Thermostat: Testing and Inspection

NOTE: The thermostat is numbered with the valve opening temperature.





1. Immerse the thermostat in water and gradually heat the water.
2. Check the valve opening temperature.
Valve opening temperature: 80° - 84° C (176° - 183° F)
If the valve opening temperature is not as specified, replace the thermostat.





3. Check the valve lift.
Valve lift: 10 mm (0.39 inch) or more at 95° C (203° F)
If the valve lift is not as specified, replace the thermostat.
4. Check that the valve is fully closed when the thermostat is at low temperatures (below 40° C (104° F)) If not closed, replace the thermostat.