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Open the cold water supply valve to the boiler. b. Check for system leaks. c. Close the weighted check valve on the boiler return piping of the BOILER MATE™ d. Open the drain valve on the boiler return line to release entrapped system air. e. Close the drain valve f. Open the weighted check valve. C. ELECTRICAL WIRING All wiring must be in accordance with local codes, regulations, and ordinances or, in the absence of such codes, the National Electrical Code ANSI/NFPA No. 70, latest edition. The