Setting Airflow - Trane S8X1A026M2PSAB Installer's Manual

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 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.
Model
S8X1B080M4PSAB
S8X2B080M4PSAB
(a) Exapmple 1, 2
(b) Example 1
(c) Example 2
Example 1: S8X2B080M4PSAB (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 4
Example 2: S8X2B080M4PSAA (Default Tap 3 & 7)
• 4 Ton Two Stage Outdoor
18-CE04D1-1D-EN
Furnace Airflow (CFM) Vs. External Static Pressure (in. W.C.)
Tap
0.1
1 633
2 957
3 1220
4 1403
5 1524
6 1684
7 1700
8 1858
9 1967
Clean
Filter
0.3 0.5
297 —
800 719
1080 940
1298 1192
1428 1336
1574 1544
1625 1551
1790 1723
1898 1829
nd
• Total 2 Stage ESP = 0.9" W.C.
st
• Total 1 Stage ESP = 0.6" W.C.
nd
• Required 2 Stage Airflow = 1400 cfm (4T x 350
cfm/ton)
st
• Required 1 Stage Airflow = 1050 cfm (2
airflow x .75)
nd
• New 2 Stage Tap Number = Tap 7 (no change)
st
• New 1 Stage Tap Number = Tap 4
Evaporator
Coil
0.7 0.9
— —
428 213
800 660
1087 (a) 981
1248 1164
1401 1337
1476 (b) 1401 (c)
1656 1589
1760 1691
nd
stage
57