Entry Type ID Date Applicable Rating System Primary Credit Inquiry (LIs) Ruling (LIs) Related Addenda/LIs Related Resources Campus Applicable Internationally Applicable Country Applicability Reference Guide (Addenda) Page (Addenda) Location (Addenda) Description of Change (Addenda) "LEED Interpretation" "10127" "2011-11-01" "Existing Buildings, Schools - Existing Buildings, Retail - Existing Buildings" "EAp3 - Refrigerant management - ozone protection" "Page 218 of the LEED for Existing Buildings Reference Guide, v2009, states that all base building equipment containing greater than 0.5 lbs of refrigerant that is permanently installed must be documented for this credit. The term ""base building"" is a term of art in the real estate industry that is generally understood to exclude tenant owned equipment. For instance, lease language frequently defines base building responsibilities as items pertaining to the owner or management agent of the building, specifically excluding tenant responsibilities. \nBase building elements of a new construction build-out are generally defined to mean core and shell elements and would also exclude tenant furniture, fixtures and equipment (FF&E). Tenant owned HVAC equipment would be covered under FF&E. The LEED for Commercial Interiors and LEED for New Construction v2.2 Public Guides provide a definition:\n\n""Materials considered fit-out, furniture, and equipment (FF&E) are not considered base building elements""\n\nTenant owned refrigeration equipment, which often consists of small package refrigeration units installed for supplemental cooling in data rooms, are not core and shell elements, are not owned by the building owner and are typically not the maintenance responsibility of the owner or their agent. For this project, there are 3 base building chillers which serve the comfort cooling needs of occupants. Tenants own and maintain more than 100 small package HVAC units for supplemental cooling in data rooms and LAN closets within their suites. Individual tenants, not the building owner or manager, are responsible for the maintenance and refrigerant leakage tracking for these units. \n\nThe project team is aware of other LEED EB certified projects that have achieved EAc5 by excluding tenant-owned equipment by applying the definition from the NC Public Guide above. Clarification of this issue would be valuable for both individual projects and to ensure consistency across all LEED EB projects. \nWe ask for USGBC guidance on the following points:\n1. Define ""base-building"" equipment as it relates to EAp3 and EAc5\n2. Clarify if leakage rates must be established for all 100+ tenant-owned units within the project building, or if only the base building chillers must be analyzed to achieve EAc5\n3. If EAc5 is not being pursued, clarify if tenant owned HVAC units must comply with the requirements of EAp3 as the term ""central system"" is used on page 146 of the EBOM 2009 Ref. Guide and further confuses these issues. " "The requirements of EAp3: Fundamental Refrigerant Management and EAc5: Enhanced Refrigerant Management as they pertain to tenant-owned HVAC equipment for EB:O+M certification are as follows:\n1. As stated on page 146 and 218 of the LEED for Existing Building Operations and Maintenance Reference Guide, 2009, base building systems are those that contain 0.5 pounds of refrigerant or more. Small HVAC&R units, standard refrigerators, small water coolers, and any other cooling equipment that contains less than 0.5 pound of refrigerant are not considered part off the base building system and are exempt from this prerequisite; all other equipment must be included. Note that if it is not possible to gather the necessary tenant data for these credits, or the applicant does not have control over the required element, the project team can exempt up to 10% of the building\'s gross floor area. In other words, HVAC equipment serving such space would be exempt from the requirements of EAp3 and EAc5 if this exemption applies. \n2. Refrigerant leakage rates shall be calculated separately for each piece of equipment in the project building containing at least 0.5 pounds of refrigerant; therefore, this applies to all tenant-owned packaged HVAC units and building chillers included for compliance of EAp3 and EAc5. Note that the refrigerant leakage rate for each piece of equipment must be based on actual leakage rates experienced in the project building. If actual leakage rates have not been tracked, EAc5 cannot be earned. Please see page 221 of the LEED for Existing Building Operations and Maintenance Reference Guide, 2009 for information on calculating refrigerant leakage rates. Please also note that according to page 215 of the LEED for Existing Building Operations and Maintenance Reference Guide, 2009, the minimum refrigerant leakage rate allowable in credit calculations is 0.5%.\n3. Regardless of whether EAc5 is being pursued, all base building systems, those containing at least 0.5 pounds of refrigerant, shall be included for compliance of EAp3.\nApplicable internationally." "10392" "None" "X" "LEED Interpretation" "5330" "2008-10-24" "Existing Buildings" "EAp3 - Fundamental refrigerant management" "Cooling to the project building is provided by a district cooling system. The operator of the district cooling system (""Operator"") has five chilled water production facilities spread throughout its system with a total capacity of 36,000 tons. One of the five plants contains three 900-ton CFC-based chillers, only two of which can be run simultaneously due lack of cooling tower capacity. The three CFC chillers are the only chillers installed in this plant. Assuming two of the CFC-based chillers are running they are capable of providing 5% of the Operator\'s maximum chilled water production capacity. All five of the Operator\'s chilled water plants are physically interconnected to a common chilled water distribution system. The project building is located directly across the street from the Operator\'s main production facility which contains 54% of the Operator\'s total chilled water production capacity. The project building is one of 49 buildings connected to the district cooling provider\'s system. The peak cooling demand of the project building is 1200 tons. The peak demand for the Operator\'s entire system is 31,000 tons. Hydraulic modeling completed by the Operator shows that due to the project building\'s location on the district cooling system, chilled water produced by the CFC chillers cannot be delivered to the project building except under a single theoretical operating condition. The single operating condition in which chilled water from the CFC-based chillers could theoretically supply the project building would be if the Operator were operating no other chilled water production equipment other than two of the operable CFC chillers. The Operator has stated that since the minimum cooling load of their system exceeds the 1800-ton capacity of the plant containing the CFC chillers by a factor of two or more it would not be possible for the Operator to operate only the plant containing the CFC-based chillers. In order to meet minimum cooling loads additional chillers would have to be operated at one or more of the Operator\'s other production plants. Operating any number of additional chillers at one or more of the other production facilities will create the hydraulic conditions which prohibit chilled water produced by the CFC chillers from supplying the project building. The Operator believes this provides a quantifiable barrier to the project building being supplied chilled water from the CFC-based chillers that would be identical to what would be created by a physical barrier. We are requesting approval of the prerequisite based on the information presented which would be substantiated by submittal of Operator\'s hydraulic modeling results and model verification documentation. Documentation identifying an annual refrigerant leakage rate from the CFC-based chillers of less than 5% would also be submitted." "The above CIR has been submitted under EAc5: Refrigerant Management, but also seems to make reference to the associated perquisite, EAp3: Refrigerant Management - Ozone. The following guidelines explain the requirements for both the prerequisite and the credit. To meet the prerequisite, the district system must either be CFC free or a commitment to phasing out CFC-based refrigerants must be in place, with a firm timeline of five years from the projects performance period. Prior to phase out, reduce annual leakage of CFC-based refrigerants to 5% or less using EPA Clean Air Act, Title VI, Rule 608 procedures governing refrigerant management and reporting. Alternatively, the a third-party audit of the district system can be conducted to show that both conversion and replacement of CFC-using equipment is economically infeasible, as described in the LEED for Existing Buildings: Operations & Maintenance Reference Guide. For EAc4, credit calculations should be performed based on the equipment installed in the central chilled water system. If chilled-water from a specific plant in the system cannot be isolated and delivered to the project building, compliance with the above requirements must be demonstrated on a system-wide basis. Applicable Internationally. " "10392" "None" "X"