The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 20, 2007
Filed:
Apr. 25, 2001
Shigeharu Taira, Kusatsu, JP;
Junichirou Tanaka, Kusatsu, JP;
Shigeharu Taira, Kusatsu, JP;
Junichirou Tanaka, Kusatsu, JP;
Daikin Industries, Ltd., Osaka, JP;
Abstract
A method for refrigerant and oil collecting operation capable of assuring the cleanliness of the inside of an existing communication pipe at a low cost and installing, at a low cost, a new air conditioner, comprising a compressor (), a heat source side heat exchanger (), a decompressing mechanism (), and a user side heat exchanger (), comprising the steps of performing a pipe heating operation in a heating operation mode and performing a refrigerant and oil collecting operation to collect refrigerant to a heat source side heat exchanger (), namely, with the refrigerant heated to a temperature higher than that where contaminants such as refrigerator oil inside a refrigerant circuit is dissolved into the refrigerant, performing the refrigerant and oil collecting operation so as to assure the cleanliness of the inside of the existing communication pipes ().