3 ms·

there is nothing to vacuum in diy systems. wall and outdoor units come pre-vacuumed and all the refrigerant is in lineset

• fomine3 4y ago
  I didn't know that pre-charged refrigerant lines is a thing. I wonder how they purge air.
  • tguvot 4y ago
    wall unit and outdoor unit come pre-vacuumed and sealed. lineset filled with gas and sealed. when you connect lineset to units seals are broken and gas fills entire system.