HVAC Commandments

[2024-11-24 Sun 22:48]

Thou Shalt

  • wear PPE
  • keep records
  • vacate
  • ventilate
  • read the data plate
  • comply with EPA changes
  • beware the ASHRAE 15
  • know the ASHRAE 34
  • abide by AHRI 740
  • know thine units, both US customary and metric.
  • know thine refrigerants (ASHRAE 13)
  • and thy safety/flammability index (A1, A2, A2L, B1, B2, the ASHRAE 34)
  • evacuate line sets below 500 microns
  • use low-loss fittings
  • flood with nitrogen
  • use alkylbenzene lubricant with HFOs
  • test thine recovery cylinders every 5 years
  • recover vented refrigerant when charging

Thou Shalt Not

  • mix refrigerants
  • leak refrigerants
  • inhale refrigerants1
  • burn refrigerants
  • use silicone or POE oils with HFOs
  • fill thine recovery cylinder above 80%
  • leave a piercing-type valve on when finished

Thou might enjoy

Endnotes

  1. Except, like, \(CO_2\) . thou may inhale \(CO_2\) .
  2. newton's laws
    1. an object in motion wants to stay in motion, an object at rest wants to stay at rest.
    2. force is mass times acceleration.
    3. for every action, there is an equal and opposite reaction.

Author: Nadya B.

Created: 2026-01-05 Mon 18:21

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