5
5.2
Manually Controlling the Fan
Gradually increase the fan speed by slowly turning the fan controller clockwise. As
the fan speed increases, the building depressurization displayed on Channel A should
also increase. Continue to increase the fan speed until the building depressurization
shown on Channel A is between –45 and –55 Pa.
6. Channel B will display the one-point 50 Pa leakage estimate. Record this number.
If the leakage estimate is fluctuating more than desired, try changing the time
average setting on the gauge by touching the Time Average menu and choosing
the 5 or 10 second or long-term averaging period.
7. Turn off the blower door fan. If you are using cruise control, this is done by touching the red stop icon in the Gauge app.
8. “-----” or “LOW” appearing on Channel B
• Whenever “-----” or “LOW” appears on Channel B in the Flow @ 50 mode, the gauge can not calculate a reliable leakage
estimate. The messages “-----” and “LOW” appear on Channel B under the following conditions:
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“-----” is continuously displayed when the building test pressure from Channel A is below a minimum value of 10 Pa.
Estimating building leakage results when the test pressure is below this value may result in large errors. If possible,
install a larger flow ring or remove the flow rings to generate more fan flow. Be sure the fan is off when changing
flow rings.
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Channel B reads “LOW” is continuously or LOW alternates with a flow reading when the air flow reading through
the device is unreliable (i.e. you are trying to measure a flow outside of the calibrated range of the test device in
its current configuration). If possible, you should change the test device configuration to match the flow rate being
measured (e.g. install a flow ring or a smaller flow ring). Be sure the fan is off when changing flow rings.
USING THE DG-1000 WITH THE MINNEAPOLIS BLOWER DOOR
