Thermo E 200 / 320 5 Troubleshooting and error correction
513
5.5.10 Fuel pump inspection
ATTENTION
The pump pressure of the fuel pump is adjusted to a
fixed value in the factory.
It is not permitted to change the pump pressure.
The fuel pump and fuel hoses must be replaced after
5 years.
An admixture of up to 30% FAME to Diesel fuel is permit-
ted.
NOTE
If FAME is used, commonly designated as biodiesel,
the fuel pump and fuel lines must be replaced accord-
ing to the latest technical information / notification.
The following inspections should be performed prior to
testing the pump pressure:
•Is the CO
2
content properly adjusted?
• Do the combustion chamber, atomizer nozzle and
burner motor correspond to the heating capacity
class?
• Does the motor reach nominal speed?
• Is the fuel temperature 15...25°C?
• Are available check valves in the fuel supply and
return lines opened?
• Was the fuel filter in the fuel supply line replaced?
• Are the filters (screens) in the pump inlet clean?
• Is the fuel delivered without bubbles?
Attach a transparent hose for testing.
• If the specified exhaust values cannot be reached
after inspection and consideration of this error
sources, the fuel pump is to be replaced.
The pump pressure can be checked as follows.
The pump pressure adjustment is not permitted.
• In a workshop (not in the vehicle) fix the burner head.
• Disconnect motor and solenoid valve connectors from
control device.
• Ensure fuel supply.
• Screw a pressure gauge into the nozzle holder.
• Hook-up the motor and the solenoid valve with a 24V
power supply (Observe the rotation direction of the
motor! Pointer on the fan wheel).
• Read the pressure at the pressure gauge.
• Dismantling in reverse order.
Fig. 507
Flame detector
Window
Disc
Fig. 508
At 24.0V Pump pressure
Thermo E 200 8 +1 bar
Thermo E 320 9 +1 bar
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