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Installation
15RT-SVX20A-E4
To adjust belt
The fan belts must be inspected
periodically to assure proper unit
operation. Replacement is
necessary if the belts appear frayed
or worn.
Units with dual belts require a
matched set of belts to ensure equal
belt length.
When removing or installing the
new belts, do not stretch them over
the sheaves. Loosen the belts using
the belt tension adjustment bolts on
the motor mounting base.
Once the new belts are installed,
adjust the belt tension.
Table 8 - Motor sheave / Fan speed
Fan speed (RPM)
Standard drive & motor
Unit
6 turns
Open
5 turns
Open
4 turns
Open
3 turns
Open
2 turns
Open
1 turns
Open
Closed
TSD/TSH 060 N/A 898 967 1036 1105 1174 1243
TSD/TSH 072 N/A 698 751 806 859 913 967
TSD/TSH 090 N/A 752 806 860 914 968 1020
TSD/TSH 102 N/A 688 737 786 835 885 934
TSD/TSH 120 N/A 782 838 894 950 1006 1062
YSD/YSH 060 N/A 1036 1105 1174 1243 1312 1381
YSD/YSH 072 N/A 806 860 913 968 1022 1074
YSD/YSH 090 859 913 967 1021 1075 1129 N/A
YSD/YSH 102 786 836 885 934 982 1032 N/A
YSD/YSH 120 894 950 1006 1062 1118 1174 N/A
WSD/WSH 060 N/A 898 967 1036 1105 1174 1243
WSD/WSH 072 N/A 698 751 806 859 913 967
WSD/WSH 090 N/A 752 806 860 914 968 1020
Fan speed (RPM)
Oversized drive & motor
Unit
6 turns
Open
5 turns
Open
4 turns
Open
3 turns
Open
2 turns
Open
1 turns
Open
Closed
TSD/TSH 060 N/A 1243 1311 1379 1450 1515 1588
TSD/TSH 072 N/A 967 1021 1075 1128 1183 1235
TSD/TSH 090 1112 1182 1252 1322 1392 1460 N/A
TSD/TSH 102 N/A 971 1041 1111 1181 1251 1321
TSD/TSH 120 1062 1118 1174 1229 1285 1341 N/A
YSD/YSH 060 -------
YSD/YSH 072 N/A 967 1021 1075 1128 1183 1235
YSD/YSH 090 1112 1182 1252 1322 1392 1460 N/A
YSD/YSH 102 N/A 971 1041 1111 1181 1251 1321
YSD/YSH 120 1062 1118 1174 1229 1285 1341 N/A
WSD/WSH 060 N/A 1243 1311 1379 1450 1515 1588
WSD/WSH 072 N/A 967 1021 1075 1128 1183 1235
WSD/WSH 090 1112 1182 1252 1322 1392 1460 N/A
To increase airflow
Loosen variable sheave set screw
and turn sheave clockwise.
To decrease airflow
Loosen variable sheave set screw
and turn sheave counter-clockwise.