151B0801 R5 3/28/2006
13
TABLE A-3: DIRECT DRIVE BLOWER CHARACTERISTICS
CFM
External Static Pressure – inches w.c.
FURNACE
MODEL
BLOWER
MOTOR
HP
MOTOR
FLA
TEMP.
RISE
(
∆
T)
DIP
SWITCH/SPEED
SETTING
0.20 0.30 0.40 0.50 0.60
High
1477 1411 1316 1267 1215
Med-High 1388 1316 1267 1215 1133
Med-Low 1292 1236 1176 1114 1024
O4HD-091A-12-
FA
½
10-10 DD
7.7
50° - 80°F
Low 1196
1156
1092
1047
977
High
2074 1995 1930 1879 1792
Med-High 1963 1896 1827 1774 1700
Med-Low 1792 1755 1700 1642 1582
O4HD-140A-16-
FA
¾
11-10 DD
12.5
45° - 75°F
Low
1622 1602 1541 1499 1433
0-1-1 1215 1214 1214 1207 1204
1-0-0 1128 1108 1101 1095 1089
1-0-1 988 987 981 978 938
O4HD-091A-V-F
¾
11-10 DD
9.6
50° - 80°F
0-0-0 788 787 781 777 756
1-1-0 1800 1800 1800 1800 1770
1-1-1 1650 1650 1650 1650 1620
0-1-0 1500 1500 1500 1500 1470
O4HD-140A-V-F
¾
11-10 DD
9.6
55° - 85°F
0-1-1 1350 1350 1350 1350 1330
NOTE:
The cfm values listed in the tables above are the same from .20 - .50” static. The motor automatically compensates for changes in duct
static pressure, (within the limits of the motor).
TIP:
These formulae will assist with the design of the ductwork and the determination of airflow delivery:
(
)
(
)
CFM
Bonnet Output
x SystemTemperature Rise
SystemTemperature Rise
Bonnet Output
x CFM
=
=
1085
1085
.
.
