81
APPLICATION DATA — 524A (cont)
MEDIUM-STATIC DRIVE DATA
*Four belts shipped with unit. Use correct set of 2 belts sized according to the pulley setting.
HIGH-STATIC DRIVE DATA
*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.
UNIT SIZE 524A
072
090
120
150
180
240
300
MOTOR DRIVE
Motor Pulley Pitch Diameter (in.)
3.4-4.4
3.4-4.4
3.4-4.4
3.4-4.4
3.7-4.7
4.3-5.3
4.3-5.3
Pulley Factory Setting
Full Turns Open
2.5
2.5
2.5
2.5
3.0
3.0
3.0
FAN DRIVE
Pulley Pitch Dia (in.)
8.8
8.0
8.0
8.2
8.6
9.4
9.4
Pulley Bore (in.)
1
1
1
1
7
/
16
1
7
/
16
1
7
/
16
1
15
/
16
Belt No. — Section
1—A
1—A
1—A
1—A
1—B
2—B
2—B*
Belt Pitch (in.)
42.3
40.3
40.3
41.3
41.8
41.8
(2) 38.8
(2) 39.8
FAN SPEEDS (rpm)
Factory Setting
764
841
841
820
842
881
881
Range
666-863
733-949
733-949
715-926
742-943
798-984
798-984
Max Allowable Speed (rpm)
1200
1200
1200
1200
1200
1200
1100
Change per
1
/
2
Turn of
Moveable Motor Pulley
Flange
19.7
21.6
21.6
21.1
16.7
15.3
15.3
MAX FULL TURNS FROM
CLOSED POSITION
5
5
5
5
6
6
6
SHAFTS CENTER DISTANCE (in.)
10.44-
12.32
10.44-
12.32
10.44-
12.32
10.44-
12.32
10.44-
12.32
9.16-
10.99
6.67-
9.43
UNIT SIZE 524A
072
090
120
150
180
240
300
MOTOR DRIVE
Motor Pulley Pitch Diameter (in.)
3.4-4.4
3.4-4.4
3.4-4.4
3.7-4.7
4.3-5.3
4.3-5.3
4.3-5.3
Pulley Factory Setting
Full Turns Open
2.5
2.5
2.5
3.0
3.0
3.0
3.0
FAN DRIVE
Pulley Pitch Dia (in.)
7.0
6.0*
6.0
7.4
7.9
7.4
8.6
Pulley Bore (in.)
1
1
1
1
7
/
16
1
7
/
16
1
7
/
16
1
15
/
16
Belt No. — Section
1—A
1—A
1—A
1—B
1—B
2—B
2—B
Belt Pitch (in.)
41.3
37.3
37.3
39.8
39.8
36.8
37.8
FAN SPEEDS (rpm)
Factory Setting
961
1121
1121
979
1060
1118
1024
Range
838-
1084
978-
1200*†
978-
1200†
873-
1096
950-
1171
1014-
1200†
873-
1075
Max Allowable Speed (rpm)
1200
1200
1200
1200
1200
1200
1100
Change per
1
/
2
Turn of
Moveable Motor Pulley
Flange
24.6
28.7
28.7
19.4
18.4
19.4
16.7
MAX FULL TURNS FROM
CLOSED POSITION
5
5
5
6
6
6
6
SHAFTS CENTER DISTANCE (in.)
10.44-
12.32
10.44-
12.32
10.44-
12.32
10.44-
12.32**
9.16-
10.99
8.16-
10.02
6.67-
9.43
50
TF
Q00
4
-012
52
4A0
7
2-
30
0
