leak testing

[Brian_UK]

Well...

Following Mitsu or Daikin Intallation manuals we need to keep pressure for 24h on comissioning...
in 2-3h some engineers could find that pressure drops or raises and depends up to air/ sun temperature.
True leak test is VAC test... Left pomp through the night and in the morning take VAC for 2-3h... if holds 4-6 Torr, then OK... If more.... use sealant, if more then 10, then put CO2 + Refrigerant or OFN + HE... or if system compicated, use distilated water...

P.S.: DIN standard is in base of EN and is more demanding. Belive me /have Tuv nord certificate for pressure test./

I intrigued to know how a pressure test of 1 bar can prove that a system is leak free.

Also what sealant do you use ?