ADOPTS WITH AMENDMENTS:

International Energy Conservation Code 2018 (IECC 2018)

IECC — Commercial Provisions

IECC — Residential Provisions

Heads up: There are no amended sections in this chapter.

User note:

About this chapter: Chapter 4 presents the paths and options for compliance with the energy efficiency provisions. Chapter 4 contains energy efficiency provisions for the building envelope, fenestration, mechanical systems, appliances, freezers and coolers, kitchen exhaust, interior and exterior lighting, water heating systems, transformers and motors.

C401.1 Scope

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The requirements contained in this chapter shall be applicable to commercial buildings, or portions thereof. These commercial buildings shall meet the ASHRAE Standard 90.1, Energy Standard for Buildings Except for Low-Rise Residential Buildings.

C401.2 Application

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C401.2 Amendments

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The following amendments shall apply to ASHRAE 90.1:
  1. Chapter 8, Power, shall be considered optional.

C401.2.1 Application to Replacement Fenestration Products

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Section C402 Building Envelope Requirements

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C402.1 General (Prescriptive)

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C402.1.1 Low-Energy Buildings

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C402.1.2 Equipment Buildings

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C402.1.3 Insulation Component R-Value-Based Method

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C402.1.4 Assembly U-factor, C-Factor or F-Factor-Based Method

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C402.1.4.1 Thermal Resistance of Cold-Formed Steel Walls

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C402.1.5 Component Performance Alternative

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C402.2 Specific Building Thermal Envelope Insulation Requirements (Prescriptive)

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C402.2.1 Roof Assembly

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C402.2.1.1 Skylight Curbs

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C402.2.2 Above-Grade Walls

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C402.2.3 Floors

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C402.2.4 Slabs-On-Grade Perimeter Insulation

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C402.2.5 Below-Grade Walls

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C402.2.6 Insulation of Radiant Heating Systems

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C402.2.7 Airspaces

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C402.3 Roof Solar Reflectance and Thermal Emittance

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C402.3.1 Aged Roof Solar Reflectance

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C402.4 Fenestration (Prescriptive)

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C402.4.1 Maximum Area

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C402.4.1.1 Increased Vertical Fenestration Area With Daylight Responsive Controls

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C402.4.1.2 Increased Skylight Area With Daylight Responsive Controls

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C402.4.2 Minimum Skylight Fenestration Area

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C402.4.2.1 Lighting Controls in Toplit Daylight Zones

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C402.4.2.2 Haze Factor

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C402.4.3 Maximum U-factor and SHGC

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C402.4.3.1 Increased Skylight SHGC

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C402.4.3.2 Increased Skylight U-factor

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C402.4.3.3 Dynamic Glazing

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C402.4.3.4 Area-Weighted U-factor

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C402.4.4 Daylight Zones

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C402.4.5 Doors

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C402.5 Air Leakage—Thermal Envelope (Mandatory)

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C402.5.1 Air Barriers

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C402.5.1.1 Air Barrier Construction

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C402.5.1.2 Air Barrier Compliance Options

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C402.5.1.2.1 Materials

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C402.5.1.2.2 Assemblies

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C402.5.2 Air Leakage of Fenestration

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C402.5.3 Rooms Containing Fuel-Burning Appliances

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C402.5.4 Doors and Access Openings to Shafts, Chutes, Stairways and Elevator Lobbies

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C402.5.5 Air Intakes, Exhaust Openings, Stairways and Shafts

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C402.5.6 Loading Dock Weatherseals

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C402.5.7 Vestibules

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C402.5.8 Recessed Lighting

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Section C403 Building Mechanical Systems

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C403.1 General

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C403.1.1 Calculation of Heating and Cooling Loads

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C403.2 System Design (Mandatory)

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C403.2.1 Zone Isolation Required (Mandatory)

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C403.2.2 Ventilation (Mandatory)

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C403.3 Heating and Cooling Equipment Efficiencies (Mandatory)

