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UNIT SIZE 524A
MOTOR DRIVE
Motor Pulley Pitch Diameter (in.)
Pulley Factory Setting
Full Turns Open
FAN DRIVE
Pulley Pitch Dia (in.)
Pulley Bore (in.)
Belt No. — Section
Belt Pitch (in.)
FAN SPEEDS (rpm)
Factory Setting
Range
Max Allowable Speed (rpm)
Change per
1
/
Turn of
2
Moveable Motor Pulley
Flange
MAX FULL TURNS FROM
CLOSED POSITION
SHAFTS CENTER DISTANCE (in.)
*Four belts shipped with unit. Use correct set of 2 belts sized according to the pulley setting.
UNIT SIZE 524A
MOTOR DRIVE
Motor Pulley Pitch Diameter (in.)
Pulley Factory Setting
Full Turns Open
FAN DRIVE
Pulley Pitch Dia (in.)
Pulley Bore (in.)
Belt No. — Section
Belt Pitch (in.)
FAN SPEEDS (rpm)
Factory Setting
Range
Max Allowable Speed (rpm)
Change per
1
/
Turn of
2
Moveable Motor Pulley
Flange
MAX FULL TURNS FROM
CLOSED POSITION
SHAFTS CENTER DISTANCE (in.)
*Values for 3-phase motor shown. For single-phase motor, pulley pitch diameter is 7 in.
and resulting fan speed is 837-1096 rpm.
†It is possible to adjust drive so that fan speed exceeds maximum allowable. DO NOT
exceed 1200 rpm.
**575-v unit has a center distance of 9.16-10.99.
APPLICATION DATA — 524A (cont)
MEDIUM-STATIC DRIVE DATA
072
090
3.4-4.4
3.4-4.4
3.4-4.4
2.5
2.5
8.8
8.0
1
1
1—A
1—A
42.3
40.3
764
841
666-863
733-949
733-949
1200
1200
19.7
21.6
5
5
10.44-
10.44-
10.44-
12.32
12.32
12.32
HIGH-STATIC DRIVE DATA
072
090
3.4-4.4
3.4-4.4
3.4-4.4
2.5
2.5
7.0
6.0*
1
1
1—A
1—A
41.3
37.3
961
1121
838-
978-
1084
1200*†
1200†
1200
1200
24.6
28.7
5
5
10.44-
10.44-
10.44-
12.32
12.32
12.32
81
120
150
180
3.4-4.4
3.7-4.7
2.5
2.5
3.0
8.0
8.2
8.6
1
1
/
1
/
7
7
16
1—A
1—A
1—B
40.3
41.3
41.8
841
820
842
715-926
742-943
1200
1200
1200
21.6
21.1
16.7
5
5
6
10.44-
10.44-
12.32
12.32
120
150
180
3.7-4.7
4.3-5.3
2.5
3.0
3.0
6.0
7.4
7.9
1
1
7
/
1
7
16
1—A
1—B
1—B
37.3
39.8
39.8
1121
979
1060
978-
873-
950-
1096
1171
1200
1200
1200
28.7
19.4
18.4
5
6
6
10.44-
9.16-
12.32**
10.99
240
300
4.3-5.3
4.3-5.3
3.0
3.0
9.4
9.4
1
/
1
/
7
15
16
16
16
2—B
2—B*
(2) 38.8
41.8
(2) 39.8
881
881
798-984
798-984
1200
1100
15.3
15.3
6
6
9.16-
6.67-
10.99
9.43
240
300
4.3-5.3
4.3-5.3
3.0
3.0
7.4
8.6
/
1
7
/
1
15
/
16
16
16
2—B
2—B
36.8
37.8
1118
1024
1014-
873-
1200†
1075
1200
1100
19.4
16.7
6
6
8.16-
6.67-
10.02
9.43
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