Carrier 50SS018-060, 50SX024-060 Condenser Coil, Evaporator Coil, and Conden, Condenser Fan

c.Lift wheel from housing. When handling and/or clean- ing blower wheel, be sure not to disturb balance weights (clips) on blower wheel vanes.

d.Remove caked-on dirt from wheel and housing with a brush. Remove lint and/or dirt accumulations from wheel and housing with vacuum cleaner, using soft brush at- tachment. Remove grease and oil with mild solvent.

e.Reassemble wheel and cut-off plate into housing.

f.Reassemble motor into housing. Be sure setscrews are tightened on motor-shaft ¯ats and not on round part of shaft.

Condenser Coil, Evaporator Coil, and Conden-

sate Drain Pan Ð Inspect the condenser coil, evapo- rator coil, and condensate drain pan at least once each year. Proper inspection and cleaning requires the removal of the unit top. See Unit Top Removal section on page 40.

The coils are easily cleaned when dry; therefore, inspect and clean the coils either before or after each cooling sea- son. Remove all obstructions (including weeds and shrubs) that interfere with the air¯ow through the condenser coil. Straighten bent ®ns with a ®n comb. If coated with dirt or lint, clean the coils with a vacuum cleaner, using a soft brush attachment. Be careful not to bend the ®ns. If coated with oil or grease, clean the coils with a mild detergent-and-water solution. Rinse coils with clear water, using a garden hose. Be careful not to splash water on motors, insulation, wiring, or air ®lter(s). For best results, spray condenser-coil ®ns from inside to outside the unit. On units with an outer and inner condenser coil, be sure to clean between the coils. Be sure to ¯ush all dirt and debris from the unit base.

Inspect the drain pan and condensate drain line when in- specting the coils. Clean the drain pan and condensate drain by removing all foreign matter from the pan. Flush the pan and drain tube with clear water. Do not splash water on the insulation, motor, wiring, or air ®lter(s). If the drain tube is restricted, clear it with a ``plumbers snake'' or similar probe device. Ensure that the auxiliary drain port above the drain tube is also clear.

Condenser Fan

Keep the condenser fan free from all obstructions to en- sure proper cooling operation. Never place articles on top of the unit. Damage to unit may result.

1.Remove 2 screws at bottom of condenser air intake grille and remove plastic grille.

2.Inspect the fan blades for cracks or bends.

3.If fan needs to be removed, loosen the setscrew and slide the fan off the motor shaft.

4.When replacing fan blade, position blade so that lead- ing edge is 2 in. back from condenser inlet grille or 1¤2 in. maximum from fan deck. See Fig. 35.

5.Ensure that setscrew engages the ¯at area on the motor shaft when tightening.

Electrical Controls and Wiring Ð Inspect and check the electrical controls and wiring annually. Be sure to turn off the electrical power to the unit.

Remove the control/blower and compressor compartment access panels to locate all the electrical controls and wiring. Check all electrical connections for tightness. Tighten

Fig. 35 Ð Fan Blade Clearance

all screw connections. If any smoky or burned connections are noticed, disassemble the connection, clean all the parts, restrip the wire end and reassemble the connection properly and securely.

After inspecting the electrical controls and wiring, re- place all the panels. Start the unit, and observe at least one complete cooling cycle to ensure proper operation. If dis- crepancies are observed in operating cycle, or if a suspected malfunction has occurred, check each electrical component with the proper electrical instrumentation. Refer to the unit wiring label when making these checkouts.

NOTE: Refer to the Cooling Sequence of Operation section on page 35, as an aid in determining proper control operation.

Refrigerant Circuit Ð Inspect all refrigerant tubing con- nections and the unit base for oil accumulations annually. Detecting oil generally indicates a refrigerant leak.

If oil is detected or if low cooling performance is sus- pected, leak-test all refrigerant tubing using an electronic leak- detector, or liquid-soap solution. If a refrigerant leak is detected, refer to Check for Refrigerant Leaks section on page 27.

If no refrigerant leaks are found and low cooling perfor- mance is suspected, refer to Checking and Adjusting Refrig- erant Charge section on page 27.

Evaporator Air¯ow Ð The cooling air¯ow does not require checking unless improper performance is suspected. If a problem exists, be sure that all supply- and return-air grilles are open and free from obstructions, and that the air ®lter is clean. When necessary, refer to Indoor Air¯ow and Air¯ow Adjustments section on page 34 to check the system air¯ow.

Metering Devices Ð Refrigerant metering devices are ®xed ori®ces and are located in the inlet header to the evapo- rator coil.

Liquid Line Strainer Ð The liquid line strainer (to protect metering device) is made of wire mesh and is located in the liquid line on the inlet side of the metering device.

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