Retrotec DucTester 340

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©Retrotec 2017

Use the manual Speed Control Knob on the Fan Top. Increase the fan speed until a stable

pressure of 25 Pa (or -25 Pa) is displayed for Duct Pressure (Channel A). Press [@] button

until “@ is ON” is displayed to view the results at exactly 25 Pa. If your standard requires

50 Pa, change the [Default @ Pressure] to 50 Pa from the [Settings] menu.

7. If "--" appears as the flow result, or the desired test pressure cannot be reached, change the Range

Configuration on the fan and on the gauge to match (see section 6.8).

Main Page

Default Chapter3
- Default Chapter3
  - Table of Contents3
- Important Equipment-Related Safeguards8
- Important Occupant Safeguards During Testing8
1 Why Measure Duct Leakage10
- Energy Loss10
- Duct Sealing Saves Money10
- Problems from Duct Leakage10
2 How Much Duct Leakage Is Acceptable under Existing Codes11
3 Model 300 / 400 System Types14
4 Types of Duct Leakage Tests15
- What Is Duct Leakage to the Outdoors15
- What Is Duct Leakage to the Indoors15
5 Model 340 Ductesters17
- Models Include US340 and EU340 with 10 Inch Flex Duct17
- The Calibrated Ductester Fan17
  - Range Configurations18
  - Retrotec Calibrated Fan: Model 30019
- Digital Gauge21
- Flex Duct21
- Additional Included Duct Testing Components22
6 Prepare for the Duct Leakage Test24
- Unpack, Connect the Gauge to the Ductester24
- Charge the Gauge24
- Follow the Quick Guide that Came with Your System24
- Seal All Supply Registers26
  - Before Beginning the Duct Leakage Test26
- Make All Connections on the Gauge and Fan27
- Blue Tube Location Matters When Testing Leaky Ducts28
- Connect the Flex Duct to the Duct System29
- Install Range Configuration on Fan32
- Select a Test Direction then Connect Flex Duct to the Ductester32
  - Blow Air into the Ducts for Depressurization32
  - Blow Air out of the Ducts for Pressurization33
7 Set up the Gauge to Display Duct Leakage Results34
- Mode Setup for Duct Testing in the US34
- Mode Setup for Various Standards Around the World35
- Setting up and Using the DM32 Gauge for Duct Testing35
8 Conduct the Duct Leakage Test37
- Total Duct Leakage37
- Duct Leakage to Outdoors with 2 Gauges and 2 Fans38
  - Method #1: Set both Duct and House to -25 Pa (or 25 Pa)38
  - Method #2: Set Duct to House Pressure to 0 Pa (Using Ductester Gauge)39
- Duct Leakage to Outdoors with 1 Gauge and 2 Fans41
- Combined Total Duct Leakage and Duct Leakage to Outdoors Method43
- If no Results Are Displayed44
- Retrotec44
- Cannot Achieve Test Pressure45
9 Restore the House to Pre-Test Conditions after Testing Is Complete46
10 Create a Duct Leakage Test Report with Potential Energy Savings47
- Get the Excel Spreadsheet Based Software to Run on Your System48
- Choose Metric or Imperial Units for Results49
  - Imperial Units49
  - Metric Units49
- Choose Duct Test Type50
- Enter the Target Test Pressure50
- Enter Date the Test was Carried out50
- Enter Specific Parameters for the Conditions of this Test50
- Enter Readings from this Test51
- Spreadsheet will Calculate Cost of Duct Leakage53
- Save the Duct Leakage Test Report as a PDF File55
  - With Office 200755
  - With Office 201055
11 Find Air Leaks in the Ducts56
- Using a Smoke Puffer56
- Using Theatrical Smoke56
- Using an Infrared Camera56
- Using a Wet Hand56
- Using a Pressure Pan56
12 Measure the Air Handler System Flow58
- For Code Compliance58
- Why Measure the Air Handler System Flow58
- Measure with a Ductester as a Powered Flow Hood on the Return58
- Measure Air Handler Flow Using a Blower Door59
  - Supply Plenum Pressure Matching Method59
  - Set Pressure in Front of Return Register to Zero Method or Using Your Blower Door as a Powered Flow Hood61
- Measure Large Exhaust and Intake Flow Rates62
- Measure with a Ductester on the Air Handler Cabinet63
- Measure with a Gauge and a Flow Grid63
- Measure Using Air Handler Blower Curves63
- Measure Using Hole Flow on the Gauge64
- Measure with a Blower Door Attached to the Return or Cabinet64
- Other Methods64
13 Estimate HVAC System Energy Loss from Ducts65
- Duct Air Leakage Measurements65
- Methodology65
14 Field Check the Ductester to Find out What Is Not Working69
- Field Check the Gauge69
- Field Check the Ductester as a System69
15 Avoid Common Mistakes70
16 Create a Blower Door with a Ductester Fan72
- Use a Ductester to Test Tight Enclosures72
- Blower Door Systems for Testing Tight Enclosures72
- Retrotec73
Appendix A: Calculate Air Flow Based on Channel B Fan Pressure Readings74
Appendix B: Flow Conversion Tables75
- Flow Conversion Table for Duct Test Pressure of 25 Pa75
Appendix C: Calculate Flow if Required Test Pressure Cannot be Reached76
- Extrapolation Error for Flow if Gauge "N" Doesn't Match Actual N77
- Cannot Reach 25 Pa Factors78
- Cannot Reach 50 Pa Factors79
  - Appears on Display81
Appendix D: Troubleshooting81
- Gauge "Flow" Reading Does Not Change? Turn off [@]81
- Fan Does Not Run81
- Checking the Ductester Flows81
- Adjusting the Fan Inlet Nozzle if Is Rubbing or Debris Needs to be Removed from Fan82
Appendix E: Using a Generator for Power83
- Generators84
- Honda Generator EU3000 (120V, 2000W, 67 Lbs)84
- GENYX G3000HI (230V, 3000W) Generator84
- Portable Power Supplies84
- Black and Decker Electromate 400 Model VEC026BD84
Appendix F: Duct-Test Recording Forms85
- Total Duct Leakage Test Form Test Date85
- Total Duct Leakage Test Form (CA) Test Date86
Glossary88

Retrotec DucTester 340 - Page 36

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