Energy Efficiency

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

• CBC § 108.1 Medium relevance — show source text

  108.1** Items in this section are necessary to address innovative
  concepts or local environmental conditions.||||||| |Item 1|
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  | |Item 3||||||| |ENERGY EFFICIENCY||||||| |General||||||| |4.201.1 Building meets or exceeds the requirements of the_California_
  _Building Energy Efficiency Standards_3.||2|2|||| |Performance Approach for Newly
  Constructed Buildings||||||| |**A4.203.1.1 Hourly Source Energy Rating (EDR1).**EDR1 ratings for
  building design shall be computed by Energy Compliant software and
  shall reduce the EDR1 required by the software by the compliance
  margins specified in Table A4.203.1.1.||2|2|||| |**A4.203.1.2 Prerequisite options.In addition, a minimum of two of
  the efficiency measures specified in Sections A4.203.1.2.1 through
  A4.203.1.2.8 will be required to be met.
  · Roof Deck Insulation or Ducts in Conditioned Space.
  · High-performance Walls.
  · Compact Hot Water Distribution System.
  · Drain Water Heat Recovery.
  · High Performance Vertical Fenestration.
  · Heat Pump Water Heater Demand Management.
  · Battery Storage System Controls.
  · **Heat Pump Space and Water Heating.||2|2|||| |**A4.203.1.3 Consultation with local electric service provider.**Local
  jurisdictions considering adoption of reduced EDR targets based on
  using solar photovoltaic (PV) systems larger than required by the
  California Energy Code shall consult with the local electric service
  provider to ensure that that PV system sizing required to comply with
  the EDR targets will be acceptable to the local electric service
  provider.||2|2||||

  2025 CALIFORNIA GREEN BUILDING STANDARDS CODE APPENDIX A4-25

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  APPENDIX A4 — RESIDENTIAL VOLUNTARY MEASURES

  SECTION A4.602—RESIDENTIAL OCCUPANCIES APPLICATION CHECKLIST—continued

• CBC § 110.2 Medium relevance — show source text

  
  d.
  For units that operate in both cooling and heating, compliance with both the cooling and heating efficiency is required.
  e.
  For heat recovery heating chilling package applications where there is simultaneous cooling and heating, compliance with the heating performance heat recover COPHR is only
  required at one of the four heating AHRI 550/590 (I-P) standard ratings conditions of Low, Medium, Hot-Water 1 or Hot-Water 2. Compliance with the cooling-only performance
  is required as defined in Notes b and c.
  f.
  Water-to-water heat pumps with a capacity less than 135,000 Btu/h are included in Table 110.2-B, Heat Pumps—Minimum Efficiency Requirements.|a.
  The size category is the full-load net refrigeration cooling mode capacity, which is the capacity of the evaporator available for cooling of the thermal load external to the chill-
  ing package.
  b.
  Cooling rating conditions are standard rating conditions defined in AHRI 550/590 (I-P), Table 4, except for liquid cooled centrifugal chilling packages, which can adjust cooling
  efficiency for nonstandard rating conditions using the_Kadj_ procedure in accordance with Section 110.2(a).
  c.
  For cooling operation, compliance with both the FL and IPLV is required, but only compliance with Path A or Path B cooling efficiency is required.
  d.
  For units that operate in both cooling and heating, compliance with both the cooling and heating efficiency is required.
  e.
  For heat recovery heating chilling package applications where there is simultaneous cooling and heating, compliance with the heating performance heat recover COPHR is only
  required at one of the four heating AHRI 550/590 (I-P) standard ratings conditions of Low, Medium, Hot-Water 1 or Hot-Water 2. Compliance with the cooling-only performance
  is required as defined in Notes b and c.
  f.
  Water-to-water heat pumps with a capacity less than 135,000 Btu/h are included in Table 110.2-B, Heat Pumps—Minimum Efficiency Requirements.|

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  ALL OCCUPANCIES—MANDATORY REQUIREMENTS FOR THE MANUFACTURE, CONSTRUCTION AND INSTALLATION OF SYSTEMS, EQUIPMENT AND BUILDING COMPONENTS

