Commissioning lighting control systems

Codes and standards require lighting engineers to include power allowances, daylighting controls, functional testing, and commissioning in lighting designs to verify lighting controls.

Jesse Felter and Tom Divine, Smith Seckman Reid Inc.
Figure 2: Functional testing of automated window shades is shown at night. The sequence of operation calls for shades to close after dusk. Here, all shades are open at night. The photograph has been lightened to highlight shade position. All graphics cou

This article is peer-reviewed.Learning Objectives:

Commissioning is a quality assurance process intended to ensure that completed facilities perform according to owners’ expectations. Activities involved in commissioning include establishing expectations, design review, submittal review, verifying the installation, functional testing, and post-construction documentation.

Requirements for lighting controls become more complex with each edition of the energy-conservation codes. Codes and standards include ASHRAE Standard 90.1: Energy Standard for Buildings Except Low-Rise Residential Buildings, the International Energy Conservation Code (IECC), and California Title 24. With each level of increased complexity, the benefits of formally commissioning lighting control systems increase. Those benefits include:

There are many steps to examine when commissioning lighting controls, following energy code requirements. ASHRAE 90.1, the International Energy Conservation Code, and California Title 24 all require some form of commissioning activity, in varying levels of detail.  Title 24 provides a lot of detail in its commissioning and testing requirements.

Figure 1: The drawing illustrates a portion of the lighting plan of clinical and administrative space in a 1.2 million-sq-ft building with hospital and business occupancies. Lighting controls are implemented with occupancy sensors, occupant-operated switcEstablishing the scope of commissioning services

The appropriate scope of commissioning services will be different for every owner, and for every project. Some owners place a high value on commissioning and call for extensive services. Others may see commissioning as an unwelcome necessity, required by codes or corporate practices, and will contract for the minimum level of service that meets the requirement.

Minimal commissioning projects will generally include only prescribed functional testing services, with limited review services. More thoroughly commissioned projects will call for a complete array of services including any or all of the following items:

Most recommended practices and standards for commissioning strongly recommend that the commissioning firm is independent of the design team, the construction team, and other project participants and reports directly to the owner where project procurement requirements allow. In practice, that means nearly all projects, with the exception of certain government-owned projects with rigid contracting requirements. The entity in charge of the commissioning project is typically called the commissioning authority (CxA).

The elements of an owner’s project requirements

The commissioning process begins with developing a written description of the owner’s needs and expectations for a facility in a document traditionally called the OPR. The OPR describes the expected use, performance, and costs of the facility.

The OPR is created by the owner in conjunction with the CxA and the design team. If the construction team is engaged early in the project, those team members will participate as well. The OPR will include a description of the project, including its size, location, and intended use, along with primary project goals, such as the schedule and total budget. The OPR will also cover more specific requirements for building systems including performance, maintainability, and warranty requirements. It will describe any special requirements and contain a list of the applicable codes and standards.

In practice, the development of the OPR will take the form of a negotiation, with the owner balancing various project goals against one another, and the CxA and design team acting as mediators. It is rare for an initial project budget to be compatible with the goals for project quality, cost, and schedule. In general, some adjustments will be required to harmonize those requirements. In terms of lighting and lighting controls, the requirements of the locally enforced energy-conservation code will establish a basis for functionality and cost.

Figure 2: Functional testing of automated window shades is shown at night. The sequence of operation calls for shades to close after dusk. Here, all shades are open at night. The photograph has been lightened to highlight shade position. All graphics couCertain elements of the OPR will affect the implementation of lighting components and lighting system controls:

The OPR may be periodically updated during the course of the project to reflect design decisions, owner-driven changes, and resolution of unanticipated construction issues. As the design progresses and cost estimates are refined, the OPR adjusts to manage costs or enhance the functionality of the facility with available funds.

Figure 3: Functional testing of automated window shades is shown during daylight hours. The sequence of operation calls for shades on the same building face to operate in unison. Here, shades in the upper left part of the image are closed.Basis of design

The BOD is a document describing the design team’s technical approach to realizing the elements of the OPR and complying with applicable codes. The BOD is developed by the design team. The lighting controls portion of the BOD, often called the “lighting controls narrative,” describes how the control system functions, its sequences of operations, and its user controls for each space. 

Recent energy-conservation codes require more functionality and flexibility from lighting control systems than their predecessors did. The lighting controls narrative describes how the system will comply with the requirements of applicable energy codes including:

The BOD serves as the reference for design reviews throughout the design process. Like the OPR, the BOD is periodically reviewed and updated to reflect changes in strategy as the design progresses.

The CxA reviews the design at least once before construction documents are issued, to determine that the design is consistent with the OPR. Additional reviews may be performed at various stages of the project, in accordance with the scope of commissioning services agreed upon between the owner and CxA. The CxA typically provides comments and observations about the design, and the design team provides written responses.

During the design review, the CxA typically will also review and adjust the commissioning plan to address the developing design. The CxA will frame contractor-testing requirements into project requirements and add these requirements to the contract documents.

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