Refrigerant Circuit, Cleaning: Notes

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-- Perform the preliminary work for cleaning (flushing with refrigerant R1234yf). Refer to CLEANING THE REFRIGERANT CIRCUIT, PRELIMINARY WORK (FLUSHING WITH REFRIGERANT R1234YF) .

-- Check the refrigerant quantity in the A/C service station there must be at least 6 kg refrigerant R1234yf present. Refer to A/C service station Owner's Manual.

-- Empty the A/C service station container for used oil. Refer to the A/C service station Owner's Manual.

-- Connect the supply hose (high pressure side) of A/C service station to the low pressure line leading to the A/C compressor (line with larger diameter) using an adapter. Refer to ADAPTER FOR ASSEMBLING FLUSHING CIRCUIT .

-- Connect the return hose (low pressure- or intake side) of the A/C service station to the output of refrigerant circuit flushing device.

-- Connect the input on the refrigerant circuit flushing device to the high pressure line leading to the A/C compressor (line with smaller diameter) using an adapter. Refer to ADAPTER FOR ASSEMBLING FLUSHING CIRCUIT .

Flushing Circuit Block Diagrams. Refer to REFRIGERANT CIRCUIT, CLEANING .
Adapter for Assembling Flushing Circuit. Refer to ADAPTER FOR ASSEMBLING FLUSHING CIRCUIT .

NOTE:

Components are almost always flushed in the opposite direction of refrigerant flow when the A/C system is in operation. (Exception: the electrically-driven A/C compressor). Refer to REFRIGERANT CIRCUIT, CLEANING .

While flushing, contaminants from the refrigerant circuit enter the refrigerant circuit flushing device and the A/C service station and are absorbed by the filters and dryers installed there. Depending on the contaminant, these components are to be replaced in shorter intervals according to the operating instructions for the A/C service station or refrigerant circuit flushing device. Refer to A/C service station Owner's Manual.

The filter in the refrigerant circuit flushing device depends on the type and degree of contamination in the flushed refrigerant circuit, it should be changed after five to ten flushing cycles (flushed vehicles) at the latest. If a heavily contaminated refrigerant circuit is flushed (the refrigerant oil from the circuit is black and viscous or there are many shavings in the refrigerant circuit), the filter should be replaced after flushing. With a refrigerant circuit heavily contaminated in this way, it is wise to flush the circuit again after changing the filter.

Depending on the type of contamination, dirt (old refrigerant oil and abraded material from A/C compressor) is deposited on the viewing glass. If necessary clean the level indicator after flushing and flush the refrigerant circuit with a flushing procedure to check (one cycle is sufficient).

Liquid refrigerant cannot be led through the expansion valve, restrictor and desiccant bag of certain receiver/dryers at the necessary speed, therefore these components must be removed and replaced by adapters if necessary. Refer to REFRIGERANT CIRCUIT, CLEANING and REFRIGERANT CIRCUIT [For engine(s) CTUA, CAED, CREH, CEUC, CTGE, CREC, CYNB, CPNB]

Adapters for connecting the A/C service station and for bridging certain refrigerant circuit components. Refer to ADAPTER FOR ASSEMBLING FLUSHING CIRCUIT .