Thermostat: Testing and Inspection

1. Visually check that the thermostat valve is airtight.
2. Place the thermostat and a thermometer in water.
3. Heat the water and check the following.

Opening Temperature
Initial-opening temperature:
80 - 84° (176 - 183° F)
Full-open temperature:
95° C (203° F)

Full-open lift:
8.5 mm (0.33 inch) minimum