3 ms·

You should use vacuum pump to avoid emitting GHG

• tguvot 4y ago
  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.