate. Avoid repeated starts and stops; the
pump can operate for a long period of time without any flow.
DC motors are brush type and may emit a noise from the
brush that can sound like a squeal, this is normal. The pump
will be extremely quiet unless there is air in the system.
REPAIR AND MAINTENANCE:
The pump has a carbon/ceramic seal that may last several
thousand hours based upon the application. The motor is not
rebuildable after the brushes (DC) have worn to the limits. A
seal that leaks will show leakage through the slot between the
pump housing and the motor. Extreme leakage may damage
the motor bearings and contaminate the inside of the motor.