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Welcome to Field Controls Residential Ventilation Part 2

Welcome to Field Controls Residential Ventilation Part 2. 1. Introduction. HHS Demo Free download at Apple App store or Droid free play Why ventilation is necessary How HRVs & ERVs work Determining the ventilation ACH Method ASHRAE 62.2 E. Function and role of controls.

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Welcome to Field Controls Residential Ventilation Part 2

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  1. Welcome to Field Controls Residential Ventilation Part 2 1

  2. Introduction • HHS Demo Free download at Apple App store or Droid free play • Why ventilation is necessary • How HRVs & ERVs work • Determining the ventilation • ACH Method • ASHRAE 62.2 • E. Function and role of controls 3

  3. Why Do We Need Ventilation? Why do we need ventilation? What are the signs of poor ventilation? 4

  4. Why Do We Need Ventilation? • Older homes typically, have passive ventilation • Uncontrolled ventilation • No heat or energy recovery • Cold and drafty in heating season • Higher energy bills for Cooling & Heating • Newer homes have a vapor barrier that minimizes air infiltration • Poor indoor air quality • High indoor humidity in heating season • Stale air 5

  5. Why Do We Need Ventilation? • Sources of indoor air contamination: • Chemicals (cleaners, paints solvents) • Carpeting / Furniture • Cabinetry / Building materials • People and their behavior • Cooking • Showering • Pets – dander, litter boxes • Radon – soil gas • Attached garage 6

  6. Why Do We Need Ventilation? • The Result: • Indoor air can be up to 100 times • more polluted than outdoor air. • Even in our largest and most • industrialized cities. • Environmental Protection Agency • (EPA) 7

  7. Why Do We Need Ventilation? Indoor Air Quality Facts: • Asthma and severe allergies affect some 57 million people.- Environmental Protection Agency • Asthma incidence has jumped 61% since 1982 Coincidental with tighter home construction practices. • Asthma is the leading cause of chronic illness in young children. 6.8 million children have asthma.American Lung Association • 45% of homes in the United States have someone with a respiratory related illness • 1.9 Million emergency doctor visits a year 8

  8. Why Do We Need Ventilation? • Types of indoor air contaminants: • Formaldehyde Off gassing of furniture carpets etc… • Carbon Dioxide CO2 & Carbon Monoxide CO • Volatile Organic Compounds VOCs • Suspended Particulate (cigarette smoke, dust) • Mold and Mildew • Viruses and bacteria 9

  9. Why Do We Need Ventilation? • Ailments caused / exacerbated by indoor air pollutants: • Allergies • Respiratory problems / breathing disorders such as: • asthma, emphysema, bronchial and others…. • Increased illnesses • Hypersensitivity: • 20% of absenteeism are related to allergies and other respiratory illness 10

  10. What is being done about the growing issues? 11

  11. Money in the bag! • The tighter the building, the worse the indoor air quality • Modern buildings are well insulated and sealed to conserve energy • Many home improvements are being done which also means tighter older homes • Poor air quality contributes to allergies, asthma, headaches, fatigue, etc… 12

  12. Why ventilation is necessary! 13

  13. How It Works Whatdoes the HRV do ? 14

  14. How It Works Definition: A “balanced” system introduces the same amount of air into the building as it exhausts. 15

  15. Stale Air From Inside Fresh Air From Outside PART I How It Works 16

  16. How It Works Stale Air to Outside Fresh Air to Inside Stale Air to Outside Fresh Air to Inside Balanced Ventilation with up to 88% Heat Recovery 17

  17. Sensible Effectiveness OD Temp + (Effectiveness X (ID Temp – OD Temp)) = Delivered Air Temperature Example: 70°F Indoor Temp. / 32°F Outdoor Temp. HRV200 example 74% Effectiveness @ 32F 32 F + (.74 x (38) ) = 60 F HRV95 example 88% Effectiveness @ 32F 32F + (.88 x (38) ) = 65 F A huge difference versus open window / draft ventilation 18

  18. HRV & ERV • Heat Recovery Ventilators (HRV) are used in areas that typically spend more time in a heating season than cooling • Energy Recovery Ventilators (ERV) are designed for the areas of the deep south that experience high humidity, and have longer cooling seasons than heating • ERVs are not suitable for climates where the temperature drops below 25°F for more than 5 days in a row 19

  19. Models • FC95HRV • FC155HRV • FC200HRV • FC150ERV HRVs and ERV 20

  20. FC95HRV • 95 CFM airflow size range • 88% Sensible Effectiveness • Compact design for tight installations • Patented Aluminum HRV Core • Built in relay for appliance fan interface • Dehumidistat disable feature • Controls are accessories 21

