"End heater operation by switching off in full or partial load operation", function

W83.70-0017-09

1 Timer
2 Control module
3 Glow pin
4 Temperature sensor
5 Burner
6 Heat exchanger
7 Overheating sensor

V Combustion air
A Exhaust
KE Coolant inlet
KA Coolant outlet
KS Fuel

8 Coolant circulation pump
9 Burner housing
10 Flame sensor
11 Combustion air blower
12 Exhaust line with muffler
13 Combustion air line
14 Fuel metering pump
15 Automatic heater control panel

Function sequence

 Heater switched on with timer (1) for auxiliary heater.

 Heater operating in full load or partial load range.

 The heater is switched off manually with the timer (1). The heater switches to the cooling phase with shut-off delay:

- The fuel supply is interrupted immediately by switching off the fuel metering pump (14).

- The blower for the vehicle heater is switched off.

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- The combustion air blower (11) continues to run for
210 seconds cooling the combustion chamber and purging any combustion gases.

- The coolant circulation pump (8) is switched off after 210 seconds.

 After completion of the cooling phase with shut-off delay all components for the heater are switched off.

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Operating state after switching off the heater

After switching off the heater with the timer the following components remain in operation:

 Cooling phase with shut-off delay

Combustion air blower, low stage = 1850 rpm

Fuel metering pump = off

Coolant circulation pump = running

Blower for vehicle heater = off

Operating state upon completion of cooling phase with shut-off delay

After completing the cooling phase with shut-off delay all heater components are shut off:

 Heating operation terminated

Combustion air blower = off

Fuel metering pump = off

Coolant circulation pump = off

Blower for vehicle heater = off