Abstract: An electric re-heat dehumidification apparatus to dehumidify a conditioned space is provided and includes a conditioning unit to produce an output airstream including overcooled air to be provided to the conditioned space to overcool the conditioned space during the dehumidifying of the conditioned space, a resistive element disposed within an output airstream of the conditioning unit, which, when activated, heats the overcooled air of the output airstream and a controller, operably coupled to the resistive element, to activate the resistive element in accordance with information of the conditioning unit, the resistive element and a temperature of the conditioned space to limit the overcooling of the conditioned space.

Abstract: HVAC systems and methods are shown which use volumetric air flow and static pressure calculations that correct for different air densities encountered at different altitudes. With respect to the volumetric airflow rate, the systems and methods disclosed herein adjust the calculation of airflow rate to better match the BTU content of de-rated natural gas used at higher elevations, and therefore they are usable in HVAC systems that combust natural gas. The adjusted static pressure calculations may be used in any type of HVAC system.

Abstract: An electric re-heat dehumidification apparatus to dehumidify a conditioned space is provided and includes a conditioning unit to produce an output airstream including overcooled air to be provided to the conditioned space to overcool the conditioned space during the dehumidifying of the conditioned space, a resistive element disposed within an output airstream of the conditioning unit, which, when activated, heats the overcooled air of the output airstream and a controller, operably coupled to the resistive element, to activate the resistive element in accordance with information of the conditioning unit, the resistive element and a temperature of the conditioned space to limit the overcooling of the conditioned space.

Abstract: HVAC systems and methods are shown which use volumetric air flow and static pressure calculations that correct for different air densities encountered at different altitudes. With respect to the volumetric airflow rate, the systems and methods disclosed herein adjust the calculation of airflow rate to better match the BTU content of de-rated natural gas used at higher elevations, and therefore they are usable in HVAC systems that combust natural gas. The adjusted static pressure calculations may be used in any type of HVAC system.

Abstract: A method to detect and respond to a coil condition in an HVAC system. The method includes calculating an initial airflow restriction value and a current airflow restriction value, which are compared. If the current airflow restriction value is greater than a first sum including the initial airflow restriction value and a first restriction factor, then a coil condition is preliminarily determined to be freezing and cooling in the HVAC system is stopped.

Abstract: An HVAC system includes a central controller which communicates with a multiple of HVAC components over a digital communication bus. The central controller maintains an ordered fault list that includes the source of a fault, a description of the fault, the last occurrence of the fault, and the number of sequential occurrences, or repetitions across the entire HVAC system.

Abstract: A method to detect and respond to a coil condition in an HVAC system. The method includes calculating an initial airflow restriction value and a current airflow restriction value, which are compared. If the current airflow restriction value is greater than a first sum including the initial airflow restriction value and a first restriction factor, then a coil condition is preliminarily determined to be freezing and cooling in the HVAC system is stopped.

Abstract: An HVAC system includes a portable controller unit which communicates with an indoor HVAC component and an outdoor HVAC component over a digital communication bus. A multiple of docking stations each in communication with the data bus are located at a multiple of locations throughout the system such that the portable controller unit may be selectively connected to any of the ports and moved therebetween. By moving the portable controller unit, the technician is then physically present at the HVAC component while exercising the system to obtain additional information and measurements directly from the HVAC component.

Abstract: An HVAC system includes a central controller which communicates with a multiple of HVAC components over a digital communication bus. The central controller maintains an ordered fault list that includes the source of a fault, a description of the fault, the last occurrence of the fault, and the number of sequential occurrences, or repetitions across the entire HVAC system.

Abstract: An HVAC system includes a portable controller unit which communicates with an indoor HVAC component and an outdoor HVAC component over a digital communication bus. A multiple of docking stations each in communication with the data bus are located at a multiple of locations throughout the system such that the portable controller unit may be selectively connected to any of the ports and moved therebetween. By moving the portable controller unit, the technician is then physically present at the HVAC component while exercising the system to obtain additional information and measurements directly from the HVAC component.