Hot-water supply device

Abstract

Provided is a hot-water supply device which stabilizes hot-water supply even at low water pressure. A process performed by a hot-water supply device includes: a step (S510) of detecting that hot-water supply performed by the hot-water supply device is stopped; a step (S520) of reading a set temperature of the hot-water supply from a memory; a step (S530) of calculating a target opening degree of a total water amount servo based on the read set temperature; a step (S540) of sending, to the total water amount servo, a command for setting an opening degree of a passage through which water flows from the total water amount servo into a heat exchanger to the target opening degree; and a step (S550) in which a stepping motor of the total water amount servo moves in response to the command.

What is claimed is: 
     
         1 . A hot-water supply device, comprising:
 a heat exchanger;   a bypass flow path which is connected to a water entry path to the heat exchanger and a hot-water discharge path from the heat exchanger;   a bypass water amount adjustment portion which has an opening/closing portion and adjusts each amount of water flowing to the water entry path and the bypass flow path by adjusting an opening/closing degree of the opening/closing portion;   a hot-water supply water amount adjustment portion which adjusts an amount of water after merging between the hot-water discharge path and the bypass flow path;   a storage portion which stores a set temperature of hot-water supply; and   a control device which controls an action of the hot-water supply device, wherein   the control device adjusts, when the hot-water supply is stopped, an opening degree of the hot-water supply water amount adjustment portion according to an opening degree specified to be proportional to a change in the set temperature.   
     
     
         2 . A hot-water supply device, comprising:
 a heat exchanger;   a bypass flow path which is connected to a water entry path to the heat exchanger and a hot-water discharge path from the heat exchanger;   a bypass water amount adjustment portion which has an opening/closing portion and adjusts each amount of water flowing to the water entry path and the bypass flow path by adjusting an opening/closing degree of the opening/closing portion;   a hot-water supply water amount adjustment portion which adjusts an amount of water after merging between the hot-water discharge path and the bypass flow path; and   a control device which controls an action of the hot-water supply device, wherein   the control device adjusts, when the hot-water supply is stopped, an opening degree of the hot-water supply water amount adjustment portion according to a ratio of a flow amount to the bypass flow path relative to a flow amount to the water entry path.   
     
     
         3 . The hot-water supply device according to  claim 1 , wherein
 the hot-water supply water amount adjustment portion is a stepping motor, and   the adjustment of the opening degree comprises changing the number of steps of the stepping motor.   
     
     
         4 . The hot-water supply device according to  claim 2 , wherein
 the hot-water supply water amount adjustment portion is a stepping motor, and   the adjustment of the opening degree comprises changing the number of steps of the stepping motor.