Start-Up Procedure; Dry Running - Johnson Pump WD 3.5 Bedienungsanleitung

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Wiring table
Max 0.2
+
–
Black
Green/yellow
Other electrical devices, eg switch, circuit breaker,
must be installed between the pump and the posi-
tive (+) lead on the battery (on the red wire).
Wiring dimensions
(based on 3% voltage drop)
WD 2.9
Wire size
1,5 mm² # 16 AWG
2,5 mm² # 14 AWG
4,0 mm² # 12 AWG
6,0 mm² # 10 AWG
WD 3.5
Wire size
2,5 mm² # 14 AWG
4,0 mm² # 12 AWG
6,0 mm² # 10 AWG
10 mm² # 6 AWG
10
m
Terminal
Switch
fuse
Pump
Max wire
lenght* in m
12 V 24 V
5
8
13
19
Max wire
lenght* in m
12 V 24 V
3
6
8
14
WD 5.2
Wire size
Red
2,5 mm²
4,0 mm²
6,0 mm²
10 mm²
16 mm²
* 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.

Start-up procedure

After pump installation, the system
can be started by using the following
procedure:
• Make sure suction hose is connected
to the water supply.
• Open the spray nozzle and start
the pump.
• Close the spray nozzle when water
21
begins flowing and all air has been
34
purged from the system.
55
• If additional spray nozzles or taps are
82
in use after the pump, open each
additional nozzle/tap until all air has
been purged from the system.
• Pump will cut off after taps are
closed and pressure builds to the
setpoint of the pressure switch
16
Self-priming
25
The pump is self-priming up to 2m for
38
WD 2.9, 2,5m for WD 3.5 and 2,5m
63
for WD 5.2 and. The inlet pipe must be
airtight to ensure self-priming

Dry running

Pump will not be damaged by shorter
period of dry running. It will, however,
unnecessary reduce your battery power.
Max wire
lenght* in m
12 V 24 V
# 14 AWG 3
# 12 AWG 6
# 10 AWG 8
# 6 AWG 14
# 4 AWG 22 100
Original instructions
16
25
38
63