Setting Airflow - Trane S8B1A040M3PSC Installation, Operation And Maintenance 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.
Note: See Airflow Tables section in this document.
Measurements must be made prior to the evaporator coil, if equipped,
and after the filter.
Note: Check out fieldtechhelp.com and search for "Setting Air Flow on
the 9-Tap Motor" to watch a short video.
Model
S8B1B080M4PS
S8X1B080M4PS
S8X2B080M4PS
This is an Example Airflow Table only. See
(a) Exapmple 1, 2
(b) Example 1
(c) Example 2
Example 1: S8X2B080M4PS (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: S8X2B080M4PS (Default Tap 3 & 7)
• 4 Ton Two Stage Outdoor
56
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
"Airflow Tables," p. 20
Clean
Filter
0.3 0.5
297 —
800 719
1080 940
1298 1192
1428 1336
1574 1544
1625 1551
1790 1723
1898 1829
for complete Airflow data.
nd
• Total 2 Stage ESP = 0.9" W.C.
st
• Total 1 Stage ESP = 0.6" W.C.
• Required 2
cfm/ton)
• Required 1
airflow x .75)
nd
• New 2 Stage Tap Number = Tap 7 (no change)
st
• New 1 Stage Tap Number = Tap 4
0.7
—
428
800
1087 (a)
1248
1401
1476 (b)
1656
1760
nd
Stage Airflow = 1400 cfm (4T x 350
st
Stage Airflow = 1050 cfm (2
S8XB-SVX001-1B-EN
Evaporator
Coil
0.9
—
213
660
981
1164
1337
1401 (c)
1589
1691
nd
stage