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Introduction
Safety
Mind with flammable refrigerants
Use of flammable refrigerants of the A2L safety classes and A3 (e. g. R1234yf or R290)
Work on systems with A3, A2L and B2L refrigerants
System design with highly flammable refrigerants
Suspicion of burnt refrigerant in terminal box
Dismounted components from systems with A3 or A2L refrigerants
Used oil from systems with A3 or A2L refrigerants
System design
Pipe layout and further components
Vibrations and sound
Avoiding damages due to critical pipe lengths
Particular notes on safe compressor and system operation
Pump down system
Tandem and trio operation
Verifying adequate oil level
Causes for oil loss
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