Condenser Fan And Fan Motor - Carrier PrimeLINE 69NT40-561-200 Operation And Service Manual

7.12 CONDENSER FAN AND FAN MOTOR

The condenser fan rotates counter-clockwise (viewed from front of unit). The fan pulls air through the condenser
coil, and discharges the air horizontally through the front of the unit.
7.12.1 Condenser Fan Motor Remove/Replace
Do not remove the condenser fan grille before turning power OFF and disconnecting the power plug.
1. Remove the condenser fan grille, retain all bolts and washers for reuse.
2. Remove the condenser fan by loosening the two set screws.
3. Disconnect the condenser fan motor wiring.
Take necessary steps (place plywood over coil or use sling on motor) to prevent motor from
falling into condenser coil.
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
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.
7.13 WATER-COOLED CONDENSER CLEANING
The water-cooled condenser is of the shell and coil type with water circulating through the cupro-nickel coil. The
refrigerant vapor is admitted to the shell side and is condensed on the outer surface of the coil.
Rust, scale and slime on the water-cooling surfaces inside of the coil interfere with the transfer of heat, reduce sys-
tem capacity, cause higher head pressures and increase the load on the system.
By checking the leaving water temperature and the actual condensing temperature, it can be determined if the con-
denser coil is becoming dirty. A larger than normal difference between leaving condensing water temperature and
actual condensing temperature, coupled with a small difference in temperature of entering and leaving condensing
water, is an indication of a dirty condensing coil.
If the water-cooled condenser is dirty, it may be cleaned and de-scaled.
WARNING
!
CAUTION
!
Figure 7.7.
7–13 T-362