Hot water heating device
AssigneeFujitsu General Limited
InventorsKazuki SUDA, Hirofumi HIRANO, Daiki SHIMANO, Tomoyuki FUNAKI
Life of this patent
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Abstract
It is configured such that, when at least one of water temperatures (Twi) of first to third indoor terminal units (4i (i=a to c) ) where operation stops is equal to or less than a predetermined water temperature (Tw2) or when room temperatures (Tki) of first to third rooms (3i) are equal to or less than a predetermined room temperature (Tks) at the time when an outdoor air temperature (To) has become equal to or less than a predetermined temperature (Tos), an indoor opening/closing valve (12i) of the relevant indoor terminal unit (4i) performs opening operation.
Claims12
A hot water heating device comprising:
- a water circulation circuit where a heat source unit configured to heat water, a pump, a plurality of indoor terminal units and a plurality of opening/closing valves connected in parallel to the heat source unit are connected by a pipe and where water circulates between the plurality of indoor terminal units and the heat source unit;
- an outdoor air temperature detection device configured to detect an outdoor air temperature;
- a plurality of terminal unit water temperature detection device configured to detect a terminal unit water temperature, the terminal unit water temperature being a temperature of water that has passed through each of the plurality of indoor terminal units;
- a plurality of room temperature detection device configured to detect a room temperature of a room where each of the plurality of indoor terminal units is installed;
- and
- a freeze prevention control device configured to perform freeze prevention control by opening the opening/closing valve corresponding to the indoor terminal unit where operation stops by closing the corresponding opening/closing valve to make water flow to the indoor terminal unit;
- wherein
- the freeze prevention control device is configured such that, when the outdoor air temperature is equal to or less than a predetermined temperature, the freeze prevention control device performs the freeze prevention control to the opening/closing valve corresponding to the indoor terminal unit satisfying at least one of states in which the terminal unit water temperature of water that has passed through the indoor terminal unit is equal to or less than a first water temperature and in which the room temperature of the room where the indoor terminal unit is installed is equal to or less than a predetermined temperature among the indoor terminal units where the operation stops.
Dependencies are inferred from the claim text.