| 摘要 |
An electronic two stage furnace controller may be used interchangeably, without modification thereof, with either a single or two stage thermostat t o regulate the heating and cooling operation of a two stage heating/cooling furnace to which the controller is connected. The controller is operative to monitor the input it receives from the thermostat, automatically deduce whether the input is from a single stage thermostat or a two stage thermostat, and responsively regulate the operatio n of the furnace under a corresponding single stage thermostat heating or cooling mod e, or a corresponding two stage thermostat heating or cooling mode.
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