  TABLE 110.2-J—HEAT PUMP AND HEAT RECOVERY CHILLER PACKAGES, HEAT PUMP, HEATING OPERATION—MINIMUM EFFICIENCY REQUIREMENTS	Col2	Col3	Col4	Col5	Col6	Col7
  Equipment Type: Air source	Equipment Type: Air source	Equipment Type: Air source	Equipment Type: Air source	Equipment Type: Air source	Equipment Type: Air source	Equipment Type: Air source
  SIZE CATEGORY REFRIGERATING CAPACITYa, TONR	HEATING SOURCE CONDITIONS (LEAVING LIQUID) OR OAT (db/wb)b,°F	HEAT PUMP HEATING-FULL LOAD HEATING EFFICIENCY **(COPH) c, d, e, f, g, W/W,

• CBC § 201.1 Medium relevance — show source text

  SECTION A4.201—GENERAL

  A4.201.1 Scope. For the purposes of mandatory energy efficiency standards in the California Building Standards Code (Title 24), the California Energy Commission will continue to adopt mandatory standards in the California Energy Code (Title 24, Part 6). It is the intent of these voluntary provisions to encourage local jurisdictions through codification to achieve exemplary performance in the area of building energy efficiency. Local jurisdictions adopting these voluntary provisions as mandatory local energy efficiency standards shall submit the required application and receive the required approval of the California Energy Commission in compliance with Title 24, Part 1, Section 10-106 prior to enforcement. Once the required filing has been verified and finding has been made by the Energy Commission, local jurisdictions shall file an ordinance expressly marking the local modification along with findings and receive the required acceptance from the California Building Standards Commission in compliance with Section 101.7 of this code, prior to enforcement. (Title 24, Part 1, Section 10-106 is available at https://www.energy.ca.gov/programs-and-topics/programs/build- ing-energy-efficiency-standards/2025-building-energy-efficiency

  SECTION A4.202—DEFINITIONS

  A4.202.1 Definitions. The following terms are defined in Chapter 2.

  ENERGY BUDGET.

  LONG-TERM SYSTEM COST (LSC).

  RECOVERED ENERGY, ON-SITE.

  SOLAR POOL HEATING SYSTEM.

  SECTION A4.203—PERFORMANCE APPROACH FOR NEWLY CONSTRUCTED BUILDINGS

  A4.203.1 Energy efficiency. Newly constructed low-rise residential buildings shall comply with Sections A4.203.1.1 through A4.203.1.4.

  A4.203.1.1 Long-term system cost (LSC). LSC rating for the building’s Proposed Design shall be computed by Compliance Software certified by the Energy Commission as specified in Title 24, Part 6, Section 100.1 and 150.1(b), and shall reduce the LSC required in the Compliance Software for minimum performance-based compliance with the California Energy Code by the compliance margin specified in Table A4.203.1.1. The rating shall be included in the Certificate of Compliance documentation.

  TABLE A4.203.1.1—RECOMMENDED LSC MARGINS BY CLIMATE ZONES	Col2
  CALIFORNIA ENERGY CODE CLIMATE ZONE	TOTAL LSC COMPLIANCE MARGIN
  1	2.70
  2	1.62
  3	1.10
  4	1.11
  5	1.01
  6	0.24
  7	0.24
  8	0.21
  9	0.20
  10	0.18
  11	1.11
  12	1.05
  13	0.96
  14	1.21
  15	0.59
  16	1.68
  Note: Community shared options complying with Title 24, Part 1, Section 10-115 may be used to achieve LSC targets.	Note: Community shared options complying with Title 24, Part 1, Section 10-115 may be used to achieve LSC targets.

  2025 CALIFORNIA GREEN BUILDING STANDARDS CODE APPENDIX A4-9

• CBC § 140.4 Medium relevance — show source text

  Exception 1 to Section 140.4(h)3: Cooling towers that are ducted (inlet or discharge) or have an external sound trap that requires external static pressure capability.

