Section 8 AAC 80.080 - Pressure or temperature controls(a) An automatically fired steam boiler must be protected by (1) a high-limit safety control, set to prevent the pressure from exceeding the maximum allowable working pressure of the boiler; and(2) an operating control designed to cut off the fuel supply if the pressure reaches an operating limit; the operating limit must be less than the maximum allowable working pressure of the boiler.(b) An automatically fired hot water heating or hot water supply boiler must be protected by (1) a high-limit safety control that is set to prevent the temperature from exceeding the marked maximum water temperature at the boiler outlet; and(2) an operating control designed to cut off the fuel supply when the temperature reaches an operating limit; the operating limit must be less than the maximum water temperature of the boiler.Eff. 6/21/84, Register 90; am 12/17/99, Register 152