Tech Tip #8 Control of Air Conditioners Control the contactor for the compressor by breaking the low-voltage signal from the thermostat. Be sure to program a minimum OFF-TIME on the relay of at least 5 minutes to prevent short cycling of the compressor, and a minimum ON-TIME of 6 to 9 minutes for desired comfort level. In most cases, the fan should not be controlled - it should run when the compressor is shed. Click on image for a close-up view Hook-up 1. Refer to the A/C schematic and locate the wire from the thermostat that signals the compressor to operate (not the common return line). 2. Run a 2-conductor, 18-gauge wire from the control unit to the outdoor unit and interrupt the wire locaeted in Step 1 above. 3. Program a minimum OFF-TIME on the relay of at least 5 minutes to prevent short cycling of the compressor. Program a minimum ON-TIME of 6 to 9 minutes for desired comfort level. Return To Tech Support Go To Next Tech Tip

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