Abstract: A limited modulation furnace and a method for controlling the limited modulation furnace using a floating control algorithm are disclosed. The method includes providing a furnace comprising a modulating furnace stage and at least one fixed heat output furnace stage, each fixed heat output furnace stage having an operational status of either on or off, passing a heating fluid through the furnace, measuring a temperature of the heating fluid exiting the furnace, determining an error based on a difference between the measured temperature and a set-point temperature, the set-point temperature being associated with a thermostat setting, determining whether the error is within a deadband range for the set-point temperature, and modifying at least one of the heat output of the modulating furnace stage or the operational status of at least one of the fixed heat output furnace stages in response to the error being outside the deadband range.

Abstract: A condenser arrangement for control of condenser temperature and condenser pressure. The condenser arrangement includes a condenser coil and a plurality of fans disposed adjacent to the condenser coil. The plurality of fans are arranged and disposed to circulate air through the condenser coil. At least one baffle is positioned between adjacent fans of the plurality of fans and forms a plurality of channels extending from a surface of the condenser coil. The channels include a variable flow channel having a plurality of adjacent fans of the plurality of fans. The condenser arrangement also includes a control system to control operation of the plurality of fans. The control system is configured to independently control each fan of the plurality of fans in response to a sensed condition.