2. Remove the unit chassis from the sleeve as described in the General Disassembly section of this manual. See Figure 6.
FIGURE 6 - UNIT TO WALL SLEEVE MOUNTING SCREWS

3. Remove each side angle from unit with a 5/16-in. nut driver. See Figure 25.
FIGURE 25 - SIDE ANGLE SCREWS

4. Locate and disconnect wires from the compressor. Label each wire for easy reassembly.
DANGER
For compressors that are known to be damaged: Remove refrigerant prior to disconnecting compressor wires. Damaged hermetic compressor terminals may become loose and eject from the compressor. Wear safety glasses and keep your face away from the area above the terminals when removing compressor wires.
5. For Heat Pump Units - Disconnect the wire plug on the reversing valve and carefully remove the outdoor thermostat capillary from the outdoor coil.

6. With a 5/16-in. nut driver, locate and remove the 8 screws mounting the fan section to the chassis. See Figures 26 and Figure 27.
FIGURE 26 - PARTITION FLANGE SCREWS

FIGURE 27 - FAN SECTION SCREW LOCATIONS

7. Using a flat head screwdriver, gently pry the plastic condenser orifice tabs away from both outdoor coil tube sheets and pull the condenser orifice away as shown in Figure 19. See GENERAL DISASSEMBLY section.
FIGURE 19 - REMOVING CONDENSER ORIFICE

8. Carefully remove the fan section from the chassis by lifting fan section straight up and out. The fan deck is awkward; 2 people may be needed for its removal.

9. Remove the stator from the outdoor coil. See GENERAL DISASSEMBLY section. After cleaning, reassemble by reversing steps 1 - 8.

IMPORTANT: During re-assembly of the fan section, carefully align the rubber seal around the tubing where it passes through the partition.
CLEANING THE INDOOR AND OUTDOOR COILS

CAUTION
Coil fins are sharp and may cut hands. Wear heavy protective gloves when cleaning coils.

1. Use a vacuum cleaner or soft bristle brush to remove surface fibers and dirt from each of the faces of the coil. Both the inner and outer surfaces of the coils must be cleaned. It is important to apply the tool in the same direction of the fins, not against them. Applying the tool against the fins may cause damage (fin edges may bend over).

2. With a tank sprayer or a trigger spray extension tube, spray coil cleaning solution evenly across the coils, making sure coils are thoroughly saturated.

See Figure 28. Refer to instructions on the cleaning solution containers for best results.

Do not use a high pressure sprayer.
FIGURE 28 - CLEANING THE COILS

3. Rinse the coils thoroughly with low-velocity, clean water.

4. Repeat steps 2 and 3.

5. Drain water and cleaning solution that may have collected in the basepan during the cleaning process by carefully tilting the chassis. This allows excess water to flow out of the overflow notches.
CAUTION
Do not set unit on end to drain water from basepan, or at any other time. Oil will drain from the compressor sump, which could cause compressor failure.

6. Thoroughly clean the basepan and drain passages by rinsing with clean water. Be sure all debris is removed from the drain valve. See Figure 29.
FIGURE 29 - BASEPAN SECTION

7. Allow unit components to air dry before reassembling the unit. Once dry, reassemble by reversing Steps 1- 9 from the Accessing Indoor and Outdoor Coils section.
ACCESSING THE INDOOR FAN AND INDOOR FAN SCROLL
Dried debris and build-up on the blower wheel and blower scroll can reduce the efficiency of the unit. To properly access the indoor fan and indoor fan scroll for cleaning, refer to the GENERAL DISASSEMBLY section under To Access Indoor-Air Section Components on page 6.
CLEANING THE INDOOR FAN AND FAN SCROLL
1. Once the indoor fan wheel and the indoor fan scroll have been accessed, proceed with the cleaning instructions detailed below:

2. Insert a piece of 9.5-in. by 9.5-in. cardboard between the blower wheel and the opening in the blower scroll to prevent fungus and other debris from falling into the coil.

3. Bend a soft, spiral wound, long bristle brush, to conform to the inner curve of the blower wheel blades. See Figure 30.

FIGURE 30 - CLEANING INDOOR FAN AND FAN SCROLL

4. Insert the brush into every blower wheel blade and gently brush out dried material.

5. Clean the walls of the blower scroll by carefully brushing with the bristle brush. Vacuum loose debris that may have fallen into the bottom of the scroll during the cleaning process.

6. Use the spray bottle to spray the blower wheel blades and the inner surface of the blower scroll with a 3% solution of hydrogen peroxide to kill any fungus spores. Wipe up excess solution in the bottom of the blower scroll with a clean cloth. See Figure 31.

FIGURE 31 - SPRAYING BLOWER WHEEL BLADES

Reassemble components by reversing the steps used to disassemble the unit as detailed in the GENERAL DISASSEMBLY section under To Access IndoorAir Section Components.
ACCESSING THE HEATER ASSEMBLY
To access the heater assembly for cleaning, perform the following steps:

1. DISCONNECT ALL POWER TO THE UNIT.

2. Remove the unit front panel, the discharge air grille, and the discharge air deck as described and shown in Figure 1 and the GENERAL DISASSEMBLY section.
FIGURE 1 - REMOVING FRONT PANEL

3. Once the discharge air deck is removed, the heater assembly is accessible.
CLEANING THE HEATER ASSEMBLY
Once the heater assembly is accessed, use compressed air to blow off any dust that has accumulated on the heater coils. Do not direct the air at the bi-metal discs of the temperature limit switches. Reassemble the unit by reversing Steps 1 - 3.
CAUTION
Do not touch the heater coils or the temperature limit switches. Touching or depressing the bi-metal discs on the temperature limit switches may affect the set point or cause the secondary temperature limit switch to electrically open, requiring it to be replaced.