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Old 11-20-19, 12:05 PM   #4
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While R290 operates in the same neighborhood as R22, it doesn't even come close to r410s requirements. 410 runs at nearly twice the pressure with a different mass flow rate. If you installed r290, the btu output would drop 1/3 to 1/2 of rating, and since it's an inverter system, it would likely shut down on safety as low charge or erroneous SH readings. Sorry, this one's a no go.

Good luck with the fix though!
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