Hot-water supply apparatus, anti-freezing method thereof, and anti-freezing program thereof

A hot-water supply apparatus having a primary heat exchanger, which absorbs sensible heat of combustion exhaust generated by combustion of fuel, and a secondary heat exchanger which absorbs latent heat of said combustion exhaust, comprising:

• a first temperature detection means that detects a temperature of a water pipe of an entrance water side;
• a second temperature detection means that detects a temperature of a water pipe of an outgoing hot-water side;
• a combustion means that supplies said combustion exhaust to said primary heat exchanger and said secondary heat exchanger;
• an air supply means that supplies air to said combustion means;
• and
• a control means that makes said combustion means burn and drives said air supply means based on a detected temperature of said first temperature detection means or said second temperature detection means;
• a freezing prevention temperature that forms reference of a start of freezing prevention operation being set for the control means, and, in case where either a detected temperature of said first temperature detection means or a detected temperature of said second temperature detection means reaches said freezing prevention temperature, or in case where both of them reach said freezing prevention temperature, said control means making said combustion means burn for a settled time to heat said primary heat exchanger, and driving said air supply means to stream air from a side of said primary heat exchanger to said secondary heat exchanger for a given time after a combustion stop of said combustion means.

An anti-freezing method of a hot-water supply apparatus having a primary heat exchanger, which absorbs sensible heat of combustion exhaust generated by combustion of fuel, and a secondary heat exchanger which absorbs latent heat of said combustion exhaust, comprising:

• processing that sets a freezing prevention temperature which forms reference of a start of freezing prevention operation;
• processing that detects a temperature of an inside of said hot-water supply apparatus;
• processing that supplies combustion exhaust, which is generated at a combustion means by combustion of fuel, to said primary heat exchanger and said secondary heat exchanger;
• processing that supplies air necessary for combustion to said combustion means by an air supply means;
• and
• processing that makes said combustion means burn for a settled time to heat said primary heat exchanger in case where said freezing prevention temperature is detected, and drives said air supply means to stream air from a side of said primary heat exchanger to said secondary heat exchanger for a given time after a combustion stop of said combustion means.

An anti-freezing method of a hot-water supply apparatus having a primary heat exchanger, which absorbs sensible heat of combustion exhaust generated by combustion of fuel, and a secondary heat exchanger which absorbs latent heat of said combustion exhaust, comprising:

• processing that sets a freezing prevention temperature which forms reference of a start of freezing prevention operation;
• processing that detects a first temperature of a water pipe of an entrance water side;
• processing that detects a second temperature of a water pipe of an outgoing hot-water side;
• processing that supplies combustion exhaust, which is generated at a combustion means by combustion of fuel, to said primary heat exchanger and said secondary heat exchanger;
• processing that supplies air necessary for combustion to said combustion means by an air supply means;
• and
• processing that makes said combustion means burn for a settled time to heat said primary heat exchanger in case where either said first temperature or said second temperature reaches said freezing prevention temperature, or in case where both of them reach said freezing prevention temperature, and drives said air supply means to stream air from a side of said primary heat exchanger to said secondary heat exchanger for a given time after a combustion stop of said combustion means.

An anti-freezing program on a computer readable medium of a hot-water supply apparatus having a primary heat exchanger, which absorbs sensible heat of combustion exhaust generated by combustion of fuel, and a secondary heat exchanger which absorbs latent heat of said combustion exhaust, and making a computer execute the following steps, comprising:

• a step that obtains a temperature data of an inside of said hot-water supply apparatus, which is detected by a temperature detection means;
• a step that makes a comparison between a temperature of the inside of said hot-water supply apparatus and a freezing prevention temperature which forms reference of a start of freezing prevention operation;
• a step that drives a combustion means for a settled time for the purpose of heating said primary heat exchanger in case where said temperature of the inside of the hot-water supply apparatus reaches said freezing prevention temperature;
• and
• a step that drives an air supply means for a given time after a stop of drive of said combustion means for the purpose of streaming air from a side of said primary heat exchanger to said secondary heat exchanger.

An anti-freezing program on a computer readable medium of a hot-water supply apparatus having a primary heat exchanger, which absorbs sensible heat of combustion exhaust generated by combustion of fuel, and a secondary heat exchanger which absorbs latent heat of said combustion exhaust, and making a computer execute the following steps, comprising:

• a step that obtains a first temperature data of a water pipe of an entrance water side;
• a step that obtains a second temperature data of a water pipe of an outgoing hot-water side;
• a step that makes a comparison between said first and second temperatures and a freezing prevention temperature which forms reference of a start of freezing prevention operation;
• a step that drives a combustion means for a settled time for the purpose of heating said primary heat exchanger in case where either said first temperature or said second temperature reaches said freezing prevention temperature, or in case where both of them reach said freezing prevention temperature;
• and
• a step that drives an air supply means for the purpose of streaming air from a side of said primary heat exchanger to said secondary heat exchanger for a given time after a stop of drive of said combustion means.