2 What you will learn What is pressure? The importance of pressure in houses Get to know your pressure gauge Using a digital pressure gauge Pressure gauge tests on houses Pressure gauge troubleshooting
3 What is Pressure? Residential Pressure Measurement
4 What is Pressure?
5 There are two types of pressure that can be measure on a digital gauge.
7 Bias due to wind and stack Bias pressures under windy conditions
8 Press [Time Avg], until test pressure varies less than 1Pa. Stabilizes readings Wait for 2X time average period before taking a reading.
9 Testing in windy weather Use Pressure] key (if available) Increase Time Average to minimize fluctuation Wait at least double the time averaging period before taking a reading Shelter outdoor tube T equal lengths together Move outdoor tube 15 feet from building Cover tube ends with towel
10 Use a wind dampening kit
11 What does taking a baseline do? Take a baseline to negate the effects of bias pressure and wind fluctuations.
12 The measure baseline is automatically subtracted from the displayed readings. 1. Press [Baseline] once. 2. Press [Start] once 3.Wait until number is steady then press [ENTER] once to save. BASE LINE
13 The measured baseline is subtracted from the pressure reading on Channel PrA. 1. Press [Baseline] once 2. Press [Enter] after about 60 seconds.
14 Clearing the Baseline feature on both gauges 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.
17 Gauge field check 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 A and Channel B. Values should be within 1% of each other. Remove the tubes from the two reference ports and attach to the two input ports. Repeat the test.
18 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.
19 Cross Port Check Pa 35.6 Pa Pa Pa Pa 35.6 Pa
20 Move tubes around and notice the effect A moving tube can generate pressure in the tube. Do not allow tubes to hang in the path of moving air. To outside 8.0Pa
22 Time averaging can lead to false results if the time averaging period is not taken into account when measurements are being taken. Always wait twice (2X) the time averaging period before taking a reading.
23 Pinched tubes Pinching or squishing a tube causes the measured pressure to increase
24 Water in tubes = massive errors Water trapped in tube compresses air in the tube, even with autozero turned ON. Shake out the water to clear the pressure. A single water drop can block air pressure readings.
25 What can cause problems with measurements?
26 What happens? Selecting the wrong Flow Range, or wrong device can lead to incorrect results.
27 Some common problems are frequently seen when taking multi-point tests.
29 Image Courtesy of The Energy Conservatory Image Courtesy of Retrotec Inc
30 Flex duct Flex duct Calibrated Fan Image Courtesy of The Energy Conservatory Flex duct flange Image Courtesy of Retrotec Inc
31 Image Courtesy of Retrotec Inc A DucTester system includes: DU-220 Fan with 3 flow rings + case 12 Flex-duct DM-2A Digital Manometer + bag Static pressure probe 20 umbilical Quick Guides 12 roll of Grill Mask Image Courtesy of Retrotec Inc
32 Duct Blaster includes: Duct Blaster fan with 3 flow rings + case DG-700 Digital Pressure and Flow Gauge 12 flex duct Duct Blaster Training video and manual Static pressure probe Sample roll of 8 DuctMask Image Courtesy of The Energy Conservatory
33 Minneapolis Duct Blaster Image Courtesy of The Energy Conservatory Retrotec DucTester Open Ring 1 (A1) cfm cfm Ring 2 (B2) cfm Ring 3 (C3 on gauge) cfm Low Mid Open 5-25 cfm cfm cfm Image Courtesy of Retrotec Inc
34 Residential Duct Leakage Measurement 5 step, Total duct Pressurization test
35 5 step, Total duct Pressurization test 1. Connect to ducts 2. Prepare ducts and house 3. Connect gauge & fan (pressurization) 4. Measuring 5. No results displayed
36 Duct testing guides
37 Step 1: Connect to ducts Image Courtesy of Retrotec Inc Image Courtesy of The Energy Conservatory Image Courtesy of Retrotec Inc Image Courtesy of The Energy Conservatory Image Courtesy of The Energy Conservatory
39 Images Courtesy of The Energy Conservatory
40 Step 2: Prepare ducts and house Image Courtesy of Retrotec Inc
44 25 Pa 90 cfm
45 Image Courtesy of Retrotec Inc
47 Fan Pressure Tap Image Courtesy of The Energy Conservatory Electrical Connection
50 Turn the gauge On Press: ON/ OFF Press: x2 Press: x3 x3 x2 After being set up once, the gauge will return to the previous settings.
