6Operating Tests DBW 2010 / 2016
606
6.3.6 Checking burner motor
NOTE
The combustion air fan is checked when installed. If the set-
point states are not reached, then the fan motor must be
replaced.
Test
– Examine bearing condition (stickiness) of burner motor.
– Measure input voltage on heater
– Switch on heater
– Measure speed (speeds must be within specified speed
ranges at nominal voltage)
DBW 2010: 4,500 ± 100 / min.
DBW 2016: 5,000 ± 100 / min.
6.3.7 Checking solenoid valve
NOTE
A leaky valve seat of the solenoid valve is indicated by longer
continued smoking of the heater in run-on. In this case, fuel
continues dripping via the atomiser nozzle.
Brief continued smoking is normal. This is carried out by emp-
tying the space between the solenoid valve and the nozzle
hole.
Test
IMPORTANT
Disconnect the connector of the solenoid valve at the control
unit and connect to external power supply.
Failure to observe this can result in damage to the control
unit.
– Check electrical operation with 12 V devices in accord-
ance with data below:
• Opening voltage 8.5 V
• Operating voltage 9.6 to 14.4 V
• Power consumption at nominal voltage and 20 °C
10 W
• Nominal current 0.83 ampere
– Check electrical operation with 24 V devices in accord-
ance with data below:
• Opening voltage 17. V
• Operating voltage 19: to 28.8 V
• Power consumption at nominal voltage and 20 °C
10 W
• Nominal current 0.42 ampere
6.3.8 Checking nozzle holder pre-heating unit
(optional component)
NOTE
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.
The power consumption is 130 ± 13 W with 12 V or 24 V.
Test
– Swing or remove burner head
– Disconnect connector from nozzle holder
– Connect ohmmeter to connector
– Cool thermostat with refrigerant spray or bypass
– Resistance value (max. 4.5 ohms).
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