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| Solar mode is only possible with the sun roof closed or tilted (the solar energy converted into electrical energy by the solar roof is supplied to the vehicle electrical system via contacts -A- (at front edge of sun roof) and -B- (at sun roof frame)). |
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| On vehicles with no solar roof, all air conditioner control motors come to a halt in their instantaneous position when the ignition is switched off. Ventilation of the passenger compartment in solar mode does however require the fresh-air and recirculated-air flaps to be set to “fresh-air mode”. On vehicles with solar roof, the operating and display unit, Climatronic control unit -J255- is therefore informed by way of the encoding that the vehicle is fitted with a sun roof with solar cells -C20-. The operating and display unit, Climatronic control unit -J255- then moves the flaps in the air conditioner unit to the “fresh-air mode” position after switching off the ignition. |
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| The energy supplied by the solar cells -C20- is transferred via the fresh air blower control unit -J126- directly to the fresh air blower -V2-. The fresh air blower -V2- converts the electrical energy generated into blower power. |
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| The fresh air blower control unit -J126- interrogates the voltage at the input of the solar cells at regular intervals when the ignition is switched off (no signal detected by operating and display unit, Climatronic control unit -J255-) and converts the voltage generated by the solar cells in such a manner that the fresh air blower -V2- runs at the maximum possible speed if sufficient solar energy is being generated. |
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| The electrical energy supplied by the solar cells -C20- is approx. 12 W with a sunlight penetration of 500 W/m2: |
| 500 W / m2 (sunlight penetration) x 0. 21 m2 (sun roof solar area) x 0.13 (efficiency of solar cells -C20-) x 0.9 (efficiency of fresh air blower control unit -J126-). |
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| Contacts -A- and -B- (at sun roof and sun roof frame) for transferring the electrical energy generated must be clean and free from normal lubricant. |
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| If necessary, contacts -A- and -B- can be coated with a small quantity of contact grease (electrically conductive preservative and lubricant available from electronics dealers). |
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Note
