We have 108 heat pump PTAC\'s that meet the efficiency requirements of EA prerequisite 2 credit. Due to application requirements, we need to also have 2 vertical heat pump PTAC units. The 2 vertical heat pump PTAC units do not meet the efficiency requirements of EA prerequisite 2 credit. Efficiencies are below: 108 units at EER of 12.8, EA prerequisite 2 requires 11.3 2 units at EER of 9.6, EA prerequisite 2 requires 11.3 The 2 units that don\'t meet the efficiency requirement are similar in capacity to the other 108 units. These units need to be ducted however and they do not offer a ducted unit with the high efficiency option. These units were added to meet building code needs. With only 2 out of 110 total units not meeting efficiency requirements, the average efficiency of the 110 units (all similar in capacity) easily exceeds the minimum requirements. Is it okay to have these 2 units out of 110 total?
The project team has furnished further details explaining that in trying to meet building code requirements to provide heating and cooling to the corridors with outside air, and due to the peculiar configuration of the building, it was unable to use minimum efficiency ducted PTACs for 2% of the building\'s cooling capacity for two corridors of the building. It also states that ducted PTACs were not available in a higher efficiency option. Per LEED-CI Reference Guide, all equipment components must meet the mandatory, minimum efficiency requirements as listed in ASHRAE Standard 90.1-2004 Tables 6.8.1A-G. Utilizing the mean efficiency of all equipment in a system is not listed as an acceptable method of satisfying this requirement in ASHRAE Standard 90.1-2004. The PTACs (even those that are ducted) must be rated at the rating conditions specified in ARI 310/380 and 95