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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 dirtaccumulations 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 flats and not on round part of
shaft.
Condenser Coil, Evaporator Coil, and Conden-
sate Drain Pan —
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 airflow through the condenser coil.
Straighten bent fins with a fin 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 fins. 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 filter(s). For best results, spray condenser-coil fins 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 flush 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 filter(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 flat area on the motor
shaft when tightening.
Electrical Controls and Wiring — 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
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 — 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 Airflow — The cooling airflow 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
filter is clean. When necessary, refer to Indoor Airflow and
Airflow Adjustments section on page 34 to check the system
airflow.
Metering Devices — Refrigerant metering devices are
fixed orifices and are located in the inlet header to the evapo-
rator coil.
Liquid Line Strainer — 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.
Fig. 35 — Fan Blade Clearance
41