Title 24 · California Energy Code

Which Reference Appendices define the FVDT procedures and ECC roles?

Q: Who must enter test results into the RA2 registry?

When the Part 6 clause requires RA2 registry reporting the ECC‑Provider / ECC‑Rater enters the required test data and metadata; some multifamily exceptions shift responsibility to the installer certification instead .

Q: For tall multifamily (≥4 stories) do I ignore RA3 and RA2?

No. Many Part 6 requirements exempt the RA2 registry and RA3 reporting for units in buildings four habitable stories and greater, but the Part 6 text still requires compliance with performance criteria — often via installer certification or alternate NA procedures for common areas; verify the exact Part 6 clause for that building type .

The Energy Code requires using **RA3** procedures to measure duct leakage, airflow, refrigerant charge and ventilation, and **RA2** for ECC‑Provider reporting unless an explicit Part 6 exception applies (e.g., some tall multifamily buildings); NA1/NA2 are the nonresidential equivalents cited by Part 6.

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Last reviewed: July 6, 2026

What the code requires

The California Energy Code requires that field verification and diagnostic testing (FVDT) procedures and the Energy Code Compliance (ECC) roles used to confirm HVAC airflow, refrigerant charge, duct leakage, and ventilation performance be performed using the test methods and registry rules found in the Reference Appendices. The controlling appendices are Reference Residential Appendix RA2 (ECC‑Provider registry and data reporting), Reference Residential Appendix RA3 (detailed test procedures — including RA3.1, RA3.2, RA3.3, RA3.7), and the nonresidential equivalents Reference Nonresidential Appendix NA1 / NA2 for multifamily / nonresidential applications. These appendices are referenced throughout Part 6 requirements (for example § 150, § 160, § 170, § 180) as the required procedures for compliance .

The single most important rule: use the test procedures in RA3 for how to measure airflow, charge, duct leakage and ventilation, and use RA2 for ECC‑Provider reporting/registry unless an explicit exception in the Part 6 sections applies .

Requirements in detail

Which appendices control which activities

Reference Residential Appendix RA2 — ECC‑Provider registry requirements and when/what test data must be recorded and submitted; referenced across Part 6 mandatory and prescriptive requirements (exceptions for some multifamily conditions) .
Reference Residential Appendix RA3 — the step‑by‑step FVDT procedures: duct leakage & sealing (RA3.1), refrigerant charge verification (RA3.2), system airflow and static probe requirements (RA3.3), ventilation test and certification procedures including Central Fan Integrated (RA3.7) — explicitly cited by Sections in § 150, § 160, § 170, and § 180 for compliance verification .
Reference Nonresidential Appendix NA1 / NA2 — alternate or additional FVDT procedures for multifamily and nonresidential ventilation, energy‑recovery, and large fan systems; used where Part 6 directs (e.g., tall multifamily buildings) .

Decision‑relevant dimensions (quick table)

Decision / measurement	Required value or procedure	Code reference
Duct leakage (altered systems)	≤ 15% of air‑handler airflow (or ≤ 10% to outside) using RA3.1 procedures	§ 180.2(b)2Aiii
Duct leakage (multifamily as-built)	≤ 12% total leakage or ≤ 6% to outside using RA3.1 procedures	§ 160.3(b)5K
Minimum system airflow (typical)	350 cfm/ton (single‑zone central forced air), verified per RA3.3	§ 160.3(b)5Lii
Small‑duct high‑velocity	≥ 250 cfm/ton, RA3.3 procedures	§ 160.3(b)5Liv
Refrigerant charge verification	Standard charge procedure (RA3.2.2) or weigh‑in (RA3.2.3.1) with ECC‑Rater verification per RA3.2.3.2	§ 150.1(c)7Aic / § 150.2(b)1Fiib
Static probe & fan efficacy checks	HSPP/PSPP location and labelling per RA3.3.1.1; fan efficacy limits (W/cfm) verified via RA3.3	§ 160.3(b)5Li / § 160.3(b)5Lii
Balanced ventilation / ERV/HRV verification	Test procedures in RA3.7 (or NA2 for taller multifamily)	§ 170.2(c)3Biv

Notes:

The code text explicitly requires the RA3 procedures for measurement and RA2 for recording/reporting unless an exception is stated in the applicable Part 6 section .
Nonresidential or taller multifamily buildings are sometimes directed to NA appendices instead of RA3/RA2; check the specific Part 6 clause cited for the building class .

Roles: who does what (ECC roles)

Installer — performs initial work and in many cases performs the installer portions of FVDT (for example, weigh‑in charging or performing the standard charge procedure) and certifies installation when exceptions apply; the applicable Part 6 section identifies which procedures the installer must perform and when the ECC‑Rater must verify .
ECC‑Rater (sometimes called ECC‑Provider/ECC‑Rater) — independent verifier who confirms measurements, completes required RA2 registry submissions (unless an exception applies), and conducts ECC‑Rater‑required RA3 verification steps (e.g., verifying weigh‑in charge and airflow per RA3.2 and RA3.3) .
Registry / ECC‑Provider — the data registry and reporting process are described in RA2; where RA2 is required the ECC‑Provider must enter test results and required metadata into the registry as part of compliance (unless the Part 6 section provides an exception for certain multifamily conditions) .

