C408.2 Mechanical Systems and Service Water-Heating Systems Commissioning and Completion Requirements
Prior to the final mechanical and plumbing inspections, the registered design professional or approved agency shall provide evidence of mechanical systems commissioning and completion in accordance with the provisions of this section.
Construction document notes shall clearly indicate provisions for commissioning and completion requirements in accordance with this section and are permitted to refer to specifications for further requirements. Copies of all documentation shall be given to the owner or owner's authorized agent and made available to the code official upon request in accordance with Sections C408.2.4 and C408.2.5.
Exceptions: The following systems are exempt:
- Mechanical systems and service water heater systems in buildings where the total mechanical equipment capacity is less than 480,000 Btu/h (140.7 kW) cooling capacity and 600,000 Btu/h (175.8 kW) combined service water-heating and space-heating capacity.
- Systems included in Section C403.5 that serve individual dwelling units and sleeping units.
A commissioning plan shall be developed by a registered design professional or approved agency and shall include the following items:
- A narrative description of the activities that will be accomplished during each phase of commissioning, including the personnel intended to accomplish each of the activities.
- A listing of the specific equipment, appliances or systems to be tested and a description of the tests to be performed.
- Functions to be tested including, but not limited to, calibrations and economizer controls.
- Conditions under which the test will be performed. Testing shall affirm winter and summer design conditions and full outside air conditions.
- Measurable criteria for performance.
Each supply air outlet and zone terminal device shall be equipped with means for air balancing in accordance with the requirements of Chapter 6 of the International Mechanical Code. Discharge dampers used for air-system balancing are prohibited on constant-volume fans and variable volume fans with motors 10 hp (18.6 kW) and larger. Air systems shall be balanced in a manner to first minimize throttling losses then, for fans with system power of greater than 1 hp (0.746 kW), fan speed shall be adjusted to meet design flow conditions.
Exception: Fans with fan motors of 1 hp (0.74 kW) or less are not required to be provided with a means for air balancing.
Individual hydronic heating and cooling coils shall be equipped with means for balancing and measuring flow. Hydronic systems shall be proportionately balanced in a manner to first minimize throttling losses, then the pump impeller shall be trimmed or pump speed shall be adjusted to meet design flow conditions. Each hydronic system shall have either the capability to measure pressure across the pump, or test ports at each side of each pump.
Exception: The following equipment is not required to be equipped with a means for balancing or measuring flow
- Pumps with pump motors of 5 hp (3.7 kW) or less.
- Where throttling results in not greater than 5 percent of the nameplate horsepower draw above that required if the impeller were trimmed.
Equipment functional performance testing shall demonstrate the installation and operation of components, systems, and system-to-system interfacing relationships in accordance with approved plans and specifications such that operation, function, and maintenance serviceability for each of the commissioned systems is confirmed. Testing shall include all modes and sequence of operation, including under full-load, part-load and the following emergency conditions:
- All modes as described in the sequence of operation.
- Redundant or automatic back-up mode.
- Performance of alarms.
- Mode of operation upon a loss of power and restoration of power.
A preliminary report of commissioning test procedures and results shall be completed and certified by the registered design professional or approved agency and provided to the building owner or owner's authorized agent. The report shall be organized with mechanical and service hot water findings in separate sections to allow independent review. The report shall be identified as "Preliminary Commissioning Report," shall include the completed Commissioning Compliance Checklist, Figure C408.2.4, and shall identify:
- Itemization of deficiencies found during testing required by this section that have not been corrected at the time of report preparation.
- Deferred tests that cannot be performed at the time of report preparation because of climatic conditions.
- Climatic conditions required for performance of the deferred tests.
- Results of functional performance tests.
- Functional performance test procedures used during the commissioning process, including measurable criteria for test acceptance.
A report of test procedures and results identified as "Final Commissioning Report" shall be delivered to the building owner or owner's authorized agent. The report shall be organized with mechanical system and service hot water system findings in separate sections to allow independent review. The report shall include the following:
- Results of functional performance tests.
- Disposition of deficiencies found during testing, including details of corrective measures used or proposed.
- Functional performance test procedures used during the commissioning process including measurable criteria for test acceptance, provided herein for repeatability.
Exception: Deferred tests that cannot be performed at the time of report preparation due to climatic conditions.