Icp Heil-Quaker 1086579 Sensor Defrost Demand

The Icp Heil-Quaker 1086579 Sensor Defrost Demand is a temperature-sensing component used to determine when frost accumulation on an outdoor heat-pump coil requires a defrost cycle. As coil temperature falls to conditions associated with frost formation to provides a signal to the defrost control, which initiates the appropriate cycle and temporarily redirects warmer refrigerant through the outdoor coil. Mounted at the designated outdoor coil sensing point in HVAC systems to monitor coil temperature directly for demand-based defrost control. This arrangement limits unnecessary defrost cycles and preserves the intended heating sequence of compatible heat-pump units.