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  1. Residential HVAC Forum
    Need a refrigerant/oil expert. Came across a job with an almost new 410a York split system where some hack thought R-22 and 410a were compatible refrigerants, and dumped a few pounds of 22 into it. (Before we knew what happened it hit 700psi high side and destroyed the low side gauge) I can...
    410 damage mixing
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