| 摘要 |
PURPOSE:To make low-voltage control possible by a structure wherein relays equipped with contact in the hot water storage tank are shut-off from outside air with heat insulating material in order to prevent dew condensation. CONSTITUTION:Relays such as a temperature switch 3, a no-water relay 4 and the like are installed on the cover 5 of the upper opening of a water reservoir 6 and the heat insulating material 7 covers over the relays leak-tight in order to prevent the heat radiation. During water-feeding and heating, the space 8 between the cover 5 of the water reservoir 6 and the heat insulating material 7 is kept at high temperature state. Because the apparatus main bodies equipped with relay contacts installed in the space 8 are shut-off from outside air and kept at the same high temperature state as the space 8, the apparatus main bodies are prevented from dew condensation and moreover of their contacts is improved. As a result, the relays such as the temperature switch, the no-water relay and the like can be controlled in the hot water storage tank with the low voltage of 24V. |
