Pre-Design and Design Phase Commissioning: OPR and BOD

1. Introduction: The Foundation of Project Success

In the lifecycle of any modern construction project, ensuring that the final facility operates exactly as the owner intended is paramount. This is where the discipline of Commissioning (Cx) becomes critical. Commissioning is a systematic, quality-oriented process for achieving, verifying, and documenting that the performance of facilities, systems, and assemblies meets defined objectives and criteria. While commissioning spans the entire project from pre-design to post-occupancy, its application during the Pre-Design and Design Phases lays the essential groundwork for success. This early engagement is centered around two foundational documents: the Owner's Project Requirements (OPR) and the Basis of Design (BOD).

The OPR is the cornerstone of the commissioning process. It is a comprehensive document that captures the owner's vision, goals, and expectations for the project. It goes beyond simple functional needs to detail measurable performance criteria, energy efficiency targets, indoor environmental quality standards, operational and maintenance (O&M) requirements, and budget constraints. The OPR serves as the master guide and the ultimate benchmark against which all design, construction, and operational decisions are measured.

The BOD, developed by the design team, is the direct response to the OPR. It documents the concepts, calculations, and design decisions made to meet the owner's requirements. The BOD provides the narrative and technical justification for the design, explaining how the selected systems and assemblies will achieve the performance criteria outlined in the OPR. Together, the OPR and BOD form a critical feedback loop, ensuring that the project's design remains aligned with the owner's goals from the very beginning.

Engaging a commissioning authority (CxA) during these early phases is not just a best practice; it is a strategic investment. It helps prevent costly changes during construction, reduces operational issues, and ultimately leads to a higher-performing, more efficient, and more reliable facility. This deep dive explores the intricacies of pre-design and design phase commissioning, providing a comprehensive guide to developing robust OPR and BOD documents and navigating the associated standards, procedures, and challenges.

This process is applicable to a wide range of project types, including but not limited to:

• New Construction: Implementing commissioning from the ground up ensures quality is built in, not bolted on.
• Major Renovations: For significant retrofits or additions, recommissioning ensures new systems integrate seamlessly with existing ones.
• Mission-Critical Facilities: Data centers, hospitals, and laboratories, where system failure has severe consequences, rely heavily on rigorous commissioning.
• High-Performance Buildings: Projects pursuing certifications like LEED or WELL use commissioning to verify and document the achievement of advanced sustainability and wellness goals.

By establishing a clear and verifiable framework for project success, pre-design and design phase commissioning transforms the owner's vision into a tangible, high-quality reality.

2. Standards and Guidelines for Commissioning

The commissioning process is guided by a robust framework of industry standards and guidelines, ensuring consistency, quality, and comprehensive application across diverse projects. Adherence to these standards is crucial for achieving project objectives and often a prerequisite for certification programs.

ASHRAE Guideline 0: The Commissioning Process

ASHRAE Guideline 0-2019, "The Commissioning Process" [1], serves as the foundational document for commissioning. It outlines a systematic, quality-focused process for enhancing the delivery of a project by achieving, validating, and documenting that the performance of facilities, systems, and assemblies meets the Owner’s Project Requirements (OPR). This guideline describes the commissioning process from pre-design through occupancy and operation, detailing responsibilities, documentation requirements, and activities for each phase. It provides a template for Commissioning Plans and establishes common content for various levels of commissioning.

ASHRAE Guideline 1.x Series

Complementing Guideline 0, the ASHRAE Guideline 1.x series provides specific technical guidance for commissioning various building systems:

• ASHRAE Guideline 1.1-2007, "The HVAC Commissioning Process" [2], focuses on the technical requirements for HVAC&R systems, detailing how commissioning activities for these systems should be managed and delivered.
• Other guidelines in this series address specific systems like electrical, plumbing, and building envelope commissioning, providing detailed procedures and best practices.

NEBB (National Environmental Balancing Bureau)

NEBB is a leading certification body for firms and individuals in the building systems industry, including Building Systems Commissioning (BSC). NEBB-certified firms adhere to rigorous procedural standards that ensure systems are operating per contract requirements. Their approach goes beyond standard commissioning by testing the performance of all building systems and tracking and mitigating all issues [3]. NEBB certification signifies a high level of competence and promotes proper execution of projects through compliance with their comprehensive procedural standards.

AABC (Associated Air Balance Council)

AABC is another prominent organization that certifies qualified test and balance agencies and commissioning providers. While primarily known for Test and Balance (TAB), AABC also provides guidelines and certification for commissioning. AABC-certified commissioning firms are required to demonstrate independence from manufacturers and contractors, ensuring unbiased verification of system performance. Their standards emphasize the importance of accurate and reliable data for system optimization and acceptance.