  Exception 2 to Section 140.4(h)3: Cooling towers that meet the energy efficiency requirement for propeller fan towers in Section 110.2, Table 110.2-F.

  4. Multiple cell heat rejection equipment. Multiple cell heat rejection equipment with variable speed fan drives shall: A. Operate the maximum number of fans allowed that comply with the manufacturer’s requirements for all system components, and B. Control all operating fans to the same speed. Minimum fan speed shall comply with the minimum allowable speed of the fan drive as specified by the manufacturer’s recommendation. Staging of fans is allowed once the fans are at their minimum operating speed.
  5. Cooling tower efficiency. Axial fan, open-circuit cooling towers serving condenser water loops for chilled water plants with a total of 900 gpm or greater, shall have a minimum rated efficiency based on Table 140.4-H-2 when rated in accordance with the conditions as listed in Table 110.2-F.

  Exception to Section 140.4(h)5: Replacement of existing cooling towers that are inside an existing building or on an exist- ing roof.

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  NONRESIDENTIAL AND HOTEL/MOTEL OCCUPANCIES—PERFORMANCE AND PRESCRIPTIVE

  COMPLIANCE APPROACHES FOR ACHIEVING ENERGY EFFICIENCY

  .

  TABLE 140.4-H-2—MINIMUM EFFICIENCY FOR PROPELLER OR AXIAL FAN OPEN-CIRCUIT COOLING TOWERS (GPM/HP)	Col2	Col3	Col4	Col5	Col6	Col7	Col8	Col9	Col10	Col11	Col12	Col13	Col14	Col15	Col16
  CZ 1	CZ 2	CZ 3	CZ 4	CZ 5	CZ 6	CZ 7	CZ 8	CZ 9	CZ 10	CZ 11	CZ 12	CZ 13	CZ 14	CZ 15	CZ 16
  42.1	70	60	70	70	80	80	80	80	80	60	70	80	60	80	42.1

  (i) Minimum chiller efficiency. Chillers shall meet or exceed Path B from Table 110.2-D.

  Exception 1 to Section 140.4(i): Chillers with electrical service > 600V.

  Exception 2 to Section 140.4(i): Chillers attached to a heat recovery system with a design heat recovery capacity > 40 percent of the design chiller cooling capacity.

  Exception 3 to Section 140.4(i): Chillers used to charge thermal energy storage systems where the charging temperature is < 40°F.

• CBC § 101.4 Medium relevance — show source text

  [A] 101.4 Referenced codes. The other codes specified in Sections 101.4.1 through 101.4.7 and referenced elsewhere in this code shall be considered to be part of the requirements of this code to the prescribed extent of each such reference.

  [A] 101.4.1 Gas. The provisions of the California Plumbing Code and/or the California Mechanical Code shall apply to the installation of gas piping from the point of delivery, gas appliances and related accessories as covered in this code. These requirements apply to gas piping systems extending from the point of delivery to the inlet connections of appliances and the installation and operation of residential and commercial gas appliances and related accessories.

  [A] 101.4.2 Mechanical. The provisions of the California Mechanical Code shall apply to the installation, alterations, repairs and replacement of mechanical systems, including equipment, appliances, fixtures, fittings and appurtenances, including ventilating, heating, cooling, air-conditioning and refrigeration systems, incinerators and other energy-related systems.

  [A] 101.4.3 Plumbing. The provisions of the California Plumbing Code shall apply to the installation, alteration, repair and replacement of plumbing systems, including equipment, appliances, fixtures, fittings and appurtenances, and where connected to a water or sewage system and all aspects of a medical gas system. The provisions of the California Plumbing Code shall apply to private sewage disposal systems.

  [A] 101.4.4 Property maintenance. The provisions of the California Existing Building Code shall apply to existing structures and premises; equipment and facilities; light, ventilation, space heating, sanitation, life and fire safety hazards; responsibilities of owners, operators and occupants; and occupancy of existing premises and structures.

