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Draft PDS-01, RESNET/ICC 380-2022 Addendum B-202x, CFIS Systems

COMMENT PERIOD EXTENDED TO DECEMBER 12, 2023.

RESNET/ICC 380-2022 Addendum B-202x amends RESNET/ICC 380-2022 concurrent with the RESNET/ICC 301-2022 Addendum E 202x amendments to Standard 301-2022 to maintain consistency and implement the improvement of CFIS systems modeling. The two addenda should be reviewed together.

Proposed Addendum RESNET/ICC 301-2022 Addendum E-202x amends the 2022 edition of Standard 301 to modify the criteria for modeling the performance of Central Fan Integrated Supply Systems (CFIS Systems). The amendments were developed through RESNET’s ongoing rating software consistency initiative and are intended to improve CFIS systems modeling for energy ratings. Improvement of CFIS systems modeling also requires adjustments to data collection and testing. Standard ANSI/RESNET/ICC 380-2022 is being amended to revise its respective requirements.

Draft PDS-01 of RESNET/ICC 380-2022 Addendum D-202x is submitted for public comment for 45 days, beginning October 13, 2023, and ending December 12, 2023. Only the changes shown in draft PDS-01 by strike-through and underline and red print are open for comment.

To review the draft addendum click on Draft PDS-01, RESNET/ICC 380-2022 Addendum B-202x

To submit your comments, click on “SUBMIT COMMENTS HERE” below.

Comments are posted in real time and you will be able to review comments by clicking on “VIEW COMMENTS HERE” below.

The public comment period opens October 13.

Entry Date: November 22, 2023 at 10:23 AM

Full Name: Mike Moore

Affiliation: Stator LLC, representing Broan-NuTone

Address: 531 Deckawoo Dr. Loveland, Colorado 80537

Phone Number: 3034087000

Email: mmoore@statorllc.com

Page Number: multiple

Section/Table/Figure Number: d4e

Comment Intent: Objection

Comment Type: Technical

Comment:

This suggested modification for the definition of CFIS System would clarify that a ventilation system that is integrated with the heating or cooling system’s ductwork but that does not rely on the heating or cooling system’s blower to introduce outdoor air would not be considered a CFIS System.

The phrase, “operational control mode,” aligns with 301 and differentiates between a coincidental operational mode and an intentional operational mode.

The edits to Section 6.1.6.3 and the headers inserted for Sections 6.1.7.1 – 6.1.7.4 are intended to assist with mapping the operational control modes to the sections that follow.

The phrase, “as applicable,” in 6.1.7 is meant to clarify that the operational control modes to be tested are the applicable modes identified in Section 6.1.6.3, not simply any mode selected by the user.

 

Proposed Change to Amendment:

Central Fan Integrated Supply System (CFIS System) – A Blower Fan of a Forced-Air HVAC System with a return-side outdoor air intake duct that supplies outdoor air to the Dwelling Unit[1].  Such systems exclude additional Ventilation fans unless the operation of those fans is coordinated with the Blower Fan through a common control.

…

6.1.6.3 Test and record the outdoor air ventilation flowrates for each fan for all the following operational control modes used by the CFIS System, per Section 6.1.7:  Blower Fan alone (6.1.7.2), supplemental fan alone (6.1.7.3), and Blower Fan plus with supplemental fan (6.1.7.4), supplemental fan alone.

6.1.7. Local mechanical exhaust, Dwelling Unit Mechanical Ventilation System fan, and Forced-Air HVAC System Blower Fan. Non-CFIS Systems shall use section 6.1.7.1. CFIS Systems shall use section 6.1.7.2, 6.1.7.3, and / or 6.1.7.4, as applicable.

6.1.7.1. Non-CFIS System Fan. The fan of the local mechanical exhaust system or Dwelling Unit Mechanical Ventilation System under test shall be turned on. The Forced-Air HVAC System controls shall be adjusted so that the Blower Fan does not operate during the test.

6.1.7.2. Blower Fan Alone. For a CFIS System with an operational control mode using only the primary Blower Fan, the Forced-Air HVAC System controls shall be adjusted to “Fan” mode so that the primary Blower Fan operates during the test.

6.1.7.3 Supplemental Fan Alone. For a CFIS System with an operational control mode using a supplemental ventilation fan separate from the primary Blower Fan, the supplemental ventilation fan under test shall be turned on and the Forced-Air HVAC System controls shall be adjusted so that the Blower Fan does not operate during the test.

6.1.7.4 Blower Fan with Supplemental Fan. For a CFIS System with an operational control mode using both the primary Blower Fan and a supplemental ventilation fan, the Forced-Air HVAC System controls shall be adjusted to “Fan” mode so that the primary Blower Fan operates during the test, the supplemental ventilation fan under test shall be turned on, and outdoor air flow rates for both fans shall be measured with both fans operating.

 

Entry Date: November 28, 2023 at 9:41 AM

Full Name: Connor Dillon

Affiliation: Building Science Institute, Ltd. Co.

Address: 531 W. Court 406G Geronimo, Texas 78115

Phone Number: 4238385171

Email: connor@buildingscienceinstitute.org

Page Number: 1

Section/Table/Figure Number:

Comment Intent: Not an Objection

Comment Type: General

Comment:

It is unfortunate that it has taken this long to clarify that CFIS are not sufficient whole house mechanical ventilation solutions. I support the modified language, but I’m worried for the many homes which were registered and certified for energy code and above-code programs like ENERGY STAR.

I propose RESNET Staff use their Registry data to review the impact, and whether people were actually modeling CFIS appropriately in compliance with ANSI 301.

Proposed Change to Amendment:

Tips and Reminders for Submitting Public Comments 

  • Comments must pertain to text in draft PDS-01 that is shown as either strikethrough or underlined and red print. Comments on portions of draft PDS-01 where no change is indicated will be rejected.
  • Comments should include a specific proposed change to the text of the draft open for comment. Proposed added text must be underlined and text proposed to be removed must be shown using strike-through. If not submitted in this format, the public comment may be rejected.
  • Do not submit comments on standards other than this one that is out for public comment.
  • If you submit public comment representing the collective interests of a group of stakeholders, you are encouraged to submit ONE public comment and identify all stakeholders in that comment. While not required, this expedites the ability of the committees to respond to commenters in a timely manner.
  • Public comments are reviewed by committees with volunteer members, that are Raters, Providers, Software Developers and other industry and public interest stakeholders. They are not reviewed by RESNET® Staff.
  • Most amendments to RESNET® standards are proposed by industry and public stakeholders not RESNET®. To learn more about submitting proposed amendments visit this page: https://www.resnet.us/about/standards/submit-proposed-amendments/