LEED (Leadership in Energy and Environmental Design)

LEED, developed by the U.S. Green Building Council (USGBC), is a widely recognized green building certification program. Commissioning is a fundamental requirement for most LEED certification levels, particularly for energy-related credits. LEED mandates both Fundamental Commissioning and Verification and offers additional points for Enhanced Commissioning. The commissioning process under LEED ensures that energy-related systems are designed, installed, and operate according to the OPR and design documents, contributing to energy efficiency and overall building performance [4]. Key aspects include:

• Fundamental Commissioning: Requires a CxA to perform commissioning process activities for mechanical, electrical, plumbing, and renewable energy systems and assemblies.
• Enhanced Commissioning: Awards additional points for more extensive commissioning activities, such as reviewing contractor submittals, developing a systems manual, and conducting post-occupancy performance reviews.

WELL Building Standard

The WELL Building Standard, managed by the International WELL Building Institute (IWBI), focuses on enhancing human health and well-being through the built environment. Commissioning plays a vital role in WELL certification by verifying that building systems and features designed to support health and well-being are performing as intended. This includes aspects related to air, water, nourishment, light, fitness, comfort, and mind. While specific commissioning requirements are integrated throughout the WELL features, the overarching goal is to ensure that the building actively contributes to the occupants' health and productivity.

3. Process and Procedures: Pre-Design and Design Phase Commissioning

The commissioning process is a structured, iterative approach that begins long before construction. In the pre-design and design phases, the focus is on establishing clear project goals, documenting design intent, and ensuring that the design will meet the owner's performance expectations. This proactive engagement helps to identify and resolve potential issues early, reducing costly changes and delays during later project stages.

3.1 Pre-Design Phase

The pre-design phase is foundational for successful commissioning. It is during this stage that the owner's vision and project goals are formally articulated and documented.

3.1.1 Develop Owner's Project Requirements (OPR)

The development of the OPR is the cornerstone of the pre-design phase. The Commissioning Authority (CxA), in collaboration with the owner and key stakeholders (including operations and maintenance staff, and end-users), facilitates discussions to define the project's functional requirements and goals. The OPR should be a comprehensive document detailing [1]:

• Project Goals: Overall objectives, such as sustainability targets, budget constraints, and schedule.
• Environmental Requirements: Indoor environmental quality (temperature, humidity, ventilation, acoustics, lighting), energy efficiency targets, and water conservation goals.
• Occupant Needs: Comfort, health, safety, and productivity considerations.
• Operational Requirements: Maintainability, accessibility for service, system reliability, and expected equipment lifespan.
• Training Requirements: Needs for O&M personnel training.
• Documentation Requirements: Specific formats and content for commissioning deliverables.

The OPR is a living document that is reviewed and updated throughout the project lifecycle to reflect evolving needs and design decisions. It serves as the benchmark for verifying project success.

3.1.2 Preliminary Commissioning Plan

A preliminary Commissioning Plan is developed in the pre-design phase. This plan outlines the overall commissioning scope, identifies the CxA and other commissioning team members, defines their roles and responsibilities, and establishes a preliminary schedule and budget for commissioning activities [1].

3.2 Design Phase

The design phase translates the OPR into a detailed design. The CxA's involvement during this phase is crucial for ensuring that the design intent aligns with the OPR and that the systems are commissionable.

3.2.1 Develop Basis of Design (BOD)

The design team develops the Basis of Design (BOD) in response to the OPR. The BOD is a narrative and technical document that explains how the design will meet the requirements outlined in the OPR. It includes [1]:

• Design Intent: Explanation of the design philosophy and how it addresses the OPR.
• System Descriptions: Detailed descriptions of selected systems (e.g., HVAC, electrical, plumbing) and their components.
• Performance Criteria: Specific performance metrics for systems and equipment.
• Assumptions: Key assumptions made during the design process.
• Codes and Standards: Applicable codes, standards, and guidelines followed.
• Sequences of Operation: Preliminary sequences of operation for control systems.

The CxA reviews the BOD to ensure its completeness, accuracy, and alignment with the OPR. Discrepancies are identified and resolved through a collaborative process.

3.2.2 Design Reviews

The CxA conducts formal design reviews at various stages of design development (e.g., schematic design, design development, construction documents). These reviews focus on [1]:

• OPR Compliance: Verifying that the design meets all aspects of the OPR.
• Commissionability: Assessing the ease with which systems can be commissioned, including access for testing, instrumentation, and control capabilities.
• Maintainability: Evaluating the design for ease of maintenance and operations.
• Constructibility: Identifying potential construction issues that could impact system performance.
• Documentation: Reviewing specifications and drawings for clarity and completeness regarding commissioning requirements.

