Air conditioning apparatus

A condensate disposal control means for a self-contained air conditioning unit for heating and cooling an enclosure comprising:

• a chassis including a base member and a barrier dividing said chassis into an indoor and outdoor compartment;
• a refrigerant circuit including an outdoor heat exchanger and indoor heat exchanger;
• a compressor;
• a reversing valve for selectively connecting said compressor to said heat exchangers whereby said outdoor heat exchanger functions as an evaporator during operation of said unit on the heating cycle and said indoor heat exchanger funtions as an evaporator during operation of said unit on the cooling cycle;
• indoor fan means for moving enclosure air through said indoor heat exchanger;
• outdoor fan means for moving outdoor ambient air through said outdoor heat exchanger;
• a condensate collecting sump in said base member arranged in said outdoor compartment;
• condensate disposal means arranged in said outer compartment including a condensate slinger motor operable in the heating cycle for lifting water when present in said sump and directing said water into the path of air being circulated by said indoor fan means where it is directed through and vaporized in the relatively warm indoor heat exchanger;
• a control system for operating said condensate disposal means including:
• (a) a thermostat means having a first stage switching means operable for energizing said compressor in said heating cycle when the temperature of said enclosure is a predetermined comfort level, and a second stage switching means operable for deenergizing said compressor when the temperature of said enclosure drops to a second lower pre-determined level during the operation of said compressor in said heating cycle;
• (b) a heating means arranged in the path of air through said indoor heat exchanger being energized by said second stage switching means when the temperature of said enclosure drops to the second lower preselected temperature;
• (c) a first control temperature sensing means for maintaining operation of said compressor in the heating cycle when said temperature sensed by said temperature sensing means is above a preselected frost accumulation level and for deenergizing said compressor when said temperature sensing means senses a preselected frost accumulation level to place said unit in a defrost mode;
• (d) a second control temperature sensing means for maintaining operation of said outdoor fan independent of said first control when the ambient sensed by said temperature sensing means is above a frost accumulation temperature and to complete a circuit to said fan through said first control if said temperature sensing means of said second control senses a preselected frosting temperature to deenergize said outdoor fan when said compressor is deenergized;
• (e) circuit means arranging said condensate slinger motor in series with said outdoor fan so that said slinger motor is operable only when said outdoor fan is energized;
• and
• (f) a temperature responsive sensing means being arranged in contact with said refrigerant circuit at a location that will sense when said outdoor heat exchanger is functioning as the system condenser to prevent operation of said slinger motor when said unit is in the cooling cycle.