Correspondence •
1n st ry CoM
June 25, 1998
City Of Tigard
13125 SW Hall Blvd
Tigard Oregon 97223
Attn: Robert Poskin
Re: Thayer Co. Mechanical Plan Review
73 y2, SW Kable Lane
PC #: 04 -107c MEC #: 98 -0141
Dear Robert,
The following information is provide in response to your Mechanical Plan Review letter
dated May 20, 1998:
1. Attached plans are the structural plans for this installation as provided by TM Rippey
(Brent 244 -0266)
2. Exhaust system for the restrooms is connected to the lighting system. No make -up air
units to be installed on this project.
3. New units are split system heat pumps. Outside air is provided to these units to meet
fresh air requirements for occupancy.
4. Each unit shall be properly marked with the unit number and complete address for the
space the units are serving. Power disconnects to be provided at indoor and outdoor
units, with service receptacles within 25'.
5. Smoke detectors with automatic shut -off to be provided with both new units.
Detectors to be tied into existing fire detection/alarm system.
If you have any questions or require any additional information, please do not hesitate to
call.
Sincerely,
McKinstry Co.
C y : ]
01;&3 ,-t■
Dan Osborne
Project Manager
5400 N.E. Columbia Blvd. • Portland, OR 97218 • (503) 331 -0234
MCKIN* *372ND • CCB #40981
CITY OF TIGARD
May 20, 1998
OREGON
McKinstry Co.
5400 NE Columbia Blvd.
Portland, OR 97218
RE: Thayer Co. Mechanical Plan Review
73y2_--7344W Kahle Lane
PC #: 04 -107c MEC#: 98 -0141
Submittal documents for the above referenced project have been reviewed for
conformance with the applicable 1996 Oregon Specialty Codes and other applicable
codes and standards. The following comments are noted:
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1. The attachment of permanent equipment (HVAC) supported by the building's
structural components shall be designed to resist the total design seismic forces
prescribed in Section 1603.2 of the Structural Specialty Code. Provide an
engineer's design specifying attachment requirements [OSSC, Section 106.3.2
and OMSC, Section 304.4).
2. The exhaust and makeup air systems shall be interconnected by an electrical
interlocking switch [OMSC, Section 402.4].
3. 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,
13125 SW Hall Blvd., Tigard, OR 97223 (503) 639 -4171 TDD (503) 684 -2772
4
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Thayer Co. Mechanical Plan Review
PC #: 04 -107c BUP#: 98 -0141
Page #2
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.
1. Provide outside air specifications on revised plans.
4. 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].
5. 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
detectors shall be supervised when a fire detection or alarm system is provided
[OMSC, Section 608].
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,
Ro rt Poskin, CBO
SEN. R PLANS EXAMINER
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