6
−
15
T
−
318
6.15.2 Evaporator Heater Replacement
The heaters are wired directly back to the contactor. If a
heater failure occurs during a trip, the heater set
containing that heater may be disconnected at the
contactor.
The next Pre-trip (P1) will detect that a heater set has
been disconnected and indicate that the failed heater
should be replaced. To replace a heater, do the
following:
a. Before servicing unit, make sure the unit circuit break-
ers (CB-1 & CB-2) and the start-stop switch (ST) are
in the OFF position, and that the power plug is discon-
nected.
b. Remove the upper back panel.
c. Determine which heater(s) need replacing by check-
ing resistance of each heater set. Refer to paragraph
2.3 for heater resistance values. Once the set con-
taining the failed heater is determined, cut the splice
connection and retest to determine the actual failed
heater(s).
d. Remove hold-down clamp securing heater(s) to coil.
e. Lift the bent end of the heater (with the opposite end
down and away from coil). Move heater to the side
enough to clear the heater end support and remove.
6.16 EVAPORATOR FAN AND MOTOR ASSEMBLY
The evaporator fans circulate air throughout the
container 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 refrigeration unit into the container. The fan motor
bearings are factory lubricated and do not require
additional grease.
6.16.1 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 (see Figure 2-2) by removing
mounting bolts and T.I.R. locking device. Reach
inside of unit and remove the Ty-Rap securing the
wire harness loop. Unplug 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 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.
6.16.2 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 6-22).
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.
6.16.3 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 0.81mkg (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).
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.
1
2
3
4
5
6
5
7
8
9
1. Stator
2. Flat washer, 1/4
3. Bolt, 1/4-20 x 3/4
4. Locknut, 5/8-18
5. Flat washer, 5/8
6. Impeller Fan
7. Key
8. Mylar Protector
9. Evaporator Motor
Figure 6-22 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
Содержание 69NT40-541-300
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Страница 131: ...7 3 T 318 Based on Drawing 62 66058 Figure 7 2 SCHEMATIC DIAGRAM Units with 3 Phase Evaporator Motors...
Страница 133: ...7 5 T 318 6 Heater FCCH FCCH Figure 7 4 SCHEMATIC DIAGRAM Units with Normal Evaporator Fan Capability...
Страница 134: ...7 6 T 318 FCCH FCCH Figure 7 5 SCHEMATIC DIAGRAM Units with Single Evaporator Fan Capability...
Страница 136: ...7 8 T 318 To ST10 To TRX2 To QC1 To QC1 To QC1 To MC6 CONTROLLER Figure 7 7 SCHEMATIC DIAGRAM Emergency Bypass...
Страница 138: ...7 10 T 318 Based on Drawing 62 66058 Figure 7 9 UNIT WIRING DIAGRAM Units with 3 Phase Evaporator Motors Sheet 1 of 2...
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