9Repair DBW 2010 / 2016
903
9.1.2.1 Installation of nozzle holder pre-heating unit
for DBW 2010 / DBW 2016 with 1553 control
unit
General information
The fuel to the atomiser nozzle is heated with the nozzle
holder pre-heating unit. At extremely low temperatures, mal-
functions can occur without nozzle holder pre-heating for
heaters specified above.
At a temperature of < 0 °C, the heating cartridge in the noz-
zle holder is connected with a thermostat. The heating dura-
tion is dependent on the reflected heat in the combustion
chamber and switches off at + 8 °C at the thermostat.
If no nozzle holder pre-heating unit is installed in the heater,
it can be retrofitted using the following procedure.
Following retrofitting, the following bags of spare parts are
provided for the heaters specified above:
• 12 V heaters with 1553 control unit,
Order No. 968 89A
• 24 V heaters with 1553 control unit,
Order No. 989 71A
The bags of spare parts contain the following parts:
1 heating cartridge
1 clamping yoke
1 relay
1 thermostat
1 wiring harness
1 lug
1 disc
1 nut
1 serrated lock washer
1 socket housing, 4-pin
1 socket housing, 2-pin
4 tab receptacles
Fig. 902 Installing nozzle holder pre-heating unit with 1553 control unit
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