COOLANT CHARGED AMOUNT DETERMINING METHOD AND COOLANT LEAKAGE DETECTING METHOD FOR MULTIPLE TYPE AIR CONDITIONING SYSTEM

摘要

PPROBLEM TO BE SOLVED: To provide a coolant charged amount determining method and a coolant leakage detecting method for a multiple type air conditioning system providing charging of coolant of a proper amount matching respective multiple type air conditioning systems by accurately judging a gas low and/or overcharging of a coolant charged amount. PSOLUTION: The coolant charged amount determining method is for the multiple type air conditioning system 1 composed of an outdoor unit 2, and a plurality of indoor units 7A, 7B connected in parallel with each other to the outdoor unit 2. A four-way selector valve 23 is switched to a cooling cycle, a low pressure and a high pressure in the cycle are fixed, a coolant overheating degree of an indoor heat exchanger 71 outlet is fixed to carry out cooling operation in all of the indoor units 7A, 7B, and when an opening of an indoor expansion valve 71 and/or a supercooling expansion valve 28 is a predetermined value or more in this state, it is determined that the coolant charged amount is a gas low state. PCOPYRIGHT: (C)2008,JPO&INPIT