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Old 02-24-11, 02:26 PM   #586
AC_Hacker
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Quote:
Originally Posted by Xringer View Post
The 'study' implied that R290 could be a 'Drop-In' replacement for R410a,
and that R290 would cool better and use less power..

It seemed like they didn't have to make any mods..
But, the last part does recommend a change be made to the capillary tube..
To avoid very high "evaporating temperature"..
That would be the mod I had in mind.

I don't know if your unit has the cap tube or the TXV valve metering device. If it's the TXV, there is a possibility that the screw adjustment would do the trick. The screw will adjust over some range, don't know if swapping R-410a to R-290 would fall within that range.

Quote:
Originally Posted by Xringer View Post
`Even the manufacturer claim that R290 is suitable as
direct replacement for R22 andR410A (in the case of
this experiment), we found that minor modification
need to be done on the system.

`Suitable capillary tube should be change and follow
with further investigation.
You might want to do a little more research into refrigerant lubricant compatibility.

I do know that mineral oil lubricants are not soluble in R-410a, that's why the synthetic lubes.

I suspect, but I am not completely sure if the synthetic lubricants are soluble in R-270. My suspicion is that they are not.

If it was my project, I'd find out for sure.

-AC_Hacker
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