3.2.3 Update Commissioning Plan

The Commissioning Plan is updated throughout the design phase to reflect design decisions, refined scopes, and detailed schedules. This updated plan includes specific commissioning tasks for each system, roles and responsibilities, and a detailed timeline for activities leading up to and including functional testing.

3.3 Checklists in Pre-Design and Design Phases

Checklists are essential tools for ensuring thoroughness and consistency throughout the commissioning process. In the pre-design and design phases, checklists are used to verify that critical steps are completed and that documentation is accurate and comprehensive.

3.3.1 OPR Development Checklist

This checklist ensures that all necessary topics are covered during the OPR development process, including energy efficiency goals, indoor air quality, comfort criteria, and operational expectations.

3.3.2 BOD Review Checklist

Used by the CxA to systematically review the BOD for alignment with the OPR, completeness of system descriptions, and clarity of performance criteria.

3.3.3 Design Review Checklists

These checklists are tailored to specific design review milestones and focus on verifying that the design incorporates commissioning requirements, provides adequate access for maintenance, and includes necessary instrumentation and controls for testing.

By diligently following these processes and utilizing comprehensive checklists, pre-design and design phase commissioning establishes a strong foundation for a high-performing building that meets the owner's expectations.

4. Pre-Functional Checklists (PFCs)

Pre-Functional Checklists (PFCs) are critical tools used during the commissioning process to verify that equipment and systems are properly installed, calibrated, and ready for functional testing. PFCs are typically completed during the construction phase, prior to system startup and functional performance testing. Their primary purpose is to ensure that all static and initial operational conditions are met, preventing potential damage to equipment and streamlining the functional testing process [5].

Importance of PFCs

• Installation Verification: PFCs confirm that equipment has been installed according to manufacturer specifications, design documents, and project requirements.
• Quality Assurance: They serve as a quality control measure, identifying and rectifying installation deficiencies before they become more complex and costly problems.
• Safety: By verifying proper installation and initial setup, PFCs help ensure the safe operation of systems.
• Efficiency: Completing PFCs thoroughly reduces the time and effort required for functional testing by minimizing issues encountered during dynamic operation.
• Documentation: PFCs provide a documented record of installation completeness and readiness for operation.

Typical Items Covered in HVAC PFCs

For HVAC systems, PFCs cover a wide range of components and aspects, including but not limited to:

• Equipment Installation:
  • Verification of correct equipment model and serial numbers against submittals.
  • Proper mounting, leveling, and securing of equipment (e.g., air handling units, chillers, boilers, pumps).
  • Adequate clearances for maintenance and service access.
  • Cleanliness of equipment and surrounding areas.
• Piping Systems:
  • Proper installation of piping, including insulation, hangers, and supports.
  • Leak testing and pressure testing of all piping systems (e.g., chilled water, hot water, refrigerant, condensate).
  • Flushing and cleaning of piping systems.
  • Installation of valves, strainers, gauges, and thermometers in correct locations.
• Ductwork Systems:
  • Ductwork installation, sealing, and insulation as per specifications.
  • Installation of diffusers, grilles, registers, and fire/smoke dampers.
  • Verification of duct leakage testing results.
• Electrical Systems:
  • Correct wiring and termination of power and control circuits.
  • Verification of motor rotation and overload protection settings.
  • Proper grounding and labeling of electrical components.
  • Confirmation of power availability and voltage.
• Control Systems:
  • Installation of sensors, actuators, and control panels.
  • Verification of sensor calibration and addressing.
  • Network connectivity for DDC (Direct Digital Control) systems.
  • Confirmation of proper labeling for all control components.
• Ancillary Components:
  • Installation of vibration isolators, flexible connections, and access panels.
  • Filter installation and cleanliness.
  • Belt tension and alignment for fan and pump motors.

Process for Completing PFCs

1. Development: PFCs are typically developed by the CxA, often based on manufacturer recommendations, project specifications, and industry best practices. They are reviewed and approved by the design team and owner.
2. Execution: Contractors or installers complete the PFCs for their respective systems. The CxA observes and verifies the completion of these checklists, often performing spot checks or detailed inspections.
3. Documentation: Completed PFCs are signed off by the installing contractor and the CxA, becoming part of the permanent commissioning documentation. Any deficiencies identified are recorded in an issues log and tracked to resolution.

Only after the successful completion and verification of all relevant PFCs can functional testing commence, ensuring a smooth and effective commissioning process.

5. Functional Test Procedures (FTPs)

Functional Test Procedures (FTPs), also known as Functional Performance Tests (FPTs), are dynamic tests conducted to verify that systems and equipment operate correctly and interact as intended under various conditions. These tests simulate actual operating conditions and sequences to ensure that the installed systems meet the Owner's Project Requirements (OPR) and Basis of Design (BOD) [6]. FTPs are typically performed after all Pre-Functional Checklists (PFCs) have been completed and verified.

