I have a Tenant Improvement that has VAV terminal units connected to an existing VAV AHU. The contractor and owner decided to save money and utilize stand alone control. Though the problem with their solution is that the thermostats only have ON-OFF function and cannot modulate between dead band and full cooling (since the project does not have re-heat). I have looked and cannot find much, aside from ASHRAE 90.1-2007 Addendum h, that states that a VAV TU has to modulate. I do not think I am wrong in assuming this control logic, since the opposite is both uncomfortable for occupants and a waste of energy for the tenant.
Thanks
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Tristan Roberts
RepresentativeVermont House of Representatives
LEEDuser Expert
11478 thumbs up
November 3, 2013 - 9:13 pm
Jorge, I am no expert on the systems you're describing but your logic sounds reasonable.
Scott Bowman
LEED FellowIntegrated Design + Energy Advisors, LLC
LEEDuser Expert
519 thumbs up
November 7, 2013 - 1:56 pm
I would have to agree, to spend the money required for the VAV terminal, then turn it into an on/off device is terrible! There would also be an issue with ventilation and compliance with ASHRAE 62.1 as well, since ventilation would be shut off if the terminal is closed.