86
A951X-SVX001-1D-EN
Setting Airflow
With all ductwork connected and a clean filter in place, measure the
External Static Pressure (ESP) of the unit in locations below. Use the
appropriate airflow table in the Airflow Tables section for the furnace
and outdoor unit installed.
Measurements must be made prior to the evaporator coil, if equipped,
and after the filter.
Note: Check out fieldtechhelp.com to watch a short video.
E
vaporator
Coil
Clean
Filter
A951X080BU4 Furnace Airflow (CFM) at. External Static Pressure (in. W.C.) versus Tap
Static
0.1 0.3 0.5 0.7 0.9
Tap
1
SCFM / Watts 911 / 94 766 / 104 622 / 115 477 / 125 332 / 136
2
SCFM / Watts 1075 / 139 963 / 153 851 / 168 740 / 182 628 / 197
3
SCFM / Watts 1215 / 185 1121 / 202 1028 / 219 934 / 236 840 / 253
4
SCFM / Watts 1250 / 203 1164 / 221 1077
(a)
/ 239 990 / 257 903 / 274
5
SCFM / Watts 1349 / 251 1272 / 271 1194 / 291 1116
(a)
/ 310 1039 / 330
6
SCFM / Watts 1453 / 313 1387 / 335 1321 / 356 1254 / 378 1188 / 400
7
SCFM / Watts 1505 / 340 1438 / 362 1372 / 384 1305 / 406 1239 / 427
8
SCFM / Watts 1657 / 453 1597 / 477 1538 / 500 1479 / 524 1419 / 547
9
SCFM / Watts 1878 / 669 1815 / 686 1752 / 702 1690 / 718 1627 / 735
(a)
Example 1
Example 1: A951X080BU4SAB (Default Tap 7)
Cooling / HP
• 3 Ton Single Stage Outdoor
• Total ESP = 0.7” W.C.
• Required Airflow = 1050 cfm (3T x 350 cfm/ton)
• New Tap Number = Tap 5 (Re-check static pressure
and adjust airflow as necessary)
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