HE3XRT
Due to continuing product development, specifications are subject to change without notice.
© 2012 RenewAire LLC
134773_005 HE3XRTMan_Jan12.indd Revised 01/2012 www.renewaire.com
Page 11
Measuring Airflow
Equipment Required
• A magnehelic gauge or other device capable of measuring 0
to 1.5 in. water of differential pressure.
• 2 pieces of natural rubber latex tubing, 1/8” ID, 1/16” Wall
works the best. NOTE: Be sure to remove cap from pressure
port before inserting tubing. Insure tubing is well seated
in pressure ports. NOTE: The tubing should extend in the
pressure port approx. 1 inch.
Cross Core Static Pressure Measurement Instructions
• The individual differential static pressures (DSP) can be
measured using the installed pressure ports located in the
front of the units core access doors. NOTE: These ports
have been carefully located on the unit as to give you the
most accurate airflow measurement. NOTE: Do not relocate
pressure ports.
• To read SCFM of Fresh Air (FA) install the “high” pressure side
(+) of your measuring device to the Outside Air (OA) port and
the “low” pressure side (-) to the Fresh Air (FA) port.
• To read SCFM of Room Air (RA) install the “high” pressure
side (+) of your measuring device to the Room Air (RA) port
and the “low” pressure side (-) to the Exhaust Air (EA) port.
• Use the reading displayed on your measurement device to
cross reference the CFM output using the conversion chart.
NOTE: Be sure to replace cap into pressure port when air
flow measuring is completed.
ONLY
RTH, RTF
RA
OA
FA
RTV, RTF
ONLY
RTV, RTR
ONLY
RA
RTH, RTR
FA
ONLY
FRONT
VIEW
E-box
Pressure Taps (4)
EA
Differential Static Across Core DSP vs. CFM
HE3XR
T
DSP 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90 1.00
Fresh Air
(FA)
CFM 830 1250 1670 2080 2500 2920 3330 3750 4160
Room Air
(RA)
CFM 720 1080 1440 1800 2150 2510 2870 3230 3590
HE3XRT Airflow Performance
Motor
HP
Blower
RPM
Turns
Open
External Static Pressure (in. w.g.)
0.00
0.25
0.50
0.75
1.00
1.25
1.50
SCFM
BHP
SCFM
BHP
SCFM
BHP
SCFM
BHP
SCFM
BHP
SCFM
BHP
SCFM
BHP
2
1207
4
2130
1.0
1940
0.8
1695
0.6
1340
0.4
1347
2
2380
1.4
2210
1.2
2005
1.0
1725
0.8
1365
0.5
1488
0
2630
1.9
2470
1.6
2300
1.4
2100
1.2
1800
0.9
1435
0.7
820
0.4
3
(a)
1533
3
2790
2.5
2660
2.3
2500
2.1
2290
1.8
2040
1.6
1765
1.3
1265
1.0
1597
2
2905
2.8
2785
2.6
2630
2.4
2340
2.1
2200
1.9
1955
1.6
1640
1.3
1661
0.5
2810
3.0
2760
2.7
2585
2.5
2365
2.2
2140
1.9
1890
1.6
1692
0
2820
2.9
2665
2.7
2450
2.4
2220
2.1
1980
1.8
5
1686
3
3110
3.5
3000
3.2
2890
3.0
2730
2.7
2520
2.4
2295
2.1
2000
1.8
1764
1.5
3255
4.0
3150
3.7
3045
3.5
2905
3.2
2720
2.9
2520
2.5
2270
2.2
1843
0
3300
4.2
3200
4.0
3075
3.7
2910
3.4
2715
3.0
2500
2.7
(a) Sheaves for 3HP motors can be adjusted from 1688 RPMs at 0 turns to 1400 RPM at 4.5 turns. Operating range shown is best for motor efficiency.
(b) Sheaves for 5HP motors can be adjusted from 1843 RPMs at 0 turns to 1503 RPM at 6.5 turns. However, motor efficiency drops at lower loads.
