Section 1
Auto-Zone Plus
1-14
Design Guide
Preferred Location
If the trunk ducts are properly
sized for minimum pressure drop,
the location of the static pickup
probe is not particularly critical. It
should ideally be located at right
angles to the airflow in a straight
section of the supply duct
approximately 2/3 the distance of
the total length of the supply duct.
Also the probe should be located
not less than 3 duct diameters
downstream and 2 duct diameters
upstream of any elbow or takeoff.
Fan
RA Sensor
SA Sensor
3D
Min.
2D
Min.
Return Air Duct
Supply
Air
Duct
SP Pickup
Bypass Damper
SP Sensor
Less Than Ideal, But
Acceptable
Since the "ideal" location is often
difficult to find in an installation, a
location in the main trunk where
the tip is not in a "negative
pressure area" (e.g. just
downstream of the inside curve of
an elbow) or an area where the
tube opening is directly impacted
by the velocity of the supply air.
Fan
RA Sensor
SA Sensor
Return Air Duct
Supply Air Duct
SP Pickup
Bypass Damper
SP Sensor
Least Desirable, But
Acceptable
If the supply duct comes directly
from the unit and immediately
splits in opposite directions, the
pressure pickup should be located
ahead of the split, or as close to it
as possible, even if the bypass
damper(s) are located downstream
of the split.
Fan
RA Sensor
SA Sensor
Return Air Duct
Supply Air Duct
Tubing To Be Equal
Length And Size
Bypass Damper
SP Sensor
SP Pickups
Figure 1-3:
Locating the Static Pressure Sensor for Bypass Damper Control
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