Systems Solution Consultant, LLC July 23, 2013 To Mr. Mike Blanek SVA Ref: O R Humidity Control We received the memo from the mechanical contractor regarding the recent work they performed on O R Unit to achieve the humidity level in space. We also received an email from Mr. Eric Brouillard, stating that the space is still not achieving the humidity level as required. Assuming the O R Unit is now being retrofitted with dehumidification control, we can make an educated guess of two potential reason for not achieving the desired humidity level and they are as follows: 1 2 The capacity of the unit is not adequate to remove all the moisture that needs to be removed The O R Area being open to the recovery area, the unit that is serving the recovery also require to have dehumidification control. Pursuant to our review of our construction document, that includes original design document, permit drawings as well as revised drawings based on contractors suggested changes and their marked up drawings, we would like to make the following comments based on design criteria per contract drawing: 1 2 The total cooling load to achieve the humidity level per Michigan Health Care Facilities Design Standard is approximately 448 MBH (37 % Latent Load). The final equipment schedule shows the load required. The unit should be equipped with dehumidification control with hot gas bypass for reheat. The unit that serves adjacent recovery area is also required to have the dehumidification and hot gas bypass for reheat. If the installed units meets the above requirement we believe the space will comply with the requirement of Michigan Health Care Facilities Design Standard Please see attached, the following 1 2 3 4 Schedule sheet per Permit Drawings dated 3-30 2012 Schedule sheet per Bulletin 4 (dated 9-28-12) reflecting changes made per contractor’s mark-up drawings. Michigan Health Care Facilities Design Standard for Humidity and temperature requirement. Shop drawing comments for RTU and Control system. Thank you Diptarka Gangulee, PE Systems solution 1001 Woodward Detroit 48226 Ph/Fax (313)221 9933 Ph/Fax (734)213 3387 1001 Woodward Ave. Suite #920, Detroit, MI 48226 2900 S. State St., Suite @1, Ann Arbor, MI 48104