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Hospital Commissioning
Case Study
WellStar Paulding Hospital
Hiram, Georgia
Rusty Ross, PE, CxA – SSRCx
Rick Ziegler, PE – SSRCx
Michael Paul - WellStar
The Project
$125 Million Replacement Hospital
295,000 SQFT, Eight Floors
56 beds, expandable to 112 beds (6th & 7th floors shelled)
40 ER exam rooms
4 surgical suites
First Patient – March 28, 2014
Commissioning Scope
• Review the energy model
• Design reviews at 100% DDs and 100% CDs
• Cx Specifications
Commissioning Scope
• Cx Plan
• Shop Drawing Review
• Prepare Installation
Checklists monitor subs
execution of these
• Prepare Functional Test
Procedures, direct
execution, document
Commissioning Scope
• Review:
– T&B report
– O&Ms
– O&M staff training
• Final Report
• Opposed Season
• Warranty Meeting
Commissioning Scope
Mechanical Systems
Domestic Hot Water
Fire Protection
Fire Alarm
Electrical Distribution
Essential Electrical System (Emergency Power)
Lighting Controls
Building Envelope
Mechanical systems
• Multistack chiller (1,050 T) uses ground
water loop when needed
– Full Load testing to be conducted summer 2014
– Primary mode is simultaneous heating and
Mechanical systems
Desiccant AHUs serve Surgery
DOAS units serve multiple AHU systems
Air valves on supply and return in OR systems
412 Tons of air-cooled Chillers serve DOAS
Energy Model Review
• Energy Star Target
Score: 94
• Model not updated for
100% CD design
• Walls sections in model
don’t match design
• Insulation in roof in
model different from
• Roof deck design
(thickness) ≠ model
Energy Model Review
• Thermal resistance of
windows over estimated in
the model
• Sun shade sizing differ
between mode and design
• DOAS, AHU and exhaust
fan power understated in
model vs 100% CDs
• AHU SAT reset schedule in
the EM ≠ the design
Energy Model Review
• Energy model over
estimates unoccupied
operating timeframe, thus
under estimating energy
95% CD Plan Review - Mechanical
• No detail provided for piping propane
(secondary fuel) to steam boilers
95% CD Plan Review - Mechanical
• No conditioned air in main
electrical room
• Plans did not indicate all isolation
valves and flushing connections
in Ground Loop system or at the
Heat Pump Chiller
• No SOO defined for atrium
smoke evacuation function
• No SOO for VAV boxes in kitchen
tracking variable flow in range
hood exhaust and dishwasher
95% CD Plan Review - Mechanical
• Incomplete or missing
SOO for stairwell
pressurization and
elevator shaft smoke vent
• Purging and pressure
testing procedures for
ground loop piping not
defined in the
95% CD Plan Review - Electrical
• No lighting controls SOO provided
• No lighting controls specification included
• Obstruction lighting control not defined, no
photocell shown
• Initiation of stairwell pressurization not
• Electrical riser diagram, 4 dry type
transformer shown fed from incorrect panels
• 13 Panel schedules omitted from drawings
• No IR scanning windows in some SWGR
95% CD Plan Review - Electrical
• BOD states emergency generators shall be bi-fuel.
Specifications do not require this capability.
• “Pole” requirements for shunt trip breakers serving
loads under kitchen hoods not identified in panel
Findings – HVAC Hydronics
• CHW flow required for
AHUs greater that CHW
system output.
(Strainers were loaded,
had to be cleaned 3
times over course of
• Surgery Unit and AHUImaging not able to
maintain DAT 55º with
CHS @ 42º. (Strainers)
Findings - BAS
• OR AHU SAT controlled by 3 factors. Design
sequence changed to insure SAT did not rise
above desired conditions.
– Dew point control
– Temperature reset in unoccupied mode
• OR pressure control incorrect (setpoints
• OR pressure alarms did not alarm when
rooms negative (programming)
• Critical zone reset for SP setpoint not
programmed for Surgery system
Findings - BAS
• Surgery AHU Return Air SP safety tripped 5x when
in un-occupied mode (added sensors)
• DOAS and AHU SP control initially caused tripping
of both systems on SP alarms (programming - rate
of operation of control dampers)
• HWPs and CHWPs did not operate in parallel
(ramped individually in series)
• Lag HWP and CHWP did
not cycle off as load reduced
Findings - BAS
• SAT reset based on dew point not
• Humidifier not able to control to setpoint
• DOAS filter alarms not programmed
• Isolation Room alarms failed to alarm
Findings - BAS
• Isolation exhaust
stand-by fan
does not start
when “lead” fan
fails (N+1
Findings - BAS
• Graphics incomplete and/or inaccurate
Findings - BAS
• No time of use schedule programmed for
boilers (3 total, 1 stand-by)
• No communication between FO system
and BAS
• Sensors defective (MAT)
• Domestic Booster pump alarms not
• Domestic Hot water alarms not
Findings – Fire Alarm System/ Life Safety
• Dry Pipe system annunciation did not
identify area protected
• Inoperable tamper switches on A/S control
• Elevator recall programming incorrect
Findings – Lighting Controls
Occupancy sensors not programmed
Occupancy sensors would not time out
Lighting controls not programmed
Sensors blocked by OFE
Findings – Emergency Power
• Load Demand control setpoint
initially set too low (operated 2
gensets when load required 1)
• Day Tank FO return pump did not
operate when high level alarm
activated (G1)
• FO return pump not operable
• Priority Loads and Load Demand
functions operated correctly
MEP Lessons Learned
• Ready to test
– Despite scheduling, not ready to test
– Programming incomplete, incorrect setpoints
– Conflict between incomplete state and need
to finish prior to occupancy
• Controls associated with OR AHUs and
OR space controls
• Restart of AHUs on Emergency Power
Project Timeline
Enclosure Commissioning
Environmental Separation
Control heat flow
Control airflow
Control vapor flow
Control rain
Control groundwater
Control light and solar
• Control noise and vibration
• Control insects, rodents,
and vermin
• Control fire
• Provide strength and
• Be durable
Owner’s Project Requirements
• Design life of at least 50 years
• No systemic water leaks, all leaks resolved prior
to occupancy
• Whole building air leakage rate of 0.1 cfm/sf @
75 Pa
• Slight positive pressure
• Intent is to have continuous air, water, and
thermal protection
Design Phase
Owner’s Project Requirements
Two Design Reviews
Specification Development
Review of Energy Model
Design Phase
Pre-Construction Phase
• Submittal and shop drawing reviews
• Mock-up construction and testing
• Update to functional performance test plan
Mock-up Summary
Water leakage at window collar flashings
Masonry tie air leakage at one location
Whole mock-up air leakage testing pass
Significant air leakage at roof to wall interface
Curtain wall water leaks
Retesting and next steps
Construction Phase
Construction Phase
Construction Phase
Construction Phase

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