Thermostat: Testing and Inspection

THERMOSTAT INSPECTION

NOTE: 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: 10.0 mm (0.394 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.