The current Title 24 modeling tools do not allow for cooling systems to be modeled that are 65,000 Btuh or greater. These are generally considered Large System, and have ratings that are in EER. If the system is in fact this large, you will need to model it as less…
Your HVAC system incorporate a Dedicated Outside Air System (DOAS) to provide the Outside Air ventilation for the Zone identified in this message. At the mechanical tab, you have not specified a valid Cooling Supply Air flowrate from the DOAS to provide the ventilation air. This CFM must fall between…
The VRF Indoor Unit you have entered in the Zonal Library does not have a Heating and/or Cooling capacity entered. The current simulation requires both and Heating and Cooling Capacity for VRF Indoor Units. Navigate to the Zone level of the Building Tree, in the Mechanical Tab, click on and…
When defining a Variable Refrigerant Flow (VRF) system, two components must be defined in the Building Tree. The Outdoor Condenser is defined at the System level of the tree, and each Indoor Evaporator unit is defined at the Zone level of the tree. Each Zone is required to have an…
When modeling conditioned spaces under Title 24, all spaces are required to be ventilated per the code. At the Zone level of the tree, in the Mechanical tab, you have set the source of ventilation as being provided by the HVAC system. The HVAC system is specified as having the…
You are modeling a VRF system in Version 6 or 7 (this FAQ does not apply to version 8), and since the VRF modeling is not approved by the CEC for Title 24 permit application, you cannot use the VRF system type in EnergyPro. For Title 24 permit submittals, you…
When modeling this type of system for Nonresidential buildings the approach will vary depending upon the type of Calculation. For the DOE-2 calculation (used in the 90.1 calculation, nonresidential performance calcs), you put in a dummy zone for the DOAS. This dummy zone can be conditioned zones in the building.…
Variable Refrigerant Flow (VRF) system modeling includes describing both the outdoor condenser unit of the system as well as the indoor evaporator units at each of the zones. Each manufacturer places restrictions on how much indoor unit capacity can be coupled to a particular outdoor unit. EnergyPro will check how…
The SS-Z documentation is reporting the VRF system performance only. This is how DOE-2 reports the outside operation and system performance of VRF systems. The PS-D reports the Total Plant Loads for the entire project as compared to the reporting of the VRF system only as found on the…
Note that this section applies to EnergyPro V8 or above, and non-Title 24 applications of VRF systems. For Title 24 applications, see this FAQ. The VRF models are located in the sample files, located in the example files section of this site. You will need to export the systems from…