Exceptions & special cases

Multifamily buildings (≥ four habitable stories): many Part 6 sections explicitly exempt units in buildings four habitable stories and greater from the RA2 registry and RA3 reporting requirements; in those cases the installer may instead certify that diagnostic testing was performed per the applicable procedures (the Part 6 section will state the exception) — see multiple exceptions in § 150, § 160, § 170, § 180 .
Packaged systems pre‑charged at factory: entirely new packaged systems with manufacturer‑verified factory charge may be exempt from field charge verification; installer certifies pre‑charge and unaltered status (Part 6 exception language) .
Systems that cannot be tested with the specified procedure: Part 6 sometimes allows alternative RA1 procedures or specific RA3 subsections (e.g., use RA3.3 exceptions or RA1 approved alternatives) — follow the Part 6 cross‑reference to RA1/RA3 for allowed alternate methods .
Climate / temperature specific alternate procedures: where outdoor temperature is < 55°F, weigh‑in charging verification may use the alternate verification procedure in RA3.2.3.2 if the Part 6 section permits it; this also triggers thermostat specification requirements (check the cited Part 6 clause) .

If a specific Part 6 section or building configuration is not covered in the retrieved snippets, consult the applicable Part 6 section and the referenced RA/NA appendix text directly — the uploaded excerpts show the cross‑references but not the full RA/NA text in every case.

Common mistakes

Thinking RA2/RA3 are optional — they are the required procedures for FVDT and reporting where the Part 6 language calls them out; exceptions are explicit and limited (e.g., tall multifamily) .
Using a manufacturer procedure instead of RA3 without an RA1‑approved alternative — the code requires RA3 procedures or an RA1 alternative when Part 6 references RA3 (for charge, airflow, leak testing) .
Failing to involve an ECC‑Rater when the Part 6 clause requires ECC‑Rater verification (e.g., weigh‑in charge verification and final registries) — check the specific Part 6 step to see which measurements need ECC‑Rater verification per RA3/RA2 .
Misapplying multifamily exceptions — the registry/reporting exception for buildings four habitable stories and greater does not remove all testing or sealing requirements; it changes reporting and who must submit data .

Worked example — altered single‑family ducted system

Scenario: A contractor replaces the outdoor condensing unit and evaporator coil on a single‑family ducted split system. The air handler and ducts remain the same.

The Part 6 alteration language requires duct sealing verification and refrigerant charge verification for altered mechanical cooling (see the applicable §) — follow the RA3 procedures referenced in that clause § 180.2(b)2Aiv and related subclauses .
Duct leakage target options (apply RA3.1 test):
- Option A: Measured leakage ≤ 15% of air‑handler airflow (use RA3.1.4.3.1) — test and calculate using RA3.1 methods .
- Option B: Leakage to outside ≤ 10% of air‑handler airflow (use RA3.1.4.3.4) .
  Choose the option the installer will aim for and perform RA3.1 leakage test accordingly.
Refrigerant charge: installer performs the standard charge procedure per RA3.2.2 (or weigh‑in per RA3.2.3.1 if applicable), then an ECC‑Rater verifies the charge using RA3.2 and confirms airflow per RA3.3. If outdoor temperature is < 55°F and weigh‑in is used, the alternate verification in RA3.2.3.2 may be used (check thermostat condition requirements) .
Registry: unless the project falls into a Part 6 exception (e.g., multifamily ≥ 4 stories), the ECC‑Provider / ECC‑Rater must submit required data to the RA2 registry per RA2 instructions; otherwise the installer certifies testing was performed as allowed by the exception .

Numbers used in this example (15%, 10%, 55°F) come directly from the Part 6 cross‑references to RA3 and the associated exceptions in the uploaded code text .

Related provisions

§ 150.1(c)7A — refrigerant charge verification references RA3 charge procedures .
§ 150.2(b)1F — altered cooling system charge/airflow verification references RA3.2 / RA3.3 and RA2 registry rules .
§ 160.3(b)5K / 5L — multifamily duct leakage / airflow and fan efficacy verification reference RA3.1 / RA3.3 and RA3.7; RA2 registry exceptions for tall multifamily appear here .
§ 170.2(c)3B — dwelling ventilation, ERV/HRV verification and RA3.7 / NA2 cross‑references .
§ 180.2(b)2A — altered space‑conditioning requirements, duct sealing and charge verification referencing RA3 and RA2 .

If you need the explicit RA2 registry fields, the step‑by‑step RA3 test procedures (RA3.1.4.3.1, RA3.2.2 steps, RA3.3 probe locations, RA3.7 ventilation sequences), or the NA1/NA2 text, I can extract those specific subsections from the reference appendix files you uploaded (those detailed appendix pages were not all included in the snippets above). Please tell me which appendix subsection you want verbatim (for example RA3.1.4.3.1 or RA3.2.3.2) and I will pull and cite it directly.

Code references

Grounded in the retrieved California Energy Code — click a citation to read the verbatim passage:

§ 1.4.3.1 High relevance — show source text
a. The measured duct leakage shall be equal to or less than 15 percent of air handler airflow as determined utilizing the procedures in Reference Residential Appendix Section RA3.1.4.3.1; or b. The measured duct leakage to outside shall be equal to or less than 10 percent of air handler airflow as determined utilizing the procedures in Reference Residential Appendix Section RA3.1.4.3.4; or c. If it is not possible to meet the duct sealing requirements of either Section 180.2(b)2Aiiia or b, then all accessible leaks shall be sealed and verified through a visual inspection and a smoke test by a certified ECC-Rater utilizing the methods specified in Reference Residential Appendix RA3.1.4.3.5. Exception 1 to Section 180.2(b)2Aiii : duct sealing. Duct systems that are documented to have been previously sealed as confirmed through field verification and diagnostic testing in accordance with procedures in Reference Residential Appendix RA3.1. Exception 2 to Section 180.2(b)2Aiii: duct sealing. Duct systems with less than 40 linear feet as determined by visual inspection. Exception 3 to Section 180.2(b)2Aiii: duct sealing. Existing duct systems constructed, insulated or sealed with asbestos.

