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Control Boards
CONTROL DFRST 24 VAC 50/60 HZ IMPORT
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 8×8 LED matrix human interface to display status and fault codes for ease of set up and service.
CONTROL IGN SURF HOT HOT SURF IGN CTRL
The 50V51-843 is a two stage automatic gas interrupted ignition control employing a microprocessor to continually monitor, analyze, and control the proper operation of the gas burner and inducer. the 50V51-843 provides signals for proper operation of a variable fan speed circulator blower signals interpreted during continual surveillance of the two stage thermostat and flame sensing element initiate automatic ignition of the burner, sensing of the flame, and system shutoff during normal operation. the control incorporates system fault analysis for quick gas flow shutoff coupled with automatic ignition retry upon sensing a fault correction.