A.O. Smith ST1302 Manual page 14

12
Level 2
The following chart illustrates the important
fact of comparing total or maximum horsepower:
High Service
Factor Motor
NEMA
F.L. Std. Motor
HP SF MAX HP
Uprated
1/3 1.75 .58
Uprated
1/2 1.60 .80
Uprated
3/4 1.50 1.13
Uprated
1 1.40 1.40
Uprated
1-1/2 1.30 1.95
High Service
Factor Motor
Higher than
F.L. NEMAS.F.
HP SF MAX HP
Uprated
1/3 1.95 .65
Uprated
1/2 1.90 .95
Uprated
3/4 1.65 1.25
Uprated
1 1.65 1.65
Uprated
1-1/2 1.47 2.20
Uprated
2 1.30 2.60
CAPACITORS
It is recommended that replacement capacitors
be of the same MFD and voltage rating as the
original. If the exact replacement is not avail-
able, it is recommended to use one with a MFD
rating not more than 10% greater. Using one
with a larger value could make the motor run hot
and loose torque. The voltage rating should also
vary only on the high side. In some cases, it will
be necessary to go beyond 10%. Example, if a
370 volt unit is not available, the next rating is
440 volt.
Pump Motors
Low Service
Factor Motor
F.L. Up-Rated
HP SF MAX HP
1/2 1.16 .58
3/4 1.07 .80
1 1.13 1.13
1-1/2 1.00 1.50
2 1.00 2.00
Low Service
Factor Motor
F.L. Up-Rated
HP SF MAX HP
1/2 1.30 .65
3/4 1.27 .95
1 1.25 1.25
1-1/2 1.10 1.65
2 1.10 2.20
2-1/2 1.04 2.60
A.O.Smith