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Air conditioning systems with refrigerant R1234yf - General information - Edition 07.2017
– Extract the mixture of refrigerant, refrigerant oil, compressed
air or nitrogen escaping out of the components with an extrac‐
tion system.
Note
Compressed air and nitrogen cannot be blown through the re‐
strictor, expansion valve, air conditioner compressor, receiver or
reservoir.
– In cases where condensers have a drying agent cartridge in
the integrated receiver, this drying agent cartridge must be re‐
moved.
Note
♦ With condensers in which the receiver / desiccant cartridge are
integrated and cannot be renewed individually, the condenser
lk
is to be renewed after cleaning (flushing).
♦ Depending on the version, receivers - in which the desiccant
cartridge is to be renewed individually - may feature an addi‐
tional filter element, which will need to be renewed with the
desiccant cartridge if necessary.
– First blow out old refrigerant oil and contaminants with com‐
pressed air, then blow out components with nitrogen (clean,
blow out or dehumidify old refrigerant oil).
– Adapter for connecting pressure hose to refrigerant circuit
Adapter case for VW/Audi passenger vehicles ⇒ Electronic
parts catalogue .
To prevent oil and moisture from the compressed air system
making its way into the refrigerant circuit, the following points must
be observed.
♦ The compressed air must be fed through a compressed air
cleaning unit to clean and dry it. Therefore, use a filter and
dryer for compressed air (included in the supply of tools for
paint systems) ⇒ Electronic parts catalogue .
♦ On refrigerant lines with threads or union nuts on the connec‐
tion, use adapter from refrigerant circuit adapter set - V.A.G
1785- ( adapter - V.A.G 1785/1- to adapter - V.A.G 1785/8- )
to connect the 5/8" - 18 UNF charges hose (one part of this
adapter is also included in the adapter case for VW/Audi pas‐
senger vehicles ).
♦ On refrigerant lines without thread or union nut on the con‐
nection (for connection of adapters), use adapter from adapter
case VW/Audi passenger vehicle set or proprietary air blow
gun with rubber nozzle.
Note
Always extract any escaping air and/or nitrogen from the compo‐
nents using appropriate local exhaust ventilation LEV (e.g. work‐
shop extraction system).
The refrigerant circuit (or individual components) must be blown
through if there are no means of flushing or flushing does not ap‐
pear to be the appropriate solution.
– if there is dirt or contamination in individual components of the
refrigerant circuit.
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Rep. gr.87 - Air conditioning system
GETth
English 