Objectives of Functional Testing

• Verify Performance: Confirm that systems and equipment perform according to design specifications and the OPR under all modes of operation (e.g., occupied, unoccupied, warm-up, cool-down, emergency).
• Validate Control Sequences: Ensure that control systems (e.g., DDC, BAS) execute their programmed sequences of operation accurately and respond appropriately to changes in conditions and setpoints.
• Identify Deficiencies: Uncover any operational issues, programming errors, or component failures that were not detected during static checks.
• Optimize System Operation: Fine-tune system settings and controls to achieve optimal energy efficiency and occupant comfort.
• Document Performance: Provide documented evidence of system performance, which is crucial for project closeout, warranty claims, and ongoing operations.

Detailed Test Sequences

FTPs involve a series of step-by-step sequences designed to exercise all components and modes of operation of a system. For HVAC systems, this includes:

• Start-up and Shut-down Sequences: Verifying proper system initiation and termination, including interlocks and safeties.
• Mode Changes: Testing transitions between occupied/unoccupied modes, heating/cooling modes, and different setpoint conditions.
• Capacity and Load Response: Simulating various load conditions (e.g., peak heating, peak cooling, partial load) to ensure the system can maintain desired indoor conditions.
• Failure Modes and Safeties: Testing responses to simulated equipment failures, power outages, and safety alarms (e.g., high/low pressure cutouts, freeze protection).
• Interlocks and Alarms: Verifying proper operation of interlocks between different systems and the activation of alarms under abnormal conditions.
• Trend Data Analysis: Collecting and analyzing trend data from building management systems (BMS) to evaluate system stability, response times, and overall performance.

Pass/Fail Criteria

Each step within an FTP must have clear, measurable pass/fail criteria. These criteria are derived from the OPR, BOD, project specifications, and manufacturer's data. Examples include:

• Temperature Control: Maintaining space temperature within a specified range (e.g., ±1°F or ±0.5°C) of the setpoint.
• Humidity Control: Maintaining relative humidity within a specified range.
• Airflow Rates: Achieving design airflow rates (e.g., ±10%) at diffusers and grilles.
• Pressure Differentials: Maintaining specified pressure differentials across filters or between zones.
• Response Times: Systems responding to changes in setpoints or conditions within a defined timeframe.
• Alarm Activation: Alarms activating correctly and at the appropriate thresholds.
• Energy Consumption: Meeting specified energy consumption targets under various operating conditions.

Any deviation from the pass/fail criteria constitutes a deficiency, which is documented in the issues log and must be resolved before the system can be accepted.

Instruments Required

Accurate and calibrated instrumentation is essential for conducting effective FTPs. The specific instruments required will vary depending on the system being tested, but commonly include:

• Temperature Sensors: Calibrated thermometers, thermistors, or thermocouples for measuring air, water, and surface temperatures.
• Humidity Sensors: Psychrometers or electronic humidity sensors for measuring relative humidity.
• Airflow Measurement Devices: Anemometers, capture hoods, or pitot tubes for measuring air velocity and flow rates.
• Pressure Gauges/Transducers: Manometers, differential pressure gauges, or transducers for measuring static and differential pressures in air and water systems.
• Electrical Meters: Multimeters, clamp-on ammeters, and power meters for measuring voltage, current, and power consumption.
• Data Loggers: Devices for recording temperature, humidity, pressure, and other parameters over time.
• Infrared Cameras: For identifying thermal anomalies in building envelopes and equipment.
• Sound Level Meters: For measuring noise levels.
• Control System Interface: Laptops or dedicated workstations with appropriate software to interface with the BMS for monitoring, trending, and manipulating control points.

The CxA is responsible for ensuring that all testing instruments are properly calibrated and that testing personnel are proficient in their use. The results of all FTPs are meticulously documented, providing a comprehensive record of system performance and compliance with project requirements.

6. Acceptance Criteria

Acceptance criteria are the measurable performance benchmarks and tolerances that determine whether a commissioned system or component meets the Owner's Project Requirements (OPR) and design intent. These criteria are established early in the commissioning process, typically during the pre-design and design phases, and are used throughout functional testing to determine pass or fail status. Clear and well-defined acceptance criteria are essential for objective evaluation and successful project handover [7].

Key Elements of Acceptance Criteria

• Measurable Performance: Criteria must be quantifiable and verifiable through testing and observation.
• Tolerances: Acceptable deviations from specified performance values (e.g., ±5% of design airflow).
• Operational Modes: Criteria should apply to all relevant operating conditions (e.g., full load, part load, seasonal variations).
• Safety and Reliability: Ensuring systems operate safely and reliably under all conditions.
• Documentation: Requirements for how performance data is recorded and presented.

