Replacing Thermostat

Thermostat can be tested and replaced as follows:

1. Take out cap screws and remove thermostat cover (A).

2. Remove thermostat (B) and all gasket material .

3. Visually inspect thermostat for corrosion or damage.

CAUTION: DO NOT allow thermostat or thermometer to rest against the side or bottom of container when heating water. Either may rupture if overheated.

4. Suspend thermostat and a thermometer in a container of water.

5. Stir the water as it heats. Observe opening action of thermostat and compare with specification given in chart below.

NOTE: Due to varying tolerances of different suppliers, initial opening and full open temperatures may vary slightly from specified temperatures.

6. Remove thermostat from container and observe its closing action as it cools. In ambient air the thermostat should close completely. Closing action should be smooth and slow.

Replace thermostat if it is defective.

7. Coat new gasket with sealant, and install.

8. Install new thermostat with the pin (C) on top for a proper filling.

9. Install cover, then tighten cap screws to 70 N·m (52 lb-ft).

A-Cover
B-Thermostat
C-Pin

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