Trial
Connect the (+) power supply to terminal ±3, ground terminal ±2, and connect a test light between terminals ±1 and ±3.
Note: Use a 12V, 3-18W bulb. Submerge the A/C thermostat in a glass of ice water and check the test light.
The light should go out at 2-4°C or lower and should come on at 4-5°C or higher. If the light does not behave as specified, replace the A/C thermostat.
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