The 47D01U-843 is the industry's first microprocessor-based universal replacement defrost controller intended for single stage heat pump systems. the control is configurable for both demand, and time/temp defrost routines. the 47D01U-843 replaces hundreds of controls while also offering many premium features beneficial to the contractor and homeowner. Improving energy efficiency by upgrading timed defrost units to demand defrost, and adding electric heat lockouts are just a few energy benefits. the 47D01U-843 is equipped with programmable short cycle delays, random start delay, 24V brownout protection, and reversing valve shift delays. the 47D01U-843 utilizes a unique 8x8 LED matrix human interface to display status and fault codes for ease of set up and service.