Retrotec DM-2A Manual de usuario

 Use a wind dampening kit

Imbalanced test fan flow – Solution : common set point 1. What is the total leakage area (EqLA)? (Pick the closest answer) 10 in2 __ , 20 in2 _

Uneven building test pressures between floors caused by common set point Click to play video Developed by Retrotec Inc. Exercise 3

Uneven building test pressures between floors caused by common set point Developed by Retrotec Inc. Exercise 3 Only 1 gauge controls the speed o

Uneven building test pressures between floors caused by common set point 1. What is the pressure of the right Simulator Tent? (Pick the closest answ

Uneven building test pressures between floors – Solution: individual set points Click to play video Developed by Retrotec Inc. Exercise 4

Uneven building test pressures between floors – Solution: individual set points Developed by Retrotec Inc. Exercise 4

Uneven building test pressures between floors – Solution: individual set points 1. What is the flow through the left Simulator Tent? (Pick the cl

Uneven building test pressures between floors – Solution: individual set point with manual control Click to play video Developed by Retrotec In

Uneven building test pressures between floors – Solution: individual set point with manual control Developed by Retrotec Inc. Exercise 5

Uneven building test pressures between floors –Solution: individual set point with manual control 1. What is the flow through the left Simulator Te

Take a baseline to negate the effects of bias pressure and wind fluctuations.  What does taking a baseline do?

1. Press [Baseline] once. 2. Press [Start] once 3.Wait until number is steady then press [ENTER] once to save. The measure baseline is automatically

1. Press [Baseline] once 2. Press [Enter] after about 60 seconds. The measured baseline is subtracted from the pressure reading on Channel PrA.

Learn when and how the baseline is cleared from each gauge. Leaving the baseline on, or forgetting that it’s off can cause errors during testing.  C

Residential Pressure Measurement Pressure gauge Troubleshooting

Avoid Problems

 Insert a T in the tube and connect it to one reference port. Connect the other reference port as shown.  Increase the fan speed and compare Channel

Learn to perform a calibration check on a digital gauge. It’s a quick and simple way to verify that the gauge is working correctly.

Cross Port Check 1 2 3 35.2 Pa 35.6 Pa -35.2 Pa -35.6 Pa 35.2 Pa 35.6 Pa

 What is pressure?  The importance of pressure in houses  Get to know your pressure gauge  Using a digital pressure gauge  Pressure gauge tests o

 A moving tube can generate pressure in the tube. ◦ Do not allow tubes to hang in the path of moving air. Move tubes around and notice the effect 8.0

Always wait twice (2X) the time averaging period before taking a reading. Time averaging can lead to false results if the time averaging period is not

 Pinching or squishing a tube causes the measured pressure to increase Pinched tubes

 Water trapped in tube compresses air in the tube, even with auto-zero turned ‘ON’.  Shake out the water to clear the pressure.  A single water dr

 What can cause problems with measurements?

 Selecting the wrong Flow Range, or wrong device can lead to incorrect results. ◦ What happens?

 Some common problems are frequently seen when taking multi-point tests.

Introduction Residential Duct Leakage Measurement rev-2011-02-21

Image Courtesy of The Energy Conservatory Image Courtesy of Retrotec Inc

Residential Pressure Measurement What is Pressure?

Calibrated Fan Flex duct Flex duct flange Flex duct Image Courtesy of Retrotec Inc Image Courtesy of The Energy Conservatory

A DucTester system includes:  DU-220 Fan with 3 flow rings + case  12’ Flex-duct  DM-2A Digital Manometer + bag  Static pressure probe  20’ umbil

Duct Blaster includes:  Duct Blaster fan with 3 flow rings + case  DG-700 Digital Pressure and Flow Gauge  12’ flex duct  Duct Blaster Training vi

Open Ring 1 (A1) Ring 2 (B2) Ring 3 (C3 on gauge) 600-1000 cfm 225-800 cfm 90-300 cfm 10-125 cfm Low Mid Open 5-25 cfm 25-125 cfm 100-600 cfm Minn

5 step, Total duct Pressurization test Residential Duct Leakage Measurement

1. Connect to ducts 2. Prepare ducts and house 3. Connect gauge & fan (pressurization) 4. Measuring 5. No results displayed 5 step, Total duct Pre

Duct testing guides

Step 1: Connect to ducts Image Courtesy of Retrotec Inc Image Courtesy of Retrotec Inc Image Courtesy of The Energy Conservatory Image Courtesy of The

Images Courtesy of The Energy Conservatory

What is Pressure?

Step 2: Prepare ducts and house Image Courtesy of Retrotec Inc

25 Pa 90 cfm

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Fan Pressure Tap Electrical Connection Image Courtesy of The Energy Conservatory

There are two types of pressure that can be measure on a digital gauge.

Turn the gauge On Press: x3 x3 x2 ON/ OFF Press: Press: x2 After being set up once, the gauge will return to the previous settings.

