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

Ball Bearing Replacement
40UH200 Units Only) —
units only, Fig. 41 for 40UV150 and 40UH150 units with PSC
motors, Fig. 42 for 40UV150 and 40UH150 units with ECM
motors.
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.
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 re-
move top (40UV) or front (40UH) discharge plenum. For
non-ducted 40UH horizontal units with front double de-
flection discharge grille, remove grille for access to wheel
setscrews. See Fig. 37.
4. Remove ¼ in. head screws along length of unit that se-
cure coil baffle to blower section and remove front coil
baffle. See Item 5 in Fig. 37.
5. Loosen setscrews on all blower wheels (two per wheel).
See Fig. 38 and Fig. 40.
6. Loosen bearing setscrews.
7. Remove wiring harness connector(s) from motor.
8. If unit has ECM motor, remove motor shroud (sheet met-
al cover — Fig. 40, Item 6; Fig. 42, Item 4) by removing
two 5 / in. hex nuts. Do not discard cooling shroud.
16
9. Loosen 5 / in. motor mount (Fig. 40, Item 7; Fig. 41,
16
Item 2; Fig. 42, Item 2), nut (Fig. 40, Item 3; Fig. 41,
Item 5; Fig. 42, Item 6), and bolt (Fig. 40, Item 4; Fig. 41,
Item 4; Fig. 42, Item 5), until motor housing (Fig. 40,
Item 5; Fig. 41, Item 3; Fig. 42, Item 3) moves freely.
10. Slide shaft-coupling-motor assembly (Fig. 38, Items 3, 2,
1; Fig. 40, 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).
(40UV,UH150;
Refer to Fig. 40 for 40UH200
11. Remove 1 / in. bolts (Fig. 38, Item 4; Fig. 40, Item 9) and
2
hex nuts (Fig. 38, Item 7; Fig. 40, Item 1) securing bear-
ing to bearing bracket. Remove bearing (Fig. 38, Item 5;
Fig. 40, Item 8).
12. Install new bearing (Fig. 38, Item 5; Fig. 40, Item 8).
1
Secure with / in. bolts (Fig. 38, Item 4; Fig. 40, Item 9)
2
and hex nuts (Fig. 38, Item 7; Fig. 40, Item 1).
13. Slide shaft-coupling-motor assembly (Fig. 38, Items 3, 2,
1; Fig. 40, Items 5, 2, 10) back into bearing and wheels.
Do not use excessive force. Damage to wheels may
occur.
14. Insert shaft-coupling-motor assembly into wheels until
motor clearance is as specified for motor type (PSC or
ECM). See Fig. 43 or Fig. 36.
15. Ensure that motor shaft is perpendicular to motor blower
endplate. Tighten
Fig. 41, Item 2; Fig. 42, Item 2), nut (Fig. 40, Item 3;
Fig. 41, Item 5; Fig. 42, Item 6), and bolt (Fig. 40, Item 4;
Fig. 41, Item 4; Fig. 42, Item 5), until motor (Fig. 40,
Item 5; Fig. 41, Item 3; Fig. 42, Item 3) is secure.
16. Install motor shroud (sheet metal cover — Fig. 40,
Item 6; Fig. 42, Item 4) using two
ECM motor. Align "window" with receptacles on motor.
Motor control module could overheat and fail if oper-
ated without cooling shroud.
17. Re-attach green ground wire that connects the motor to
1
the frame with /
4
ECM motors are grounded through the harness.
18. Re-attach wiring harness connector(s) to motor.
19. Center each wheel in its respective housing and tighten
wheel setscrews (two for each wheel).
20. Rotate the fan shaft by hand to ensure that fans are
unrestricted and can rotate freely. Check for any fan
obstructions.
21. Remove lockout and operate unit for approximately
60 seconds to let inboard/center bearing mount
self-adjust.
22. Lock out and tag all power supplies to equipment and
controls. Tighten the two bearing setscrews.
23. Reinstall the coil baffle using the six
that attach the coil baffle to the coil section. See Item 5 in
Fig. 37.
1
24. Reinstall / in. head screws along length of unit securing
4
coil baffle to the blower section. See Item 5 in Fig. 37.
25. Reinstall optional vanes and screens and install top panel
(40UV). Reinstall top (40UV) or front (40UH) discharge
plenum and ductwork if required or discharge grille.
26. Reinstall front (40UV) or bottom (40UH) panels. Rein-
stall end panels. Ensure that tag on each right front
panel (40UV) or middle bottom panel (40UH) match-
es unit tag.
27. Restore power to unit.
57
5 / in. motor mount (Fig. 40, Item 7;
16
5
/ in. hex nuts if using
16
in. head screw if unit has a PSC motor.
1
/ in. head screws
4