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NC-2009 EAc3:Enhanced Commissioning

ASHRAE/IECC Compliance for AHU's, RTU's and Heat Pumps

Hello Design Review Experts, During a design review for a residential high rise, we noted that several areas of common space did not seem to have the capacity to use an economizer, Demand Control Ventilation (DCV) or night set-back. I believe that ASHRAE and the IECC have pushed for these modes in most common space applications though I am not exactly sure whether they are in compliance. Due to financial constraints the design switched from the typical VAV air-handling unit system to using 8 heat pumps which is why so many common modes of operation have been deleted. Here were the explanations I received from the EOR: 1. Since the whole building is classified as residential, common areas such as a leasing office, basketball court, gym, computer room (etc...) would also fall under residential. Therefore they do not need to have an economizer or DCV. 2. If not classified as residential, what modes of operation would be 'required' by ASHRAE or IECC for the leasing office. (and other common areas) 3. Many areas are planned to be 24/7, so therefore, they do not need to comply with night setbacks. 4. Is there a difference in mode requirements for a large AHU vs. smaller HPs? Or is the type of equipment irrelevant with only the space type and occupancy being relevent. 5. These Heat Pumps will have programmable stats... However, they will be locked behind plastic so that residents cannot change temperatures... Does this really count as a programmable stat satisfying 'controllability of systems - thermal comfort' Thanks to anyone who wants to comment on this. Does anyone know of a good ASHRAE IECC forum to post this on as well? Pete

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Fri, 06/07/2013 - 14:21

Peter, I will try to give a little insight to your questions. First, you bring up something that we all have to deal with, and that is the EOR response. As we bring up questions or concerns in a design review, the burden of resolution falls on the EOR. They will be signing the project, and will be submitting to GBCI for certification as well, so many of the issues you state below will be resolved below. Once we get an EOR response that states they have considered this or their interpretation is such, then we tend to back off. We may agree to disagree, and have in several instances, but it is not our role to force our opinions on a project. Now, we may very well be proved right during functional testing too. By accepting the EOR response and closing an item does NOT mean we agree or approve something, only that they have spoken, and the owner has accepted that decision. I will let others comment on the energy aspects (which you might post questions 1 thru 4 under EAp2 or EAc1, as this goes to 90.1 compliance). Your item 5 has come up on another project, and you are correct. If the occupants cannot change the setpoint, then they do not have controllability. On a recent project we were commissioning, the guards were on the thermostats, but were not part of the contract. The owner was moving in while construction was finishing, and went and installed the guards themselves…the maintenance staff did without talking to the project management staff. We noted this on the Action Log as not conforming to the contract documents AND that the point was in jeopardy. The guards were removed. The decision was placed with the owner on if they wanted the guards or the point.

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