COMMISSION 
AGENDA MEMORANDUM                        Item No.          8d 
ACTION ITEM                            Date of Meeting      January 4, 2022 

DATE:     December 10, 2021 
TO:        Stephen P. Metruck, Executive Director 
FROM:    Eileen Francisco, Interim Director, Aviation Facilities & Capital Programs 
Wayne Grotheer, Director Aviation Project Management Group 
SUBJECT:  Chiller Control Panel Upgrade Project Phase 2 (C801181)  Project Approval 
Amount of this request:               $1,258,000 
Total estimated project cost:          $1,288,000 
ACTION REQUESTED 
Request Commission authorization  for the Executive  Director  to  (1)  prepare  design  and 
construction bid documents for the Chiller Panel Upgrade project phase 2 at Seattle-Tacoma 
International Airport (STIA), and (2) develop, advertise, and execute a Public Works Building
Engineering Systems Contract to replace chiller control panels in the Central Mechanical Plant. 
The amount of this request is $1,258,000 for a total estimated project cost of $1,288,000. 
EXECUTIVE SUMMARY 
The reliable operation of the Central Mechanical Plant (CMP) is essential for passenger comfort
and Sea-Tac Airport operations. This project ensures operational integrity of the CMP through
the removal and replacement of the integrated control panels for five chiller units in the CMP.
The control panels for the five chillers are at the end of their useful life and are no longer
manufactured. If the control panels fail, the result is the chiller not being operable, reducing
chilling capacity and placing the Airport at risk of loss of essential facility cooling including
terminal, tenant,  office areas, electrical, data and communication rooms , and all aircraft cooling
through the preconditioned air system. This upgrade will replace the integrated control panels at 
the chiller, as well as any necessary hardware to maintain the existing interfaces to the Building
Automation System (BAS) Direct Digital Controls (DDC), and to the chiller starters located
remotely in the electrical room.
JUSTIFICATION 
The reliable operation of the CMP is essential for passenger comfort and Sea-Tac Airport
operations. This project ensures operational integrity of the CMP through the removal and
replacement of the integrated control panels for 5 chiller units in the CMP. If one or more chiller
panels fail, the airport chilling capacity will be reduced greatly for the summer season.

Template revised January 10, 2019.

COMMISSION AGENDA  Action Item No. __8d__                              Page 2 of 4 
Meeting Date: January 4, 2022 
Diversity in Contracting 
Project staff is engaged with Diversity in Contracting and is collaborating on a cohesive plan to 
establish women and minority owned business enterprise (WMBE) aspirational goals and 
inclusion plan. 
DETAILS 
In the central mechanical plant, replace and upgrade the chiller control panels on chillers 1, 2, 5,
6, and 8 with an updated visual control screen that will match chillers 3, 4, and 7 that were
upgraded in phase 1 of this project in 2019 under a separate CIP. The existing chiller control
panels are no longer manufactured and if they fail the chillers will not operate and provide
cooling to the airport terminal. The chiller control panel interfaces between the chiller, starter,
motor, oil system, compressor, and the building automation system to achieve the cooling
process required by the airport terminal. The 5 chillers each produce 1500 to 2,100 tons of
cooling and together represent 55% of the cooling capacity in the central plant. This upgrade will
replace the integrated control panels at each chiller as well as any necessary hardware to
maintain the existing interfaces to the building automation system and the chiller starters located
remotely in the electrical room. The new control panels will provide an updated visual control
screen, more reliability, updated software, and utilize parts that are readily available for future
service issues. 
Scope of Work 
Replace and upgrade the chiller control panels on chillers 1, 2, 5, 6, and 8. Replace hardware to 
maintain the existing interfaces to the BAS, and to the chiller starters located remotely in the 
electrical room. Add conduit, wire, fiber, and programming required to achieve the replacement 
of the panel and interface to the electrical starters and BAS. Commission each of the 5 chillers at 
the  component,  equipment,  and  then  systems  level  to  ensure  each  chiller  operates 
independently  and  in  concert  with  the  others  to  achieve  the  airport  terminal  cooling 
requirements. 
Schedule 
The proposed schedule is to complete this project in Q3 2022. 
Activity 
Design start                                       2022 Quarter 1 
Commission construction authorization          2022 Quarter 1 
Construction start                                2022 Quarter 2 
In-use date                                       2022 Quarter 3 



Template revised June 27, 2019 (Diversity in Contracting).

COMMISSION AGENDA  Action Item No. __8d__                              Page 3 of 4 
Meeting Date: January 4, 2022 
Cost Breakdown                                      This Request           Total Project 
Design                                                    $344,000               $374,000 
Construction                                              $871,000               $871,000 
Total                                                         $1,258,000              $1,288,000 
ALTERNATIVES AND IMPLICATIONS CONSIDERED 
Alternative 1  Do not perform the Chiller Upgrade. 
Cost Implications: $30,000 of funding gets expensed 
Pros: 
(1)   None 
Cons: 
(1)   Project will cost more in the future when infrastructure fails. 
(2)   Infrastructure providing terminal cooling is at risk of failing. 
This is not the recommended alternative. 
Alternative 2  Complete the project as proposed. 
Cost Implications: $1,288,000 
Pros: 
(1)   Fastest option for accomplishing the project 
Cons: 
(1)   None 
This is the recommended alternative. 
FINANCIAL IMPLICATIONS 
Cost Estimate/Authorization Summary               Capital        Expense           Total 
COST ESTIMATE 
Original estimate                                 $1,288,000               $0      $1,288,000 
AUTHORIZATION 
Previous authorizations                             $30,000                0                0 
Current request for authorization                $1,258,000                0      $1,258,000 
Total authorizations, including this request       $1,288,000                0      $1,288,000 
Remaining amount to be authorized                    $0             $0             $0 


Template revised June 27, 2019 (Diversity in Contracting).

COMMISSION AGENDA  Action Item No. __8d__                              Page 4 of 4 
Meeting Date: January 4, 2022 
Annual Budget Status and Source of Funds 
This project, CIP C801181, was included in the 2022-2026 capital budget and plan of finance with
a budget of $1,288,000. The funding source will be the Airport Development Fund. 
Financial Analysis and Summary 
Project cost for analysis              $1,288,000 
Business Unit (BU)                  Terminal Building 
Effect on business performance     NOI after depreciation will increase due to inclusion of
(NOI after depreciation)             capital (and operating) costs in airline rate base 
IRR/NPV (if relevant)                N/A 
CPE Impact                       Less than $.01 in 2023 
Future Revenues and Expenses (Total cost of ownership) 
This project ensures the asset life of the chillers is realized. There is no anticipated increase to
Operations and Maintenance costs for this project. 
ATTACHMENTS TO THIS REQUEST 
None 
PREVIOUS COMMISSION ACTIONS OR BRIEFINGS 
January 2, 2017, Commission approval for C800811 Chiller Panel Upgrade Project 









Template revised June 27, 2019 (Diversity in Contracting).