  [A] 101.4.5 Fire prevention. The provisions of the California Fire Code shall apply to matters affecting or relating to structures, processes and premises from the hazard of fire and explosion arising from the storage, handling or use of structures, materials or devices; from conditions hazardous to life, property or public welfare in the occupancy of structures or premises; and from the construction, extension, repair, alteration or removal of fire suppression, automatic sprinkler systems and alarm systems or fire hazards in the structure or on the premises from occupancy or operation.

  [A] 101.4.6 Energy. The provisions of the California Energy Code shall apply to all matters governing the design and construction of buildings for energy efficiency.

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  ADMINISTRATION

  [A] 101.4.7 Existing buildings. The provisions of the California Existing Building Code shall apply to matters governing the repair, alteration, change of occupancy, addition to and relocation of existing buildings.

  [OSHPD 1] The provisions of Chapters 2, 3A, 4A and 5A of the California Existing Building Code shall apply to all matters governing the repairs, alterations, change of occupancy, additions and relocation of existing structures and portions thereof under OSHPD jurisdic- tion. All references to Chapters 3, 4 and 5 of the California Existing Building Code shall be replaced by equivalent provisions in Chapters 3A, 4A and 5A.

• CBC § 101.4.5 Medium relevance — show source text

  [A] 101.4.5 Fire prevention. The provisions of the California Fire Code shall apply to matters affecting or relating to structures, processes and premises from the hazard of fire and explosion arising from the storage, handling or use of structures, materials or devices; from conditions hazardous to life, property or public welfare in the occupancy of structures or premises; and from the construction, extension, repair, alteration or removal of fire suppression, automatic sprinkler systems and alarm systems or fire hazards in the structure or on the premises from occupancy or operation.

  [A] 101.4.6 Energy. The provisions of the California Energy Code shall apply to all matters governing the design and construction of buildings for energy efficiency.

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  ADMINISTRATION

  [A] 101.4.7 Existing buildings. The provisions of the California Existing Building Code shall apply to matters governing the repair, alteration, change of occupancy, addition to and relocation of existing buildings.

  [OSHPD 1] The provisions of Chapters 2, 3A, 4A and 5A of the California Existing Building Code shall apply to all matters governing the repairs, alterations, change of occupancy, additions and relocation of existing structures and portions thereof under OSHPD jurisdic- tion. All references to Chapters 3, 4 and 5 of the California Existing Building Code shall be replaced by equivalent provisions in Chapters 3A, 4A and 5A.

  [OSHPD 1R, 2, 4 & 5] The provisions of the California Existing Building Code, Chapters 2, 3, 4 and 5 shall apply to all matters govern- ing the repairs, alterations, change of occupancy, additions and relocation of existing structures and portions thereof under OSHPD jurisdiction.

  101.4.8 Wildland-urban interface. The provisions of Part 7, the California Wildland-Urban Interface Code shall apply to buildings and structures built in the wildland-urban interface (WUI) or a Fire Hazard Severity Zone.

  SECTION 102—APPLICABILITY

  [A] 102.1 General. Where there is a conflict between a general requirement and a specific requirement, the specific requirement shall be applicable. Where, in any specific case, different sections of this code specify different materials, methods of construction or other requirements, the most restrictive shall govern.

  [A] 102.2 Other laws. The provisions of this code shall not be deemed to nullify any provisions of local, state or federal law.

  [A] 102.3 Application of references. References to chapter or section numbers, or to provisions not specifically identified by number, shall be construed to refer to such chapter, section or provision of this code.

  [A] 102.4 Referenced codes and standards. The codes and standards referenced in this code shall be considered to be part of the requirements of this code to the prescribed extent of each such reference and as further regulated in Sections 102.4.1 through 102.4.4.

  [A] 102.4.1 Conflicts. Where conflicts occur between provisions of this code and referenced codes and standards, the provisions of this code shall apply.

