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Correspondence 08/19/99 THU 08:24 FAX 503 2525985 MARKMAN INC a002 MARKMAN INC. • • MECHANICAL CONTRACTOR • 9955 Southeast Ash Street • Portland. Oregon 97216 -2390 503- 255 -9923 • FAX 503 - 252 -5985 • CCB# 012857 City of Tigard August 19,-1999 13125.S.W. Hall Blvd. Tigard,. OR 97223 .. Attn: Robert - Poskin • Re:. Mechanical Plan. Review MEC # 99 -00326 PC # 7 -56c This is .in response to your comments regarding the mechanical for the proposed Medak Building. Item #1 We will install an autoEmatie.damper_ that. wilLbe interlocked_.wite unil.to shut down the outside _damper whenever the. ttnit- is-not running.. unnier . These units will not. have economizers_installed, .the. capacity of the 'units is. leis: than the requirement per code. Items # 2&5 Structural information is attached Item.# 3 Each unit is to serve a separate Tenant space and each unit is under the requirement to install smoke detectors. Item..# 4 We will permanently label each.. nit as-to the.area.it serves. Please -let me know if any additional information. is.needed. Sincerely, Markman, Inc. / i lames. E. Markman. • HEATING • AIR CONDITIONING • PLUMBING • SHEET METAL 40dll J & August 2, 1999 = I1i - - 4 CM' OF TIGARD Markman, Inc. OREGON 9955 SE Ash St Portland, OR 97216 RE: Medak Bldg. Mechanical Plan Review 11735 SW Queen Elizabeth PC #: 7-56c MEC #: 99 -00326 Submittal documents for the above referenced project have been reviewed for conformance with the applicable 1998 Oregon Specialty Codes and other applicable codes and standards. The following comments are noted: I MEC ANICAL I Where required by OSSC, Section 1202.2 natural ventilation or a mechanically ©� operated ventilation system capable of supplying occupancy air in accordance with OSSC, Table 12 -A shall be provided. When proposing to use the economizer of the HVAC system with the outside air damper set to stay partially opened to provide occupancy ventilation, the designer shall: A. Document within the construction plans the anticipated occupancy load for the design of the occupancy ventilation system and, B. Provide detail of the modification to the HVAC economizer that will prevent the building operator from adjusting the air damper to a fully closed position at any time and, C. Provide design specifications for the additional energy requirements resulting from the air damper being partially open during the heating cycle - and, D. Specify on the plans that the system shall operate during such times the building or space is occupied. 'n� i. Provide outside air specifications on revised plans. v T e attachment of permanent equipment (HVAC) supported by the building's ructural components shall be designed to resist the total design seismic forces prescribed in Section 1603.2 of the Structural Specialty Code. Provide an P fe-) engineer's design specifying attachment requirements [OSSC, Section 106.3.2 and OMSC, Section 304.4]. 3. Air moving systems (combination of units), supplying air in access of 2000 CFM to enclosed spaces, shall be equipped with an automatic shut -off. The smoke • 13125 SW Hall Blvd., Tigard, OR 97223 (503) 639 -4171 TDD (503) 684 -2772 P Medak Bldg. Mechanical Plan Review PC #: 7 -56c BUP#: 99 -00326 Page #2 detectors shall be supervised when a fire detection or alarm system is provided OMSC, Section 608]. o v[ Each individual roof- mounted HVAC shall be permanently labeled as to the areas it serves [OMSC, Section 305.5]. In addition, each unit shall be equipped with a power disconnect. A 120 -volt receptacle shall be located within 25' of each unit [OMSC, Section 309.1]. 0 5. Provide an engineer's analysis of each structural member supporting the additional HVAC units. The engineer shall submit plans, computations and specifications. Each plan and computation shall bear the original seal of the engineer licensed to practice as such. [OSSC, Section 106.3.2]. . Please submit two copies of revised submittal documents and a letter indicating your response to the above comments for review. Please call me at (503) 639 -4171 if you have any questions. Sincerely, • a",...)-- . bert Poskin, CBO SENIOR PLANS EXAMINER Y.lbldglprmsysmnec99326.doc • •