51 Manually adjust fan speed Image Courtesy of The Energy Conservatory Image Courtesy of Retrotec Inc
52 Open Mid
54 Minneapolis Duct Blaster Open Ring 1 (A1) CFM CFM Ring 2 (B2) CFM Ring 3 (C3) CFM Retrotec DucTester Open Mid Low CFM CFM 5-25 CFM
55 Image courtesy of The Energy Conservatory -25 Pa 90 cfm Image courtesy of Retrotec Inc Image Courtesy of Retrotec Inc
56 Troubleshooting Not able to reach target pressure Check covers on all registers Tape may be being blown off during pressurization Duct system just too leaky to test accurately Change reference tube location (closer to air handler)
57 Connect the red and yellow ports. Both channels should have same reading within 1%.
58 Image Courtesy of Retrotec Inc
59 Pressurization leakage to outdoors Residential Duct Leakage Measurement
60 Image Courtesy of Retrotec Inc
62 Duct leakage to outdoors setup 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.
63 Pressurization to outdoors 0 Pa 25 Pa 40 cfm Image Courtesy of Retrotec Inc 25 Pa 25 Pa 40 cfm
64 Duct leakage to outdoors test The duct leakage to the outdoors test neutralizes air leakage between the duct and interior of the house, by maintaining a zero pressure difference between the two. The leaks measured on the gauge connected to the duct fan is leakage to the outdoors only.
65 Pressurization to outdoors Single gauge 25Pa 25 Pa 25 Pa 40 cfm 100 cfm 40 cfm Image Courtesy of Retrotec Inc
67 Duct Simulator setup Setup the duct simulator with leakage to the house and to the outdoors (with the house simulator tent). Build your own simulator out of a cardboard box with a hole of a known size
68 Large Building Testing Developed by Retrotec Inc.
69 Guiness World Record 15,000,000 cubic feet
71 average 0.62 Year of Year of Air-barrier Number of Floor Enclosure Construction retrofit? Stories Area Area Tested Permeablity ft2 ft ,882 76, ,882 76, ,882 76,
72 USACE test of 300 buildings 0.17 Year of Year of Air-barrier Number of Floor Enclosure Construction retrofit? Stories Area Area Tested Permeablity ft2 ft average 0.17
73 Acceptable air leakage? For a 4 story building, 120 x 110 x 8 ft, n=0.65 CFM75/ ft 2 USA ASHRAE 90.1 Leaky 0.60 USA Washington State 0.40 cfm/ ft 2 at 75Pa 0.40 UK TS-1Commercial Best Practice 5 m 3 /h/m 2 at 50 Pa 0.36 USA CDA LEED 1.25 in 2 4 Pa/100 ft USA ASHRAE 90.1 Average 0.30 USA USACE cfm/ ft 2 at 75Pa 0.25 USA USACE cfm/ ft 2 at 75Pa 0.15 Looser Tighter UK TS-1Commercial Tight 2 m 3 /h/m 2 at 50 Pa 0.14 CDA R in 2 Pa /100 ft USA ASHRAE 90.1 Tight 0.10
