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Contents Returning the WT-5300 ...................................................................................... 87 General Instructions ............................................................................................ 87 Repacking in Original Carton .............................................................................. 87 Repacking in a Different Carton .......................................................................... 89 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91 Warming System Specifications ......................................................................... 91 Transport and Shipping in Shipping Container ......................................... 92 Ground Integrity Test ................................................................................ 92 Earth Leakage Current Test ..................................................................... 92 Enclosure Leakage Current Test .............................................................. 92 Principles of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93 Control Panel ...................................................................................................... 93 Main Circuit Board ..............................................................................................94 DC Power Supply Circuit .......................................................................... 94 Control Logic Circuit ................................................................................. 95 Automatic Temperature Stepdown ........................................................... 95 Temperature Control Circuit ..................................................................... 96 LCD Hour Meter ....................................................................................... 96 AC Power Section ............................................................................................... 96 Blower ................................................................................................................. 97 Heater ................................................................................................................. 97 Thermostat Protection ........................................................................................ 97 Over-Temperature Test Port ............................................................................... 97 Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101 ii