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Where should the external equalizer line be installed
"hunting" between speeds
as long as your system is configured to read a standard 10k ohm Type II NTC thermistor curve
allowing for internal inspections without disturbing the permanent pipework
White-Rodgers 21V51U-843 HSI Kit 30067439-890 Where should the external equalizerThe White Rodgers 21V51U 843 is a professional grade Universal 2 Stage Integrated Furnace Control Kit designed for high efficiency systems utilizing a variable speed ECM blower motor. This comprehensive HSI ignition control solution replaces over 40 existing White Rodgers models, including the 50V51 XXX and 50V61 XXX series. It features a 16 pin interface for precise ECM motor control and includes a 120V nitride ignitor to upgrade older 80V silicon
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