| 摘要 |
PROBLEM TO BE SOLVED: To give warning of miswiring when a signal wire from another control unit for controlling a hot-water terminal unit is connected to an extra input terminal in case such an extra input terminal is present in a connection between the input terminals and output terminals as a result of the setting of a changeover switch. SOLUTION: A hot-water heating system is provided with a plurality of input terminals N1-N5 for inputting control signals from a control unit, a plurality of output terminals D1-D5 which are connected to the input terminals one by one or in a one-to-plurality relation, on-off valves B1-B5 for controlling the amount of hot water supplied to the hot-water terminal unit, which are connected to the individual output terminals, respectively, and a changeover means 12 for setting connection between the input terminals and the output terminals. In the case where the changeover means 12 switches the connection to the one-to-plurality relation, and where the signal wire from another control unit for controlling the hot-water terminal is connected to an extra input terminal in the connection, display means L1-L5, 14 display that the connection is miswiring.
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