Carrier 69NT40-561-300, Operation And Service Manual

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T-365 7–16
4. Note the number of shims on each side of the motor as the same configuration will be required to refit the
new motor.
5. Remove the fan motor mounting hardware and remove motor.
6. Loosely mount the new motor using new lock nuts.
7. Connect the fan motor wiring to the new fan motor.
8. Replace the shims in the same configuration as they were removed.
9. Tighten the fan motor mounting bolts to properly secure the motor.
10.To make sure that the motor is aligned properly, slide the condenser fan onto the motor shaft reversed but do
not secure.
11. Rotate the fan to make sure the fan blades do not contact the shroud:
a. If the fan motor is misaligned vertically, add or remove shims to align.
b. If the fan motor is not properly centered, loosen the mounting bolts, and adjust the motor position on the
bracket, and then secure the motor.
12.Remove the condenser fan, and connect the fan motor wiring to the fan motor.
13.Place the condenser fan on the shaft facing the correct direction. Adjust the fan to the correct position,
37mm (1.5”) from the fan shroud, see Figure 7.12 .
14.Use Loctite “H” on the fan set screws, and tighten.
15.Refit the left and right infill panels.
16.Refit the condenser fan grille, ensuring the grille is properly centered around condenser fan.
7.12 FILTER DRIER
To check filter drier:
1. Test for a restricted or plugged filter drier by feeling the liquid line inlet and outlet connections. If the outlet
side feels cooler than the inlet side, then the filter drier should be changed.
2. Check the moisture-liquid indicator if the indicator shows a high level of moisture, the filter drier should be
replaced.
To replace filter drier:
1. Pump down the unit (refer to Section 7.4 ). Evacuate if unit is not equipped with service valves. Then replace
filter drier.
2. Evacuate the low side in accordance with Section 7.6 .
3. After unit is in operation, inspect for moisture in system and check charge.
7.13 EVAPORATOR COIL & HEATER ASSEMBLY
The evaporator section, including the evaporator 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.
7.13.1 Evaporator Coil Replacement
1. Pump unit down. (Refer to Section 7.4 ).
WARNING
!
Always turn OFF the unit circuit breakers (CB-1 & CB-2) and disconnect main power supply
before working on moving parts.