Ball Bearing Replacement - Carrier 40UV075 Installation, Start-Up And Service Instructions Manual

Ball Bearing Replacement
40UH200 Units Only)
Refer to Fig. 28 for 40UH200 units only, Fig. 29 for 40UV150
and 40UH150 units with PSC motors, Fig. 30 for 40UV150 and
40UH150 units with ECM motors.
WARNING
Lock out and tag all power supplies to equipment and con-
trols prior to servicing unit. Follow all safety codes. Failure
to do so could result in personal injury.
CAUTION
The assembly order of the bearing installation is critical. Be
careful with all components during removal and installa-
tion. Any excessive force applied to these components can
cause unintended damage and void unit warranty.
To replace ball bearing:
1. Turn off all power to unit.
IMPORTANT: Tag each right front panel (40UV) or
middle bottom panel (40UH) for each unit. Panels have
electrical information specific to each unit.
2. Remove front (40UV) or bottom (40UH) panels and
right (motor end) end panel.
3. Remove top panel and set optional vanes and screens to
the side (40UV). Remove ductwork if required and
remove top (40UV) or front (40UH) discharge plenum.
For non-ducted 40UH horizontal units with front double
deflection discharge grille, remove grille for access to
wheel setscrews. See Fig. 25.
4. Remove 1 / -in. head screws along length of unit that
4
secure coil baffle to blower section and remove front coil
baffle. See Item 5 in Fig. 25.
5. Loosen setscrews on all blower wheels (two per wheel).
See Fig. 26 and Fig. 28.
6. Loosen bearing setscrews.
7. Remove wiring harness connector(s) from motor.
8. If unit has ECM motor, remove motor shroud (sheet
metal cover — Fig. 28, Item 6; Fig. 30, Item 4) by
removing two 5 / -in. hex nuts. Do not discard cooling
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shroud.
9. Loosen 5 / -in. motor mount (Fig. 28, Item 7; Fig. 29,
16
Item 2; Fig. 30, Item 2), nut (Fig. 28, Item 3; Fig. 29,
Item 5; Fig. 30, Item 6), and bolt (Fig. 28, Item 4; Fig.
29, Item 4; Fig. 30, Item 5), until motor housing (Fig. 28,
Item 5; Fig. 29, Item 3; Fig. 30, Item 3) moves freely.
10. Slide shaft-coupling-motor assembly (Fig. 26, Items 3, 2,
1; Fig. 28, Items 5, 2, 10) out of wheels and unit until
shaft clears inboard/center bearing assembly (30-in. max
clearance required from edge of frame end).
11. Remove
(40UV,UH150;
12. Install new bearing (Fig. 26, Item 5; Fig. 28, Item 8).
13. Slide shaft-coupling-motor assembly (Fig. 26, Items 3, 2,
14. Insert shaft-coupling-motor assembly into wheels until
15. Ensure that motor shaft is perpendicular to motor blower
16. Install motor shroud (sheet metal cover - Fig. 28, Item 6;
17. Re-attach green ground wire that connects the motor to
18. Re-attach wiring harness connector(s) to motor.
19. Center each wheel in its respective housing and tighten
20. Rotate the fan shaft by hand to ensure that fans are
21. Remove lockout and operate unit for approximately
22. Lock out and tag all power supplies to equipment and
23. Re-install the coil baffle using the six
24. Re-install
25. Re-install optional vanes and screens and install top
26. Re-install front (40UV) or bottom (40UH) panels. Re-
27. Restore power to unit.
40
/ -in. bolts (Fig. 26, Item 4; Fig. 28, Item 9)
1
2
and hex nuts (Fig. 26, Item 7; Fig. 28, Item 1) securing
bearing to bearing bracket. Remove bearing (Fig. 26,
Item 5; Fig. 28, Item 8).
Secure with 1 / -in. bolts (Fig. 26, Item 4; Fig. 28, Item 9)
2
and hex nuts (Fig. 26, Item 7; Fig. 28, Item 1).
1; Fig. 28, Items 5, 2, 10) back into bearing and wheels.
Do not use excessive force. Damage to wheels may
occur.
motor clearance is as specified for motor type (PSC or
ECM). See Fig. 31 or Fig. 24.
endplate. Tighten 5 / -in. motor mount (Fig. 28, Item 7;
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Fig. 29, Item 2; Fig. 30, Item 2), nut (Fig. 28, Item 3;
Fig. 29, Item 5; Fig. 30, Item 6), and bolt (Fig. 28, Item
4; Fig. 29, Item 4; Fig. 30, Item 5), until motor (Fig. 28,
Item 5; Fig. 29, Item 3; Fig. 30, Item 3) is secure.
Fig. 30, Item 4) using two 5
motor. Align "window" with receptacles on motor.
Motor control module could overheat and fail if oper-
ated without cooling shroud.
the frame with 1 / -in. head screw if unit has a PSC motor.
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The ECM motors are grounded through the harness.
wheel setscrews (two for each wheel).
unrestricted and can rotate freely. Check for any fan
obstructions.
60 seconds to let inboard/center bearing mount
self-adjust.
controls. Tighten the two bearing setscrews.
that attach the coil baffle to the coil section. See Item 4 in
Fig. 25.
/ -in. head screws along length of unit secur-
1
4
ing coil baffle to the blower section. See Item 5 in
Fig. 25.
panel (40UV). Re-install top (40UV) or front (40UH)
discharge plenum and ductwork if required or discharge
grille.
install end panels. Ensure that tag on each right front
panel (40UV) or middle bottom panel (40UH)
matches unit tag.
/ -in. hex nuts if using ECM
16
1 / -in. head screws
4