Abstract: Methods and related systems for diagnosing a loss of capacity of a heating, ventilation, and air conditioning (HVAC) system are disclosed. In an embodiment, the method includes summing a runtime of an auxiliary heat source of the HVAC system over a plurality of time blocks. Additionally, the method includes summing an expected runtime of the auxiliary heat source over the plurality of time blocks. Further, the method includes comparing the runtime sum with the expected runtime sum, wherein the expected runtime for each of the plurality of time blocks is a function of an outdoor ambient temperature over a time-delay block beginning before the corresponding time block.

Abstract: Methods and related systems of detecting a temperature deviation in a heat exchanger coil of a climate control system. The method includes determining an enthalpy of the indoor space. The method includes detecting a coil temperature of the heat exchanger. The method includes detecting a coil temperature deviation based on the enthalpy and the detected coil temperature.

Abstract: Methods and related systems for controlling superheat in a climate control system are disclosed. In an embodiment, the method includes (a) determining a superheat of a refrigerant downstream of a coil of a heat exchanger of the climate control system. In addition, the method includes (b) determining that an expansion valve upstream of the heat exchanger is fully open. Further, the method includes (c) adjusting a speed of air flowing across the coil or a speed of a compressor of the climate control system after (b) based on the determination in (a) to control the superheat of the refrigerant.

Abstract: Methods and related systems of detecting a fault in a heating, ventilation, and air conditioning (HVAC) system are disclosed. In an embodiment, the method includes determining an expected runtime of the HVAC system required to achieve a temperature setpoint in a comfort zone of the HVAC system following a triggering event, wherein the expected runtime is based on a design temperature of a geographic location at which the HVAC system is installed. Additionally, the method includes monitoring a current runtime of the HVAC system elapsed following the triggering event, and comparing the expected runtime with the current runtime of the HVAC system elapsed following the triggering event.

Abstract: A HVAC system includes a cabinet configured as a duct, a coil assembly disposed within the cabinet, and at least one barrier configured to substantially segregate a low pressure zone associated with a downstream side of a heat exchanger of the coil assembly from a high pressure zone, wherein a leakage path is provided between the high pressure zone and the low pressure zone.

Abstract: A HVAC system includes a cabinet configured as a duct, a coil assembly disposed within the cabinet, and at least one barrier configured to substantially segregate a low pressure zone associated with a downstream side of a heat exchanger of the coil assembly from a high pressure zone, wherein a leakage path is provided between the high pressure zone and the low pressure zone.

Abstract: A HVAC system includes a cabinet configured as a duct, a coil assembly disposed within the cabinet, and at least one barrier configured to substantially segregate a low pressure zone associated with a downstream side of a heat exchanger of the coil assembly from a high pressure zone, wherein a leakage path is provided between the high pressure zone and the low pressure zone.