View Full Version : R404a to R407a Retrofit

31-08-2017, 11:17 AM
Hi All,

Due to the ever increasing price and the fact 404a is being phased out I've been tasked with coming up with a plan to change it to 407a. The system in question contains around 600kg and is a multipack system, which operates at around 8 degrees Celsius currently and will do for the foreseeable future.

In regards to the things being considered I've listed below things that may need changing in order to accommodate this change:
- TEV's
- Pressure Switches
- PRV's
- Drier Filters
- Schraeder Valves
- Compressor oil change

If I've missed anything please feel free to tell me, any advice would be much appreciated.


31-08-2017, 06:00 PM
Is R407a the best choice ?

Some alternatives maybe... http://bit.ly/2eswIeT

22-11-2017, 11:53 PM
Hi Jurgen
You've probably done this now, but I would have used R442a...
Unlike most of the other replacements, this is more efficient than R404a

24-11-2017, 08:44 AM
I have been using R448A and R449A for retrofitting from R404a and this has been the far simplest change out process with these two refrigerants.

Always change the oil!

05-02-2018, 08:51 AM
If I may know, the difference between refrigerant 404a and a [advert removed] is better suited for air conditioning engines.