Carrier 39LH Installation, Start-up And Service Instructions Manual

43Fan Shaft Bearing Removal1. Lock open and tag electrical disconnect.2. Enter through fan section access door or remove panels asrequired.3. Place plywood or other rigid covering on floor to protectinsulation from damage.4. Block wheel so that it will not pinwheel due to naturaldraft through the unit.5. Loosen motor base to frame bolts. Adjust motor to re-lease belt tension so removal of belts is done withoutstretching. Do not stretch belts over sheaves. Damage tobelt can result.6. Remove bolts on bushing of fan shaft sheave, insert boltsin jacking hole provided on bushing and slowly jackbushing from sheave. Then remove bushing on sheave.7. Loosen bearing setscrews and locking collar.8. Remove bearing holddown bolts.9. Remove bearing while observing the followingprecautions:a. Make certain fan shaft surface is not rough orscored. If so, clean up surface with fine emerycloth.b. Add a few drops of oil after cleanup of shaft end.10. Check fan shaft diameter at bearing mount. If worn bymore than .001 in. below nominal, shaft should be re-placed.11. Install new bearing, tighten holddown bolts and thentighten bearing locking collar and setscrews.12. Make certain fan wheel does not rub sides of fan housingafter installing new bearings.13. Recoat fan shaft with a rust inhibitor or grease.14. Replace sheave and belts. Adjust and align as describedin Installation sections on installing sheaves and V-belts.15. Remove insulation protection.16. Replace access panels.17. Restore electrical power.Table 14 — Filter DataCAUTIONIt should not be necessary to drive a new bearing ontoshaft. If light tapping is needed, do not tap against outerrace.39L UNIT SIZE 03 06 08 10 12 15 18 21 25Angle Filter SectionFilter Qty…Size (in.) 2…16x25 4…16x20 2…16x202…16x25 4…16x25 6…16x20 9…16x20 12…16x20 4…16x208…16x254…16x208…16x25Nominal Face Area (sq ft) 5.56 8.89 10.00 11.11 13.33 20.00 26.67 31.11 31.11Filter Mixing Box SectionFilter Qty…Size (in.) 2…16x25 4…16x20 2…16x202…16x25 4…16x25 6…16x20 9…16x20 9…16x20 3…16x206…16x254…16x208…16x25Nominal Face Area (sq ft) 5.56 8.89 10.00 11.11 13.33 20.00 20.00 23.33 31.11Flat Filter SectionFilter Qty…Size (in.) 2…16x16 2…20x20 2…20x25 2…16x251…20x25 3…20x25 6…16x20 3…16x203…20x203…20x253…16x252…16x202…20x202…20x252…16x25Nominal Face Area (sq ft) 3.56 5.56 6.94 9.03 10.42 13.33 15.00 18.75 22.50