possible conversion

[stanbyyourword]

yep 407c saturation temps are close enough to wing it with electronics im sure

[emcontrols]

Right on 407c!!!!!!!!

[Screwit]

I would have serious concerns "winging it" with R407c considering the glide when using a DX chiller vessel working off microprocesser staturated pressure/temperature properties of another refrigerant for the chillers safty protection.

I guess you could fit an external low pressure switch for protection but the chillers reliable operation would be compromised.

[heatingman]

I've seen R407c and R22 use the same thermal expansion valves in some cases.

I've seen it a lot on split systems.

The bigger problem on the rtwa will be oil separation capacity. POE oils blend with refrigerant a lot better then mineral oils, which is why no traps are needed on high temp split systems using poe oils.

[the-man]

Carrier just sent out some info on converting 22 to 407' on a 100 ton machine it's like 17k to convert it. I haven't seen the labor involved . I'm shure if trane would let you convert it would be in the same relm , may want to replace the machines. Don't think it's worth the cost to convert. I don't remember what they said about capacity. Dozed off during that meeting