The unit uses original Copeland compressors as well as domestic and foreign well-known brand solenoid valves, pressure control, dry filters, sight glass and other major accessories (according to the user's customization, and uses DC fans with Continuously variable fan control board which is our independent intellectual property rights .Thermoelectric Refrigeration Unit This Compressor Unit Parts model of unit is designed for a suitable condensing area and combined with corresponding overheating protectors to ensure normal operation of the unit at various temperatures.Copeland Scroll Compressor Condensing Unit.