• Codes
  • Features

    Features Overview

    Go to features
    Reference

    Reference.

    A reliable and up-to-date source of codes.
    Research

    Research.

    Rapidly and efficiently calculate project parameters.
    Collaboration

    Collaboration.

    Get everyone on the same page and streamline code research.
    Workflows
    Architects General Contractor Building Official & Plans Examiner Inspectors Owner Subcontractors Code Consultants
  • Pricing
  • Login
  • Sign Up
Sign Up
Login
  • Code Library
  • Features
  • Pricing
  • About
  • Careers
  • Help
  • Contact
  • Terms
  • Privacy
Sign Up
Upgrade to Premium
Code calculators: Code Calculators automatically generates a detailed list of requirements.
REFERENCE
Amendment Styling
Industry-leading search
Suggested code sections
Code diagrams
RESEARCH
Code calculators
Filter by topic
Code compare
Code sheet exports
COLLABORATION
Team projects
Bookmarks
Comments
START 2 WEEK FREE TRIAL
Have an account? Sign in
// CODE SNIPPET

R403.7 Heating and Cooling Equipment (Mandatory)

2017 FBC - Energy Conservation, 6th edition > 4 [RE] Residential Energy Efficiency > R403 Systems > R403.7 Heating and Cooling Equipment (Mandatory)
JUMP TO FULL CODE CHAPTER

R403.7.1 Equipment Sizing

Heating and cooling equipment shall be sized in accordance with ACCA Manual S based on the equipment loads calculated in accordance with ACCA Manual J or other approved heating and cooling calculation methodologies, based on building loads for the directional orientation of the building. The manufacturer and model number of the outdoor and indoor units (if split system) shall be submitted along with the sensible and total cooling capacities at the design conditions described in Section R302.1. This Code does not allow designer safety factors, provisions for future expansion or other factors that affect equipment sizing. System sizing calculations shall not include loads created by local intermittent mechanical ventilation such as standard kitchen and bathroom exhaust systems. New or replacement heating and cooling equipment shall have an efficiency rating equal to or greater than the minimum required by federal law for the geographic location where the equipment is installed.

R403.7.1.1 Cooling Equipment Capacity

Cooling only equipment shall be selected so that its total capacity is not less than the calculated total load but not more than 1.15 times greater than the total load calculated according to the procedure selected in Section 403.7, or the closest available size provided by the manufacturer's product lines. The corresponding latent capacity of the equipment shall not be less than the calculated latent load.

The published value for AHRI total capacity is a nominal, rating-test value and shall not be used for equipment sizing. Manufacturer's expanded performance data shall be used to select cooling-only equipment. This selection shall be based on the outdoor design dry-bulb temperature for the load calculation (or entering water temperature for water-source equipment), the blower CFM provided by the expanded performance data, the design value for entering wet-bulb temperature and the design value for entering dry-bulb temperature.

Design values for entering wet-bulb and dry-bulb temperatures shall be for the indoor dry bulb and relative humidity used for the load calculation and shall be adjusted for return side gains if the return duct(s) is installed in an unconditioned space.

Exceptions:

  1. Attached single- and multiple-family residential equipment sizing may be selected so that its cooling capacity is less than the calculated total sensible load but not less than 80 percent of that load.
  2. When signed and sealed by a Florida-registered engineer, in attached single- and multiple-family units, the capacity of equipment may be sized in accordance with good design practice.

R403.7.1.2 Heating Equipment Capacity

R403.7.1.2.1 Heat Pumps

Heat pump sizing shall be based on the cooling requirements as calculated according to Section R403.7.1.1, and the heat pump total cooling capacity shall not be more than 1.15 times greater than the design cooling load even if the design heating load is 1.15 times greater than the design cooling load.

R403.7.1.2.2 Electric Resistance Furnaces

Electric resistance furnaces shall be sized within 4 kW of the design requirements calculated according to the procedure selected in Section R403.7.1.

R403.7.1.2.3 Fossil Fuel Heating Equipment

The capacity of fossil fuel heating equipment with natural draft atmospheric burners shall not be less than the design load calculated in accordance with Section R403.7.1.

