Johnson Pump F4B-19 Manuel D'instructions page 7

rated capacity to accept ampere draw
of motor. Low voltage will cause motor
to overheat.
Wiring table
Max
0.2 m
Terminal
+
–
fuse
Black
Green/yellow
Other electrical devices, eg switch,
circuit breaker, must be installed
between the pump and the positive (+)
lead on the battery (on the red wire).
Wiring dimensions
(based on 3% voltage drop)
Wire size
2
2,5 mm # 14 AWG
2
4 mm # 12 AWG
2
6 mm # 10 AWG
2
10 mm # 6 AWG
2
16 mm # 4 AWG
2
25 mm # 2 AWG
* The wire length is the total distance from the
battery to the pump and back to the battery.
It is recommended to use a relay with a light
wire from main cable to switch to shorten the
main leaders.
When the pump is used as bilge pump
Max total head 6 m.
The pump must be installed so that
the motor is protected from splash
from bilge water.
The pump must be fitted with a
strainer or other means of preventing
debris from entering the pump.
Red
Switch
Pump
Max wire
lenght* in m
12 V 24 V
2,7 11,0
4,4 17,6
6,6 26,3
11,0
17,6
27,4
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Self-priming
Pump is self-priming up to 4 m. Intake
lines must be air-tight to ensure self-
priming. Note: Pump will prime when
impeller is dry but suction lift up to 4 m
is only obtainable when impeller is
greased or lubricated with liquid being
pumped.
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. The
normal working temperature of the
motor is +80°C.
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.
Caution
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.
Temperature
Max ambient temperature: +60°C.
The life of the impeller depends on
the temperature of liquid being
pumped. Temperatures between +5°C
and +60°C give normal life. Higher or
lower temperature will reduce the life.
ENGLISH
7