Thermostat: Testing and Inspection

THERMOSTAT INSPECTION
1. INSPECT THERMOSTAT





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





a. Immerse the thermostat in water and gradually heat the water.
b. 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.





c. 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.
d. 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.