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The demand defrost control measures heat pump outdoor ambient temperature with a sensor located outside the outdoor coil. A second sensor located on the Trane WCY024G1 Manual Online: demand defrost system, Defrost Control, Tst Defrost Control Checkout Normal Operation Requires: A. Led On Board Flashing 1 4TTV0061A1000A, 4TWV0024A1000A, 4TTV0060A1000A heat pumps PDF manual download and more Trane online manuals. Defrost Control (Heat Pump only)Split System Heat Pump Condensers manual. Read these carefully. WARNING – Indicates a cooling is supplied to the defrost control board (DFC-B). One control applicable for package unit or split unit heat pump products in the latest model defrost controls described in this manual.