Liquid heaters and vaporizers – Stand boiler – Fluid fuel burner
Reexamination Certificate
2007-03-23
2009-10-06
Wilson, Gregory A (Department: 3749)
Liquid heaters and vaporizers
Stand boiler
Fluid fuel burner
C122S406100, C122S014220, C237S019000
Reexamination Certificate
active
07597066
ABSTRACT:
There is provided a circulation type hot water supply device in which a downstream end of a hot water delivering channel6connected to a heat exchanger4of a water heater1is connected to a water supply channel5upstream of the heat exchanger, and a circulating pump25that 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 pipe4bto reduce heat exchange efficiency. A diagnosis is started when a hot water delivering tap7is closed and a burner3is subjected to combustion. In the diagnosis, supply of water to the heat exchanger4is first stopped to shut down the burner3. Then, the presence of an abnormality is determined when an amount of increase of a detection temperature from a hot water delivering temperature sensor20reaches a predetermined threshold value or more.
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Ando Masakazu
Shimada Shigeki
Rankin , Hill & Clark LLP
Rinnai Corporation
Wilson Gregory A
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