Tech Tip #9 Control of Air Conditioners/Heat Pumps-Southeast/Southwest 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 be controlled. It should not run when the compressor is shed so that heat from the attic is not circulated into the home. Click on image for a close-up view Hook-up 1. Refer to the A/C schematic and locate the main power wire (usually R for red) from the thermostat. 2. Run a 2-conductor, 18-gauge wire from the load controller unit to interrupt the wire located 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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