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C403.3.1 Equipment Sizing (Mandatory)

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C403.3.2 HVAC Equipment Performance Requirements (Mandatory)

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C403.3.2.1 Water-Cooled Centrifugal Chilling Packages (Mandatory)

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C403.3.2.2 Positive Displacement (Air- And Water-Cooled) Chilling Packages (Mandatory)

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C403.3.3 Hot Gas Bypass Limitation

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C403.3.4 Boiler Turndown

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C403.4 Heating and Cooling System Controls (Mandatory)

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C403.4.1 Thermostatic Controls (Mandatory)

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C403.4.1.1 Heat Pump Supplementary Heat (Mandatory)

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C403.4.1.2 Deadband (Mandatory)

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C403.4.1.3 Setpoint Overlap Restriction (Mandatory)

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C403.4.1.4 Heated or Cooled Vestibules (Mandatory)

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C403.4.1.5 Hot Water Boiler Outdoor Temperature Setback Control (Mandatory)

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C403.4.2 Off-Hour Controls (Mandatory)

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C403.4.2.1 Thermostatic Setback (Mandatory)

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C403.4.2.2 Automatic Setback and Shutdown (Mandatory)

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C403.4.2.3 Automatic Start (Mandatory)

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C403.4.3 Hydronic Systems Controls

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C403.4.3.1 Three-Pipe System

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C403.4.3.2 Two-Pipe Changeover System

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C403.4.3.3 Hydronic (Water Loop) Heat Pump Systems

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C403.4.3.3.1 Temperature Deadband

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C403.4.3.3.2 Heat Rejection

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C403.4.3.3.3 Two-Position Valve

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C403.4.4 Part-Load Controls

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C403.4.5 Pump Isolation

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C403.5 Economizers (Prescriptive)

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C403.5.1 Integrated Economizer Control

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C403.5.2 Economizer Heating System Impact

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C403.5.3 Air Economizers

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C403.5.3.1 Design Capacity

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C403.5.3.2 Control Signal

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C403.5.3.3 High-Limit Shutoff

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C403.5.3.4 Relief of Excess Outdoor Air

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C403.5.3.5 Economizer Dampers

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C403.5.4 Water-Side Economizers

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C403.5.4.1 Design Capacity

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C403.5.4.2 Maximum Pressure Drop

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C403.5.5 Economizer Fault Detection and Diagnostics (Mandatory)

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C403.6 Requirements for Mechanical Systems Serving Multiple Zones

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C403.6.1 Variable Air Volume and Multiple-Zone Systems

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C403.6.2 Single-Duct VAV Systems, Terminal Devices

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C403.6.3 Dual-Duct and Mixing VAV Systems, Terminal Devices

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C403.6.4 Single-Fan Dual-Duct and Mixing VAV Systems, Economizers

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C403.6.5 Supply-Air Temperature Reset Controls

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C403.6.6 Multiple-Zone VAV System Ventilation Optimization Control

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C403.6.7 Parallel-Flow Fan-Powered VAV Air Terminal Control

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C403.6.8 Setpoints for Direct Digital Control

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C403.6.9 Static Pressure Sensor Location

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C403.7 Ventilation and Exhaust Systems (Mandatory)

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C403.7.1 Demand Control Ventilation (Mandatory)

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C403.7.2 Enclosed Parking Garage Ventilation Controls (Mandatory)

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C403.7.3 Ventilation Air Heating Control (Mandatory)

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C403.7.4 Energy Recovery Ventilation Systems (Mandatory)

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C403.7.5 Kitchen Exhaust Systems (Mandatory)

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C403.7.6 Automatic Control of HVAC Systems Serving Guestrooms (Mandatory)

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C403.7.6.1 Temperature Setpoint Controls

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C403.7.6.2 Ventilation Controls

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C403.7.7 Shutoff Dampers (Mandatory)

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C403.8 Fans and Fan Controls

