The Ranco E15-256 is a professional-grade heat pump de-ice control designed for precise defrost cycle initiation and termination in residential and commercial split systems. This SPDT (Single Pole Double Throw) controller operates on a 24V circuit and features a 54-inch capillary with a laser-welded stainless steel sensing element for high-accuracy temperature detection. Engineered to eliminate frost accumulation on outdoor coils, it utilizes a timer-initiated mechanism with integrated temperature-permissive logic. The internal interlock prevents redundant cycling by requiring coil temperatures to drop to 28°F or lower before activation. Technicians can field-select timing intervals of 30, 45, or 90 minutes, allowing for flexible optimization based on local environmental conditions and equipment specifications. With an adjustable temperature range of 55°F to 78°F and a fixed 7°F differential, the E15-256 ensures reliable switching performance and protects compressor longevity by maintaining optimal thermal transfer efficiency across the heat pump coil. Key Benefits Field-Selectable Timing: Allows contractors to set defrost intervals at 30, 45, or 90 minutes to match specific climate demands. Robust Sensing: The 54-inch capillary and stainless steel bulb provide durable, cross-ambient temperature sensing for consistent defrost control. System Protection: Integrated interlocked logic prevents multiple defrost cycles within a single time period, reducing unnecessary mechanical wear. Wide Compatibility: Designed as a heavy-duty replacement for many Ranco E15 series and competitor heat pump controls. Common Questions What temperature is required to initiate the defrost cycle? The control requires the sensing bulb to detect a temperature of 28°F or lower at the designated initiation point to allow the timer to start a cycle. Can the defrost termination temperature be adjusted? Yes, the Ranco E15-256 features an adjustable temperature range from 55°F to 78°F for precision termination. Does this unit support 240V applications? No, this specific model is rated for 24V low-voltage control circuits. Verify your system's transformer output before installation. Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
