Not required., SL-DI Electric heater., SL-DC Hot water coil., SL-DFR Reversible water coil (hot/cold water)., SL-DF Cold water coil., SL-DX Direct expansion coil., IJK - Manual motorisable dampers., IAE - Rectangular flexible connection., LF 230 S - On-off actuator with spring return., Three way valve with proportional actuator., AIRSENS CO2., TDP-S - Presure sensor., SCO2-G 0/10V - CO2 sensor.