The pump must be installed according to ISO 10133 (Small craft - Electrical system - Extra low
voltage DC installation for continuous current). Note: The fuse must be ignition protected.
The motor is equipped with built in thermal protection to prevent the motor from overheating.
The protection is automatically restored when the motor is cooled. If the pump is connected
with separate earth lead, this should be yellow/green and connected to the motor base. See
the wiring table above for correct installation. Negative wire must be black.
Choose wire size in accordance with total wire length (see table above). The wire connections
must be sealed with a marine sealant or sealed cable connectors. Other electrical devices,
eg switch, circuit breaker, must be installed between the pump and the positive (+) lead on
the battery (on the red wire). Note: Before installation with electrical control systems, check
that equipment to be used is of sufficient rated capacity to accept ampere draw of motor. Low
voltage will cause motor to overheat.
Self-priming
Pump is self-priming up to 3 m (for F4B 4 m). Intake lines must be air-tight to ensure
selfpriming.
Note: Pump will prime when impeller is dry but suction lift up to 3 m (for F4B 4 m) is only
obtainable when impeller is lubricated with liquid being pumped or Johnson Impeller lubricant.
For permanent installations where suction lift exceeds 4 m, a foot valve should be used to
assure priming on start up.
Continuous duty
For continuous duty 0,6 bar (60 kPa) maximum head is permissible. Normal working
temperature of the motor may reach approx. +80°C (surface temperature) which may burn your
skin.
Warning! Dry running
Do not run dry for more than 30 seconds. Lack of liquid will burn the impeller and damage the
seals.
If the pump is used for fuel oil transfer it should be equipped with a vacuum switch. When the
liquid has been evacuated the electric supply is automatically switched off.
Warning! Caution Explosion Hazard
Do not pump gasoline, solvents, thinners, highly concentrated or organic acids. If corrosive
fluids must be handled, pump life will be pro-longed if flushed with water after each use or after
each work day.
Warning! Caution. Explosion Hazard.
Never operate a motor which in any way has been manipulated and lost it’s full enclosure.
Temperature
Max ambient temperature: +60°C. The life of the impeller depends on the temperature of liquid
being pumped.
Temperatures b5°C and +55°C give normal life. Higher or lower temperature will
reduce the life.
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Original instructions
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