ACCA Quality Homes ACCA 12 QH 2011 (Existing Home Evaluation and Performance Improvement) Developed in cooperation with RESNET

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1 ACCA Quality Homes ACCA 12 QH 2011 (Existing Home Evaluation and Performance Improvement) Developed in cooperation with RESNET Wes Davis Director, Quality Assured Program Air Conditioning Contractors of America 2012 RESNET Conference Austin, TX 28 February 2012

2 The Air Conditioning Contractors of America (ACCA) The only nationwide association representing the technical, educational and policy interests of U.S. businesses that design, install and maintain indoor environmental systems

3 Antecedents National Warm Air Heating and Air Conditioning Assn. (1914) Air Conditioning and Refrigeration Contractors of America (1946) National Environmental Systems Contractors Assn. (1968) Air Conditioning Contractors of America (1969)

4 Mission Statement To assist and enable HVACR contractors to acquire, serve and satisfy their customers.

5 Approach Contractor Support Consumer Assistance Government Relations Industry Relations Technical Expertise

6 Membership About 5,000 Members In all 50 States and 12 foreign countries 43 Chapters across America

7 Projects Under development Manual S (Residential Equipment Selection) Numerous Technical Bulletins Recent publications Manual Zr (Residential Zoning Manual) Manual SPS (Swimming Pools and Spas) Manual B (Balancing and Testing Air and Hydronic Systems) 4 year Apprenticeship Manual

8 ACCA 12 QH: Background Existing documents were lacking HVAC efficiency HVAC industry combustion safety Standard language Industry stakeholders requested a document that could be used and enforced.

9 ACCA 12 QH: Overview Purpose Scope Appendices Free PDF download

10 Purpose ACCA 12 QH: Overview Set minimums Requirements Procedures Documentation Information collection: audit Information assessment: identify improvements Information presentation: scopes of work Work performed to standards Work evaluated on completion

11 ACCA 12 QH: Overview Scope Site built or manufactured Single- or Two- Family Townhouses 3 Stories and less

12 ACCA 12 QH: Overview Appendices Appendix A: Procedures Appendix B: Additional Elements Appendix C: Tables Appendix D: Definitions Appendix E: Bibliography

13 ACCA 12 QH: Overview Comprehensive Audit Interview Onsite Data Collection Health and Safety (fossil fuel appliances) Envelope Ventilation Insulation Heating and Cooling systems Water Heating Fenestration Appliances and equipment Plumbing fixtures Moisture Pools and Spas Documentation

14 Interview ACCA 12 QH: Overview Comprehensive Audit Why an interview What to learn Not the only questions

15 ACCA 12 QH: Overview Comprehensive Audit Onsite Data Collection Information for energy modeling

16 ACCA 12 QH: Overview Comprehensive Audit Health and Safety (fossil fuel appliances) CO Testing Combustion appliance flue gases Accessible venting system Combustion Appliance Zone Gas/Oil Leakage Unvented Combustion Appliances Combustion Appliance Zone Volume Depressurization Test Combustion Appliance Venting

17 ACCA 12 QH: Overview Comprehensive Audit Health and Safety (fossil fuel appliances) CO Testing Combustion appliance flue gases Accessible venting system Combustion Appliance Zone Gas/Oil Leakage Unvented Combustion Appliances Combustion Appliance Zone Volume Depressurization Test Combustion Appliance Venting

18 ACCA 12 QH: Overview Comprehensive Audit Health and Safety (fossil fuel appliances) CO Testing Combustion appliance flue gases Accessible venting system Combustion Appliance Zone Gas/Oil Leakage Unvented Combustion Appliances Combustion Appliance Zone Volume Depressurization Test Combustion Appliance Venting

19 ACCA 12 QH: Overview Comprehensive Audit Health and Safety (fossil fuel appliances) CO Testing Combustion appliance flue gases Accessible venting system Combustion Appliance Zone Gas/Oil Leakage Unvented Combustion Appliances Combustion Appliance Zone Volume Depressurization Test Combustion Appliance Venting

20 ACCA 12 QH: Overview Comprehensive Audit Health and Safety (fossil fuel appliances) CO Testing Combustion appliance flue gases Accessible venting system Combustion Appliance Zone Gas/Oil Leakage Unvented Combustion Appliances Combustion Appliance Zone Volume Depressurization Test Combustion Appliance Venting

21 ACCA 12 QH: Overview Comprehensive Audit Health and Safety (fossil fuel appliances) CO Testing Combustion appliance flue gases Accessible venting system Combustion Appliance Zone Gas/Oil Leakage Unvented Combustion Appliances Combustion Appliance Zone Volume Depressurization Test Combustion Appliance Venting

22 Envelope ACCA 12 QH: Overview Comprehensive Audit Measure the envelope leakage

23 Ventilation ACCA 12 QH: Overview Comprehensive Audit What should be the ventilation rate?

24 Insulation ACCA 12 QH: Overview Comprehensive Audit What is there?

25 ACCA 12 QH: Overview Comprehensive Audit Heating and Cooling systems Validation of Capacity to Load If the equipment is to be replaced Airflow Distribution System Temperature Difference Room Temperature Difference Duct Leakage Testing Room-Pressure Difference

26 ACCA 12 QH: Overview Comprehensive Audit Heating and Cooling systems Validation of Capacity to Load If the equipment is to be replaced Airflow Distribution System Temperature Difference Room Temperature Difference Duct Leakage Testing Room-Pressure Difference

27 ACCA 12 QH: Overview Comprehensive Audit Heating and Cooling systems Validation of Capacity to Load If the equipment is to be replaced Airflow Distribution System Temperature Difference Room Temperature Difference Duct Leakage Testing Room-Pressure Difference