Exception 4 to Section 180.2(b)2Aiii: The field verification and ECC-Provider data registry requirements of Reference Residential Appendix RA2 and RA3 are not required for multifamily dwelling units in buildings four stories and greater. The installer shall certify that diagnostic testing was performed in accordance with the applicable procedures. iv. Altered space-conditioning system mechanical cooling. When a space-conditioning system is an air conditioner or heat pump that is altered by the installation or replacement of refrigerant-containing system components such as the compressor, condensing coil, evaporator coil, refrigerant metering device or refrigerant piping, the altered system shall comply with the following requirements: a. All thermostats associated with the system shall be replaced with setback thermostats meeting the requirements of Section 110.2(c). b. In Climate Zones 2 and 8 through 15, air-cooled air conditioners and air-source heat pumps, including but not limited to ducted split systems, ducted package systems, small duct high velocity air systems, and minisplit systems, shall comply with Subsections I and II, unless the system is of a type that cannot be verified using the specified procedures. Systems that cannot comply with the requirements of Section 180.2(b)2Aivb shall comply with Section 180.2(b)2Aivc. Exception to Section 180.2(b)2Aivb: Entirely new or complete replacement packaged systems for which the manufacturer has verified correct system refrigerant charge prior to shipment from the factory are not required to have refrigerant charge confirmed through field verification and diagnostic testing. The installer of these packaged systems shall certify that the packaged system was pre-charged at the factory and has not been altered in a way that would affect the charge. Ducted systems shall comply with the minimum system airflow rate requirement in Section 180.2(b)2AivbI, provided that the system is of a type that can be verified using the procedure specified in RA3.3 or an approved alternative in RA1. I. The minimum system airflow rate shall comply with the applicable Subsection A or B below as confirmed through field verification and diagnostic testing in accordance with the procedures specified in Reference Residential Appendix Section RA3.3 or an approved alternative procedure as specified in Section RA1.
§ 150.1 High relevance — show source text
Exception to Section 150.1(c)7Aib: Standard ducted systems without zoning dampers may comply with the minimum airflow rate by meeting the applicable requirements in Table 150.0-B or 150.0-C as confirmed by field verification and diagnostic testing in accordance with the procedures in Reference Residential Appendix Section RA3.1.4.4 and RA3.1.4.5. The design clean-filter pressure drop requirements of Section 150.0(m)12D for the system air filter device(s) shall conform to the requirements given in Tables 150.0-B and 150.0-C.

c. The installer shall charge the system according to manufacturer’s specifications. Refrigerant charge shall be verified according to one of the following options, as applicable: I. The installer and rater shall perform the standard charge procedure as specified by Reference Residential Appendix Section RA3.2.2, or an approved alternative procedure as specified by Section RA1; or

II. The installer shall perform the weigh-in charging procedure as specified by Reference Residential Appendix Section RA3.2.3.1 provided the system is of a type that can be verified using the Section RA3.2.2 standard charge verification procedure and Section RA3.3 airflow rate verification procedure or approved alternatives in Section RA1. The ECC-Rater shall verify the charge using Sections RA3.2.2 and RA3.3 or approved alternatives in Section RA1. Exception 1 to Section 150.1(c)7Aic: When the outdoor temperature is less than 55°F and the installer utilizes the weigh-in charging procedure in Reference Residential Appendix Section RA3.2.3.1 to verify the refrigerant charge, the installer may elect to utilize the verification procedure in Reference Residential Appendix Section RA3.2.3.2. If the verification procedure in Section RA3.2.3.2 is used for compliance, the system's thermostat shall conform to the specifications in Section 110.12. Ducted systems shall comply with minimum system airflow rate requirement in Section 150.1(c)7Aib. ii. Air-cooled air conditioners and air-source heat pumps, including but not limited to ducted split systems, ducted packaged systems, small duct high-velocity systems and mini-split systems, which are of a type that cannot be verified using the specified procedures, with the requirements of Section 150.1(c)7Ai shall comply with Subsections a and b, as applicable. a. The installer shall confirm the refrigerant charge using the weigh-in charging procedure specified in Reference Residential Appendix Section RA3.2.3.1, as verified by an ECC-Rater according to the procedures specified in Reference Residential Appendix Section RA3.2.3.2.; and b. Systems that utilize forced air ducts shall comply with the minimum system airflow rate requirement in Section 150.1(c)7Aib provided the system is of a type that can be verified using the procedures in Section RA3.3 or an approved alternative procedure in Section RA1.
§ 2.2 High relevance — show source text
Refrigerant charge shall be verified according to one of the following options, as applicable. I. The installer and rater shall perform the standard charge verification procedure as specified in Reference Residential Appendix Section RA3.2.2, or an approved alternative procedure as specified in Section RA1; or

II. The installer shall perform the weigh-in charging procedure as specified by Reference Residential Appendix Section RA3.2.3.1, provided the system is of a type that can be verified using the RA3.2.2 standard charge verification procedure and RA3.3 airflow rate verification procedure or approved alternatives in RA1. The ECC-Rater shall verify the charge using RA3.2.2 and RA3.3 or approved alternatives in RA1.

