New thermostat - No coil control
you have to have a 2 heat 1 cool thermostat ( heat pump with backup heat) in order for everything to work properly. You purchased the wrong stat. The correct stat would have to have an emergency heat function. Heat pump should defrost fine as the HP controls the aux heat during defrost. During cold days/nights when the HP cant keep up, the system will not function properly and will never bring on aux (backup) heat.
IT IS WHAT IT IS
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Last edited by hvactech126; 02-13-2011 at 12:36 PM.