• Use with AQ1000 two-wire communicating thermostats, or most dry contact digital thermostats
• Offers zoning control for up to four zones and controls up to two stages of heat from a single thermostat
• Can expand up to 16 zones with Aq255 or Aq257 or up to 64 zones with Aq254 add-a-temp panels
• Line or low-voltage output for zoning equipment, including pumps or valves
• Features zone synchronization through the zone or greatest demand control