28 ACCA 12 QH: Overview Comprehensive Audit Heating and Cooling systems Validation of Capacity to Load If the equipment is to be replaced Airflow Distribution System Temperature Difference Room Temperature Difference Duct Leakage Testing Room-Pressure Difference

29 ACCA 12 QH: Overview Comprehensive Audit Heating and Cooling systems Validation of Capacity to Load If the equipment is to be replaced Airflow Distribution System Temperature Difference Room Temperature Difference Duct Leakage Testing Room-Pressure Difference

30 ACCA 12 QH: Overview Comprehensive Audit Heating and Cooling systems Transfer Validation of Capacity to Load If the equipment is to be replaced Airflow Transfer Distribution System Temperature Difference Grilles Room Temperature Difference Duct Leakage Testing Room-Pressure Difference Duct Ducted Return (Hall) Cased Opening

31 ACCA 12 QH: Overview Comprehensive Audit Water Heating

32 ACCA 12 QH: Overview Fenestration Comprehensive Audit North? South? Southwest?

33 ACCA 12 QH: Overview Comprehensive Audit Appliances and equipment

34 ACCA 12 QH: Overview Comprehensive Audit Plumbing fixtures

35 Moisture ACCA 12 QH: Overview Comprehensive Audit

36 ACCA 12 QH: Overview Comprehensive Audit Pools and Spas

37 ACCA 12 QH: Overview Comprehensive Audit Documentation

38 ACCA 12 QH: Overview Assessing Improvements Benchmarks Table 2 Suitable substitutions Evaluation

39 ACCA 12 QH: Overview Assessing Improvements Evaluation Cost / Benefit Analysis (energy conservation) Historical knowledge Fixed price proposals revise priorities Prices based on industry standard compliance Note: Historical trueing up $ $

40 Evaluation ACCA 12 QH: Overview Assessing Improvements Additional Elements Age Condition Hazardous materials Cascading requirements Flashing Sheathing Siding Permit Wiring

41 ACCA 12 QH: Overview Presenting Improvements Prioritizing Presenting Requirements Documentation

42 ACCA 12 QH: Presenting Improvements Prioritizing First: Combustion safety CO Fuel Leaks Unlisted unvented combustion appliances (primary heat source)

43 ACCA 12 QH: Overview Presenting Improvements Prioritizing Second: Ventilation and Moisture issues

44 ACCA 12 QH: Overview Presenting Improvements Prioritizing Third: Energy savings Largest energy savings Best cost to best benefit

45 ACCA 12 QH: Overview Presenting Improvements Prioritizing Fourth: Comfort, IAQ, Durability

46 ACCA 12 QH: Overview Presenting Improvements Presenting Owner interaction Presented by priority Chosen by Owner Adverse effects Tightened envelope Combustion Appliances Moisture

47 ACCA 12 QH: Overview Presenting Improvements Requirements (Thou shalt ) Codes HVAC sized for changes Duct leakage (before and after) Energy savings estimated Bids to standards (Section 6.0) Require test-out (Section 7.0)

48 ACCA 12 QH: Overview Presenting Improvements Requirements (Thou shalt ) Identify your software Recommend Radon testing Recommend allergen testing Include envelope test after remediation of hazardous materials CO detectors in bedrooms with combustion appliances

49 ACCA 12 QH: Overview Presenting Improvements Documentation Findings and benchmarks Scopes of Work Cost/benefit analysis information Signed release

50 ACCA 12 QH: Implementing Improvements Safety Envelope Ventilation Insulation HVAC Fenestration Appliances Plumbing Moisture Pools and Spas

51 ACCA 12 QH: Implementing Improvements Safety CO, spillage and drafting issues Combustion air CO detectors Radon testing

52 ACCA 12 QH: Implementing Improvements Envelope Air sealing to reduce stack effect inhibit moisture Thermal and pressure boundary Leakage paths to garages Leakage paths (enclosed cavities) 15% rule Attic venting per code Lead: EPA Renovation, Repair, and Painting

53 ACCA 12 QH: Implementing Improvements Ventilation ASHRAE 62.2 and IECC 2009 OEM instructions, codes, industry practices Measured Effective thermal/pressure barrier before attic venting

54 ACCA 12 QH: Implementing Improvements Insulation OEM recommendations or standards Moisture remediation and air barrier before insulation 15% rule Document material and R-value Vented eaves and soffit baffles Pitched ceilings and Loose fill insulation Dense pack Unvented flat roof

55 ACCA 12 QH: Implementing Improvements HVAC Install to QI Maintain to QM Restore to QR Ducts outside thermal envelope New ventilation Installed per OEM Balanced to design Comply with IRC

56 ACCA 12 QH: Implementing Improvements Fenestration: ASTM E2112 Appliances: OEM instructions and Code Plumbing: OEM instructions and Code Moisture: Find and fix the source

57 ACCA 12 QH: Implementing Improvements Pools and Spas: Suction outlet covers Energy efficient components per ANSI/ICC/APSP 15 and IRC Pool covers per APSP New HVAC systems for indoor pools per ACCA SPS

58 ACCA 12 QH: Test out Independent Auditor Per the signed proposal Envelope tightness improvements = Combustion appliances tested

59 ACCA 12 QH: Appendix A Appendix A: Procedures

60 ACCA 12 QH: Appendix B Appendix B: Additional Elements

61 ACCA 12 QH: Appendix C Appendix C: Tables

62 ACCA 12 QH: Appendix D Appendix D: Glossary

63 ACCA 12 QH: Appendix E Appendix E: Pertinent Bibliography and Resources

64 Conclusion ACCA 12 QH: Overview A need identified A standard written Refined by public review

65 ACCA 12 QH: Wesley R. Davis (703)

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