Removing Contaminants From The Refrigerant Circuit; Cleaning The Refrigerant Circuit With Compressed Air And Nitrogen - Skoda Citigo 2012 Workshop Manual

Citigo 2012 ➤ , Fabia 2000 ➤ , Fabia II 2007 ➤ , Fabia II 2009 ➤ , Fab ...
Air conditioning system with refrigerant R134a - Edition 10.2014
7 Removing contaminants from the re‐
frigerant circuit
⇒ "7.1 Cleaning the refrigerant circuit with compressed air and
nitrogen", page 52
⇒ "7.2 Cleaning refrigerant circuit with refrigerant R134a (flush)",
page 54
⇒ "7.3 Principle circuit diagrams for different rinsing cycles", page
58
⇒ "7.4 Adapter for setting up the rinsing cycles", page 61
7.1

Cleaning the refrigerant circuit with compressed air and nitrogen

In order to remove impurities as well as aged refrigerant oil in a
clean refrigerant-saving and environmentally friendly manner,
without demanding installation, the refrigerant circuit is flushed
out with refrigerant R134a or is blown through with compressed
air and nitrogen.
Note
Blowing through the refrigerant circuit with compressed air and
nitrogen requires considerably more work than flushing with re‐
frigerant R134a. When flushing with refrigerant R134a, the clean‐
ing of the components is better and more effective, one should
therefore always flush if there is a problem.
The refrigerant circuit or the individual components must be blown through first with compressed air and then
with nitrogen, if:
♦ it is not possible to flush the refrigerant circuit with the refrigerant R134a.
♦ dirt or other impurities has/have entered into the circuit.
♦ When evacuating a tight refrigerant circuit the vacuum gauge is not constant (there is humidity in the re‐
frigerant circuit and builds up pressure)
♦ If the refrigerant circuit has been left open for longer than normally required for repairs (e.g. following an
accident).
♦ If pressure and temperature measurements indicate that there is humidity in the refrigerant circuit
♦ There is any doubt about the oil volume in the refrigerant circuit.
♦ the A/C compressor needed to be replaced because of internal damage (in this case it is preferable to flush
with refrigerant R134a
♦ required after replacing one of the components of the Workshop Manual.
Blowing through the refrigerant circuit
WARNING
♦ Nitrogen may leak uncontrollably from the bottle.
♦ Only work with reduction valve for nitrogen cylinders (max‐
imum working pressure: 15 bar).
♦ The gas mixture emanating from the components must be
exhausted via a suitable exhaust system.
52
Rep. gr.00 - Technical data
⇒ "7.2 Cleaning refrigerant circuit with refrigerant R134a (flush)", page 54 ).