Hot water heating system

Abstract

A hot water heating system is provided with: a hot water heating device; a heating terminal; a heat circulation circuit; a circulation means; and an expansion-absorbing means. The hot water heating device is provided with: a heating passage; a heating means for heating a heat medium inside the heating passage; a pressure detection means; a supply passage connected to the heating passage; an opening/closing means for the supply passage; and a control means which opens the opening/closing means to supply the heat medium when the internal pressure of the heating passage is less than a reference value. The control means determines that the positional relationship between the circulation means and the expansion-absorbing means is inappropriate when the pressure detected by the pressure detection means at the moment the circulation means starts to be driven is lower than the pressure detected prior to driving the circulation means.

What is claimed is: 
     
         1 . A hot water heating system, comprising a hot water heating device, a heating terminal, a heat circulation circuit connecting the hot water heating device and the heating terminal, a circulation means provided in the heat circulation circuit, and an expansion-absorbing means provided in the heat circulation circuit to absorb a volumetric expansion of a heat medium due to an increase in temperature,
 wherein the hot water heating device comprises a heating passage connected to the heat circulation circuit, a heating means which heats the heat medium in the heating passage, a pressure detection means which detects an internal pressure of the heating passage, a supply passage connected to the heating passage, an opening/closing means for opening and closing the supply passage, and a control means which opens the opening/closing means to supply the heat medium when the pressure detection means detects that the internal pressure of the heating passage is less than a preset reference value, and   the control means determines that a positional relationship between the circulation means and the expansion-absorbing means is inappropriate in a case where a detection pressure of the pressure detection means at the time driving of the circulation means starts is lower than a detection pressure before the driving of the circulation means.   
     
     
         2 . The hot water heating system according to  claim 1 , wherein the hot water heating device comprises a bypass passage which branches off from the heating passage downstream of the heating means and connects to the heating passage upstream of the heating means so as to bypass the heat circulation circuit, and
 the bypass passage comprises a heat exchanger for performing heat exchange between the heat medium and a hot water supply.   
     
     
         3 . The hot water heating system according to  claim 2 , further comprising a distribution valve capable of adjusting a distribution ratio of the heat medium at a branching part of the heating passage and the bypass passage.