| 摘要 |
PURPOSE:To allow a fine adjustment of the activation point by pivotably connecting one end of a switch unit to a projection from the frame of a pressure detecting unit in a tank, and making the other end of the switch unit adjustable by means of adjustment screw. CONSTITUTION:A tank 19 has a heater 20, and also has a feed water pipe 18, a hot water discharge pipe 21 and a pressure detecting unit 23. The pressure detecting unit 23 consists of a pressure sensor 26 which has a shaft 29 slidable by the pressure coming from the feed water pipe 18, and a switch unit 27 having a switch 32 that converts the pressure to electrical signals. The switch 32 is attached to a projection 31a from the frame 31 of the pressure sensor 26 so that it may be pivotable with one end of the switch unit 27 as pivot. The other end of the switch is made adjustable by means of an adjusting screw 37 for adjustment of the activation point. |
