US 11,674,695 B2
Hot water supply apparatus
Hideho Sakaguchi, Osaka (JP); Atsushi Okamoto, Osaka (JP); Masanori Ukibune, Osaka (JP); Yasuhiro Kouno, Osaka (JP); Yurika Gotou, Osaka (JP); Qi Fang, Osaka (JP); and Tim Coessens, Osaka (JP)
Assigned to DAIKIN INDUSTRIES, LTD., Osaka (JP)
Filed by DAIKIN INDUSTRIES, LTD., Osaka (JP)
Filed on Apr. 12, 2022, as Appl. No. 17/718,852.
Application 17/718,852 is a continuation of application No. PCT/JP2020/041062, filed on Nov. 2, 2020.
Claims priority of application No. JP2019-200695 (JP), filed on Nov. 5, 2019.
Prior Publication US 2022/0235945 A1, Jul. 28, 2022
Int. Cl. F24D 19/00 (2006.01); F24D 17/02 (2006.01); F24D 19/10 (2006.01); F24H 15/288 (2022.01); F24D 3/18 (2006.01)
CPC F24D 19/0092 (2013.01) [F24D 3/18 (2013.01); F24D 17/02 (2013.01); F24D 19/1054 (2013.01); F24H 15/288 (2022.01)] 20 Claims
OG exemplary drawing
 
1. A hot water supply apparatus, comprising:
a heat source device;
a tank configured to store water;
a water circuit through which the water in the tank circulates;
a heat exchanger having a first channel connected to the water circuit; and
a controller configured to control the heat source device and the water circuit, wherein
the controller is configured to perform:
a first operation in which the heat source device directly or indirectly heats the water in the first channel of the heat exchanger; and
a second operation in which the heat source device directly or indirectly cools the water in the first channel of the heat exchanger to a temperature which is lower than or equal to a temperature at which scale precipitates after the first operation ends, and
the controller is configured to perform a first determination of whether to perform the second operation according to an amount of scale in the water circuit in the course of the first operation.