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BTW, a new txv shouldn't necessitate switching to R410. I recently did a txv swap on a 25 year old Carrier R22 system. You can still find the R22 txv's it's just a matter of pulling the part number off the existing txv and doing an online search or talking to a parts supplier who can cross reference the old number. It might require some new piping depending on how the old txv is connected in the system but it can be done.
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Nick
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