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This is not necessary on systems utilizing a zone valve to control the BoilerMate® temperature. 4. After completing the boiler piping, slowly open the boiler fill valve and pressurize the BoilerMate® loop. Check for leaks and repair as necessary. Proceed to the appropriate wiring section in this manual. If installing on city water supply a properly sized THERM-X-TROL® is required with the BoilerMate® and should be installed as set forth in the THERM-X-TROL® product installation manual. HEAD ROOM