Duct Type and Size Setup Mode
When measuring air velocity, the volume of air or airflow can be dis-
played. This is a calculation based on the duct type and size. For air
flow to be accurate the duct size needs to be entered into the
DC580.
The units of measure used in the duct size can be set by following
the steps outlined in section page 7.
1. Connect a probe to the DC580 and turn it on as outlined earlier.
2. Press the
key to activate duct size entry mode.
3.Use the
key to cycle through the duct type. The types are
round, rectangular, and free area. Select free area if measuring at a
supply or return with an obstruction like a grille. NOTE: The free area
of the duct must be known. This is published by the grille manufac-
turer.
4. Once the duct type is displayed,
=round,
=rectangular, or free
area press the
key to confirm the selection.
Round Duct - Use the
keys to enter the diameter
of the duct. Press the
key to confirm the selection.
Rectangular Duct - Use the
keys to enter the
height (H) of the duct. Press the
key to confirm the selection.
Use the same keys to enter the width (W) of the duct. Press the
key to confirm the selection.
Free Area - Use the
keys to enter the free area of
the duct. Press the
key to confirm the selection.
For more information on free area please see the next page.
8
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