Quest DEH 3000R remote wall mounted digital control for Quest ventilating dehumidifiers. Features fan/filter operation and programmable ventilation timer. It has a large, easy-to-read, backlit LCD display. The DEH 3000R has high temperature cut-out, a dry cycle timer and auto reboot feature. Works with Quest Dual 105, 155, 185, 205, 225, 506 and 876. If you daisy chain the 506ppd units, we recommend only daisy chaining two units at a time. The 876ppd units require one unit per thermostat.