35
I-EEDU (02-21) 150492-A
NOTES:
• According to the latest edition of AMCA Standard 201, in straight ducts, the air is typically well
mixed a minimum of five equivalent duct diameters from the discharge of the unit with equivalent
duct diameter defined as equal to the square root of 4AB/3.14 (A and B are duct cross-sectional
dimensions).
• Locate the sensor a minimum of 96 inches (2,435 mm) from the outlet of the unit.
• If the length of the discharge duct is less than 8 feet (2.4 meters), a mixing vane is recommended
for mixing the discharge air. Do not mount the sensor in the ductwork after a split in the supply
as this will cause loss of control in the duct that does not house the sensor.
1 . Determine appropriate distance from unit .
a . Ensure that there is sufficient distance from outlet to have good mixture of discharge air temperature .
b . Refer to following formula for calculating sensor placement . This example assumes cross-sectional dimensions
for supply ductwork of 24
×
12 inches (610
×
305 mm):
5
𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒
𝑑𝑑𝑑𝑑𝑒𝑒𝑒𝑒𝑑𝑑𝑑𝑑𝑒𝑒𝑒𝑒
𝑑𝑑𝑑𝑑𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑑𝑑𝑑𝑑𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑
×
�
4 × 12 × 24
3.14
= 96
𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑑𝑑𝑑𝑑ℎ𝑒𝑒𝑒𝑒𝑑𝑑𝑑𝑑
5
𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒
𝑑𝑑𝑑𝑑𝑒𝑒𝑒𝑒𝑑𝑑𝑑𝑑𝑒𝑒𝑒𝑒
𝑑𝑑𝑑𝑑𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑑𝑑𝑑𝑑𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑
×
�
4 × 305 × 610
3.14
= 2435
𝑑𝑑𝑑𝑑𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑑𝑑𝑑𝑑𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑
2 . Determine location and orientation of sensor . Position of sensor in duct is also important—mixing tube shown
in
, DETAIL A is 12 inches (305 mm) long and holder shown in
, DETAIL B extends 9-3/16
inches (233 mm) into ductwork .
a . In horizontal ductwork, position sensor assembly in top-middle of duct, with sensor probe extending vertically
down into center of air stream .
b . In vertical ductwork, position sensor assembly in middle of side of duct that corresponds with top-middle of
discharge outlet .
3 . Turn holder so that element is shielded from direct airflow and will sense air temperature as it flows through holes
in holder .
4 . At selected ductwork location, mark diamond-shaped hole—approximately 1
×
1 inch (25
×
25 mm—required for
sensor holder or round hole required for mixing tube and cut hole no larger than necessary .
5 . For units with electronic modulation option AG8 or AG9 (see
a . Slide mixing tube into ductwork and attach sensor .
b . Connect sensor wires in accordance with wiring diagram .
6 . For units with makeup air option AG15 (see
a . Push element into clip in holder . Determine where sensor wire should enter box and remove knockout .
b . Slide holder into ductwork and secure box portion of holder to ductwork using four field-supplied #6 sheet
metal screws .
c . Attach field-supplied cable connector to box, connect sensor wire, and attach box cover .