Developing Acceptance Criteria

Acceptance criteria are developed collaboratively by the CxA, design team, and owner, drawing from:

• Owner's Project Requirements (OPR): The primary source for defining desired performance outcomes.
• Basis of Design (BOD): Details how the design intends to meet the OPR.
• Project Specifications: Technical requirements for equipment and systems.
• Manufacturer's Data: Performance data and operating limits for specific equipment.
• Industry Standards: Relevant ASHRAE, NEBB, AABC, LEED, and WELL standards.

The criteria are documented in the Commissioning Plan and individual Functional Test Procedures (FTPs).

Examples of Acceptance Criteria for HVAC Systems

• Space Temperature: Maintain 72°F ± 2°F (22°C ± 1°C) during occupied hours.
• Relative Humidity: Maintain 40-60% RH in critical areas.
• Ventilation Airflow: Achieve minimum outdoor air rates as per ASHRAE 62.1 ± 10%.
• Fan/Pump Performance: Operate within ±5% of design flow and pressure at specified RPM.
• Control System Response: Achieve setpoint within 15 minutes of mode change.
• Noise Levels: Not to exceed NC-35 in occupied spaces.

Failure to meet established acceptance criteria indicates a deficiency that must be addressed and re-tested until compliance is achieved.

7. Common Deficiencies

During the Pre-Design and Design Phases of commissioning, common deficiencies often stem from incomplete documentation, lack of clarity in requirements, or insufficient coordination among project stakeholders. Identifying and addressing these issues early is crucial to prevent costly rework and delays in later project stages.

Typical Deficiencies Related to OPR:

• Vague or Incomplete OPR: The Owner's Project Requirements document may lack specific details regarding performance expectations, environmental conditions, operational needs, or future flexibility. This ambiguity can lead to design interpretations that do not align with the owner's true intent.
• Lack of Measurable Criteria: OPR statements might describe desired outcomes without defining measurable metrics or verification methods. For example, stating a desire for 'comfortable indoor conditions' without specifying temperature ranges, humidity levels, or air change rates.
• Failure to Update OPR: As the project progresses and new information becomes available, the OPR may not be consistently reviewed and updated, leading to a disconnect between the owner's evolving needs and the design.
• Insufficient Stakeholder Input: The OPR may be developed without adequate input from all relevant stakeholders, including facility operators, maintenance staff, and end-users, resulting in requirements that are impractical or do not meet operational realities.

Typical Deficiencies Related to BOD:

• Incomplete or Inaccurate BOD: The Basis of Design document may not fully capture all design assumptions, system selections, or design narratives, making it difficult to understand the rationale behind design decisions.
• Discrepancies Between OPR and BOD: The BOD might not clearly demonstrate how the design addresses and meets each requirement outlined in the OPR. Gaps or contradictions between these two foundational documents are common.
• Lack of Design Intent Documentation: Critical design decisions, such as equipment sizing, control strategies, or material selections, may not be adequately documented with their underlying justifications.
• Failure to Incorporate Commissioning Requirements: The design documents may not explicitly include provisions for commissioning activities, such as access for testing, instrumentation requirements, or specific sequences of operation for functional testing.
• Coordination Issues: Poor coordination between different design disciplines (e.g., architectural, structural, mechanical, electrical, plumbing) can lead to conflicts, spatial constraints, or incompatible system designs that hinder commissioning.

Resolution Guidance:

• Iterative Review and Feedback: Implement a structured review process for both OPR and BOD, involving all key stakeholders. Encourage open communication and provide clear feedback mechanisms.
• Develop Measurable Requirements: For every OPR statement, define specific, measurable, achievable, relevant, and time-bound (SMART) criteria. The CxA should assist the owner in refining these requirements.
• Traceability Matrix: Create a traceability matrix that links each OPR requirement to specific design elements in the BOD and subsequent construction documents. This helps ensure all owner requirements are addressed.
• Early CxA Involvement: Engage the Commissioning Authority (CxA) as early as possible in the Pre-Design phase. The CxA can provide valuable input on OPR development, BOD review, and the integration of commissioning requirements into the design.
• Regular Design Reviews: Conduct regular, multidisciplinary design reviews with a focus on commissionability. This includes reviewing system layouts, control sequences, and access for maintenance and testing.
• Clear Documentation Standards: Establish clear standards for design documentation, ensuring that all assumptions, calculations, and design narratives are thoroughly recorded.
• Communication Plan: Develop a comprehensive communication plan to facilitate information exchange and decision-making among all project team members.

