r409

[willie]

doing refit on supermarket at moment systems have r409 on med temp finding gas has some very funny traits to it,pressure drops come and go,liquid levels vary gas seems to take long time to settle down ,people say its a hell of a gas to use because of glides any one else fund these problems

[Dan]

I know there are some wide glides with R409, but I am wondering if you have a witches brew of some other refrigerants in there. I have a small rack operating a kitchen in a large hotel and do not see the fluctuations you are seeing.

[lana]

HI there,

Maybe there is leak and the the remaining refrigerant is not R409 anymore.
OR there was a comisioning problems from the beginning. Like wrong refrigerant charging method or oil contamination ,....

Cheers

[nh3simman]

You get R409A and R409B.

Refrigerant Property Report
ISO Number R409A
Chemical Name R22/R124/R142B
Formula 60/25/15
Critical Point
Temperature 109.0 °C
Pressure 4330 kPa
Boiling Point
BP (at 1 atm) -34.4 °C
Glide (at BP) 8.6 °C

You are right, it has around the highest glide of the commonly documented refrigerants.

Even so, it should be stable in a system. I suspect that there is another problem here.