• Housing: Panels and frame made of painted galvanised thick steel to ensure total mechanical and weathering resistance. Panels are internally lined to reduce the noise level (LN and SL version only). • Compressor: SCREW SEMI-HERMETIC type, complete with motor thermal protection, Star-Delta starting, crankcase electrical heater and discharge intercepting valve. • Fan: Low speed, axial-flow fans fitted with accident-prevention protective grille; directly coupled motor with built-in thermal cutout and IP 54 protection degree; aerodynamic housing and wing profile blades increase efficiency and decrease noise level. • Air heat exchanger: Finned coil made with copper pipes and aluminium fins offering a high exchange surface area. • Water heat exchanger: Shell and tube type, thermally insulated by vapour-proof closed cell. • Electrical board: Switchboard to standards IEC 204-1/EN60204-1, complete with contactor and protection for compressor and fans, phases sequence relay. Main isolator and door interlock safety device. • Control: The microprocessor controls the unit capacity by timing the compressors and checks the operating alarms with the option of BMS and remote supervision. • Refrigerant circuit: Filter dryer, moisture-liquid sight glass, high and low pressure transducers, solenoid valve, thermostatic (electronic from size 2802) expansion valve with external equaliser.