By proactively addressing these common deficiencies during the early project phases, the commissioning process can significantly enhance project quality, reduce risks, and ensure that the final building systems meet the owner's performance expectations.

8. Documentation Requirements

Comprehensive and accurate documentation is a cornerstone of a successful commissioning process, particularly during the Pre-Design and Design Phases. The documentation generated during these early stages forms the foundation for all subsequent commissioning activities and serves as a critical reference throughout the building's lifecycle. Key documentation requirements include:

1. Owner's Project Requirements (OPR):

• Purpose: The OPR is a written document that details the functional requirements of the project and the expectations of how it will be used and operated. It defines the project goals, measurable performance criteria, environmental conditions, operational needs, and other critical parameters from the owner's perspective.
• Content: Should include, but not be limited to, project goals, facility use, occupant requirements, indoor environmental quality (temperature, humidity, ventilation, lighting, acoustics), energy efficiency goals, maintainability, operational flexibility, system reliability, and budget considerations.
• Evolution: The OPR is a living document that should be reviewed and updated throughout the Pre-Design and Design Phases as the project evolves and more information becomes available.

2. Basis of Design (BOD):

• Purpose: The BOD is a narrative document prepared by the design team that describes how the design addresses and meets the OPR. It explains the systems, components, and methodologies selected to achieve the owner's requirements.
• Content: Should include design assumptions, system descriptions, performance criteria, sequences of operation, control strategies, equipment selections, energy modeling results, and a clear explanation of how each OPR item is satisfied.
• Relationship to OPR: The BOD must directly reference and respond to each requirement outlined in the OPR, demonstrating a clear line of accountability and design intent.

3. Commissioning Plan:

• Purpose: The Commissioning Plan is a dynamic document that outlines the organization, scope, and implementation of the commissioning process. It defines the roles and responsibilities of the commissioning team, the systems to be commissioned, and the overall schedule.
• Content (Pre-Design/Design Phase Focus): During these early phases, the plan should establish the commissioning team, define the scope of commissioning (systems, phases), outline the process for OPR and BOD review, specify documentation requirements, and set preliminary schedules for commissioning activities.

4. Design Review Reports:

• Purpose: Formal reports documenting the findings and recommendations from commissioning-focused design reviews. These reviews ensure that the design is commissionable, maintainable, and meets the OPR.
• Content: Should include a summary of the review process, identified issues, recommended resolutions, and a log of action items with responsible parties and due dates.

5. Issues Log (or Commissioning Issue Tracking Log):

• Purpose: A centralized document used to track all identified deficiencies, concerns, and recommendations throughout the commissioning process. It ensures that issues are formally documented, assigned, and resolved.
• Content: Each entry should include a unique ID, date identified, description of the issue, responsible party, recommended resolution, status, date resolved, and verification notes.

6. Systems Manual (Preliminary):

• Purpose: A comprehensive document that provides building operators with the information needed to understand, operate, and maintain the building's systems efficiently. A preliminary version begins during the design phase.
• Content (Design Phase Focus): Early contributions include system narratives, sequences of operation, control diagrams, and preliminary O&M (Operations & Maintenance) information.

7. O&M Training Plan (Preliminary):

• Purpose: Outlines the strategy for training building operators and maintenance staff on the proper operation and maintenance of the commissioned systems. A preliminary plan is developed during design.
• Content: Identifies target audience, training objectives, topics to be covered, proposed training methods, and schedule.

These documents are not static; they evolve with the project. Regular updates, reviews, and clear communication are essential to ensure their accuracy and effectiveness in guiding the commissioning process and ultimately delivering a high-performing building.

9. Roles and Responsibilities

Effective commissioning during the Pre-Design and Design Phases relies heavily on clear delineation of roles and responsibilities among all project stakeholders. Early engagement and defined contributions ensure that commissioning goals are integrated into the project from its inception.

1. Commissioning Authority (CxA):

• Primary Role: The CxA is the independent party responsible for leading, planning, and managing the commissioning process. Their early involvement is critical for success.
• Pre-Design Phase Responsibilities:
  • Assists the owner in developing and refining the Owner's Project Requirements (OPR).
  • Develops the preliminary Commissioning Plan.
  • Provides input on commissioning specifications.
  • Facilitates communication among project team members regarding commissioning.
• Design Phase Responsibilities:
  • Reviews design documents (drawings, specifications, submittals) for compliance with the OPR and for commissionability, maintainability, and operability.
  • Develops detailed commissioning specifications.
  • Refines the Commissioning Plan.
  • Assists the design team in developing sequences of operation and control strategies.
  • Participates in design review meetings.
  • Begins development of Pre-Functional Checklists (PFCs) and Functional Test Procedures (FTPs).