• CBC § 203.1.1.1 Medium relevance — show source text

  2**
  Energy
  Efficiency
  (continued)|Tier 2
  Prerequisite|Energy Performance—outdoor lighting power 90% of Part 6|A5.203.1.1.1||||| |DIVISION 5.2
  Energy
  Efficiency
  (continued)|DIVISION 5.2
  Energy
  Efficiency
  (continued)|Tier 2
  Prerequisite|If applicable, service for water heating in restaurants of 8,000
  sf or greater|A5.203.1.1.2|||||

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  APPENDIX A5 — NONRESIDENTIAL VOLUNTARY MEASURES

  CHAPTER 5 DIVISIONS	Col2	Col3	SECTION TITLE	CODE SECTION	Y	N	O	PLAN SHEET, SPEC OR ATTACH
  (continued) DIVISION 5.2 Energy Efficiency	(continued) DIVISION 5.2 Energy Efficiency	Tier 2 Prerequisite	Energy budget 90% or 85% of Part 6 calculated value of allowance	A5.203.1.2.2
  (continued) DIVISION 5.2 Energy Efficiency	(continued) DIVISION 5.2 Energy Efficiency	Elective	On-site renewable energy (with documentation)	A5.211.1, A5.211.1.1
  (continued) DIVISION 5.2 Energy Efficiency	(continued) DIVISION 5.2 Energy Efficiency	Elective	Green power	A5.211.3
  (continued) DIVISION 5.2 Energy Efficiency	(continued) DIVISION 5.2 Energy Efficiency	Elective	Elevators with car lights and fan	A5.212.1.1, A5.212.1.1.1
  (continued) DIVISION 5.2 Energy Efficiency	(continued) DIVISION 5.2 Energy Efficiency	Elective	Escalators	A5.212.1.2
  (continued) DIVISION 5.2 Energy Efficiency	(continued) DIVISION 5.2 Energy Efficiency	Elective	Controls that reduce energy	_A5.212.1.

• CBC § 110.2 Medium relevance — show source text

  The size category is the full-load net refrigeration cooling mode capacity, which is the capacity of the evaporator available for cooling of the thermal load external to the chill-
  ing package.
  b. For air source heat pumps, compliance with both the 47°F and 17°F heating source outdoor air temperature (OAT) rating efficiency is required for heating.
  c. Heating full-load rating conditions are at standard rating conditions defined in AHRI 550/590 (I-P), Table 4, which includes the impact of defrost for air source heating ratings.
  d. For units that operate in both cooling and heating, compliance with both the cooling and heating efficiency is required.
  e. For heat recovery heating chilling package applications where there is simultaneous cooling and heating, compliance with the heating performance heat recover COPHR is
  only required at one of the four heating AHRI 550/590 (I-P) standard ratings conditions of Low, Medium, Hot-Water 1 or Hot-Water 2. Compliance with the cooling-only perfor-
  mance is required as defined in Notes b and c of Table 110.2-I.
  f. For liquid source heat recovery chilling packages that have capabilities for heat rejection to a heat recovery condenser and a tower condenser, the COPHR applies to operation
  at full load with 100 percent heat recovery (no tower rejection). Units that only have capabilities for partial heat recovery shall meet the requirements of Table 110.2-D, Water
  Chilling Packages—Minimum Efficiency Requirements.
  g. For heat recovery heating chilling package applications where there is simultaneous cooling and heating, compliance with the heating performance heat recover COPHR is
  only required at one of the four heating AHRI 550/590 (I-P) standard ratings conditions of Low, Medium, Hot-Water 1 or Hot-Water 2. Compliance with the cooling-only perfor-
  mance is required as defined in Notes b and c of Table 110.2-I.
  h. Water-to-water heat pumps with a capacity less than 135,000 Btu/h are included in Table 110.2-B, Heat Pumps—Minimum Efficiency Requirements.
  i. Source leaving liquid temperature.
  1. The cooling evaporator liquid flow rate used for the heating rating for a reverse cycle air-to-water heat pump shall be the flow rate determined during the full-load cool-
  ing rating.
  2. The cooling evaporator liquid flow rate for the simultaneous cooling and heating and heat recovery liquid cooled chilling packages rating shall be the liquid flow rates
  from the cooling operation full-load rating.
  3. For heating-only fluid-to-fluid chiller packages, the evaporator flow rate obtained with an entering liquid temperature of 54°F and a leaving liquid temperature of 44°F
  shall be used.
  j. NA means the requirements are not applicable.|a. The size category is the full-load net refrigeration cooling mode capacity, which is the capacity of the evaporator available for cooling of the thermal load external to the chill-
  ing package.
  b. For air source heat pumps, compliance with both the 47°F and 17°F heating source outdoor air temperature (OAT) rating efficiency is required for heating.
  c. Heating full-load rating conditions are at standard rating conditions defined in AHRI 550/590 (I-P), Table 4, which includes the impact of defrost for air source heating ratings.
  d. For units that operate in both cooling and heating, compliance with both the cooling and heating efficiency is required.
  e.

