Carrier WEATHERMAKER 39B - Service: Coil Operations; Coil Removal, Reversing, and Handling; Service: Fan Section; Fan Shaft Bearing Replacement

SERVICE
Coil Removal
1. Disconnect piping.
2. Remove coil cover panel.
3. Remove air baffle from both ends of coil on
leaving air side.
4. Remove and discard coil shipping hold-down
bolts from both ends of coil.
5. Slide coil out of unit. Handle cooling coils with
coil face vertical. Handle heating coils with coil
face vertical or horizontal. Lift coils from four
suspension points at corners as close to tube
sheets as possible per Fig. 27.
6. Replace in reverse order.
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Fig. 27 — Handling Coil with Face Vertical
Fan Section Access — All fan section sides, front
and top panels may be removed. The panels to be
removed for fan access will depend on unit
location and the amount of access required. Refer
to Fig. 28.
After removing panels, store them properly to
avoid damage to insulation. Before entering fan
section, protect insulation by placing cardboard or
boards on bottom of fan section to serve as a
walkway.
Fan Shaft Bearing Replacement
]. Remove belt guard, belts, and sheave.
2. Loosen bearing locking collar setscrews.
3. Remove bearing hold-down bolts.
4. Remove bearing and observe the following
precautions:
a. Make certain fan shaft surface is clean
between bearing and end of shaft.
b. Block up fan shaft. Do not let fan shaft
drop on bearing support, or let fan wheel
twist or bind between sides of fan housing.
23
5. Install new bearing and tighten bearing locking
collar setscrews per Table 1 and Fig. 26.
6. Make certain fan wheel does not rub sides of
fan housing after installing new bearings.
7. Recoat fan shaft with a rust inhibitor.
8. Replace sheave, belts, and belt guard.
FRONT PANEL
SCREW DETAIL
HEX HEAD
SCREW(S)
Fig. 28 — Removable Panels for Access to
Fan Section
Fan Shaft Removal
1. Remove fan shaft bearings per Fan Bearing
Replacement.
2. Refer to Fan Section Access and remove panels.
3. Loosen fan wheel setscrews (sizes 040 thru 060)
or fan wheel clamps (sizes 070 thru 140).
4. Block up fan wheels within housings to prevent
dropping when shaft is removed.
5. Remove bearing plates and slide shaft from
unit.
6. Replace shaft in reverse order and replace any
damaged internal insulation. Refer to Fig. 2 or
Table 4.