New proposals for EN 378 and 60335-2-40 Can use any means to minimise leaked amount of refrigerant, but sensors to detect leak and close valves can be used to prevent further release optional solenoid valve in suction line
not leaked
1000
leaked
R290 mass [g]
800 600unit indoor (e.g., evaporator) 400 200
solenoid valve in liquid line
0 sys on; check temp; shut valve
Retained mass
Released mass
sys off; shut valve
sys on; gas detector; shut valve
Whilst tests found approx. 10 – 20% charge retained in system under “off� mode, with shut-off valves, up to 80% charge can be retained