Manually adjust fan speed Image Courtesy of Retrotec Inc Image Courtesy of The Energy Conservatory

Open Mid

Open Ring 1 (A1) Ring 2 (B2) Ring 3 (C3) 600-1000 CFM 225-800 CFM 90-300 CFM 10-125 CFM Open Mid Low 100-600 CFM 25-125 CFM 5-25 CFM Minneapolis Duct

Image courtesy of Retrotec Inc Image courtesy of The Energy Conservatory Image Courtesy of Retrotec Inc -25 Pa 90 cfm

• Not able to reach target pressure • Check covers on all registers • Tape may be being blown off during pressurization • Duct system just too leaky t

 Connect the red and yellow ports.  Both channels should have same reading within 1%.

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Pressurization leakage to outdoors Residential Duct Leakage Measurement

 Stack effects & Wind effects Measure indoor/outdoor bias pressures caused by: -1.0Pa To outside

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After completing the total duct leakage test, a duct leakage to the outdoors test can be completed by adding a door fan to the test setup.  Duct leak

Pressurization to outdoors Image Courtesy of Retrotec Inc 25 Pa 25 Pa 25 Pa 0 Pa 40 cfm 40 cfm

 Duct leakage to outdoors test  The duct leakage to the outdoors test neutralizes air leakage between the duct and interior of the house, by maintai

Pressurization to outdoors – Single gauge 25Pa 100 cfm Image Courtesy of Retrotec Inc 25 Pa 40 cfm 25 Pa 40 cfm

Leak location Residential Duct Leakage Measurement

Duct Simulator setup  Setup the duct simulator with leakage to the house and to the outdoors (with the house simulator tent).  Build your own simula

Large Building Testing Developed by Retrotec Inc.

Guiness World Record 15,000,000 cubic feet

Bias due to wind and stack Bias pressures under windy conditions

Year of Construction Year of Air-barrier retrofit? Number of Stories Floor Area Enclosure Area Tested Permeablity ft2 ft2 cfm/ft2 @75Pa 2011 -

Year of Construction Year of Air-barrier retrofit? Number of Stories Floor Area Enclosure Area Tested Permeablity ft2 ft2 cfm/ft2 @75Pa 2012 -

Acceptable air leakage? For a 4 story building, 120 x 110 x 8 ft, n=0.65 CFM75/ ft2 USA ASHRAE 90.1 Leaky 0.60 USA Washington State 0

Real life test: EMAD Antwerp, Belgium • Envelope Area = 11,250 m2 • 0.601 CFM/ft2 @ 75Pa • 8.22 m3/h/m2

Real life test: BTC South Carolina, USA • Envelope A = 136,820ft2 • 0.08 CFM/ft2 @ 75Pa • 1.5 m3/h/m2

Real life test: Retrotec Vancouver, Canada • Envelope Area = 25,000 ft2 • 0.4 CFM/ft2 @ 75Pa • 7.3 m3/h/m2

Face page and graphs for MFT

Estimating how many fans you need

 Press [Time Avg], until test pressure varies less than 1Pa.  Wait for 2X time average period before taking a reading. ◦ Stabilizes readings

Calculation based on a desired leakage requirement

Calculation using Retrotec’s ‘Number of Fan Calculator’ Spreadsheet

Test Scenarios (“Individual Control” with FanTestic) Developed by Retrotec Inc.

FanTestic software

One Zone: Testing a single-zone enclosure requiring multiple fans. Problem 1

One Zone: Testing a single-zone enclosure requiring multiple fans. Solution

Multiple Zones: Testing multiple zones requiring one fan on each separate zone. (These zones can be adjacent rooms or separated floors) Problem 2

Solution Multiple Zones: Testing multiple zones requiring one fan on each separate zone. (These zones can be adjacent rooms or separated floors)

Multiple Zones: Testing multiple zones requiring multiple fans on each separate zone. (These zones can be adjacent rooms or separated floors) Problem

Multiple Zones: Testing multiple zones requiring multiple fans on each separate zone. (These zones can be adjacent rooms or separated floors) Problem

 Use [@ Pressure] key (if available)  Increase Time Average to minimize fluctuation ◦ Wait at least double the time averaging period before taking a

Multiple Zones: Testing multiple zones requiring multiple fans on each separate zone. (These zones can be adjacent rooms or separated floors) Solution

Connections that work best (Control cables) Developed by Retrotec Inc.

Large Building Testing Exercises Developed by Retrotec Inc.

Imbalanced test fan flow caused by individual set points Click to play video Developed by Retrotec Inc. Exercise 1

Control Cable Control Cable Imbalanced test fan flow caused by individual set points Exercise 1 Red tubes attached with T-connecters

Imbalanced test fan flow caused by individual set points 1. What is the difference between the two Door Fan speeds? (Pick the closest answer) 2%

Imbalanced test fan flow – Solution : common set point Click to play video Developed by Retrotec Inc. Exercise 2

Control Cable Imbalanced test fan flow caused by individual set points Exercise 2 Only 1 gauge controls the speed of both fans