  21. FCHRV155 & FCHRV200 155 & 200 CFM airflow size ranges Sensible Effectiveness 73% & 74% Balancing Collars (2) Built in Door port balancing (optional part) Recirculation Defrost Built in relay appliance fan interface Dehumidistat disable feature External terminal block wiring Patented Aluminum HRV Core Controls are Accessories 22

  22. FCERV150 • 150 CFM airflow size range • Sensible Effectiveness 81% • Warm humid climates • Core transfers heat & moisture • Built in relay interface to Fan • External terminal block • Dehumidistat disable feature • Controls are Accessories • Core Vacuum or Cold water rinse No Defrost 23

  23. How It Works • HRV Core • 124 Aluminum plates • 62 cells for Fresh incoming air • 62 cells for Stale exhaust air • Lifetime Core Warranty • Wash in warm soapy water • Warm water Rinse • Do not pressure wash • Do not place in dishwasher Aluminum HRV Core 24

  24. How It Works • ERV Core • 124 Energy Exchanging Cells • 62 for incoming Fresh air • 62 for exhausting Stale air • 5 Year Warranty • Clean - Vacuum or cold water rinse 25

  25. HRV or ERV Climate Zone Map • Developed by Department of Energy (DOE) • International Energy Conservation Code (IECC) • ASHRAE 62.2 26

  26. Defrost Operation 27

  27. Defrost Operation Thermistor As outdoor conditions cool, the temperature sensor (thermistor) tracks the supply air temperature 28

  28. Defrost Operation Convert Temps in notes to F Defrost Damper Closing Heat Recovery Ventilator 29

  29. Defrost Operation Warm air from inside Defrost Damper Closed Re-circulated air warms the core Heat Recovery Ventilator 30

  30. Defrost Operation No Flow Warm air from inside Defrost Damper Remains Closed Re-circulated air warms the core Heat Recovery Ventilator 31

  31. Winter Humidity Reduction Field Controls HRV • Reduces winter indoor humidity levels • Window condensation can cause • micro colonies of mold • Ignoring the issue can lead to more • sever problems 32

  32. Winter Humidity Reduction • Tight homes can have high humidity • during the heating season! • Signs of condensation • Moisture / water vapor on windows • Mold / mildew formation • Musty odors 33

  33. Winter Humidity Reduction • A Dehumidistat feature is on the Dehumidistat Ventilation control • It automatically initiates high-speed ventilation when indoor humidity levels reach or exceed the set point • The HRV automatically reverts back to it’s previous fan speed once humidity levels are reduced 34

  34. Winter Humidity Reduction • De-humidistat Disable • Thermistor measures outside temperature every 6 hours • 4 consecutive reading above 59°F disables De-humidistat • 4 consecutive reading below 59°F reinstates De-humidistat Thermistor Fresh Air Intake 35

  35. How Much Ventilation is Required? • How do you determine • the ventilation for a • home? 36

  36. How Much Ventilation is Required? Air Change per Hour Method AC/H = (square footage x ceiling height) / 60) x 0.35 37

  37. How Much Ventilation is Required? • Example: Air Change per Hour Method • Formula AC/H = (square footage x ceiling height) / 60) x 0.35 • 1500 Sq. ft. home 8 ft. ceilings • 1500 x 8 = 12,000 cu. ft. (total volume) • 12,000 cu. ft. ÷ 60 = 200 • 200 x 0.35 = 70CFM 38

  38. How Much Ventilation is Required? ASHRAE 62.2 Required for New Housing Energy Star 3.0 Ventilation Rate = (square footage/100) + ((# Bdrms+1) (7.5)) Note: Must count the basement / conditioned space (Compliance for Energy Star 3.0 July 1, 2012) 40

  39. How Much Ventilation is Required? • ASHRAE 62.2 • Ventilation Rate = (square footage/100) + ((Bdrm.+1) (7.5)) • (+ 1 figures 2 people in the master bedroom) • Example: • 2 story house with basement 2 Bdrm. total 1500 sq. ft. • 1500 sq. ft. ÷ 100 = 15 CFM • 2 Bdrm. x 7.5 = 15 + (1) 7.5 = 22.5 CFM • 15 CFM + 22.5 CFM = 37.5 CFM Constant 41

  40. ASHRAE 62.2 43

  41. Controls Instruction Manual Page 4 58

  42. Controls Default Setting Fan Off 20 minutes Fan On 10 minutes Vent On 10 minutes Vent Off 20 minutes 57

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