• CBC § 140.4 Medium relevance — show source text

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  NONRESIDENTIAL AND HOTEL/MOTEL OCCUPANCIES—PERFORMANCE AND PRESCRIPTIVE

  COMPLIANCE APPROACHES FOR ACHIEVING ENERGY EFFICIENCY

  7. Hydronic heat pump (WLHP) controls. Hydronic heat pumps connected to a common heat pump water loop with central devices for heat rejection and heat addition shall have controls that are capable of providing a heat pump water supply temperature dead band of at least 20°F between initiation of heat rejection and heat addition by the central devices.

  Exception to Section 140.4(k)7: Where a system loop temperature optimization controller is used to determine the most efficient operating temperature based on real-time conditions of demand and capacity, dead bands of less than 20°F shall be allowed. 8. High capacity space heating gas boiler systems. In Climate Zones 1 through 6, 9 through 14, and 16, gas hot water boiler systems for space heating with a total system input of at least 1 MMBtu/h but no more than 10 MMBtu/h shall meet all of the following requirements. A. Boiler system efficiency. Gas hot water boilers shall have a minimum thermal efficiency of 90 percent. Systems with multiple boilers can meet this requirement if the space-heating input provided by equipment with thermal efficiencies above and below 90 percent has an input capacity-weighted average thermal efficiency of at least 90 percent. For boilers federally regulated by combustion efficiency, the calculation for the input capacity-weighted average thermal efficiency shall use the combustion efficiency value. B. Hot water distribution design. The hot water distribution system shall be designed to comply with Items i and ii. i. Coils and other heat exchangers shall be selected so that at design conditions the hot water return temperature entering the boilers is 120°F or less. ii. Under all operating conditions, the water temperature entering the boiler is 120°F or less or the flow rate of supply hot water that recirculates directly into the return system, such as by three-way valves or minimum flow bypass controls, shall be no greater than 20 percent of the design flow of the operating boilers. Exception 1 to Section 140.4(k)8: Where 25 percent of the annual space heating requirement is provided by on-site renewable energy, site-recovered energy or heat recovery chillers. Exception 2 to Section 140.4(k)8: Space heating boilers installed in individual dwelling units. Exception 3 to Section 140.4(k)8: Where 50 percent or more of the design heating load is served using perimeter convective heating, radiant ceiling panels or both. Exception 4 to Section 140.4(k)8: Individual gas boilers with input capacity less than 300,000 Btu/h shall not be included in the calculations of the total system input or total system efficiency.

  (l) Reserved.

