welcome to field controls: hrv / erv training duct systems part 3

Welcome to Field Controls:Welcome to Field Controls:

HRV / ERV TrainingHRV / ERV Training

Duct SystemsDuct Systems

Part 3Part 3

Sign In Information SheetsSign 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

IntroductionIntroduction HRV – ERV Duct Systems

A. Simplified System

B. Partially Dedicated System

C. Fully Dedicated System

D. Design Tips

E. Installation Considerations

F. Test

G. Review and Comments

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

Simplified SystemSimplified System

Fresh Air to Inside

Stale Air from InsideStale Air to

Outside

Fresh Air from Outside

Simplified InstallationSimplified Installation Return / Return Method

HVACEquipment

Ventilation System must be electrically interlocked with HVAC Equipment Fan

Return Air Duct

Simplified InstallationSimplified Installation

Simplified InstallationSimplified Installation

HVAC Equipment

Note: New construction seal all metal ducts with mastic for Energy star 3.0 pressurized duct test

Page 15

Partially Dedicated SystemPartially Dedicated System

Fresh Air to Inside

Stale Air from Inside

Stale Air to Outside

Fresh Air from

Outside

Partially Dedicated SystemPartially Dedicated System

Return Air

HVACEquipment

Page 15

Partially Dedicated InstallationPartially Dedicated Installation

Page 15

New Construction: Energy Star 3.0 requires the duct system to be pressure tested

Partially Dedicated InstallationPartially Dedicated Installation

HVAC Equipment

Note: Seal all metal ducts with mastic to pass a pressurized duct test according to Energy Star 3.0

Page 16

Fully Dedicated SystemFully Dedicated System

Stale Air Exhaust

Fresh Air to Inside

Fresh Air Intake

Stale Air from Inside

Fully Dedicated InstallationFully Dedicated Installation

Fully Dedicated InstallationFully Dedicated Installation

Fully Dedicated InstallationFully Dedicated Installation

Design Drawing TipsDesign Drawing Tips

• Include all branches and connections

Design tips:Design tips:o Minimize duct lengths o Minimize bends o Use 45° elbows instead of 90° o Use “Y” s instead of a Teeso Join the unit and duct system with

non-metallic insulated duct 12 inches in length (noise / vibration)

4 - 4 - Installation Installation

ConsiderationConsiderationss• 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

Ducts: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

Duct Systems TestDuct Systems Test

1. Flex duct must be stretched tightly and supported properly with

appropriate hangers.

True or False

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

True or False

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 MethodE.  None of the above

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 MethodE.  None of the above.

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

6. Another name for a Simplified Installation

A. The Supply Return MethodB. The Return / Supply MethodC. A Partially Dedicated SystemD. The Return / Return MethodE. None of the above

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

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

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.

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

True or False

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

True or False

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

True or False

13. General installation considerations are

A. Fresh air intake and stale air exhaust locationsB. Condensate drainageC. Install unit in the conditioned spaceD. Provide access for service and maintenanceE. All the aboveF. None of the above

14. Energy Star Homes

A. Seal duct joints and fittings with foil tapeB. Seal duct joints and fittings with duct tapeC. Seal duct joints and fittings using screws or rivetsD. Seal all duct joints with mastic E. All the aboveF. None of the above

15. Energy Star Homes

A. A recognized label for energy efficient homesB. Require ventilation according to ASHRAE 62.2C. Require a pressurized duct leakage testD. Require manual J load calculations E. All the aboveF. None of the above

QuestionsQuestions