Settings - Webasto Air Top 2000 STC Workshop Manual

Air Top 2000 STC
6.3

Settings

6.3.1 Setting the CO
The CO content in the exhaust gas is set using the
2
adjustment knob on the control element. At a constant fan
speed, the volume of fuel is controlled by changing the fuel
pump cycle.
ATTENTION
The CO measuring instruments must be calibrated.
2
The heater must be switched off.
1. Connect the CO line to the negative terminal.
2
2. Turn the adjustment knob on the control element to mid-
position. The heater starts up and automatically assumes
partial load mode.
The operation indicator lamp flashes in the same way as for
a control unit fault when the heater is ready to be adjusted.
Diesel heaters:
3. Set the CO value by correspondingly turning the
2
adjustment knob. Turning the adjustment knob
anticlockwise reduces the CO
knob clockwise will increase the value. The measured
CO content at partial load (1 kW) must be at 6.6 ±0.5%.
2
After adjustment, the CO
10.3 ±0.5 vol.%.
Petrol heaters:
3. The CO content should only be measured with the
2
heater at operating temperature. For this purpose, the
heater should be operated for at least 8 minutes. The CO
content is then set to 7.3 ±0.5 vol.% at partial load (1
kW). After adjustment, the CO
should be 10.3 ±0.5 vol.%.
Diesel and petrol heaters:
4. When the CO value is in the permissible range,
2
disconnect the CO line from the negative terminal. This
2
saves the setting.
The heater will now run in normal mode again and can be
switched off at the control element.
The heater is set at the factory to match the fan motor.
content
2
NOTE
value while turning the
2
content at full load should be
2
content at full load
2
NOTE
6.3.2 CO setting for reference heater
2
The reference heater is set at the factory to 10.3 vol.% CO
at a geodetic altitude of 0 m. To subsequently reset the
heater, a CO value must be set as a function of the geodetic
2
altitude as shown in the diagram.
See Section 6.3.1.
CO [vol.%]
2
min. tolerance for operation [vol.%]
max. tolerance for operation [vol.%]
2
6 Function checks
Geodetic altitude [m]
2
603