Exception to Section 150.2(b)1Fiib: When the outdoor temperature is less than 55°F and the installer utilizes the weigh-in charging procedure in Reference Residential Appendix Section RA3.2.3.1 to demonstrate compliance, the installer may elect to utilize the verification procedure in Reference Residential Appendix Section RA3.2.3.2. If the verification procedure in Section RA3.2.3.2 is used for compliance, the system’s thermostat shall conform to the specifications in Section 110.12. Ducted systems shall comply with the minimum system airflow rate requirements in Section 150.2(b)1Fiia. iii. Air-cooled air conditioners in Climate Zones 2 and 8 through 15 and air-source heat pumps in all climate zones, including but not limited to ducted split systems, ducted package systems, small duct high-velocity, and minisplit systems, which are of a type that cannot comply with the requirements of 150.2(b)1Fiib shall comply with Subsections a and b, as applicable. a. The installer shall confirm the refrigerant charge using the weigh-in charging procedure specified in Reference Residential Appendix RA3.2.3.1, as verified by an ECC-Rater according to the procedures specified in Reference Residential Appendix RA3.2.3.2; and b. Systems that utilize forced air ducts shall comply with the minimum system airflow rate requirement in Section 150.2(b)1Fiia provided the system is of a type that can be verified using the procedures in Section RA3.3 or an approved alternative procedure in Section RA1. Exception to Section 150.2(b)1Fiii: Entirely new or complete replacement packaged systems for which the manufacturer has verified correct system refrigerant charge prior to shipment from the factory are not required to have refrigerant charge confirmed through field verification and diagnostic testing. The installer of these packaged systems shall certify on the Certificate of Installation that the packaged system was pre-charged at the factory and has not been altered in a way that would affect the charge. Ducted systems shall comply with minimum system airflow rate requirement in Section 150.2(b)1Fiiib, provided that the system is of a type that can be verified using the procedure specified in Section RA3.3 or an approved alternative in Section RA1. G. Altered space-heating system. Altered or replacement space-heating systems shall not use electric resistance as the primary heat source. Exception 1 to Section 150.2(b)1G: Nonducted electric resistance space heating systems, if the existing space heating system is electric resistance. Exception 2 to Section 150.2(b)1G: Ducted electric resistance space heating systems, if the existing space heating system is electric resistance and a ducted space cooling system is not being replaced or installed.

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§ 9.1 High relevance — show source text
2. Conform to Section 10 of API Standard 2610 [9.1] (N/E). 3. Stems shall be oriented in a way not to pose a hazard in operation or maintenance (N/E). 4. Nonductile iron, cast iron and low-melting temperature metals shall not be used in any hydrocarbon service (N/E). 5. Double-block and bleed valves shall be used for manifold valves (N/E).

6. Isolation valves shall be fire-safe in accordance with API Standard 607 [9.10] (N). 7. Swing check valves shall not be installed in vertical down-flow piping (N/E). 8. Pressure relief devices shall be used in any closed piping system that has the possibility of being over pressurized due to temperature increase (thermal relief valves) (N/E). 9. Pressure relief devices shall be used in any piping system that has the possibility of being over pressurized due to surging, considering all plausible normal and abnormal operational scenarios in accordance with ASME B31.4 [9.3] (N/E). 10. Pressure relief devices shall be sized in accordance with API RP 520 [9.11] (N). Set pressures and accumulating pressures shall be in accordance with API RP 520 [9.11] (N/E). 11. Discharge from pressure relief valves shall be directed into lower pressure piping for recycling or proper disposal. Discharge shall never be directed into the open environment, unless secondary containment is provided (N/E). 12. Threaded, socket-welded, flanged and welded fittings shall conform to Section 8 of API Standard 2610 [9.1] (N/E). 13. ESD valves and SIVs shall also conform to the requirements of Sections 3108F.3.2.1 and 3108F.3.2.2.

3109F.5.2 Valve actuators (N/E).

1. Actuators shall have a readily accessible, manually operated overriding device to operate the valve during a power loss. 2. Torque switches shall be set to stop the motor closing operation at a specified torque setting. 3. Limit switches shall be set to stop the motor opening operation at a specified limit switch setting. 4. Critical valves shall be provided with thermal insulation. The insulation shall be inspected and maintained at periodic inter- vals. Records of thermal insulation inspections and condition shall be maintained for at least 6 years. 5. Electrical insulation for critical valves shall be measured for resistance following installation and retested periodically. These records shall be maintained for at least 6 years. 6. ESD valve and SIV actuators shall also conform to the requirements of Section 3108F.3.2.

3109F.6 Utility and auxiliary piping and pipeline systems. Utility and auxiliary piping includes service for: 1. Stripping and sampling 2. Vapor control 3. Natural gas 4. Compressed air, venting and nitrogen

Stripping and sampling piping shall conform to Section 3109F.2 (N/E).

Vapor return lines and VOC vapor inerting and enriching (natural gas) piping shall conform to 33 CFR 154.2100(b) [9.12] (N/E).

Compressed air, venting and nitrogen piping and fittings shall conform to ASME B31.3 [9.2] (N).
§ 170.2 High relevance — show source text
Exception 2 to Section 170.2(c)3Bi: The field verification and ECC-Provider data registry requirements of Reference Residential Appendix RA2 and RA3 are not required for multifamily dwelling units in buildings four habitable stories and greater. The installer shall certify that diagnostic testing was performed in accordance with the applicable procedures. ii. Space-conditioning distribution systems. All space-conditioning systems shall meet all applicable requirements of a or b below:

a. High performance attics. Air handlers or ducts are allowed to be in ventilated attic spaces when the roof and ceiling insulation level meet Option B in Table 170.2-A. b. Duct and air handlers located in conditioned space. Duct systems and air handlers of HVAC systems shall be located in conditioned space, and confirmed by field verification and diagnostic testing to meet the criterion of Reference Residential Appendix RA3.1.4.3.8. NOTE: Gas heating appliances installed in conditioned spaces must meet the combustion air requirements of California Mechanical Code Chapter 7, as applicable. iii. Central fan integrated ventilation systems—systems serving individual dwelling units. Central forced air system fans used to provide outside air shall have an air-handling unit fan efficacy less than or equal to the maximum W/cfm specified in a or b below. The airflow rate and fan efficacy requirements in this section shall be confirmed through field verification and diagnostic testing in accordance with all applicable procedures specified in Reference Residential Appendix RA3.3. Central Fan Integrated Ventilation Systems shall be certified to the Energy Commission as Intermittent Ventilation Systems as specified in Reference Residential Appendix RA3.7.4.2.

