General Installation Sequence: Notes
NOTE:
Excessively high pressure in refrigerant circuit
- Risk of damage to air-conditioning compressor
→ Do not allow low-pressure gauge to go above 3 bar.
Information
- On air-conditioning service equipment with a transparent oil separator, read off and take note of the oil level before removing refrigerant.
- Do not carry out this step on empty air-conditioning systems (pressure gauge approx. 0 bar) because if you do, air will get into the refrigerant bottle.
- If the vehicle is cold, it may be necessary to repeat the suction procedure until all refrigerant has been removed from the air-conditioning system. This step is carried out automatically with some units.
Information
- There must be a minimum amount of refrigerant in the air-conditioning servicing equipment for flushing (at least 4 kg R1234yf and at least 8 kg R134a). The minimum quantity specifications for flushing the refrigerant circuit take precedence in the relevant operating instructions.
Information
- Instructions in the operating instructions for the air-conditioning servicing equipment take precedence. The procedure described here may differ from the description provided by the respective air-conditioning servicing equipment manufacturer.
Information
- Only when clear, totally colourless refrigerant flows through the inspection glass of the flushing device for refrigerant circuits into the air-conditioning servicing equipment is the refrigerant circuit cleaned.
- Flushing washes all refrigerant oil out of the refrigerant circuit (except for minute traces - but these can be ignored).
- If the refrigerant circuit is extremely dirty, it may be necessary to perform the flushing cycle twice (two flushing cycles with three flushing procedures each). Before starting the second flushing cycle, the filter on the flushing device must be replaced by a new filter (see Service Equipment and Special Tools Information).
Information
- If air-conditioning servicing equipment without programming is used for flushing, the procedure must be performed manually (evacuate, flush 4 times using at least 2 kg of refrigerant each time and extract the refrigerant again, evacuate).