Fan And Shaft Removal; Lubrication - Carrier 39LA Installation, Start-Up And Service Instructions Manual

10. Check fan shaft diameter at bearing mount. If worn by
more than .001 in. below nominal, shaft should be re-
placed.
11. Install new bearing, tighten holddown bolts and then
tighten bearing locking collar and setscrews.
12. Make certain fan wheel does not rub sides of fan housing
after installing new bearings.
13. Recoat fan shaft with a rust inhibitor or grease.
14. Replace sheave and belts. Adjust and align as described
in Installation sections on installing sheaves and V-belts.
15. Remove insulation protection.
16. Replace access panels.
17. Restore electrical power.
Fan and Shaft Removal (Fig. 44) —
and shaft may be removed through inlet side of fan housing.
1. Remove drive belts as described in Fan Shaft Bearing Re-
moval on page 36.
2. Block up fan wheel within housing to prevent dropping
when bearing bolts are removed.
3. Loosen and remove bearing holddown bolts.
4. Remove bearing support channels and inlet ring from one
side.
5. Remove fan shaft and fan wheel from unit.
6. Remove fan shaft from fan wheel.
7. Replace shaft and wheel into fan in the reverse order of
their removal.
8. Inspect bearings and if serviceable, replace on shaft.
9. Align fan wheel and shaft assembly in fan scroll. Check
cutoff location if wheel failure damaged cutoff plate. See
Fig. 45.
10. Tighten bearing holddown bolts, bearing setscrews and
shaft setscrews.
11. Field balancing of shaft and wheel is recommended.
IMPORTANT: Replacement shafts must have a diam-
eter tolerance at bearing mount of
Carrier-specified parts are recommended.

Lubrication

MOTORS — Lubricate in accordance with nameplate at-
tached to motor or with manufacturer's recommendations
included with motor.
BEARINGS
Fan Bearings — Lubricate fan bearings every 3 months
with suitable bearing grease. Typical lubricants are given in
Table 13.
Inlet Vane and Outlet Damper Bearings — These bearings
are oil-impregnated. Annually lubricate with a few drops of
nondetergent SAE (Society of Automotive Engineers) 20 oil.
Table 13 — Lubricant Data
MANUFACTURER
Sunoco
Texaco
Texaco
Mobil
*Preferred lubricant because it contains rust and oxi-
dation inhibitors.
The fan wheel
+ .0000
nominal.
– .001
LUBRICANT
Prestige 42
Multipak 2
Regal AFB-2*
Mobilplex EP No. 1
Fig. 44 — Fan Shaft and Bearing Removal
(Unit without IGVs shown)
CUTOFF
39L UNIT SIZE
03
06
08
10
12
15
18
21
25
Fig. 45 — Fan Cutoff Plate Data (in.)
38
CUTOFF CLEARANCE
A B
5 7
6 / /
8 8
8 1
10 3 / 1 1 /
8 2
3 3
9 / 1 /
4 8
3 3
9 / 1 /
4 8
12 1 5 /
8
15 3 / 2
4
15 3 / 2
4
1 11
20 / 2 /
2 16