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Welcome

Welcome. Duct Testing Requirements for HVAC System Change-outs. This program is funded by California utility customers and administered by Pacific Gas and Electric Company, under the auspices of the California Public Utilities Commission. www.pge.com/stockton. Douglas Beaman.

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Welcome

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  1. Welcome Duct Testing Requirements forHVAC System Change-outs

  2. This program is funded by California utility customers and administered by Pacific Gas and Electric Company, under the auspices of the California Public Utilities Commission.

  3. www.pge.com/stockton

  4. Douglas Beaman Douglas Beaman Associates 612 – 13th Street Modesto, CA 95354 (209) 524-1000 Gary@DougBeaman.com

  5. CEC Website New Standards and Manuals can be downloaded at www.energy.ca.gov/title24

  6. Blueprint is a newsletter of the California Energy Commission. It focuses on California's Title 24 Building Efficiency Standards.

  7. Download or subscribe at: http://www.energy.ca.gov/efficiency/blueprint/

  8. How-To Videos California Energy Commission videos http://www.consumerenergycenter.com/videos/

  9. Why Change-Outs? Energy Standards are starting to address energy efficiency of existing homes and businesses as well as new buildings.

  10. Duct Testing 1. Residential New Construction 2. NonResidential New Construction 3. Residential HVAC System Change-outs (in some climate zones) 4. NonResidential HVAC Change-outs (in all climate zones)

  11. Typical Leakage Rates for Residential Systems Statewide average duct leakage in existing residential systems: 28 - 35% 3-ton @ 400 cfm = 1200 * .28 = 336 cfm

  12. Quick Review of Common Duct Problems

  13. Residential HVAC Change-outs Duct systems must be tested & sealed if ALL of the following conditions apply: Building permit applied for on or after October 1, 2005

  14. Climate Zones Residential Duct Testing Rules Apply ONLY in Climate Zones: 2, 9, 10, 11, 12, 13, 14, 15 & 16 Exempt Climate Zones 1, 3, 4, 5, 6, 7, 8

  15. California Climate Zones

  16. Ducts in Unconditioned Space At least 40 linear feet of duct work must be located in unconditioned space.

  17. Asbestos Exemption Ductwork made with or insulated with asbestos is EXEMPT

  18. Duct Testing Required When Any of the Following Components are Replaced • Air handler or furnace • Outdoor condensing unit (split systems) • Heating or cooling coil • Furnace heat exchanger • Package unit

  19. Additional Ductwork Adding or replacing 40 linear feet or more of duct work in unconditioned space

  20. Maximum Leakage RateExisting Duct Work 1. 15% of fan flow 400 cfm/ton * .15 = 60 cfm3 tons * 60 cfm = 180 cfm target or 2. 60% Reduction Test before replacement and after: 600 cfm initial test (example only) 60% reduction = 240 cfm target or

  21. Maximum Leakage (cont) 3. Duct leakage to outside of house 10% or less (whole house blower door test plus duct leakage test) or 4. Seal all accessible leaks and verify by HERS Rater (with “smoke”)

  22. Maximum Leakage RatesCompletely New Duct System HVAC system change-outs that include all new duct work – same duct testing standards as new construction. 6% of air flow (24 cfm / ton)

  23. Verification 1. Contractor tests 2. HERS Rater verifies

  24. Residential Alternatives Are there any alternatives to performing the duct sealing and testing?

  25. Option 1 Climate Zones 2, 12, & 16 only 0.92 AFUE Furnace

  26. Option 2 Climate Zones 10, 13, & 15 only SEER 14 EER 12 TXV R-8 insulation on all new duct work Additional R-4 on all existing duct work

  27. Option 3 All Climate Zones SEER 14 EER 12 TXV Plus 0.92 AFUE Furnace SEER 14 EER 12 TXV Plus 0.82 AFUE Furnace R-8 insulation on all new duct work Additional R-4 on all existing duct work

  28. TXV Options 2 & 3 do not require TXV’s with package systems.

  29. October 1, 2005 NonResidential Duct systems must be sealed when all of the following apply: Permit applied for on or after October 1, 2005 And (next page)

  30. Unconditioned Space At least 25% of ductwork is outdoors or in unconditioned space And (next page)

  31. Climate Zones NonResidential Duct Testing Rules Apply in ALL Climate Zones: And (next page)

  32. Asbestos Exemption Ductwork made with or insulated with asbestos is EXEMPT And (next page)

  33. Constant Volume Constant volume package or split system (not a VAV system) And (next page)

  34. 5,000 s.f. – each unit Each HVAC unit serves 5,000 s.f. or less floor area.Rules still apply if total area is greater, as long as each unit serves only 5,000 s.f. And (next page)

  35. Scope of Work • Air handler or furnace • Outdoor condensing unit (split systems) • Heating or cooling coil • Furnace heat exchanger • Package unit

  36. Maximum LeakageExisting Ductwork 1. 15% of fan flow 400 cfm/ton * .15 = 60 cfm3 tons * 60 cfm = 180 cfm target 2. 60% Reduction Test before and after replacement For example: 600 cfm initial test 60% reduction = 240 cfm target

  37. Maximum Leakage (cont) 3. Seal all accessible leaks verified by HERS Rater (usually with “smoke”)

  38. Maximum LeakageCompletely New Duct System HVAC system change-outs that include all new duct work 6% of air flow (24 cfm / ton)

  39. NonRes Alternatives Are there any alternatives to performing the duct sealing and testing?

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