The slave damper control relay, model SDCR, is a relay control panel used when three or more dampers need to be controlled by a single switch or thermostat. The SDCR can control up to four dampers. Each motor is controlled individually by a separate set of contacts in the plug-in relay. The SDCR can be wired to open and close all damper motors simultaneously. By reversing the M4 and M6 wires on any motor, these dampers can be made to operate in reverse of the other dampers, such as in a face and by-pass operation.

• Specification Sheet https://www.plumbers-supply-co.com//ASSETS/DOCUMENTS/ITEMS/EN/UNI-PS26421_Spec.pdf