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ive crossed used 404 in a 134a motor and vice versa. 134a in 404 and r410 motors the big deal is to use ester oil which mixes with all 3 oils. miscible.

404 delivers a higher head pressure. so 404 in 134a motors are not real prepared for start-up. (warning).

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Brian Rolshoven

Lvl 2
2y ago
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9y ago

Yes

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Q: Can 134a refrigerant be mixed with 404a refrigerant?
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