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C403.8.1 Allowable Fan Horsepower (Mandatory)

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C403.8.2 Motor Nameplate Horsepower (Mandatory)

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C403.8.3 Fan Efficiency (Mandatory)

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C403.8.4 Fractional HP Fan Motors (Mandatory)

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C403.8.5 Fan Control

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C403.8.5.1 Fan Airflow Control

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C403.9 Heat Rejection Equipment

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C403.9.1 Fan Speed Control

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C403.9.2 Multiple-Cell Heat Rejection Equipment

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C403.9.3 Limitation on Centrifugal Fan Open-Circuit Cooling Towers

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C403.9.4 Tower Flow Turndown

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C403.9.5 Heat Recovery for Service Water Heating

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C403.10 Refrigeration Equipment Performance

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C403.10.2 Walk-In Coolers and Walk-In Freezers (Mandatory)

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C403.10.2.1 Performance Standards (Mandatory)

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C403.10.3 Refrigerated Display Cases (Mandatory)

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C403.10.4 Refrigeration Systems

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C403.10.4.1 Condensers Serving Refrigeration Systems

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C403.10.4.2 Compressor Systems

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C403.11 Construction of HVAC System Elements (Mandatory)

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C403.11.1 Duct and Plenum Insulation and Sealing (Mandatory)

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C403.11.2 Duct Construction (Mandatory)

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C403.11.2.1 Low-Pressure Duct Systems (Mandatory)

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C403.11.2.2 Medium-Pressure Duct Systems (Mandatory)

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C403.11.2.3 High-Pressure Duct Systems (Mandatory)

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C403.11.3 Piping Insulation (Mandatory)

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C403.11.3.1 Protection of Piping Insulation (Mandatory)

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C403.12 Mechanical Systems Located Outside of the Building Thermal Envelope (Mandatory)

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C403.12.1 Heating Outside a Building

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C403.12.2 Snow- And Ice-Melt System Controls

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C403.12.3 Freeze Protection System Controls

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Section C404 Service Water Heating (Mandatory)

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C404.1 General

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C404.2 Service Water-Heating Equipment Performance Efficiency

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C404.2.1 High Input Service Water-Heating Systems

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C404.3 Heat Traps for Hot Water Storage Tanks

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C404.4 Insulation of Piping

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C404.5 Heated Water Supply Piping

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C404.5.1 Maximum Allowable Pipe Length Method

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C404.5.2 Maximum Allowable Pipe Volume Method

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C404.5.2.1 Water Volume Determination

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C404.6 Heated-Water Circulating and Temperature Maintenance Systems

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C404.6.1 Circulation Systems

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C404.6.2 Heat Trace Systems

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C404.6.3 Controls for Hot Water Storage

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C404.7 Demand Recirculation Controls

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C404.8 Drain Water Heat Recovery Units

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C404.9 Energy Consumption of Pools and Permanent Spas (Mandatory)

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C404.9.1 Heaters

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C404.9.2 Time Switches

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C404.9.3 Covers

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C404.10 Energy Consumption of Portable Spas (Mandatory)

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Section C405 Electrical Power and Lighting Systems

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C405.1 General (Mandatory)

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C405.2 Lighting Controls (Mandatory)

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C405.2.1 Occupant Sensor Controls

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C405.2.1.1 Occupant Sensor Control Function

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C405.2.1.2 Occupant Sensor Control Function in Warehouses

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C405.2.1.3 Occupant Sensor Control Function in Open Plan Office Areas

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C405.2.2 Time-Switch Controls

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C405.2.2.1 Time-Switch Control Function

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C405.2.2.2 Light-Reduction Controls

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C405.2.3 Daylight-Responsive Controls

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C405.2.3.1 Daylight-Responsive Control Function

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C405.2.3.2 Sidelit Zone

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C405.2.3.3 Toplit Zone

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C405.2.4 Specific Application Controls

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C405.2.5 Manual Controls

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C405.2.6 Exterior Lighting Controls