  (m) Fan control. Each cooling system listed in Table 140.4-I shall be designed to vary the indoor fan airflow as a function of load and shall comply with the following requirements:

  1. DX and chilled water cooling systems that control the capacity of the mechanical cooling directly based on occupied space temperature shall A. Have a minimum of two stages of fan control with no more than 66 percent speed when operating on stage 1; and B. Draw no more than 40 percent of the fan power at full fan speed, when operating at 66 percent speed.
• CBC § 203.1.1.1 Medium relevance — show source text

  2**
  Energy
  Efficiency|Tier 1
  Prerequisite|Energy performance—outdoor lighting power 90% of Part 6|A5.203.1.1.1||||| |DIVISION 5.2
  Energy
  Efficiency|DIVISION 5.2
  Energy
  Efficiency|Tier 1
  Prerequisite|If applicable, service for water heating in restaurants of 8,000
  sf or greater|A5.203.1.1.2||||| |DIVISION 5.2
  Energy
  Efficiency|DIVISION 5.2
  Energy
  Efficiency|Tier 1
  Prerequisite|Energy budget 95% or 90% of Part 6 calculated value of
  allowance|A5.203.1.2.1||||| |DIVISION 5.2
  Energy
  Efficiency|DIVISION 5.2
  Energy
  Efficiency|Elective|On-site renewable energy (with documentation)|A5.211.1, A5.211.1.1||||| |DIVISION 5.2
  Energy
  Efficiency|DIVISION 5.2
  Energy
  Efficiency|Elective|Green power|A5.211.3||||| |DIVISION 5.2
  Energy
  Efficiency|DIVISION 5.2
  Energy
  Efficiency|Elective|Elevators with car lights and fan|A5.212.1.1,
  A5.212.1.1.1||||| |DIVISION 5.2
  Energy
  Efficiency|DIVISION 5.2
  Energy
  Efficiency|Elective|Escalators|A5.212.1.2||||| |DIVISION 5.2
  Energy
  Efficiency|DIVISION 5.2
  Energy
  Efficiency|Elective|Controls that reduce energy|A5.212.1.4||||| |DIVISION 5.2
  Energy
  Efficiency|DIVISION 5.2
  Energy
  Efficiency|Elective|Steel framing|A5.213.1|||||

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  APPENDIX A5 — NONRESIDENTIAL VOLUNTARY MEASURES

  CHAPTER 5 DIVISIONS	Col2	Col3	SECTION TITLE	CODE SECTION	Y	N	O	PLAN SHEET, SPEC OR ATTACH
  **DIVISION 5.

• CBC § 25218.5 Medium relevance — show source text

  (d) Alternate method of compliance. Any addition, alteration or repair may comply with the requirements of Title 24, Part 6 by meeting the applicable requirements for the entire building.

  Note: Authority: Sections 25213, 25218, 25218.5, 25402 and 25402.1, Public Resources Code . Reference: Sections 25007, 25008, 25218.5, 25310, 25402, 25402.1, 25402.4, 25402.5, 25402.8, 25910, and 25943, Public Resources Code .

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  NONRESIDENTIAL AND HOTEL/MOTEL OCCUPANCIES— ADDITIONS, ALTERATIONS AND REPAIRS

  SECTION 141.1—REQUIREMENTS FOR COVERED PROCESSES IN ADDITIONS, ALTERATIONS TO EXISTING NONRESIDENTIAL AND HOTEL/MOTEL BUILDINGS

  Covered processes in additions or alterations to existing buildings that will be nonresidential and hotel/motel occupancies shall comply with the applicable Subsections of Section 120.6 and 140.9.

  (a) Lab and Process Facility Exhaust Systems. Additions and alterations to existing laboratories and factories shall meet the requirements of Section 140.9(c).

  (b) Computer Rooms. All newly installed computer room cooling systems and uninterruptible power supply systems in additions/alterations shall meet the requirements of Sections 120.6(j), 140.9(a)2 and 140.9(a)4 and comply with Item 1 below.

