70
T-305
2. Remove cushion clamps located on the inlet andout-
let lines.
3. Unbraze the equalizer connection (1/4”), the outlet
connection (5/8”) and then the inlet connection
(3/8”). See Figure 42. Be careful to protect the in-
sulation on the heaters and their wires.
4. Remove insulation (Presstite) from expansion valve
bulb.
5. Unstrap the bulb, located below the center of the
suction line (4 o’clock position), and remove the
valve.
b. Installing the Expansion Valve
1. Clean the suction line with sandpaper before instal-
ling bulb to ensure proper heat transfer. Apply ther-
mal grease to the indentation in the suction line.
2. Strap the thermal bulb to the suction line, making
sure bulb is placed firmly into the suction line. See
Figure 40 for bulb placement.
3. Insulate the thermal bulb.
4. Braze inlet connection to inlet line, see Figure 42.
5. Braze outlet connection to outlet line.
6. Reinstall the cushion clamps on inlet and outlet lines.
7. Braze the equalizer connection to the equalizer line.
8. Check superheat (refer to step 6.14.1).
6.15 EVAPORATOR COIL AND HEATER
ASSEMBLY
The evaporator section, including the coil, should be
cleaned regularly. The preferred cleaning fluid is fresh
water or steam. Another recommended cleaner is
Oakite 202 or similar, following
manufacturer’s
instructions.
The two drain pan hoses are routed behind the
condenser fan motor and compressor. The drain pan
line(s) must be open to ensure adequate drainage.
6.15.1 Evaporator Coil Replacement
a. Pump unit down. (Refer to section 6.4, page 59.)
b. With power OFF and power plug removed, remove
the screws securing the panel covering the evapora-
tor section (upper panel).
c. Disconnect the defrost heater wiring.
d. Disconnect the defrost temperature sensor (see
Figure 2, page 6) from the coil.
e. Remove middle coil support.
f. Remove the mounting hardware from the coil.
g. Unsolder the two coil connections, one at the distribu-
tor and the other at the coil header.
h. After defective coil is removed from unit, remove
defrost heaters and install on replacement coil.
i. Install coil assembly by reversing above steps.
j. Leak check connections per section 6.5. Evacuate
the unit per section 6.6 and add refrigerant charge per
section 6.7.
6.15.2 Evaporator Heater Replacement
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 andcable
are disconnected.
b. Remove the lower access panel (Figure 1, page 5) by
removing the T.I.R. locking device lockwire and
mounting screws.
c. Determine which heater(s) need replacing by check-
ing resistance on each heater. Refer to section 2.3,
page 12 for heater resistance values.
d. Remove hold-down clamp securing heaters 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. To remove the fan and motor
assembly, do the following:
WARNING
Always turn OFF the unit circuit breaker
(CB-1) and disconnect main power supply
before working on moving parts.
a. Remove upper access panel (see Figure 1, page 5)
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. Installfan onmotor.
Locate at dimension shown in Figure 43.
10.79 cm
(4.25 inches)
Figure 43. 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
6.16, page 70 for rotation direction.) If fan spins back-
wards, check capacitors.
f. Replace access panel, making sure panel does not
leak. Make sure that the T.I.R. locking device is
lockwired.
Содержание 69NT40-489-100 Series
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Страница 50: ...26 T 305 Figure 12 Standard Configuration Report...
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Страница 163: ...139 T 305 CFS KA6 CFA1 QC1 FDH HST RRS SINGLE SENSOR ONLY Figure 88 Wiring Diagram Sheet 2 of 2...
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Страница 167: ...143 T 305 Based on drawings 62 10526 Rev and 62 10736 Rev Figure 90 Electrical Schematic CA...
Страница 168: ...144 T 305 ALTERNATE CONFIGURATION Figure 91 Electrical Wiring Diagram Controlled Atmosphere Sheet 1 of 2...
Страница 169: ...145 T 305 F Figure 88 E Figure 88 Figure 91 Electrical Wiring Diagram Controlled Atmosphere Sheet 2 of 2...
Страница 172: ...148 T 305 Figure 93 Electrical Wiring Diagram Sheet 1 of 2 Units not modified to include the N2 Purity Solenoid Valve...
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