a. 0.45 W/cfm for gas furnace air-handling units; or b. 0.58 W/cfm for air-handling units that are not gas furnaces. iv. Balanced ventilation systems with heat/energy recovery in Climate Zones 1, 2, 4, 11–14, and 16. A balanced ventilation system with heat or energy recovery shall be used to meet Section 160.2(b)2Aivb1, and shall meet the applicable requirements of Item a or b below: a. In Climate Zones 1, 2, 4, 11–14, and 16, balanced ventilation systems serving individual dwelling units shall:
1. Be an energy recovery ventilator (ERV) or heat recovery ventilator (HRV),
2. Have a minimum sensible recovery efficiency of 67 percent, rated at 32 degrees Fahrenheit (0 degrees Celsius), and
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MULTIFAMILY BUILDINGS—PERFORMANCE AND PRESCRIPTIVE COMPLIANCE APPROACHES
1. Have a fan efficacy less than or equal to 0.6 W per cfm. These measures shall be confirmed through field verification in accordance with the procedures in RA3.7.4.4 for buildings with three habitable stories or fewer, or the procedures in NA2.2.4.1.5 for buildings with four or more habitable stories.
b. In Climate Zones 1, 2, 4, 11–14, and 16, balanced ventilation systems serving multiple dwelling units in buildings with four or more habitable stories shall:
1. Be an ERV or HRV,
§ 180.2 High relevance — show source text
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MULTIFAMILY BUILDINGS—ADDITIONS, ALTERATIONS AND REPAIRS TO EXISTING MULTIFAMILY BUILDINGS

C. If it is not possible to meet the duct sealing requirements of either Section 180.2(b)2AiicI or II then all accessible leaks shall be sealed and verified through a visual inspection and a smoke test by a certified ECC-Rater utilizing the methods specified in Reference Residential Appendix RA3.1.4.3.5.

Exception to Section 180.2(b)2AiiaII: duct sealing. Existing duct systems that are extended, which are constructed, insulated or sealed with asbestos. Exception 1 to 180.2(b)2Aii: The field verification and ECC-Provider data registry requirements of Reference Residential Appendix RA2 and RA3 are not required for multifamily dwelling units in buildings four stories and greater. The installer shall certify that diagnostic testing was performed in accordance with the applicable procedures. iii. Altered space-conditioning system—duct sealing. In all climate zones, when a space-conditioning system serving a multifamily dwelling is altered by the installation or replacement of space-conditioning system equipment, including replacement of the air handler, outdoor condensing unit of a split system air conditioner or heat pump, or cooling or heating coil, the duct system that is connected to the altered space-conditioning system equipment shall be sealed, as confirmed through field verification and diagnostic testing in accordance with the applicable procedures for duct sealing of altered existing duct systems as specified in Reference Residential Appendix RA3.1 and the leakage compliance criteria specified in Subsection a, b or c below. a. The measured duct leakage shall be equal to or less than 15 percent of air handler airflow as determined utilizing the procedures in Reference Residential Appendix Section RA3.1.4.3.1; or b. The measured duct leakage to outside shall be equal to or less than 10 percent of air handler airflow as determined utilizing the procedures in Reference Residential Appendix Section RA3.1.4.3.4; or c. If it is not possible to meet the duct sealing requirements of either Section 180.2(b)2Aiiia or b, then all accessible leaks shall be sealed and verified through a visual inspection and a smoke test by a certified ECC-Rater utilizing the methods specified in Reference Residential Appendix RA3.1.4.3.5. Exception 1 to Section 180.2(b)2Aiii : duct sealing. Duct systems that are documented to have been previously sealed as confirmed through field verification and diagnostic testing in accordance with procedures in Reference Residential Appendix RA3.1. Exception 2 to Section 180.2(b)2Aiii: duct sealing. Duct systems with less than 40 linear feet as determined by visual inspection. Exception 3 to Section 180.2(b)2Aiii: duct sealing. Existing duct systems constructed, insulated or sealed with asbestos.

Exception 4 to Section 180.2(b)2Aiii: The field verification and ECC-Provider data registry requirements of Reference Residential Appendix RA2 and RA3 are not required for multifamily dwelling units in buildings four stories and greater. The installer shall certify that diagnostic testing was performed in accordance with the applicable procedures. iv. **Altered space-conditioning system mechanical cooling.
§ 150.0 Medium relevance — show source text
Entirely new or complete replacement duct systems installed as part of an alteration is constructed of at least 75 percent new duct material, and up to 25 percent may consist of reused parts from the dwelling unit’s existing duct system, including but not limited to registers, grilles, boots, air handler, coil, plenums, duct material; if the reused parts are accessible and can be sealed to prevent leakage. Entirely new or complete replacement duct systems shall also conform to the requirements of Sections 150.0(m)12 and 150.0(m)13. If the air handler and ducts are located within a vented attic, the requirements of Section 150.2(b)1J shall also be met.