  1. Economizers. Each individual cooling system primarily serving computer rooms in an existing building shall include either: A. An integrated air economizer capable of partial cooling when additional mechanical cooling is required and capable of providing 100 percent of the expected system cooling load up to 80°F room supply air temperature at outside air temperatures of 55°F dry-bulb and below or 50°F wet-bulb and below, and be equipped with a fault detection and diagnostic system as specified by Section 120.2(i); or B. An integrated water economizer capable of partial cooling when additional mechanical cooling is required and capable of providing 100 percent of the expected system cooling load up to 80°F room supply air temperature at outside air temperatures of 40°F dry-bulb and below or 35°F wet-bulb and below. Exception 1 to Section 141.1(b)1: Individual computer rooms with an ITE design load under 5 tons (18 kW) in a building that does not have any economizers. Exception 2 to Section 141.1(b)1: New cooling systems serving an existing computer room in an existing building with an ITE design load up to a total of 50 tons (176 kW). Exception 3 to Section 141.1(b)1: New cooling systems serving a new computer room in an existing building with an ITE design load up to a total of 20 tons (70 kW).

  (c) Controlled Environment Horticulture Spaces.

  1. Indoor growing, space-conditioning systems and dehumidification. All newly installed heating, ventilation, air conditioning systems or dehumidification systems in buildings with indoor growing shall meet the applicable requirements of Sections 120.6(h)1 and 120.6(h)2.
• CBC § 110.2 Medium relevance — show source text

  Compliance with the cooling-only perfor-
  mance is required as defined in Notes b and c of Table 110.2-I.
  f. For applications where the chilling package is installed to operate only in heating, compliance only with the heating performance COPH is required at only one of the heating
  AHRI 550/590 (I-P) standard rating conditions of Low, Medium, High, or Boost. Compliance with cooling performance is not required.
  g. For heat pump chilling package applications where the cooling capacity is not being used for conditioning, compliance with the heating performance COPH is only required at
  one of the heating AHRI 550/590 (I-P) standard rating conditions of Low, Medium, High, or Boost. Compliance with the cooling performance is required as defined in Notes b
  and c of Table 110.2-I, except as noted in Note f.
  h. Water-to-water heat pumps with a capacity less than 135,000 Btu/h are included in Table 110.2-B, Heat Pumps—Minimum Efficiency Requirements.
  i. Source leaving liquid temperature.
  1. The cooling evaporator liquid flow rate used for the heating rating for a reverse cycle air-to-water heat pump shall be the flow rate determined during the full load cooling rating.
  2. The cooling evaporator liquid flow rate for the simultaneous cooling and heating and heat recovery liquid cooled chilling packages rating shall be the liquid flow rates
  from the cooling operation full-load rating.
  3. For heating-only fluid-to-fluid chiller packages, the evaporator flow rate obtained with an entering liquid temperature of 54°F and a leaving liquid temperature of 44°F
  shall be used.
  j. NA means the requirements are not applicable.|a. The size category is the full-load net refrigeration cooling mode capacity, which is the capacity of the evaporator available for cooling of the thermal load external to the chill-
  ing package.
  b. For air source heat pumps, compliance with both the 47°F and 17°F heating source outdoor air temperature (OAT) rating efficiency is required for heating.
  c. Heating full-load rating conditions are at standard rating conditions defined in AHRI 550/590 (I-P), Table 4, includes the impact of defrost for air source heating ratings.
  d. For units that operate in both cooling and heating, compliance with both the cooling and heating efficiency is required.
  e. For heat recovery heating chilling package applications where there is simultaneous cooling and heating, compliance with the heating performance heat recover COPHR is
  only required at one of the four heating AHRI 550/590 (I-P) standard ratings conditions of Low, Medium, Hot-Water 1 or Hot-Water 2. Compliance with the cooling-only perfor-
  mance is required as defined in Notes b and c of Table 110.2-I.
  f. For applications where the chilling package is installed to operate only in heating, compliance only with the heating performance COPH is required at only one of the heating
  AHRI 550/590 (I-P) standard rating conditions of Low, Medium, High, or Boost. Compliance with cooling performance is not required.
  g. For heat pump chilling package applications where the cooling capacity is not being used for conditioning, compliance with the heating performance COPH is only required at
  one of the heating AHRI 550/590 (I-P) standard rating conditions of Low, Medium, High, or Boost. Compliance with the cooling performance is required as defined in Notes b
  and c of Table 110.2-I, except as noted in Note f.
  h.