| -A- Pressure at the high-pressure end of the refrigerant circuit in bar (absolute) |
| -B- Signal ratio of the square-wave signal |
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| As soon as there are no compressor shut-off criteria, the operating and display unit for air conditioner/Climatronic -E87- switches on the compressor (by actuating the air conditioner compressor regulating valve -N280-): |
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| If there is a signal ratio greater than 12.5 % (corresponding to approx. 1.5 bar absolute) and less than 87.5 % (corresponding to approx. 32 bar absolute) |
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| If the signal ratio is less than 12.5 % or greater than 87.5 %, the compressor is not switched on (the air conditioner compressor regulating valve -N280- is not actuated). |
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| The signal ratio and the pressure calculated by the operating and display unit for air conditioner/Climatronic -E87- are displayed in the measured value block in display group “001” → Chapter |
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| An absolute pressure of 0 bar represents an absolute vacuum. Therefore normal ambient pressure is equivalent to approx. 1 bar absolute. On the dials of most pressure gauges 0 bar is equivalent to an absolute pressure of one bar (recognisable by the datum -1 below 0). |
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| The operating and display unit for air conditioner/Climatronic -E87- switches the radiator fans -V7- to speed 1, independent of the pressure in the refrigerant circuit, as soon as the compressor is switched on: |
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| The operating and display unit for air conditioner/Climatronic -E87- switches the radiator fans -V7- to speed 2. As soon as the pressure in the refrigerant circuit exceeds approx. 16 bar (absolute pressure) (the duty factor becomes greater than 47%). If the pressure drops below 13 bar (signal ratio drops below 40%), the fans are switched back to speed 1. |
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