Manual Zr - Residential Zoning Systems

Manual ZRManual ZR - Residential Zoning Systems [ANSI/ACCA 11 Manual ZR - 2018]

The First Edition of Manual Zr® (Version 1.10) provides procedures and requirements for designing zoned comfort systems for residential buildings, including single-family detached homes, duplex and triplex homes, row and townhouses, and large, multi-family structures that are in accordance and compatible with Manual J procedures (Manual J, Appendix 15.)

The First Edition of Manual Zr® is divided into three normative parts which provide ANSI and ACCA standards and requirements for zoning residential comfort systems. Across seventeen sections are topics such as general zoning information, procedures, calculation tools, and examples relevant to standards and codes.


ANSI/ACCA Requirements
The ANSI/ACCA Standard consists of the following normative sections.

  • Section N1 - General Requirements for Residential Zoned Systems
    Zoning principles and design principles that apply to all types of zoning systems.
  • Section N2 - Requirements for Zone Damper Systems
    Design principles that are peculiar to zone damper systems.
  • Section N3 - Requirements for Ductless Equipment, Unitary Equipment, and Hot Water Heat
    Design principles that are peculiar to zoning per use of unitary equipment.

Informative Material, Part 1 - Zoned System Design
Part 1 helps in understanding zoning issues pertaining to the structure, the equipment, and the occupants.

  • Section 1 - Zoning Benefits
    Summarizes zoning advantages and discusses the appropriate use of the zoning concept.
  • Section 2 - Zoning Methods
    Summarizes the methods and equipment options for residential zoning.
  • Section 3 - Making Zoning Decisions
    Provides instructions for producing a zoning plan.
  • Section 4 - Load Calculations for Zoned Systems
    Explains how Manual J is used for zoning plan decisions.

Informative Material, Part 2 - Zone Damper Systems
Part 2 helps understanding peculiar issues in air zoning.

  • Section 5 - Zone Damper Systems
    Discusses the types of systems, equipment, and components used for air zoning. Discusses technical issues that affect system design.
  • Section 6 - Zone Damper System Design
    Provides instructions for designing various types of zone damper systems.
  • Section 7 - Bypass Path Design
    Bypass duct airway sizing and bypass air control for zone damper systems that have bypass air relief.
  • Section 8 - Managing Excess Air
    Provides methods and calculations for maintaining adequate airflow through the indoor blower and for keeping discharge air temperature in the range specified by the manufacturer of the primary heating-cooling system.

Example Problems for Air Zoning

  • Section 9
    Shows air zoning applied to new construction.
  • Section 10
    Shows air zoning applied to an existing system that is inherently compatible with air zoning concepts and equipment.
  • Section 11
    Shows how an existing system is evaluated and modified for retrofitted air zoning.

Informative Material, Part 3 - Zoning with Multi-Split Equipment
Part 3 helps in understanding the issues of ductless split coil cooling systems and ductless split coil heat pump systems.

  • Section 12 - Ductless Multi-Split Systems
    Summarizes system capabilities and arrangements and equipment attributes and features. Section 12 shows how equipment selection and sizing require conditional (expanded) performance data.
  • Section 13 - Ductless Multi-Split System Example
    Shows how multi-split zoning is applied to new construction (local duct systems are used to match zone loads with indoor unit capacities).

Informative Material, Part 4 - Zoning with Distributed Equipment
Part 4 helps in understanding the issues they apply to a specific piece of equipment per zone concept.

  • Section 14 - Ductless Single-Split Equipment
    Summarizes system capabilities and arrangements, and equipment attributes and features for ductless split equipment that has one indoor coil located (completely or partially) in the space served. 
  • Section 15 - Single Package Equipment 
    Summarizes system capabilities and arrangements, and equipment attributes and features for a complete equipment package that is located (completely or partially) in the space served. This can be a packaged terminal air conditioner, a package terminal heat pump, a window unit, or a through-the-wall unit.
  • Section 16 - Convective and Radiant Heat
    A zoned heating-only system (hot water or electric resistance) can have local convective or fan coil units or a set of radiant heat panels. Manual Zr defers to design information provided by this portion of the industry.
  • Section 17 - Central Chiller and Boiler with Air Handlers
    Avery large home or compound can have central equipment. Which can be a boiler and a small water chiller. Zones are served by local air handlers that have a hot water coil, a chilled water coil, and duct runs. OEM performance data is required for system design.

Commercial equipment selection and sizing procedures apply (see Manual CS).

Informative Material, Part 5 - Advanced Topics
Part 5 provides ten appendices to help expand upon concepts and procedures that are covered in the main body of this manual.

  • Appendix 1 - Causes of Temperature and Comfort Problems
  • Appendix 2 - Moisture and Condensation Issues
  • Appendix 3 - Bypass Duct and Dump Zone Calculations 
  • Appendix 4 - Air Buoyancy Effects
  • Appendix 5 - ECM Motor Programming
  • Appendix 6 - Equipment Selection and Part Load Performance
  • Appendix 7 - Air Distribution for Zone Damper Systems
  • Appendix 8 - Duct System Design
    • Appendix 8 explains how to apply Manual D procedures to duct systems that have zone dampers.
  • Appendix 9 - Balancing Zone Damper Systems
  • Appendix 10 - Multi-Split Piping

Informative Material, Part 6 - Ancillary Information
Part 6 provides summaries, information, glossaries, and definitions that are relevant to topics covered throughout Manual Zr, including but not limited to:

  • Appendix 11 - Condensation Calculations 
  • Appendix 12 - Equipment Capacity at Altitude
  • Appendix 13 - Automatic Bypass Damper Issues
  • Appendix 18 - Worksheets and Defaults

become an acca member

And Get Member Exclusives

learn more

PLUS It's Risk-Free!

Connect with ACCA

Corporate Partners