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  1. HVAC
    In the installation manual for a newer (somewhat higher SEER) Daikin outdoor compressor, in the "Pressure test and evacuating system" section starts off with a warning: Do not mix any substance other than the specified refrigerant R410A into the refrigeration cycle. I think most HVAC people...
    daikin nitrogen pressure test r410a
  2. HVAC
    During a recent checkup, my mom's Lennox 10 SEER HS29-261-2P 2 ton with Armstrong CAU24-1 indoor coil has developed a leak after 13 years of perfect service. I confirmed very low refigerant with low psi on both high and low sides. As I recall the low side was 0 and high 60. I've charged to...
    find leak nitrogen r-22 r22
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