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C405.2.6.1 Daylight Shutoff

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C405.2.6.2 Decorative Lighting Shutoff

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C405.2.6.3 Lighting Setback

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C405.2.6.4 Exterior Time-Switch Control Function

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C405.3 Interior Lighting Power Requirements (Prescriptive)

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C405.3.1 Total Connected Interior Lighting Power

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C405.3.2 Interior Lighting Power Allowance

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C405.3.2.1 Building Area Method

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C405.3.2.2 Space-By-Space Method

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C405.3.2.2.1 Additional Interior Lighting Power

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C405.4 Exterior Lighting Power Requirements (Mandatory)

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C405.4.1 Total Connected Exterior Building Exterior Lighting Power

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C405.4.2 Exterior Lighting Power Allowance

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C405.4.2.1 Additional Exterior Lighting Power

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C405.4.3 Gas Lighting (Mandatory)

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C405.5 Dwelling Electrical Meter (Mandatory)

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C405.6 Electrical Transformers (Mandatory)

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C405.7 Electric Motors (Mandatory)

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C405.8 Vertical and Horizontal Transportation Systems and Equipment

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C405.8.1 Elevator Cabs

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C405.8.2 Escalators and Moving Walks

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C405.8.2.1 Regenerative Drive

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C405.9 Voltage Drop in Feeders and Branch Circuits

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Section C406 Additional Efficiency Package Options

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C406.1 Requirements

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C406.1.1 Tenant Spaces

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C406.2 More Efficient HVAC Equipment Performance

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C406.3 Reduced Lighting Power

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C406.4 Enhanced Digital Lighting Controls

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C406.5 On-Site Renewable Energy

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C406.6 Dedicated Outdoor Air System

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C406.7 Reduced Energy Use in Service Water Heating

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C406.7.1 Load Fraction

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C406.8 Enhanced Envelope Performance

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C406.9 Reduced Air Infiltration

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Section C407 Total Building Performance

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C407.1 Scope

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C407.2 Mandatory Requirements

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C407.3 Performance-Based Compliance

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C407.4 Documentation

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C407.4.1 Compliance Report

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C407.4.2 Additional Documentation

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C407.5 Calculation Procedure

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C407.5.1 Building Specifications

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C407.5.2 Thermal Blocks

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C407.5.2.1 HVAC Zones Designed

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C407.5.2.2 HVAC Zones Not Designed

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C407.5.2.3 Group R-2 Occupancy Buildings

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C407.6 Calculation Software Tools

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C407.6.1 Specific Approval

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C407.6.2 Input Values

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C407.6.3 Exceptional Calculation Methods

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Section C408 Maintenance Information and System Commissioning

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C408.1 General

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C408.1.1 Building Operations and Maintenance Information

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C408.2 Mechanical Systems and Service Water-Heating Systems Commissioning and Completion Requirements

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C408.2.1 Commissioning Plan

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C408.2.2 Systems Adjusting and Balancing

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C408.2.2.1 Air Systems Balancing

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C408.2.2.2 Hydronic Systems Balancing

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C408.2.3 Functional Performance Testing

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C408.2.3.1 Equipment

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C408.2.3.2 Controls

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C408.2.3.3 Economizers

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C408.2.4 Preliminary Commissioning Report

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C408.2.4.1 Acceptance of Report

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C408.2.4.2 Copy of Report

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C408.2.5 Documentation Requirements

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C408.2.5.1 System Balancing Report

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C408.2.5.2 Final Commissioning Report

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C408.3 Functional Testing of Lighting Controls

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C408.3.1 Functional Testing

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C408.3.1.1 Occupant Sensor Controls

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C408.3.1.2 Time-Switch Controls

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C408.3.1.3 Daylight Responsive Controls

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C408.3.2 Documentation Requirements

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C408.3.2.1 Drawings

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C408.3.2.2 Manuals

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C408.3.2.3 Report

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