CLASSIC cylinder filling "forming gas"

200 bar, consisting of 95 % nitrogen (N2) + 5 % hydrogen (H2)
Filling a leaking air conditioning system with refrigerant / coolant, even for the purpose of leak detection, is not permitted. The leak must first be repaired before the system is filled with refrigerant / coolant (§3 Para. 3). In practice, this means that a refrigeration or air conditioning system that is depressurized (without refrigerant) must bead breaker before filling with e.g. nitrogen or forming gas.
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