METHOD FOR CHECKING REFRIGERANT CIRCULATION IN AIR-CONDITIONING SYSTEM

摘要

PROBLEM TO BE SOLVED: To protect a refrigerant heater and a compressor by checking to see if the circulation of a refrigerant is normal or not after starting a heating operation. SOLUTION: After the operation start signal of an outdoor machine 2 is received, refrigerant collection control of the inside of an outdoor heat exchanger 8 is made, a pipe temperature t1 at or near a refrigerant heater 28 is detected before the opening control of a two-way valve 24 that is provided at the refrigerant entrance of the refrigerant heater 28, further the two-way valve 24 is subjected to open control, and then the above pipe temperature t2 is detected. Also, it is judged that refrigerant circulation has failed in the case of t2 >=t1-a and is normal in the case of t2