... is more convenient and high effective.3. Stage or non-stage energy control with high effective valve, ... the family electric appliances. ModelPC-280WSCD (Double Compressor)Rated Cooling Capacity50HZBtu/h3074990Kcal/h774463KW900.7USRT256.1Input Power ... Overheat Protection, Fusible Plug, Anti-freezing Temperature Controller, Compressor Heat Protector, Overcurrent Relay, Phase Sequence Protector, Lack ...