The RKK series .... serve as control modules with manual override function for the control of one to four dampers or other 2-point drives. There is a rotary switch for each drive with "Auto"-"Close"-"Open". There is an separate layer for the "Auto"-position, in order to indicate manual override to the DDC. In order to get this indication in the positions "Close" and "Open" you have to add "-H0" at the end of the type code (e.g. RPK2020-H0). To signal the status "Running", green LEDs are installed. The LEDs are driven with + 24V DC / AC. You can drive power contactors directly with potential free contacts (note contact load instructions). In switch position "Auto" the relays are controlled by the DDC / PLC + 24V DC / AC. If the DDC fails, you can control the system by means of switches. You can test the lamps with the RSM module connected via the 5-pole bus cable. RKK0010 - 1 damper RKK1010 - 2 dampers RKK1020 - 3 dampers RKK2020 - 4 dampers