| 摘要 |
PROBLEM TO BE SOLVED: To perform the airtight test of a hot water circulation passage between a terminal apparatus and a heat source machine when connection therebetween is effected. SOLUTION: When the hot water flow pipe of a terminal apparatus is connected to the hot water passage of a heat source machine to form a hot water passage, an automatic test operation switch 72 and a manual water filling switch 73 are operated to output a command to execute an airtight test. In which case, a hot water pouring solenoid valve 15a to supply city water to the hot water circulation passage is repeatedly opened and closed. City water is gradually supplied to the hot water circulation passage, and the internal part of the hot water circulation passage is gradually pressurized to a set test pressure for an airtight test. |