74 Real life test: EMAD Antwerp, Belgium Envelope Area = 11,250 m CFM/ft 75Pa 8.22 m 3 /h/m 2
75 Real life test: BTC South Carolina, USA Envelope A = 136,820ft CFM/ft 75Pa 1.5 m 3 /h/m 2
76 Real life test: Retrotec Vancouver, Canada Envelope Area = 25,000 ft CFM/ft 75Pa 7.3 m 3 /h/m 2
77 Face page and graphs for MFT
79 Estimating how many fans you need
80 Calculation based on a desired leakage requirement
81 Calculation using Retrotec s Number of Fan Calculator Spreadsheet
82 Test Scenarios ( Individual Control with FanTestic) Developed by Retrotec Inc.
83 FanTestic software
84 Problem 1 One Zone: Testing a single-zone enclosure requiring multiple fans.
85 Solution One Zone: Testing a single-zone enclosure requiring multiple fans.
86 Problem 2 Multiple Zones: Testing multiple zones requiring one fan on each separate zone. (These zones can be adjacent rooms or separated floors)
87 Solution Multiple Zones: Testing multiple zones requiring one fan on each separate zone. (These zones can be adjacent rooms or separated floors)
88 Problem 3A Multiple Zones: Testing multiple zones requiring multiple fans on each separate zone. (These zones can be adjacent rooms or separated floors)
89 Problem 3B Multiple Zones: Testing multiple zones requiring multiple fans on each separate zone. (These zones can be adjacent rooms or separated floors)
90 Solution Multiple Zones: Testing multiple zones requiring multiple fans on each separate zone. (These zones can be adjacent rooms or separated floors)
91 Connections that work best (Control cables) Developed by Retrotec Inc.
94 Large Building Testing Exercises Developed by Retrotec Inc.
95 Exercise 1 Imbalanced test fan flow caused by individual set points Developed by Retrotec Inc. Click to play video
96 Control Cable Control Cable Exercise 1 Imbalanced test fan flow caused by individual set points Red tubes attached with T-connecters
97 Exercise 1 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%, 10%, 40% X, 80%. 2. What is the total leakage area? (Pick the closest answer) 10 in 2, 50 in 2 X, 100 in 2, 200 in 2. Developed by Retrotec Inc.
98 Exercise 2 Imbalanced test fan flow Solution : common set point Developed by Retrotec Inc. Click to play video
99 Control Cable Exercise 2 Imbalanced test fan flow caused by individual set points Only 1 gauge controls the speed of both fans
100 Exercise 2 Imbalanced test fan flow Solution : common set point 1. What is the total leakage area (EqLA)? (Pick the closest answer) 10 in 2, 20 in 2, 40 in 2 X, 60 in 2. Developed by Retrotec Inc.
101 Exercise 3 Uneven building test pressures between floors caused by common set point Developed by Retrotec Inc. Click to play video
102 Exercise 3 Uneven building test pressures between floors caused by common set point Only 1 gauge controls the speed of both fans Developed by Retrotec Inc.
103 Exercise 3 Uneven building test pressures between floors caused by common set point 1. What is the pressure of the right Simulator Tent? (Pick the closest answer) 10 Pa, 25 Pa, 50 Pa X, 100 Pa. 2. What is the pressure of the left Simulator Tent? (Pick the closest answer) 10 Pa, 25 Pa X, 50 Pa, 100 Pa. Developed by Retrotec Inc.
104 Exercise 4 Uneven building test pressures between floors Solution: individual set points Developed by Retrotec Inc. Click to play video
105 Exercise 4 Uneven building test pressures between floors Solution: individual set points Developed by Retrotec Inc.
106 Exercise 4 Uneven building test pressures between floors Solution: individual set points 1. What is the flow through the left Simulator Tent? (Pick the closest answer) 20 CFM, 120 CFM, 220 CFM, 320 CFM X. 1. What is the flow through the right Simulator Tent? (Pick the closest answer) 20CFM, 120 CFM X, 220 CFM, 320 CFM. Developed by Retrotec Inc.
107 Exercise 5 Uneven building test pressures between floors Solution: individual set point with manual control Developed by Retrotec Inc. Click to play video
108 Exercise 5 Uneven building test pressures between floors Solution: individual set point with manual control Developed by Retrotec Inc.
109 Exercise 5 Uneven building test pressures between floors Solution: individual set point with manual control 1. What is the flow through the left Simulator Tent? (Pick the closest answer) 20 CFM, 120 CFM, 220 CFM, 320 CFM X. 2. What is the flow through the right Simulator Tent? (Pick the closest answer) 20CFM, 120 CFM X, 220 CFM, 320 CFM. Developed by Retrotec Inc.
for the DG-700 Pressure and Flow Gauge The ENERGY CONSERVATORY DIAGNOSTIC TOOLS TO MEASURE BUILDING PERFORMANCE The Energy Conservatory 2801 21 st Ave. S., Suite 160 Minneapolis, MN 55407 Ph.: (612) 827-1117
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