Resideo L4006A1009 High-Low Limit Aquastat Controller 100°F-240°F

The Resideo L4006A1009 High-Low Limit Aquastat Controller constantly monitors the temperature of water flowing in an HVAC system. By compensating for both maximum and minimum temperatures, the controller keeps the system operating within a tight range. When the system detects an increase in the water temperature above the high limit, the system automatically initiates a safety action or shutdown to prevent the system from overheating and causing destructive effects. Upon the temperatures falling below the low limit, immediately shutters on to reheat the system and maintain the desired temperature. With this dual high and low temperature protection, the controller ensures a safe and efficient running of the system without any condition that may damage it or its efficiency.