Auto-Zone Control Systems Auto-Zone Plus Systems Installation & Operation (Version 03A) - Manual (Page 74)

Section 2
Auto-Zone Plus
2-42 Design Guide
Duct Static Pressure Sensor
The duct static pressure sensor is designed to be mounted at the controller, or on the
ductwork near the pickup tube, and may be connected via its modular plug. If the
sensor is mounted on the ductwork, the modular plug must be cut off and 3-conductor
wire spliced onto the sensor leads. 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. See Figure 1-3 in Section 1 of this
manual for general mounting location information.
Figure 2-31:
Duct Static Pressure Sensor Dimensions
Caution:
Mount the static pressure sensor on a vertical surface with the tube tips
pointing downward. Avoid any kinks or sharp bends in the tubing which
runs from the pickup tube to the sensor.
Warning:
The plastic housing on the sensor is electrically conductive. Avoid
contact with any electrical components. It is acceptable to mount the
sensor on grounded sheet metal such as ductwork, electrical panels,
etc.
OUT
IN
GND UP
(-)LO
0.35"
0.
55
" 1.
00
"
2.2
0"
0.15
" DIA.
0.1
5"
2.9
4"
2.5
0"
0.1
25" (1/8
" T
ubin
g Con
n.)
0.200
"
(3/16" T
ubing
Conn.
)
1.9
5"
0.6
0"
12.
0" APPR
OX
.
1.29"
OUT ( Black)
GND (Green)
IN (Red)
OE
271
S
.P
. S
ens
or