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The Y88FB Series Twinning Control provides operation of two parallel furnaces, in a common duct system, from a single thermostat, including cooling and manual fan functions. The Y88FB controls supports both single and dual stage heating/cooling thermostats. Fan sensors continuously monitor the fan motors for proper systems operation. The system shuts down if either fan fails to operate.The Y88FB is compatible with programmable/setback thermostats with a bypass current of 25 milliamperes or less. Diagnostic Light-Emitting Diode(LED) signals from an integrated furnace control may also be sensed and displayed by the Y88FB.
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