0400 - Function description D. Electrical function, control unit (Webasto no.105.499) Auxiliary heater

83-400

Function description

D. Electrical function, control unit as of approx. 08/86 (Webasto no.
105.499)

Note

3. Repeat start:

The following functions of this control unit

If combustion does not occur during the

(N33)

first start, the combustion air blower

have been modified or added:

continues running for 30 seconds.
Thereafter, a second start is performed

1. Undervoltage cutout:

automatically. If this also does not result

If the power supply drops below 9.5

in combustion, the combustion air blower

0.5 volts during the cut-in period, the

continues running for 60 seconds. The
total time to a fault cut-off is increased

auxiliary heater switches off. The

from the previous 4 minutes to 5 1/2

auxiliary heater can only be restarted

minutes.

after it is switched off and on again.

4. After-running controller of combustion

2. Glow plug monitoring:

air blower after interruption of

If the glow coil of the glow plug or the

combustion:

power supply is interrupted, the control

If combustion is interrupted, e.g. because

unit switches to fault. The combustion air

of a shortage of fuel, a photo-transistor in

blower continues running for approx. 60

the flame monitor assures optically

seconds. The operating indicator lamp

controlled after-running of the

then goes out and the auxiliary heater

combustion air blower. This is limited to

switches off. No automatic repeat start is

max. 80 seconds. Thereafter, the

performed as before.

electronically controlled after-running of
60 seconds commences, as before.

5. Temperature-switching points

Coolant temperature in heater (°C)

Full load to part load

Part load to full load

Start of combustion interval

End of combustion interval (full-load start)

ty funkcj

aktualizacji.

strona 1