Recovery mode algorithm for two stage HVAC equipment

A controller configured to control operation of two stage HVAC equipment, the controller comprising non-transitory, computer-readable media having instructions stored thereon that, when executed by processing circuitry of the controller, are configured to cause the controller to:

• determine an elapsed time between a call for conditioning received by the controller and an ending of a recent cycle of the two stage HVAC equipment;
• compare the elapsed time to a threshold time period;
• in response to the elapsed time being below the threshold time period:
• determine a stage up time of the two stage HVAC equipment based on a first function;
• in response to the elapsed time meeting or exceeding the threshold time period:
• determine an average weighted percentage value based on a plurality of values, wherein each value of the plurality of values is associated with a corresponding previous cycle of a plurality of previous cycles of the two stage HVAC equipment;
• determine whether the average weighted percentage value falls within a subset of a first plurality of percentage value ranges;
• in response to the average weighted percentage value falling within the subset of the first plurality of percentage value ranges, determine the stage up time of the two stage HVAC equipment based on the first function;
• and
• in response to the average weighted percentage value falling outside the subset of the first plurality of percentage value ranges, determine the stage up time of the two stage HVAC equipment based on a second function;
• initiate first stage operation of the two stage HVAC equipment;
• and
• in response to lapse of the stage up time without the call for conditioning being satisfied, initiate second stage operation of the two stage HVAC equipment.

A multi-stage heating, ventilation, and air conditioning (HVAC) system, comprising:

• heat exchange tubes configured to receive a heat exchange fluid at a first flow rate corresponding to first stage operation of the multi-stage HVAC system and at a second flow rate corresponding to second stage operation of the multi-stage HVAC system, wherein the second flow rate is greater than the first flow rate;
• and
• processing circuitry configured to receive a call for conditioning and, in response to the call for conditioning, to:
• determine an elapsed time between the call for conditioning and an ending of a recent cycle of the multi-stage HVAC system;
• compare the elapsed time to a threshold time period;
• determine an average weighted percentage value based on a plurality of values, wherein each value of the plurality of values is associated with a corresponding previous cycle of a plurality of previous cycles of the multi-stage HVAC system;
• in response to the elapsed time being below the threshold time period:
• determine a first stage up time of the multi-stage HVAC system based on the average weighted percentage value and based on a first function corresponding to the elapsed time being below the threshold time period;
• in response to the elapsed time meeting or exceeding the threshold time period:
• determine a second stage up time of the multi-stage HVAC system based on the average weighted percentage value and based on a second function corresponding to the elapsed time meeting or exceeding the threshold time period;
• initiate the first stage operation of the multi-stage HVAC system;
• and
• in response to lapse of the first stage up time or the second stage up time without the call for conditioning being satisfied, initiate the second stage operation of the multi-stage HVAC system.