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| Compare the value displayed in indication field 4 (corresponding to sender -G263-) with the values in the diagram. |
A - | Air temperature measured by the evaporator outlet temperature sender -G263- |
C - | Acceptable tolerance range |
The air temperature measured should be within the specified tolerance range, according to the ambient temperature, after 5 minutes. |
Note If these values are not reached, compare the measured values in fields „1“ and „4“: |
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| When the measurement value in field „1“ is smaller than the value in field „4“, the sender -G263- must be checked for its correct installation and if the electrical connection has a contact resistance. In this case, the damaged sender must be replaced. |
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| If the measured value in field „1“ is the same as field „4“, locate the fault if it differs from the theoretical value. |
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| Compare the measured values indicated in fields „4“ and „1“ (corresponding to sender -G263- and to sender -G191-). The measured value in field „1“ (of the outlet temperature sender -G191-) may be a maximum of 3°C higher after 5 minutes. |
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| If the measured value in field „1“ is more than 3°C higher than the value in indication field „4“, locate the fault if the temperature increases after the evaporator. |
t
| Temperature of air flow from „central“ dashboard vents can also be measured using digital thermometer -SAT 4002-. |
t
| The air conditioning function is, e.g. to detect due to the fact that the refrigerant pipe cools at the low pressure side (wide duct). |
t
| If the sender temperature -G191- is too high, locate the fault if the temperature increases after the evaporator. |
Note t
| The pressure in the refrigerant circuit depends on various influencing factors. Nevertheless, if the ambient temperature is between 20 and 25°C, the pressure generally does not exceed 20 bar. In extreme conditions (e.g. in southern countries with high ambient temperatures, „driving in traffic queues“ and in relatively high humidity) the pressure may reach 31 bar in virtue of the extremely high refrigeration performance involved in these cases. |
t
| At ambient temperatures below 25°C, the pressure in the refrigerant circuit does not usually exceed 16 bar (the refrigerant liquid fan operates at speed 1 and cools the condenser). So that the pressure can reach 16 bar, to activate speed 2 of the fan, you can briefly close the air inlets in the bonnet and bumper, for example. |
t
| Through the cycle proportion (indication field 4) the -E87- calculates the prevailing pressure in the refrigerant circuit. |
t
| When the period proportion is less than 12.5 % (equivalent to approx. 1.5 bar absolute pressure) and more than 87.5 % (equivalent to approx. 32 bar absolute pressure), the -E87- compressor will not activate (the control valve -N280- will not be activated). The compressor is only re-activated after the cycle proportion exceeds 12.5% (equivalent to 1.5 bar absolute pressure) or had dropped below 84% (equivalent to 29 bar absolute pressure). |
t
| So that it is not necessary to deactivate the compressor repeatedly due to excessively high pressure in the refrigerant circuit or an excessive refrigerant liquid temperature, the -E87- limits its performance: |
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| As soon as the pressure in the refrigerant circuit exceeds 30 bar (absolute pressure) (maximum compressor performance will not be enabled until the pressure has dropped below 27 bar). |
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| As soon as the refrigerant liquid temperature exceeds 115°C (at 118°C it is fully deactivated). |
t
| If the pressure in the refrigerant circuit exceeds 32 bar (cycle proportion greater than 87.5%), the -E87- only re-activates the compressor when the pressure has dropped below 29 bar (cycle proportion below 84%) |
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