Figure 6−8 Evaporator Fan Assembly - Carrier 69NT40-561-201 Operation & Service Manual

6.14 EVAPORATOR FAN AND MOTOR ASSEMBLY
The evaporator fans circulate air throughout the con-
tainer by pulling air in the top of the unit. The air is forced
through the evaporator coil where it is either heated or
cooled and then discharged out the bottom of the refrig-
eration unit into the container. The fan motor bearings
are factory lubricated and do not require additional
grease.
6.14.1 Replacing the Evaporator Fan Assembly
WARNING
Always turn OFF the unit circuit breakers
(CB-1 & CB-2) and disconnect main power
supply before working on moving parts.
a. Remove access panel by removing mounting bolts
and TIR locking device. Reach inside of unit and
remove the Ty-Rap securing the wire harness loop.
Disconnect the connector by twisting to unlock and
pulling to separate.
b. Loosen four 1/4-20 clamp bolts that are located on the
underside of the fan deck at the sides of the fan
assembly. Slide the loosened clamps back from the
fan assembly.
c. Slide the fan assembly out from the unit and place on
a sturdy work surface.
6.14.2 Disassemble the Evaporator Fan Assembly
a. Attach a spanner wrench to the two 1/4-20 holes
located in the fan hub. Loosen the 5/8-18 shaft nut by
holding the spanner wrench stationary and turning
the 5/8-18 nut counter-clockwise (see Figure 6−8).
b. Remove the spanner wrench. Use a universal wheel
puller and remove the fan from the shaft. Remove the
washers and key.
c. Remove the four 1/4-20 x 3/4 long bolts that are
located under the fan that support the motor and sta-
tor housing. Remove the motor and plastic spacer.
6.14.3 Assemble the Evaporator Fan Assembly
a. Assemble the motor and plastic spacer onto the stator.
NOTE
When removing the black nylon evaporator fan
blade, care must be taken to assure that the blade
is not damaged. In the past, it was a common prac-
tice to insert a screwdriver between the fan blades
to keep it from turning. This practice can no longer
be used, as the blade is made up of a material that
will be damaged. It is recommended that an impact
wrench be used when removing the blade. Do not
use the impact wrench when reinstalling, as galling
of the stainless steel shaft can occur.
b. Apply Loctite to the 1/4-20 x 3/4 long bolts and torque
to 0.81 mkg (70 inch-pounds).
c. Place one 5/8 flat washer on the shoulder of the fan
motor shaft. Insert the key in the keyway and lubricate
the fan motor shaft and threads with a graphite-oil
solution (such as Never-seez).
T-364
d. Install the fan onto the motor shaft. Place one 5/8 flat
washer with a 5/8-18 locknut onto the motor shaft and
torque to 40 foot-pounds.
Fan
Stator
Figure 6−8 Evaporator Fan Assembly
e. Install the evaporator fan assembly in reverse order
of removal. Torque the four 1/4-20 clamp bolts to
0.81 mkg (70 inch-pounds). Connect the wiring con-
nector.
f. Replace access the panel making sure that the panel
does not leak. Make sure that the TIR locking device
is lockwired.
6.15 EVAPORATOR SECTION CLEANING
Containers and Container units that are exposed to
certain fumigants
corrosion. This corrosion will show up as a white powder
found on the inside of the container and on the reefer
unit evaporator stator and fan deck.
Analyses by Carrier
specialists have identified the white powder as
consisting predominantly of aluminum oxide. Aluminum
oxide is a coarse crystalline deposit most likely the result
of surface corrosion on the aluminum parts within the
container. If left untreated over time, it may build up in
thickness and eventually flake as a light−weight white
powder.
The surface corrosion of aluminum is brought about by
exposure to chemicals such as sulfur dioxide and
possibly other fumigants that are commonly used for
fumigation and protection of some perishable cargo
such as grapes, for example. Fumigation is the process
by which a chemical is released into an enclosed area to
eliminate infestations of insects, termites, rodents,
weeds and soil−born disease.
6−10
Washer
Nut
Screws,
Washers
Protector
Motor
may develop visible surface
Transicold environmental