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 45.
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 the soft brush attachment. Be careful not to bend the ®ns. If coated with oil or grease, clean the coils with a mild
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 and 2 screws along sides 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 1¤2 in. in front of fan ori®ce. See Fig. 23.
5.Ensure that setscrew engages the ¯at area on the motor shaft when tightening.
6.Replace grille.
Electrical Controls and Wiring Ð Inspect and check the electrical controls and wiring annually. Be sure to turn off the gas supply, and then the electrical power to the unit.
Remove the control, blower, and compressor compart- ment access panels to locate all the electrical controls and wiring. Check all electrical connections for tightness. Tighten 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 heating cycle and one complete cooling cycle to ensure proper operation. If discrepancies are observed in ei- ther or both operating cycles, 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 heating and/or cooling sequence of op- eration in this publication 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,
If no refrigerant leaks are found and low cooling perfor- mance is suspected, refer to Checking and Adjusting Refrig- erant Charge section on page 35.
Gas Input Ð The gas input does not require checking unless improper heating performance is suspected. If a prob- lem exists, refer to
Evaporator Air¯ow Ð The heating and/or cooling air- ¯ow does not require checking unless improper perfor- mance is suspected. If a problem exists, be sure that all supply- and
Metering Device Ð Acutrol™ Device Ð This me- tering device is a ®xed ori®ce and is located in the header to the evaporator coil.
Liquid Line Strainer Ð The liquid line strainer (to pro- tect metering device) is made of wire mesh and located in the liquid line on the inlet side of the metering device.
47