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:
Oct. 06, 2009
Filed:
Mar. 23, 2007
Shigeki Shimada, Nagoya, JP;
Masakazu Ando, Nagoy, JP;
Shigeki Shimada, Nagoya, JP;
Masakazu Ando, Nagoy, JP;
Rinnai Corporation, Nagoya-shi, JP;
Abstract
There is provided a circulation type hot water supply device in which a downstream end of a hot water delivering channelconnected to a heat exchangerof a water heateris connected to a water supply channelupstream of the heat exchanger, and a circulating pumpthat returns hot water fed from the heat exchanger to the hot water delivering channel to the heat exchanger through the water supply channel is provided in the hot water delivering channel. The device can reliably identify an abnormality when it occurs, such as adhesion of a deposit to an inner surface of a heat absorbing pipeto reduce heat exchange efficiency. A diagnosis is started when a hot water delivering tapis closed and a burneris subjected to combustion. In the diagnosis, supply of water to the heat exchangeris first stopped to shut down the burner. Then, the presence of an abnormality is determined when an amount of increase of a detection temperature from a hot water delivering temperature sensorreaches a predetermined threshold value or more.