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SINGLE-FAMILY RESIDENTIAL BUILDINGS—ADDITIONS AND ALTERATIONS TO EXISTING RESIDENTIAL BUILDINGS

b. Extension of an existing duct system. If the new ducts are an extension of an existing duct system serving single-family dwellings, the combined new and existing duct system shall meet one of the following requirements: I. The measured duct leakage shall be equal to or less than 10 percent of system air handler airflow as confirmed by field verification and diagnostic testing utilizing the procedures in Reference Residential Appendix Section RA3.1.4.3.1; or II. The measured duct leakage to outside shall be equal to or less than 7 percent of system air handler airflow as confirmed by field verification and diagnostic testing utilizing the procedures in Reference Residential Appendix Section RA3.1.4.3.4; or III. If it is not possible to meet the duct sealing requirements of either Section 150.2(b)1DiibI or 150.2(b)1DiibII, then all accessible leaks shall be sealed and verified through a visual inspection and a smoke test by a certified ECC-Rater utilizing the methods specified in Reference Residential Appendix RA3.1.4.3.5. Exception to Section 150.2(b)1Diib: Duct sealing. Existing duct systems that are extended, which are constructed, insulated or sealed with asbestos.

c. Altered ducts and duct system components in garage spaces. When new or replacement space-conditioning ducts, air-handling units, cooling or heating coils, or plenums are located in a garage space, compliance with either I or II below is required. I. The measured system duct leakage shall be less than or equal to 6 percent of system air handler airflow as determined utilizing the procedures in Reference Residential Appendix Section RA3.1.4.3.1; or II. All accessible leaks located in the garage space shall be sealed and verified through a visual inspection and a smoke test by a certified ECC-Rater utilizing the methods specified in Reference Residential Appendix RA3.1.4.3.5. E. Altered space-conditioning system—duct sealing. In all climate zones, when a space-conditioning system serving a single-family dwelling is altered by the installation or replacement of space-conditioning system equipment, including replacement of the air handler, outdoor condensing unit of a split system air conditioner or heat pump, or cooling or heating coil, the duct system that is connected to the altered space-conditioning system equipment shall be sealed, as confirmed through field verification and diagnostic testing in accordance with the applicable procedures for duct sealing of altered existing duct systems as specified in Reference Residential Appendix RA3.1, and the leakage compliance criteria specified in Subsection i, ii, or iii below.
§ 4.3 Medium relevance — show source text
For each phase of the work, define the roles and responsibilities for each member of the Cx team. iii. List the required Cx deliverables, reports, forms and verifications expected at each stage of the commissioning effort.

iv. Include the confirmation process for the O&M manual, systems manual and the facility operator and maintenance staff training.

4.3 Enforcement:

At their discretion, the inspector confirms demonstrated compliance at Plan Intake by: a) Receipt of a copy of the commissioning plan, or b) Receipt of a form signed by the owner or owner’s representative attesting that the Cx Plan has been completed.

Reference: 5 Functional performance testing

CALGreen Section 5.410.2.4, Functional performance testing.

5.1 Intent:

Develop and implement the functional performance tests to document, as set forth in the commissioning plan, that all components, equipment, systems and system-to-system interfaces were installed as specified, and operate according to the Owner’s Project Requirements, Basis of Design, and plans and specifications.

The following systems to be functionally tested are listed in the Basis of Design (Section 5.410.2.2 of the code):
1. Renewable energy systems
2. Landscape irrigation systems
3. Water reuse systems
5.2 Compliance Method:

Compliance is demonstrated by developing and implementing test procedures for each piece of commissioned equipment and interfaces between equipment and systems according to the building-specific commissioning plan. Tests should include verification of proper operation of all equipment features, each part of the sequence of operation, overrides, lockouts, safeties, alarms, occupied and unoccupied modes, loss of normal power, exercising a shutdown, startup, low load through full load (as much as is possible) and back, staging and standby functions, scheduling, energy efficiency strategies and loop tuning.

Elements of acceptable test procedures include:
1. Date and party—Identification of the date of the test and the party conducting the test.
2. Signature block—Signature of the designated commissioning lead and the equipment installing contractor attesting that the recorded test results are accurate.
3. Prerequisites—Any conditions or related equipment checkout or testing that needs to be completed before conducting this test.
4. Precautions—Identification of the risks involved to the test team members and the equipment and how to mitigate them.
5. Instrumentation—Listing of the instrumentation and tools necessary to complete the test.
6. Reference—In each procedure item, identify the source for what is being confirmed (e.g., sequence of operation ID, operating feature, specification requirement, etc.).
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COMPLIANCE FORMS, WORKSHEETS AND REFERENCE MATERIAL
1. Test instructions—Step-by-step instructions of how to complete the test, including functions to test and the conditions under which the tests should performed.
2. Acceptance criteria—Measurable pass / fail criteria for each step of the test, as applicable.
3. Results—Expected system response and space to document the actual response, readings, results and adjustments.
4. Return to normal—Instructions that all systems and equipment are to be returned to their as-found state at the conclusion of the tests.
5. Deficiencies—A list of deficiencies and how they were mitigated.
5.3 Enforcement:

§ 4-3 Medium relevance — show source text

3-Wire Only) 4-3/4” Test Transformer	Col3	Col4	16 3/4”	Col6	-1
Neutral Bus 2-3/4” Bus Support Bar 1‐3/4” Test Transformer Bus Link (3∅, 3-Wire Only) 4-3/4” Customer Cables and Equipment Are Not Allowed in the Compartment
Neutral Bus 2-3/4” Bus Support Bar 1‐3/4” Test Transformer Bus Link (3∅, 3-Wire Only) 4-3/4” Customer Cables and Equipment Are Not Allowed in the Compartment
Neutral Bus 2-3/4” Bus Support Bar 1‐3/4” Test Transformer Bus Link (3∅, 3-Wire Only) 4-3/4” Customer Cables and Equipment Are Not Allowed in the Compartment	1‐3/4”	1‐3/4”
Neutral Bus 2-3/4” Bus Support Bar 1‐3/4” Test Transformer Bus Link (3∅, 3-Wire Only) 4-3/4” Customer Cables and Equipment Are Not Allowed in the Compartment	1‐3/4”	1‐3/4”
Neutral Bus 2-3/4” Bus Support Bar 1‐3/4” Test Transformer Bus Link (3∅, 3-Wire Only) 4-3/4” Customer Cables and Equipment Are Not Allowed in the Compartment	1‐3/4”	1‐3/4”	Mete Typ. Bar See B Drillin Detail Page	Mete Typ. Bar See B Drillin Detail Page	Mete Typ. Bar See B Drillin Detail Page

Support Bar

8” Max.

|3”
Min.
4-3/4”
See
Note C.
11 for Min. 6-7/8”
g Tap
ocations 6-3/4”
See
Note C. 5”
for Min.

§ 2.2 Medium relevance — show source text

A. The installer and rater shall perform the standard charge verification procedure as specified in Reference Residential Appendix Section RA3.2.2, or an approved alternative procedure as specified in Section RA1; or B. The installer shall perform the weigh-in charging procedure as specified by Reference Residential Appendix Section RA3.2.3.1, provided the system is of a type that can be verified using the RA3.2.2 standard charge verification procedure and RA3.3 airflow rate verification procedure or approved alternatives in RA1. The ECC-Rater shall verify the charge using RA3.2.2 and RA3.3 or approved alternatives in RA1. Exception 1 to Section 180.2(b)2AivbII : When the outdoor temperature is less than 55°F and the installer utilizes the weigh-in charging procedure in Reference Residential Appendix Section RA3.2.3.1 to demonstrate compliance, the installer may elect to utilize the verification procedure in Reference Residential Appendix Section RA3.2.3.2. If the verification procedure in Section RA3.2.3.2 is used for compliance, the system's thermostat shall conform to the specifications in Section 110.12. Ducted systems shall comply with the minimum system airflow rate requirements in Section 180.2(b)2AivbI. Exception 2 to Section 180.2(b)2Aivb: The field verification and ECC-Provider data registry requirements of Reference Residential Appendix RA2 and RA3 are not required for multifamily dwelling units in buildings four stories and greater. The installer shall certify that diagnostic testing was performed in accordance with the applicable procedures. v. Altered space-heating system. Altered or replacement space-heating systems shall not use electric resistance as the primary heat source. Exception 1 to Section 180.2(b)2Av: Nonducted electric resistance space heating systems, if the existing space heating system is electric resistance. Exception 2 to Section 180.2(b)2Av: Ducted electric resistance space heating systems, if the existing space heating system is electric resistance and a ducted space cooling system is not being replaced or installed. Exception 3 to Section 180.2(b)2Av: Electric resistance space heating systems, if the existing space heating system is electric resistance in Climate Zone 6, 7, 8 or 15. b. Common use area space-conditioning systems. i. New or replacement space-conditioning systems or components other than new or replacement space-conditioning system ducts shall meet the requirements of Sections 170.2(c)1, 2 and 4, applicable to the systems or components being altered. For compliance with Section 170.2(c)4A, additional fan power adjustment credits are available as specified in Table 180.2-D.

TABLE 180.2-D—FAN POWER LIMITATION PRESSURE DROP ADJUSTMENT	Col2	Col3	Col4	Col5	Col6	Col7
AIRFLOW	MULTI-ZONE VAV SYSTEMS1 ≤ 5,000 cfm	MULTI-ZONE VAV SYSTEMS1 > 5,000 AND ≤ 10,000 cfm	MULTI-ZONE VAV SYSTEMS1 > 10,000 cfm	ALL OTHER FAN SYSTEMS **≤ 5,

§ 3.3 Medium relevance — show source text
1. Definitions section.
3.3 Enforcement:

At their discretion, the inspector confirms demonstrated compliance at Plan Intake by: a) Receipt of a copy of the commissioning specifications, or b) Receipt of a form signed by the owner or owner’s representative or designer of record attesting that the owner-approved commissioning specifications are included in the construction documents.

Reference: 4 Commissioning plan

CALGreen Section 5.410.2.3, Commissioning plan.

4.1 Intent:

The Commissioning Plan (Cx Plan) establishes the commissioning process guideline for the project and commissioning team’s level of effort by identifying the required Cx activities to ensure that the Owner’s Project Requirements (OPR) and the Basis of Design (BOD) are met. The Cx Plan also includes a commissioning schedule from design to occupancy.

4.2 Compliance Method:

Compliance is demonstrated by preparation of a project-specific Cx Plan that includes the elements listed in the code section above. The following gives guidance for developing the components of the commissioning plan:
1. General project information - Provide project-identifying information including but not limited to the following: i. Project name, owner, location. ii. Building type, building area. iii. Project schedule. iv. Contact information of individual/company providing the commissioning services.
2. Commissioning goals – Document the commissioning goals, including but not limited to: i. Meeting CALGreen code requirements for commissioning. ii. Meeting OPR and BOD requirements. iii. Carrying out requirements for commissioning activities as specified in plans and specifications.
3. Systems to be commissioned – See BOD a. An explanation of the original design intent - Document the performance objectives and design intent for each system listed to be commissioned in a written narrative
```
    - Refer to the OPR and BOD documents
```
b. Equipment and systems to be tested, including the extent of tests i. Provide a list of equipment and systems to be tested