2. Owner:

• Primary Role: The owner is the ultimate decision-maker and the primary driver of the project's goals and requirements.
• Pre-Design Phase Responsibilities:
  • Clearly defines the project goals and expectations.
  • Provides comprehensive input for the development of the OPR.
  • Approves the OPR and the preliminary Commissioning Plan.
  • Allocates necessary resources and budget for commissioning.
• Design Phase Responsibilities:
  • Reviews and approves design documents, ensuring alignment with the OPR.
  • Makes timely decisions regarding design changes and commissioning recommendations.
  • Ensures that the CxA has access to all necessary project information and team members.

3. Design Engineer (Architects and Engineers):

• Primary Role: The design team is responsible for translating the OPR into a functional and constructible design.
• Pre-Design Phase Responsibilities:
  • Develops the Basis of Design (BOD) in response to the OPR.
  • Collaborates with the CxA and owner to ensure the OPR is understood and addressed.
• Design Phase Responsibilities:
  • Develops detailed design documents (drawings, specifications) that meet the OPR and BOD.
  • Incorporates commissioning requirements into the design, including access, instrumentation, and control points.
  • Responds to CxA comments and recommendations during design reviews.
  • Develops sequences of operation and control narratives.
  • Attends design review and commissioning meetings.

4. Contractor (General Contractor and Subcontractors):

• Primary Role: While their primary involvement in execution is during construction, their input during design can be valuable.
• Pre-Design/Design Phase Responsibilities (if engaged early):
  • Provides constructability input during design reviews.
  • Offers insights into potential installation challenges or sequencing issues that could impact commissioning.
  • Reviews commissioning specifications for clarity and feasibility.

5. Facility Operations and Maintenance (O&M) Staff:

• Primary Role: The end-users and maintainers of the building systems.
• Pre-Design Phase Responsibilities:
  • Provides critical input to the OPR regarding operational needs, maintenance preferences, and existing facility standards.
  • Identifies potential operational challenges based on past experience.
• Design Phase Responsibilities:
  • Participates in design reviews to ensure systems are maintainable, accessible, and align with operational capabilities.
  • Reviews preliminary O&M manuals and training plans.

Clear communication channels and a collaborative approach among these roles are essential for a successful commissioning process that ensures the building performs as intended and meets the owner's long-term operational goals.

10. Cost and Schedule

Integrating commissioning into the Pre-Design and Design Phases of a project, while incurring initial costs, consistently demonstrates a significant return on investment (ROI) through reduced change orders, improved system performance, lower operating costs, and enhanced occupant comfort. Understanding the typical cost and schedule implications is crucial for effective project planning.

Typical Commissioning Costs:

Commissioning costs are highly variable and depend on several factors, including project size, complexity, system types, and the scope of commissioning services. However, general estimates can provide a useful benchmark:

• Percentage of Total Construction Cost: Commissioning services typically range from 0.5% to 1.5% of the total construction cost for new construction projects. For complex or critical facilities (e.g., hospitals, data centers), this percentage can be higher.
• Breakdown by Phase:
  • Pre-Design & Design Phases: A significant portion of the CxA's effort, often 30-40% of the total commissioning fee, is expended during these early stages. This upfront investment is critical for establishing a solid foundation and preventing costly issues later.
  • Construction Phase: Typically 40-50% of the fee, covering installation verification, functional testing oversight, and issue resolution.
  • Acceptance & Warranty Phase: The remaining 10-20% for final documentation, training, and post-occupancy support.
• Factors Influencing Cost:
  • Scope of Commissioning: The number and complexity of systems being commissioned (e.g., HVAC, lighting, plumbing, fire protection, building envelope).
  • Project Delivery Method: Design-bid-build, design-build, or integrated project delivery can influence how commissioning services are procured and managed.
  • CxA Experience and Qualifications: Highly experienced and certified CxAs may command higher fees, but often deliver greater value.
  • Geographic Location: Labor rates and market conditions vary by region.

Return on Investment (ROI) of Early Commissioning:

Studies and industry experience consistently show that early commissioning pays for itself many times over. The ROI is realized through:

• Reduced Change Orders: Proactive identification and resolution of design flaws during the design phase minimize costly changes during construction.
• Improved Energy Performance: Commissioned buildings often achieve 5-15% better energy efficiency than non-commissioned buildings, leading to significant operational savings over the building's lifespan.
• Fewer Callbacks and Warranty Issues: Systems that are properly installed and functionally tested experience fewer breakdowns and warranty claims.
• Enhanced Occupant Comfort and Productivity: Properly functioning systems contribute to a more comfortable and productive indoor environment.
• Extended Equipment Lifespan: Systems operating as designed experience less wear and tear, extending their useful life.
• Reduced Litigation Risk: Clear documentation and verification reduce disputes and potential legal issues.

