Welcome to Field Controls: HRV / ERV Training Duct Systems Part 3

1. Welcome to Field Controls: HRV / ERV Training Duct Systems Part 3

2. Sign In Information Sheets • Make sure you have completed all sign in sheets • Please print legibly and double check your information • Make sure to include your identification numbers • Complete information is necessary for CEHs and recognition • NATE Credit requires a specific sign in sheet

3. Introduction • HRV – ERV Duct Systems • Simplified System • Partially Dedicated System • Fully Dedicated System • Design Tips • E. Installation Considerations • F. Test • G. Review and Comments

4. Simplified System Turn to the “Simplified Installation” page 14 in the Instruction Manual

5. Simplified Installation Return / Return Method Fresh Air to Inside Return Air Duct Fresh Air from Outside Stale Air from Inside Stale Air to Outside HVAC Equipment Ventilation System must be electrically interlocked with HVAC Equipment Fan

6. Simplified Installation

7. Simplified Installation HVAC Equipment Note: New construction seal all metal ducts with mastic for Energy star 3.0 pressurized duct test

8. Partially Dedicated System Page 15

9. Partially Dedicated System Stale Air from Inside Fresh Air to Inside Return Air Fresh Air from Outside Stale Air to Outside HVAC Equipment Page 15

10. Partially Dedicated Installation New Construction: Energy Star 3.0 requires the duct system to be pressure tested Page 15

11. Partially Dedicated Installation HVAC Equipment Note: Seal all metal ducts with mastic to pass a pressurized duct test according to Energy Star 3.0

12. Fully Dedicated System Page 16

13. Fully Dedicated Installation Stale Air from Inside Fresh Air to Inside Fresh Air Intake Stale Air Exhaust

14. Fully Dedicated Installation

15. Fully Dedicated Installation

16. Design Drawing Tips • Include all branches and connections • Design tips: • Minimize duct lengths • Minimize bends • Use 45° elbows instead of 90° • Use “Y” s instead of a Tees • Join the unit and duct system with non-metallic insulated duct 12 inches in length (noise / vibration)

17. 4 - Installation Considerations • Fresh air intake and stale • air exhaust locations • Condensate drainage • Space is conditioned • Not below 60°F • Not above 100°F • Access for service • Maintenance / Cleaning

18. Ducts: • Keep duct runs short • Minimize 90° elbows • 45° elbows preferred • Y’s instead of tees • Rigid duct recommended • Energy Star homes use mastic to seal duct joints

19. Duct Systems Test

20. 1. Flex duct must be stretched tightly and supported properly with appropriate hangers. True or False

21. 2. Metal duct seams should be sealed with mastic to pass a Energy star 3.0 pressurized duct leakage test? True or False

22. 3. When installing a HRV or ERV in • conjunction with an existing forced air • HVAC system you will use: • A.  Partially Dedicated Installation Method • B.  Simplified Installation Method • C.  Fully Dedicated Installation Method • D.  Partially Dedicated or Simplified Installation Method • E.  None of the above

23. 4. When installing an HRV or ERV without • a ducted forced air system you will use: • A.  Partially Dedicated Installation Method • B.  Simplified Installation Method • C.  Fully Dedicated Installation Method • D.  Partially Dedicated or Simplified Installation Method • E.  None of the above.

24. 5. Simplified Installation: stale air is exhausted from the return air of the ducted HVAC equipment and an equal amount of fresh air is replaced back into the return air. True or False

25. 6. Another name for a Simplified Installation • A. The Supply Return Method • B. The Return / Supply Method • C. A Partially Dedicated System • D. The Return / Return Method • E. None of the above

26. 7. A Simplified Installation does not require the furnace blower to run continuously or be electrically interlocked with the HRV or ERV. True or False

27. 8. Partially Dedicated System: stale air is exhausted from specific locations (bathroom, kitchen etc) and an equal amount of fresh air is replaced back into the HVAC system return air. True or False

28. 9. Install a backdraft damper on: • A.  Partially Dedicated Installation • B.  Simplified Installation • C.  Fully Dedicated Installation • D.  Partially Dedicated and Simplified Installation • E.  None of the above.

29. 10. A Fully Dedicated System is normally installed in homes without a ducted forced air system. True or False

30. 11. On a Fully Dedicated Installation the supply ducts deliver fresh air to bathrooms, kitchen, laundry room, etc. True or False

31. 12. Resistance to air flow is called External Static Pressure (e.s.p.) True or False

32. 13. General installation considerations are • A. Fresh air intake and stale air exhaust locations • B. Condensate drainage • C. Install unit in the conditioned space • D. Provide access for service and maintenance • E. All the above • F. None of the above

33. 14. Energy Star Homes • A. Seal duct joints and fittings with foil tape • B. Seal duct joints and fittings with duct tape • C. Seal duct joints and fittings using screws or rivets • D. Seal all duct joints with mastic • E. All the above • F. None of the above

34. 15. Energy Star Homes • A. A recognized label for energy efficient homes • B. Require ventilation according to ASHRAE 62.2 • C. Require a pressurized duct leakage test • D. Require manual J load calculations • E. All the above • F. None of the above

35. Questions