4-10
4.14 REPLACING THE 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
discharged through the evaporator coil where it is either
heated or cooled and then discharged out the bottom of
the refrigeration unit into the container. (Refer to
section 1.4.f.) The fan motor bearings are factory
lubricated and do not require additional grease.
WARNING
Always turn OFF the unit circuit breakers (CB-1
& CB-2) and disconnect main power supply
before working on moving parts.
a. Remove upper access panel (See Figure 1-1) by
removing mounting bolts and T.I.R. locking device.
Reach inside of unit and remove Ty-Rap securing wire
harness loop.
b. Remove the two lower mounting bolts that secure the
motor-fan assembly to the unit. Loosen the two upper
bolts as the motor mount upper holes are slotted.
c. Remove motor, fan, and wiring from unit. Place fan
motor and fan on a support. Remove the wiring and fan.
d. Lubricate fan motor shaft with a graphite-oil
solution (Never-Seez). Apply thread sealer (Loctite H,
brown in color) to the two fan set screws. Install fan on
motor. The evaporator fan locating dimension is shown
in Figure 4-15.
10.79 CM
(4.25 INCHES)
Figure 4-15. Evaporator Fan Locating Dimension
e. Connect wiring per applicable wiring diagram and
install motor and fan assembly in unit. Apply power,
momentarily, to check fan rotation. (Refer to section
1.4.f.) If fan spins backwards, refer to section 4.27 for
two-speed motors.
Replace access panel, making sure panel does not
leak. Make sure T.I.R. locking device is lockwired.
4.15 SERVICING THE EVAPORATOR COIL
HEATERS
WARNING
Before servicing unit, make sure the unit circuit
breakers (CB-1) and the start-stop switch are in
the OFF position. Also disconnect power plug
and cable.
a. Remove the lower access panel (Figure 1-1) by
removing the T.I.R. locking device lockwire and
mounting screws.
b. Determine which heater(s) need replacing by
checking resistance on each heater as shown in section
1.4.e.
c. Remove hold-down clamp securing heaters to coil.
d. Lift the “U” portion of the heater (with opposite end
down and away from coil). Move heater left (or right)
enough to clear the heater end support.
4.16 CONDENSER COIL
The condenser consists of a series of parallel copper
tubes expanded into copper or aluminum fins. The
condenser coil must be cleaned with fresh water or steam,
so the air flow is not restricted. Fan rotation is
counterclockwise when viewed from shaft end of motor.
WARNING
Do not open the condenser fan grille before
turning power OFF and disconnecting power plug.
To Replace Condenser Coil:
a. Store the refrigerant charge in an evacuated
container by attaching a line to the liquid line valve. (See
Figure 1-3 and refer to section 4.1)
b. Remove the condenser coil guard.
c. Unsolder discharge line and remove the line to the
water-cooled condenser (if so equipped).
d. Remove coil mounting hardware and then remove
the coil.
e. Install replacement coil and solder connections.
f. Leak check the coil per section 4.2. Evacuate the unit
per section 4.3 and then, charge the unit with refrigerant
per section 4.4.1.
4.17 CONDENSER FAN AND MOTOR
ASSEMBLY
WARNING
Do not open condenser fan grille before turning
power OFF and disconnecting power plug.
NOTE
The replacement motor should be degreased
and sprayed with a coat of Tectyl before
installing in unit.
The condenser fan rotates counterclockwise (viewed
from front of unit) and pulls air through the the
condenser coil and discharges horizontally through the
front of the unit.
a. Open condenser fan screen guard.
b. Loosen square head set screws (2) on fan. (Thread
sealer has been applied to set screws at installation.)
Then disconnect wiring from motor junction box.
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