Commissioning Schedule:

The commissioning schedule is integrated into the overall project schedule and begins during the Pre-Design phase, extending through construction, acceptance, and into the warranty period. Key milestones during the early phases include:

• Pre-Design Phase (Project Inception - Schematic Design):
  • CxA Selection: Early selection of the CxA is paramount.
  • OPR Development: Initial OPR development and review (typically 2-4 weeks).
  • Preliminary Commissioning Plan: Development of the initial plan.
• Design Phase (Schematic Design - Construction Documents):
  • BOD Review: Ongoing review of the Basis of Design (BOD) for compliance with OPR.
  • Design Reviews: Multiple formal design reviews (e.g., 30%, 60%, 90% design completion) focusing on commissionability (each review cycle 2-4 weeks).
  • Commissioning Specification Development: Drafting and refinement of commissioning specifications (ongoing).
  • PFC & FTP Development: Initial development of Pre-Functional Checklists and Functional Test Procedures (ongoing).
  • Updates to Commissioning Plan: Regular updates to reflect design progress.

Effective scheduling ensures that commissioning activities are seamlessly integrated, preventing delays and maximizing the benefits of the process.

11. FAQ Section

This section addresses common questions regarding Pre-Design and Design Phase Commissioning, Owner's Project Requirements (OPR), and Basis of Design (BOD).

Q1: Why is early involvement of the Commissioning Authority (CxA) so critical in the Pre-Design and Design Phases?

A1: Early involvement of the CxA is paramount because it allows them to influence the project from its foundational stages. During Pre-Design, the CxA assists the owner in developing a clear and measurable Owner's Project Requirements (OPR), ensuring that the owner's vision is accurately captured. In the Design Phase, the CxA reviews design documents for commissionability, maintainability, and compliance with the OPR, identifying potential issues before they become costly problems during construction. This proactive approach minimizes change orders, reduces risks, and ensures the final building systems meet performance expectations.

Q2: What is the primary difference between the Owner's Project Requirements (OPR) and the Basis of Design (BOD)?

A2: The OPR defines what the owner wants the building and its systems to achieve, focusing on functional requirements, performance criteria, and operational needs from the owner's perspective. It's a statement of desired outcomes. In contrast, the BOD explains how the design team plans to meet those OPRs. It's a technical narrative describing the design assumptions, system selections, and methodologies used to achieve the owner's requirements. Essentially, the OPR sets the target, and the BOD describes the strategy to hit that target.

Q3: How do LEED and WELL Building Standard requirements impact commissioning during the Pre-Design and Design Phases?

A3: Both LEED and WELL Building Standard emphasize the importance of commissioning from the project's outset. For LEED, fundamental commissioning is a prerequisite, requiring a CxA to be engaged by the end of the design development phase to review the OPR, BOD, and design documents. Enhanced commissioning credits encourage even earlier engagement and more comprehensive activities. Similarly, the WELL Building Standard integrates commissioning into its various concepts, requiring verification of system performance to ensure occupant health and well-being. Both standards drive the need for a robust commissioning process, starting with clear OPRs and thorough design reviews, to achieve certification and high-performance buildings.

Q4: What are the most common deficiencies found in OPR and BOD documents, and how can they be avoided?

A4: Common deficiencies in OPRs include vagueness, lack of measurable criteria, and insufficient stakeholder input, leading to designs that don't fully align with owner expectations. For BODs, issues often arise from incompleteness, inaccuracies, discrepancies with the OPR, and inadequate documentation of design intent. These can be avoided by engaging the CxA early to facilitate OPR development with SMART (Specific, Measurable, Achievable, Relevant, Time-bound) criteria, establishing a clear traceability matrix between OPR and BOD, conducting regular and multidisciplinary design reviews, and ensuring thorough documentation of all design assumptions and decisions. Iterative review and feedback loops are crucial.

Q5: What is the typical Return on Investment (ROI) for investing in commissioning during the early project phases?

A5: Investing in commissioning during the Pre-Design and Design Phases yields a significant ROI, often paying for itself many times over. The benefits include a substantial reduction in change orders during construction, as design flaws are caught early. Commissioned buildings typically achieve 5-15% better energy efficiency, leading to lower operating costs over the building's lifespan. Furthermore, there are fewer callbacks and warranty issues, extended equipment lifespan due to proper installation and operation, enhanced occupant comfort and productivity, and reduced litigation risks. The upfront cost of commissioning is a small percentage of the total project cost but delivers long-term value and performance.

Related Resources

For further information on HVAC commissioning and related topics, please explore the following resources:

• HVAC Glossary
• HVAC Commissioning
• HVAC Controls
• HVAC Measurement and Testing
• HVAC Quality Control