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ii. Describe the range and extent of tests to be performed for each system component, and interface between systems c. Functions to be tested - Provide example functional test procedures to identify the level of testing detail required
```
       See (Section 5.410.2.4) FPT guidance for more information
```
d. Conditions under which the test shall be performed - Identify the conditions under which the major operational system functions are to be tested, including: i. Normal operations and part-load operations. ii. Seasonal testing requirements. iii. Restart of equipment and systems after power loss. iv. System alarm confirmations. e. Measurable criteria for acceptable performance - Include measurable criteria for acceptable performance of each system to be tested 4. Commissioning team information - Provide a contact list for all commissioning team members, including but not limited to: i. Owner, owner’s representative. ii. Architect, engineers. iii. Designated commissioning representative. iv. General contractor, subcontractors and construction manager. 5. Commissioning process activities, schedules and responsibilities i. Establish prescribed commissioning process steps and activities to be accomplished by the Cx team throughout the design to occupancy. ii. For each phase of the work, define the roles and responsibilities for each member of the Cx team. iii.
§ 2.3.2 Medium relevance — show source text
If the verification procedure in Section RA3.2.3.2 is used for compliance, the system’s thermostat shall conform to the specifications in Section 110.12. Ducted systems shall comply with the minimum system airflow rate requirement in Section 170.2(c)3BiaII.

b. For air-cooled air conditioners and air-source heat pumps, including but not limited to ducted split systems, ducted packaged systems, small duct high velocity systems and mini-split systems, which are of a type that cannot comply with the requirements of Section 170.2(c)3Bi: I. The installer shall confirm the refrigerant charge using the weigh-in charging procedure specified in Reference Residential Appendix Section RA3.2.3.1, as verified by a ECC-Rater according to the procedures specified in Reference Residential Appendix Section RA3.2.3.2; and II. Systems that utilize forced air ducts shall comply with the minimum system airflow rate requirement in Section 170.2(c)3BiaII, provided the system is of a type that can be verified using the procedures in RA3.3 or an approved alternative procedure in RA1. Exception 1 to Section 170.2(c)3Bi: Packaged systems for which the manufacturer has verified correct system refrigerant charge prior to shipment from the factory are not required to have refrigerant charge confirmed through field verification and diagnostic testing. The installer of these packaged systems shall certify that the packaged system was precharged at the factory and has not been altered in a way that would affect the charge. Ducted systems shall comply with minimum system airflow rate requirement in Section 170.2(c)3Bib, provided that the system is of a type that can be verified using the procedure specified in RA3.3 or an approved alternative in RA1. Exception 2 to Section 170.2(c)3Bi: The field verification and ECC-Provider data registry requirements of Reference Residential Appendix RA2 and RA3 are not required for multifamily dwelling units in buildings four habitable stories and greater. The installer shall certify that diagnostic testing was performed in accordance with the applicable procedures. ii. Space-conditioning distribution systems. All space-conditioning systems shall meet all applicable requirements of a or b below:

a. High performance attics. Air handlers or ducts are allowed to be in ventilated attic spaces when the roof and ceiling insulation level meet Option B in Table 170.2-A. b. Duct and air handlers located in conditioned space. Duct systems and air handlers of HVAC systems shall be located in conditioned space, and confirmed by field verification and diagnostic testing to meet the criterion of Reference Residential Appendix RA3.1.4.3.8. NOTE: Gas heating appliances installed in conditioned spaces must meet the combustion air requirements of California Mechanical Code Chapter 7, as applicable. iii. Central fan integrated ventilation systems—systems serving individual dwelling units. Central forced air system fans used to provide outside air shall have an air-handling unit fan efficacy less than or equal to the maximum W/cfm specified in a or b below. The airflow rate and fan efficacy requirements in this section shall be confirmed through field verification and diagnostic testing in accordance with all applicable procedures specified in Reference Residential Appendix RA3.3. Central Fan Integrated Ventilation Systems shall be certified to the Energy Commission as Intermittent Ventilation Systems as specified in Reference Residential Appendix RA3.7.4.2.

Frequently asked questions

Who must enter test results into the RA2 registry?

When the Part 6 clause requires RA2 registry reporting the ECC‑Provider / ECC‑Rater enters the required test data and metadata; some multifamily exceptions shift responsibility to the installer certification instead .

If my system is pre‑charged at the factory, do I still need RA3 verification?

Entirely new or replacement packaged systems pre‑charged and verified by the manufacturer may be exempt from field charge verification; the installer must certify the unit was pre‑charged and unaltered per the applicable Part 6 exception .

Which RA3 subsection covers duct leakage pass/fail thresholds?

Duct leakage procedures and thresholds for altered and new systems are in RA3.1 (see RA3.1.4.3.1 and RA3.1.4.3.4 referenced in the Part 6 text) .

For tall multifamily (≥4 stories) do I ignore RA3 and RA2?

No. Many Part 6 requirements exempt the RA2 registry and RA3 reporting for units in buildings four habitable stories and greater, but the Part 6 text still requires compliance with performance criteria — often via installer certification or alternate NA procedures for common areas; verify the exact Part 6 clause for that building type .

Where are the refrigerant charge verification procedures?

RA3.2 contains the charge verification procedures (standard charge RA3.2.2 and weigh‑in RA3.2.3.1 with ECC‑Rater verification RA3.2.3.2), which Part 6 cites for refrigerant verification requirements .

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Related in the California Energy Code

When must field verification and diagnostic testing be performed for residential HVAC and ventilation?

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Field verification and diagnostic testing (FVDT) and Reference Appendices

California Energy Code