North American 2300 and 2400 Coupled and V-Belt Blowers Instructions HANDLING
Sheet 2300-10
If the blower dœs not develop nameplate pressure, check: 1. Blower running backward will develop full pressure at low flow but will lose pressure at higher flow (without overloading motor) because the air has to reverse its direction to get out of the blower case. 2. Operating at high altitude. 3. Handling hot air. 4. Restriction at inlet, such as a long under sized inlet supply duct or a dirty filter. The outlet pressure will be the rated pressure minus the suction at the inlet. 5. Dirty impeller or case. 6. Improper gasket at outlet flange restricting flow. 7. Motor not up to speed due to improper wiring. A high voltage motor lead connection with low voltage supply will cause motor to run slow under load. 8. Motor not up to speed due to lower cycle current than for which the blower is rated. 9. Drive belts loose (on V-belt models). 10. Improper size sheaves (on V-belt models). MAINTENANCE A . Blowers not in service because of shutdown or delay in installation should be operated a few min utes monthly. If power is not available, they should be rotated manually 20 to 30 revolutions weekly to distribute grease over bearing surfaces to prevent rusting. B. Operating Temperature. Bearing temperatures may run from 130 to 190 F (maximum allowable). These temperatures are too high to judge by touch of hand. A thermometer imbedded in putty or similar material should be used to determine outside temperature of pillow block. If ambient temperatures are such that bearing temperature will be above or below the above limits, consult Fives. C. Alignment of Couplings. Follow manufacturer's instruc tions. For long life, any coupling should be aligned as nearly perfect as possible. Any adjustment required for alignment should be made on the motor. D. Belts. REPLACEMENT: V-belts should be replaced in sets, not as individual belts. BELT ALIGNMENT: With belts in place, adjust motor position and move pulleys on shafts for alignment. See Figure 1.
When lifting complete blower, always attach lifting lines to the blower base The use of lifting eyes on motor or case may cause distortion of the unit and resultant misalignment. The lifting eyes supplied on larger motors are for removal of the motor only, and provision for eye on the blower case is only for use if the case is removed. INSTALLATION When bolting a blower to an uneven surface , use shims to prevent distortion. To keep out foreign material , cover inlet and outlet openings during installation. To prevent strain on inlet or outlet connection, use pipe supports and #2947 flexible connections. Check motor leads for proper voltage hook-up before wiring. Check for proper rotation after wiring. If the blower inlet is piped from outside for clean air supply, size the pipe for low pressure loss--not by inlet size. Arrange the outdoor inlet to prevent intake of rain or snow, leaves, dirt or birds. Leave work space around the blower for maintenance of motor, belts, and inlet filter, and for dismantling. If blower is outdoors or exposed to moisture, drill a 1 / 8 " to 1 / 4 " hole in the bottom of the case for drainage. If blower is a multiple stage unit, drill hole below each impeller. If the blower is to stand unused for a long period before installation, the shafts should be manually rotated 20 to 30 revolutions every week to distribute grease over bearing surfaces to prevent rusting. Where storage conditions may lead to condensation, it is advisable to fill split type pillow blocks entirely with grease (in addition to rotating the shafts as suggested above). Before putting the blower in operation, empty pillow blocks and refill 1 / 3 to 1 / 2 full with fresh grease. If the starter cuts out on overload , check: 1. Heaters under rating. 2. Heaters installed in wrong position. 3. Motor leads connected for wrong voltage. 4. One phase of a three phase motor not powered. 5. Too much air being taken from the blower. A turbo blower is designed to build pressure. If more than its air capacity is flowing, the blower will overload its motor, trying to hold its design pressure. The blower will not overload if flow is reduced or shut off. 6. Over-greased bearings.
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