Blower Assembly Section Removal And Re-Installation - Carrier 40UV075 Installation, Start-Up And Service Instructions Manual

Blower Assembly Section Removal and Re-
installation (see Fig. 25)
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
Be careful with all components during installation, espe-
cially the bearing and plastic blower wheels. Any extreme
force applied to these components can cause unintended
damage and void the unit warranty.
To remove blower assembly:
1. Turn off power to the 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 all front (40UV) or bottom (40UH) panels.
Remove end panels.
3. Remove top panel with
vanes and screens to the side (40UV). Remove ductwork
if required and remove top (40UV) or front (40UH) dis-
charge plenum.
4. Remove / -in. head screws along length of unit that
1
4
secure coil baffle to blower section. See Item 5 in
Fig. 25.
5. Remove four 1 / -in. head screws that connect the blower
4
section sides to the coil section sides. See Item 2 in
Fig. 25.
6. Remove the / -in. head screw from the center of the
1
4
blower deck that attaches the blower deck to the pipe
chase. See Item 1 in Fig. 25.
7. Remove six 1 / -in. head screws attaching coil baffle to
4
coil section. See Item 4 in Fig. 25.
8. Remove the harness connector(s) from the motor.
9. Remove the / -in. head screw from the green ground
1
4
wire that connects the motor to frame if unit has a PSC
(permanent split capacitor) motor. The ECM motors are
grounded through the harness.
10. Remove the two carriage bolts retaining the front brace
to the frame sides. See Item 6 in Fig. 25.
11. Remove the four nuts retaining the blower section to the
back (40UV) or top (40UH) frame. See Item 3 in Fig. 25.
5 / -in. nut driver and set optional
16
12. Remove the two
ing bracket to the pipe chase (40UV,UH150 units only).
See Item 6 in Fig. 26.
13. Remove blower section from frame.
To re-install blower assembly to frame of unit:
1. Re-install blower section into frame assembly.
2. Tighten the four
frame. See Item 3 in Fig. 25.
3. Tighten the two 5
bracket to the pipe chase (40UV,UH150 units only). See
Item 6 in Fig. 26.
4. Re-install two carriage bolts that attach the front brace to
the frame sides. See Item 6 in Fig. 25.
5. Rotate the fan shaft by hand to ensure that fans are
unrestricted and can rotate freely. Check for any fan
obstructions.
6. Re-attach green ground wire that connects the motor to
the frame with /
1
4
The ECM motors are grounded through the harness.
7. Connect harness connector(s) to motor.
8. Re-install the coil baffle using six
attach the coil baffle to the coil section. See Item 4 in
Fig. 25.
9. Re-install the / -in. head screw at center of blower deck
1
4
attaching blower deck to pipe chase. See Item 1 in
Fig. 25.
10. Re-install the four
section sides to the coil section sides. See Item 2 in
Fig. 25.
11. Re-install / -in. head screws along length of the unit,
1
4
securing coil baffle to the blower section. See Item 5 in
Fig. 25.
12. Re-install optional vanes and screens and install top
panel (40UV). Re-install top (40UV) or front (40UH)
discharge plenum and ductwork, if required.
13. Re-install front (40UV) or bottom (40UH) panels. Re-
install end panels. Ensure that tag on each right front
panel (40UV) or middle bottom panel (40UH)
matches unit tag.
14. Restore power to unit.
IMPORTANT: Disassembly order is not as important as
reassembly. The assembly order of the bearing bracket
installation is critical to having a well balanced and
sound blower deck.
35
/ -in. nuts retaining the inboard bear-
5
16
5 / -in. nuts retaining blower section to
16
/ -in. nuts retaining the inboard bearing
16
-in. head screw if unit has a PSC motor.
1 / -in. head screws that
4
1 / -in. head screws holding the blower
4