Abstract: The present invention is a charge balance device for a heat pump. The heat pump system has a heating and a cooling mode and includes an indoor heat exchanger, an outdoor heat exchanger, a compressor, refrigerant circuitry connecting the heat exchangers and the compressor in series arrangement, with the charge balance device connected in parallel arrangement with the outdoor heat exchanger. An accumulator is connected in line with the refrigerant circuit at a point immediately upstream of the suction side of the compressor for storing excess liquid refrigerant during heating mode. The charge balance device includes a check valve for blocking refrigerant flow, thus preventing the diversion of refrigerant flow around the outdoor heat exchanger during cooling mode, and a restrictor orifice for throttling refrigerant flow, thus regulating the flow of refrigerant diverted around the outdoor heat exchanger during heating mode.

Abstract: A refrigeration system includes an evaporator coil with a drain pan having alternative drain openings which receive movable primary and secondary drain plugs. A drain pan for use with horizontal A-coils is provided with alternative drain pan openings permitting a variety of configurations whereby the evaporator coil may be oriented in the space conditioning system in the most effective manner depending upon on-site conditions. A combination horizontal coil support and drainage duct with coil baffle provides a channel for effective communication of drainage fluid from the coil to the drain pan.