13
RP-HRPD-IOM (07-22) 132210-B
Figure 8. Ductwork Connection Dimensions (Refer to
Table 8. Ductwork Connection Dimensions
Unit Size
Dimension G
*
RP Models
HRPD Models
Inches
Millimeters
125
250
15-1/4
387
150, 175
300, 350
20-3/4
527
200, 225
400
26-1/4
667
250, 300
500, 600
34-1/2
876
350
700
40
1016
400
800
45-1/2
1156
*
See
Discharge Air Temperature Sensor Installation
•
Makeup air options AG3 and AG4 (refer to
Optional Ductstat with Capillary Tubing (Options AG3 and AG4)
section) have a ductstat with a capillary sensor that is factory-installed in the unit discharge .
•
Makeup air options AG8, AG9, AG15, AG17, AG39, AG40, AG41, and AG42 require field-installation of the sensor
in the discharge ductwork .
•
Options AG15 and AG17 include a box and sensor holder . Options AG8, AG9, AG39, and AG41 include a sensor
and mixing tube .
•
On units with option AG40 or AG42, the discharge sensor is field-supplied .
•
Follow the instructions below to install the sensor in the ductwork .
1 . Determine distance of sensor from unit:
a . Ensure that there is sufficient distance from outlet to have good mixture of discharge air temperature .
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.
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):
