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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.) 1111
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
5555666
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.) 1111
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
5556666
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
50TFQ004-012
524A072-300