| Draining refrigerant circuit using A/C service station |
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| Depending on the type of equipment chosen, there may be variations in the required procedure (always follow user's manual for the equipment being used). |
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| The refrigerant circuit must be discharged if parts of the refrigerant circuit must be removed, if there is uncertainty about the quantity of refrigerant in the circuit or if safety measures require it. |
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| All important operating instructions associated with the A/C service station for working with refrigerants can be found in the A/C service station operator's manual. |
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| Connect A/C service station to service connections as described in the user's manual for the vehicle → Rep. Gr.87 and bring into operation. |
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| The possibility cannot be excluded that, along with the refrigerant, refrigerant oil is extracted from the refrigerant circuit. In order to ensure the lubrication of the air conditioner compressor, the refrigerant oil quantity should be topped up with fresh oil → Rep. Gr.87. |
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| On vehicles with A/C compressor and no magnetic coupling (with A/C compressor control valve, air conditioning system -N280-) the engine should not run for longer than is absolutely necessary with empty refrigerant circuit and closed refrigerant circuit (the A/C compressor runs with it continually). The engine speed must not exceed 2500 rpm. |
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| On vehicles with A/C compressor and magnetic coupling, the engine may be started as the air conditioning system pressure switch -F129- or high pressure sender -G65- (checks whether refrigerant is in the circuit) switches off the magnetic coupling as soon as there is no refrigerant in the refrigerant circuit. |
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