407C in a Flooded Chiller

[tempest tech]

I came across a chiller that was converted from R22 to 407C. I know this is incorrect for many of the obvious reasons. Most of my chiller experience is with flooded ammonia systems. With that out of the way I'm hoping that I may get some good recommendations of a replacement refrigerant. I want to tell them 507. The process is chilled water. Process temp is 33F. Air cooled system with a vilter 350 recip. Thanks in advance.

[Poodle Head Mikey]

What are the negative indications about the job as it is now?

PHM
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I came across a chiller that was converted from R22 to 407C. I know this is incorrect for many of the obvious reasons. Most of my chiller experience is with flooded ammonia systems. With that out of the way I'm hoping that I may get some good recommendations of a replacement refrigerant. I want to tell them 507. The process is chilled water. Process temp is 33F. Air cooled system with a vilter 350 recip. Thanks in advance.

[tempest tech]

Poor oil return and the fact that you shouldnt use a blend unless it direct expansion.

[pecmsg]

Why not back to R-22

[tempest tech]

If it were my choice thats what would happen but the customer thinks 22 is too expensive. Its only a 500lb charge.

[jayguy]

Why not back to R-22

x2

[R123]

Why not back to R-22

X3

[DANI25486]

R22 in Europe is forbidden. If the retrofit involved the change of Mineral to POE, you shouldnt have oil return problems. About the glide of R407C yes thats a problem for efficency of the HE. However if the system is semi-flooded it shouldn´t be bad.

[Nuclrchiller]

Carlos, could you please describe "semi-flooded"?

[DANI25486]

Carlos, could you please describe "semi-flooded"?

Yes. I mean chillers with a flooded evaporator and also an expansion device, for example u have Carrier 30GX or Trane RTHA/B/C/D.

[Nuclrchiller]

Thank you, Carlos. Here, we call it simply "flooded". I wondered if maybe you were talking about something different. I see now that you were not.

[R123]

Yes. I mean chillers with a flooded evaporator and also an expansion device, for example u have Carrier 30GX or Trane RTHA/B/C/D.

All chillers have an expansion device.

[DANI25486]

All chillers have an expansion device.

Yes your wright...what I mean to say was, it´s different to have a float valve then an expansion valve. Look to Carrier´s 30GX and 19XR, both evaporators are flooded, When conmpressor running you only can see liquid level in 19 XR, you cant in 30GX because of the EXV. Here we call this type of chillers semi-flooded.