The fuel Quantity should be tested if the heater has difficulty
starting or maintaining a flame, using graduated cylinder part
# 5520004
(CA0 05 006)
10ml.
Note:
Measure the fuel quantity when the battery is
sufficiently charged. At least 11V and at
most 13V should be applied at the control
unit duringmeasurement.
Preparation
• Removemetering pump cover in the cases of SC ver-
sions.
• Pull the fuel line off the combustion chamber and insert
into a graduatedmeasuring glass.
• Switch the heater on, when fuel delivery is uniform
(approximately 40 seconds after switching on), the fuel
line is full and bled.
• Switch heater off.
• Emptymeasuring glass and replace.
Measurement
• Switch heater on.
• Fuel delivery starts automatically approximately 40
seconds after switching on.
• Hold the graduatedmeasuring glass at the glow pin
height duringmeasurement.
• After 90 seconds of fuel delivery, it will shut off
automatically.
• Switch heater off.
• Read off quantity of fuel delivery in the graduated
measuring glass.
If measured quantity of fuel is over or under the nominal
value, themetering pumpmust be replaced or fuel restriction
eliminated.
28
Maintenance / Troubleshooting / Repair
Fuel QuantityTest
Evaluation
HydronicD4WSC HydronicD5WSC HydronicD5WS
HydronicB4WSC HydronicB5WSC
HydronicB5WS
8.4 cm
3
/ 90 seconds 9.5 cm
3
/ 90 seconds 8.6 cm
3
/ 90 seconds 11.3 cm
3
/ 90 seconds 11.9 cm
3
/ 90 seconds
Max
7.3 cm
3
/ 90 seconds 8.5 cm
3
/ 90 seconds 7.6 cm
3
/ 90 seconds 10.1 cm
3
/ 90 seconds 10.7 cm
3
/ 90 seconds
Min
Diesel
Gasoline
