Correspondence Mil TEMP • CONTROL MECHANICAL CORPORATION FAX (503) 285 -9978
MECHANICAL CONTRACTORS
4800 N. CHANNEL AVE. • P.O. BOX 11065 • PORTLAND, OREGON 97211 • (503) 285 -9851
October 19, 1998
RECEIVED
Mr. Robert Poskin 1 1998
Senior Plans Examiner OCT
City of Tigard COMMUNITY Uot.,,;;- .:,t.,+l
13125 SW Hall Blvd.
Tigard, OR 97223
RE: Western Family Foods
TCM Job #6704
MEC #98 -0367, PC #08 -70c
Dear Robert:
Below is the information requested in your letter dated August 27, 1998.
1. The large rooftop unit (RTU -1) will set on a factory steel curb which sets on a raised concrete
tub. The factory curb will be anchored to the concrete using (12) 3/8" wedge anchors
embedded into the concrete 3 inches. This is designed to resist both lateral and vertical loads
of 50,000 lbs (3 times the weight of the unit). The factory curb for the small unit (RTU -2)
O � � will be lagged to the wood levelling curb using (6) 3/8" X 3" lag bolts designed to resist lateral
and vertical loads of 3000 pounds (3 times the unit weight). Both units will be bolted to their
factory curb in accordance with the manufacturer's installation instructions. The unit
locations, sizes and weights have been provided to the structural engineer and have been
incorporated into the design of the structure below the units. Please refer to the structural
drawings.
3. Duct - mounted smoke detectors will be mounted in the supply duct below each unit. The
Or detectors will be hard wired to the respective rooftop unit to shut it down if smoke is detected.
The auxilary contacts on each detector will be monitored by the supervisory input on the
Simplex fire panel.
5. Both rooftop units will be equipped with fully modulating outside air economizers. The
minimum position for RTU -1 will be set by the air balance at 4800 cfm (240 occupancy @ 20
cfm/person). The minimum position for RTU -2 will be set at 100 cfm (5 people maximum in
the computer room). The minimum position on both units is programmed through the DDC
control system and is only accessible to those that have the password and know how to
program the system. The economizer dampers will not close below the pre -set minimum
position except when the unit is off (at which time the dampers will close). Attached are two
copies of the drawing showing the revised equipment schedule.
AIR CONDITIONING • INDUSTRIAL PIPING • HEATING • PLUMBING • SHEET METAL
DESIGN /BUILD MECHANICAL SYSTEMS • MAINTENANCE
"Proud Of Our Work!"
A r
r-
October 19, 1998
Page 2
In addition, we have discussed the following by phone:
1. The ventilation fans for the Area of Rescue Assistance do not need to be on back -up power. It
0 is acceptable for the rooms to be exhausted (under negative pressure).
A t)/ 2. The ducts that pass through the second floor are not required to have fire /smoke dampers.
c . The hood above the stove top is a Class II non - grease type hood.
Please contact me if you require any additional information in order to issue the mechanical
permit. Thank you for your assistance.
Sincerely,
TEMP - CONTROL MECHANICAL CORPORATION
•Z N\-AN\ ,,Q0
Duane Monroe, P.E.
c: Dale Kuykendall (McCormack- PacificyWade Gill//Master /lob book
1 y
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August 27, 1998 CITY OF TIG�
OREGON
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Temp Control Mechanical
PO Box 11065
Portland, OR 97211
RE: Western Family Foods Mechanical Plan Review
6700 SW Sandburg
PC #: 08 -70c MEC #: 98 -0367•
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:
MECHANICAL
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. 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].
3. Air moving systems RTU -1 and RTU -2 shall be equipped with automatic shut -off.
The smoke detectors shall be supervised with the fire detection /alarm system,
provide details. OMSC, Section 608.
4. Duct openings into the protected corridors shall be equipped with 1 hour fire
dampers. OSSC, Section 1005.8.2, 713.10 and 713.11.
5. 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:
13125 SW Hall Blvd., Tigard, OR 97223 (503) 639 -4171 TDD (503) 684 -2772
Western Family Foods : . Mechanical Plan Review •
PC #: 08 -70c BUP #: 98 -0367
Page #2 •
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.
i. Provide outside air specifications on revised plans.
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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 :4`" .•
have any questions.
•
Sincerely, •
Ro rt Poskin, CBO
SENIOR PLANS EXAMINER