The Intermatic FM1D20-AV-U SPDT Digital Timer is an electronic time-control module designed to automate HVAC and electrical equipment on 24-hour or 7-day schedules. It uses programmable setpoints to switch connected loads on and off automatically, with up to 20 programmed events, an LCD display, manual override, and battery backup. It is suitable for HVAC control circuits, ventilation... https://www.partshnc.com/fm1d20-av-u-intermatic-24hr7day-120v-spdt-20programs