R403.7.1.3 Extra Capacity Required for Special Occasions

Residences requiring excess cooling or heating equipment capacity on an intermittent basis, such as anticipated additional loads caused by major entertainment events, shall have equipment sized or controlled to prevent continuous space cooling or heating within that space by one or more of the following options:

  1. A separate cooling or heating system is utilized to provide cooling or heating to the major entertainment areas.
  2. A variable capacity system sized for optimum performance during base load periods is utilized.

Related Code Sections


R403.6 [RE] Residential Energy Efficiency, Heating and Cooling Equipment (Mandatory)
Heating and cooling equipment shall be sized in accordance with ACCA Manual S based on the equipment loads calculated in accordance with ACCA Manual ...
2014 FBC - Energy Conservation, 5th edition > 4 [RE] Residential Energy Efficiency > R403 Systems > R403.6 Heating and Cooling Equipment (Mandatory)
R403.7 [RE] Residential Energy Efficiency, Heating and Cooling Equipment (Mandatory)
Heating and cooling equipment shall be sized in accordance with ACCA Manual S based on the equipment loads calculated in accordance with ACCA Manual ...
2017 FBC - Energy Conservation, 6th edition > 4 [RE] Residential Energy Efficiency > R403 Systems > R403.7 Heating and Cooling Equipment (Mandatory)
R403.7.1.1 [RE] Residential Energy Efficiency, Cooling Equipment Capacity
Cooling only equipment shall be selected so that its total capacity is not less than the calculated total load but not more than 1.15 times greater ...
2017 FBC - Energy Conservation, 6th edition > 4 [RE] Residential Energy Efficiency > R403 Systems > R403.7 Heating and Cooling Equipment (Mandatory) > R403.7.1 Equipment Sizing > R403.7.1.1 Cooling Equipment Capacity
R403.6.1.3 [RE] Residential Energy Efficiency, Extra Capacity Required for Special Occasions
Residences requiring excess cooling or heating equipment capacity on an intermittent basis, such as anticipated additional loads caused by major ...
2014 FBC - Energy Conservation, 5th edition > 4 [RE] Residential Energy Efficiency > R403 Systems > R403.6 Heating and Cooling Equipment (Mandatory) > R403.6.1 Equipment Sizing > R403.6.1.3 Extra Capacity Required for Special Occasions
R403.7.1.3 [RE] Residential Energy Efficiency, Extra Capacity Required for Special Occasions
Residences requiring excess cooling or heating equipment capacity on an intermittent basis, such as anticipated additional loads caused by major ...
2017 FBC - Energy Conservation, 6th edition > 4 [RE] Residential Energy Efficiency > R403 Systems > R403.7 Heating and Cooling Equipment (Mandatory) > R403.7.1 Equipment Sizing > R403.7.1.3 Extra Capacity Required for Special Occasions
Help Contact Us Privacy Terms
Code Calculators
Code Calculators
Code calculators automatically generate a detailed list of requirements.
Shared projects
Shared projects
Projects provide a dedicated space to collaborate on code research.
Code diagrams
Code diagrams
Unpack the code through illustrations and descriptions.
Code Compare
Code Compare
Highlight differences between any two building codes.
Code sheet exports
Code sheet exports
Generate a code sheet that integrates with your drawing set.
View thousands of relevant UL Certified products and assemblies that help achieve code compliance
View thousands of relevant UL Certified products and assemblies that help achieve code compliance
Access to UL product and system certification information.
Search
Search
Don't miss relevant code. Quickly locate sections across your jurisdiction.
UpCodes Premium
Leverage the most sophisticated code compliance platform.
TRY FREE FOR TWO WEEKS VISIT PRICING
Join the waitlist
We are looking to gauge the level of interest in linking UL product and system certification information alongside related code sections.

Let us know your email and we’ll ping you once it’s ready! Learn more.

Thank you for your interest!

If you’re open to it, we would love to jump on the phone to make sure we’re building this in the best way possible for your workflow. Any insight or advice would be greatly appreciated. We’ve sent you an email with a calendar link to book at time with us.


Cancel
Get Early Access
UpCodes Premium
Leverage the full code compliance platform.
START 2 WEEK FREE TRIAL LEARN MORE