Staged Air Volume - Carrier 48GC 04-06 Series Service And Maintenance Instructions

6. Install four no. 10-32 x 1/2 in. hex head machine screws
(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 in. Allen key or similar pin.
Press fan rotor down until it is flush with the motor flange.
9. Set retaining rings (x3) into composite rotor and install
6 no. 10-32 x 1/2 in. hex head machine screws
(P/N: AD07AB126) through the holes in retaining rings.
Tighten to 23 in.-lb (2.6 Nm). It is recommended this
screw installation 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 2 parts.
5
7 7
Fig. 16 — Fan System Reassembly
Reinstalling Motor and Fan Assembly
See Fig. 17.
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
into fan deck opening and slide back until aluminum stator
is under the rear fan deck brackets.
2. Align (if necessary) 2 front holes and fasten stator to fan
deck with 2 no. 10 x 5/8 in. hex head screws
(P/N: AL48AM217). Tighten to 50 in.-lb (5.65 Nm).
3. Reconnect wires for stator temperature limit switch.
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.
4
10
9
8

Staged Air Volume

4 All GC units with EcoBlue™ technology come factory set to auto-
matically adjust the indoor fan motor speed in sequence with the
unit's ventilation, cooling, and heating operation. When the first
stage of cooling is requested, unit fan will operate at 75% of the
user set full load airflow. When the second stage of cooling is re-
6
quired, 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 ventilation mode, the fan will operate
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at 75% speed.
See Table 1 on page 7 for 2-Pin DIP switch settings.
2
1
11
1
3
2
Fig. 17 — Fan Assembly Install