Reinstalling Motor And Fan Assembly; Staged Air Volume; Fan System Re-Assembly; Fan Assembly Install - Carrier 50FC Series Service And Maintenance Instructions

5
7 7
Fig. 13 — Fan System Re-Assembly
3. If required, install stator limit switch on aluminum stator
with two #10 x 5
AL48AM217). Tighten to 50 in.-lb (5.65 Nm).
4. If required, insert composite ring into aluminum stator
where pegs match up with holes.
5. Line up rectangle key way in the center of stator with rect-
angle feature on motor and set stator onto motor.
6. Install four #10-32 x
(P/N: AD07AB126) to connect aluminum stator to motor.
Tighten to 23 in.-lb (2.6 Nm).
7. Fit grommet on motor wire harness into keyhole feature on
the side of the stator and pull wire harness out through
grommet.
8. Install rotor on motor by lining up one of 9 holes on com-
posite rotor with one of 9 holes on motor flange. This can
be done by adjusting motor and the top of the motor hub
and aligning using a 3 /
16
fan rotor down until it is flush with the motor flange.
2
1
/ -in. hex head screws (P/N:
8
1 / -in. hex head machine screws
2
-in. Allen key or similar pin. Press
9. Set retaining rings (x3) into composite rotor and install 6
#10-32 x
AD07AB126) through the holes in retaining rings. Tighten
10
to 23 in.-lb (2.6 Nm). It is recommended this screw instal-
lation be done in a star pattern.
10. Align tabs of composite casing with rectangular cutouts on
top of aluminum stator and snap into place.
11. Final assembly should have a small clearance between top of
plastic rotor and underside of casing lip. Spin rotor by hand
to ensure no contact or rubbing between these two parts.

Reinstalling Motor and Fan Assembly

See Fig. 14.
9
1. Align motor harness/grommet at ~7 o'clock (facing
installer) and align the bottom flats on right and left sides
of fan stator with fan deck ribs. Drop fan assembly down
8
into fan deck opening and slide back until aluminum stator
is under the rear fan deck brackets.
2. Align (if necessary) two front holes and fasten stator to fan
deck with 2 #10 x
AL48AM217). Tighten to 50 in.-lb (5.65 Nm).
3. Reconnect wires for stator temperature limit switch.
4
4. Pull motor harness tight through grommet and plug it in to
the control box harness and secure in the corner with snap-
in wire tie.
6
3
4
2
Fig. 14 — Fan Assembly Install

Staged Air Volume

All 50FC 07 units with EcoBlue™ technology come factory
set to automatically adjust the indoor fan motor speed in se-
quence with the unit's ventilation, cooling, and heating opera-
tion. When the first stage of cooling is requested, unit fan will
operate at 66% of the user set full load airflow. When the sec-
ond stage of cooling is required, UCB will allow the full design
airflow rate for the unit (100%). During the heating mode, the
unit will allow total design airflow rate (100%). During venti-
lation mode, the fan will operate at 66% speed.
See Table 1 on page 5 for 2-Pin DIP switch settings.
9
/ -in. hex head machine screws (P/N:
1
2
5 / -in. hex head screws (P/N:
8
1
3