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Electrical connections
Fig. 39: Electrical connection of nozzle preheater for heaters with
control unit 1553
80
Item Description
B5
Thermostat
F3
Fuse
12V = 16A / 24V = 8A
G
Battery
K6
Relay
for nozzle preheater
R2
Resistance (heating
cartridge)
S1
Switch
W2
Wiring harness
X1
Plug connection
4-pin
A
installed in the heater
B
supplied loose
C
only if required
D
provided in vehicle
included in standard kit
may be supplied depending on model
DBW 160/230/300/350
Remarks
A B C D
for nozzle preheater
Vehicle fuse DIN 72581
for nozzle preheater
on - off
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