Installation
To increase airflow
Loosen variable sheave set screw and turn sheave clockwise.
To decrease airflow
Loosen variable sheave set screw and turn sheave
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
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| Fan speed (RPM) |
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| Standard drive & motor |
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Unit | 6 turns | 5 turns | 4 turns | 3 turns | 2 turns | 1 turns | Closed | |
Open | Open | Open | Open | Open | Open | |||
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TSD/TSH 060 | N/A | 898 | 967 | 1036 | 1105 | 1174 | 1243 | |
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TSD/TSH 072 | N/A | 698 | 751 | 806 | 859 | 913 | 967 | |
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TSD/TSH 090 | N/A | 752 | 806 | 860 | 914 | 968 | 1020 | |
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TSD/TSH 102 | N/A | 688 | 737 | 786 | 835 | 885 | 934 | |
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TSD/TSH 120 | N/A | 782 | 838 | 894 | 950 | 1006 | 1062 | |
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YSD/YSH 060 | N/A | 1036 | 1105 | 1174 | 1243 | 1312 | 1381 | |
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YSD/YSH 072 | N/A | 806 | 860 | 913 | 968 | 1022 | 1074 | |
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YSD/YSH 090 | 859 | 913 | 967 | 1021 | 1075 | 1129 | N/A | |
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YSD/YSH 102 | 786 | 836 | 885 | 934 | 982 | 1032 | N/A | |
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YSD/YSH 120 | 894 | 950 | 1006 | 1062 | 1118 | 1174 | N/A | |
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WSD/WSH 060 | N/A | 898 | 967 | 1036 | 1105 | 1174 | 1243 | |
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WSD/WSH 072 | N/A | 698 | 751 | 806 | 859 | 913 | 967 | |
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WSD/WSH 090 | N/A | 752 | 806 | 860 | 914 | 968 | 1020 | |
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| Fan speed (RPM) |
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| Oversized drive & motor |
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Unit | 6 turns | 5 turns | 4 turns | 3 turns | 2 turns | 1 turns | Closed | |
Open | Open | Open | Open | Open | Open | |||
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TSD/TSH 060 | N/A | 1243 | 1311 | 1379 | 1450 | 1515 | 1588 | |
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TSD/TSH 072 | N/A | 967 | 1021 | 1075 | 1128 | 1183 | 1235 | |
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TSD/TSH 090 | 1112 | 1182 | 1252 | 1322 | 1392 | 1460 | N/A | |
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TSD/TSH 102 | N/A | 971 | 1041 | 1111 | 1181 | 1251 | 1321 | |
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TSD/TSH 120 | 1062 | 1118 | 1174 | 1229 | 1285 | 1341 | N/A | |
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YSD/YSH 060 | - | - | - | - | - | - | - | |
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YSD/YSH 072 | N/A | 967 | 1021 | 1075 | 1128 | 1183 | 1235 | |
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YSD/YSH 090 | 1112 | 1182 | 1252 | 1322 | 1392 | 1460 | N/A | |
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YSD/YSH 102 | N/A | 971 | 1041 | 1111 | 1181 | 1251 | 1321 | |
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YSD/YSH 120 | 1062 | 1118 | 1174 | 1229 | 1285 | 1341 | N/A | |
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WSD/WSH 060 | N/A | 1243 | 1311 | 1379 | 1450 | 1515 | 1588 | |
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WSD/WSH 072 | N/A | 967 | 1021 | 1075 | 1128 | 1183 | 1235 | |
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WSD/WSH 090 | 1112 | 1182 | 1252 | 1322 | 1392 | 1460 | N/A | |
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15 |
