Universal Compatibility: Optimized for use with HCFC

brass flare fitting designed for high-pressure refrigeration and HVACR service

System Versatility: Approved for use in chillers

Built for non-reversing operation

The ACT0316 operates at a standard 50/60Hz frequency and is optimized for seamless integration with Trane and American Standard heating and cooling control boards

Lennox 15D57 Defrost Board R-410A Universal Compatibility: Optimized for useThe Lennox 15D57 Defrost Board is a high performance OEM defrost control kit specifically engineered for direct replacement in Lennox heat pump systems. As a veteran grade HVAC replacement part, this kit integrates a demand defrost control logic that actively monitors outdoor coil temperatures via the included 28W71 ambient sensor harness. This prevents excessive frost accumulation and optimizes system efficiency during low ambient operation. The