Excess Temperature Thermocouple

Flynn Part Number: 173124

Wiring

White +, Red –

Setpoint

Typical 650°F

Code

NFPA 86 8.16

Description

Usually, J-Type, ½”NPT connection, aluminum head

Function

3.3.39.2 Excess Temperature Limit Interlock. A device designed to cut off the source of heat if the operating temperature exceeds a predetermined temperature set point.

Location

Either mounted in the exhaust stack or in the upper half of the baking chamber. Locations vary from oven to oven.

Description

The excess temperature interlock should be checked for operation on a regular basis and the temperature sensing element should be checked for calibration. The results should be recorded on at least an annual basis along with the active setpoint.

8.16* Excess Temperature Limit Interlock.

8.16.1 An excess temperature limit interlock shall be provided and interlocked into the burner management system, unless permitted by 8.16.2.

8.16.3 Operation of the excess temperature limit interlock shall cut off the heating system before the oven's maximum temperature, as specified by the oven manufacturer, is exceeded.

8.16.4 Operation of the excess temperature limit interlock shall require manual reset before restart of the furnace or affected furnace zone.

8.16.5 Open-circuit failure of the temperature-sensing components of the excess temperature limit interlock shall cause the same response as an excess temperature condition.

8.16.6* Excess temperature limit interlocks shall be equipped with temperature indication.

8.16.7* The temperature-sensing element of the excess temperature limit interlock shall be selected for the temperature and atmosphere to which they are exposed.

8.16.8* The temperature-sensing element of the excess temperature limit interlock shall be located where recommended by the oven manufacturer or designer.

8.16.9* The excess temperature limit interlock shall indicate its set point in temperature units that are consistent with the primary temperature-indicating controller.