Retrotec DU200 DucTester Testing Procedures to meet EnergyStar Standards - Manual (Page 2)

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4.2 Measured duct leakage to outdoors to meet ENERGY STAR standards
If Total Leakage is above 4, perform this test which
measures leakage to outdoors by eliminating leaks
into the house.
Method #1: Set both gauges to 25 Pa
1. Connect the red ports together.
2. Press [Set Pressure] [25] [Enter] on
DucTester then door fan.
3. Press [@] to display the results "@25Pa".
4. When 25 Pa +/– 1 is achieved on both, record
duct leakage to outdoors from the DucTester
gauge.
CFM at 25 Pa per 100 sq. ft. Floor area, sq. ft.
>5 fail Less than 1200
>4 fail More than 1200
Method 1 allows the @ extrapolation function to work,
increases accuracy, and no changes need to be made on
the gauge. It is easier to visualize since both the duct and
house pressure can be seen.
Method 2 does not require connecting a red tube to
outdoors, but can result in errors if @ is turned on.
Measure floor area using ANSI Standard Z765-2003.
Method #2: Set duct to house to 0 Pa
1. Connect the door fan per diagram.
2. With the DucTester off, set the Door Fan to 25
Pa by pressing [Set Pressure] [25] [Enter].
3. Press [@] to remove “@” from the display.
4. Set the DucTester to 0 Pa by pressing [Set
Pressure] [0] [Enter].
5. When 0 Pa +/– 1 is achieved, record duct
leakage to outdoors from the DucTester gauge.
Duct-to-outdoor leaks
are measured by
neutralizing the
pressure difference
between the ducts and
the house, which
allows duct-to-outdoor
leaks to be measured
directly.
Connect green tube
when depressurizing.