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Table 9A -- Standard Drive Data, 60 Hz — English
UNIT
524J*25A
524J*25H
524J*28A 524J*30A
MOTOR DRIVE
Motor Pulley Pitch Diameter (in.) 3.7---4.7 4.3---5.3 4.3---5.3
Pulley F actory Setting
Full Turns Open
3.0 3.0 3.0
FAN DRIVE
Pulley Pitch Dia (in.) 9.4 11.0 11.0
Pulley Bore (in.) 1
7
/
16
1
15
/
16
1
15
/
16
Belt No. — Section 2—B 2—B
†
2—B
†
Belt Pitch (in.) 41.8
(2) 42.8
(2) 43.8
(2) 42.8
(2) 43.8
FAN SPEEDS (rpm)
Factory Setting 771 752 752
Range 679---863 682---841 674---831
Max Allowable Speed (rpm) 1200 1100 1100
Change per
1
/
2
Turn of
Moveable Motor Pulley
Flange
15.3 13.1 13.1
MAX FULL TURNS FROM
CLOSED POSITION
6 6 6
SHAFTS CENTER DISTANCE (in.) 9.12---10.99 6.67---9.43 6.67---9.43
†
Four beltsshipped with unit. Use correct set of 2 beltssized accordingto the pulley setting.
Table 9B -- Medium--Static Drive Data, 60 Hz — English
UNIT
524J*25A
524J*25H
524J*28A 524J*30A
MOTOR DRIVE
Motor Pulley Pitch Diameter (in.) 4.3---5.3 4.3---5.3 4.3---5.3
Pulley F actory Setting
Full Turns Open
3.0 3.0 3.0
FAN DRIVE
Pulley Pitch Dia (in.) 9.4 9.4 9.4
Pulley Bore (in.) 1
7
/
16
1
15
/
16
1
15
/
16
Belt No. — Section 1—B 2—B
†
2—B
†
Belt Pitch (in.) 41.8
(2) 38.8
(2) 39.8
(2) 38.8
(2) 39.8
FAN SPEEDS (rpm)
Factory Setting 881 881 881
Range 798---984 798---984 798---984
Max Allowable Speed (rpm) 1200 1100 1100
Change per
1
/
2
Turn of
Moveable Motor Pulley
Flange
15.3 15.3 15.3
MAX FULL TURNS FROM
CLOSED POSITION
6 6 6
SHAFTS CENTER DISTANCE (in.) 9.16---10.99 6.67---9.43 6.67---9.43
†
Four beltsshipped with unit. Use correct set of 2 beltssized accordingto the pulley setting.
524J