The minimum cleaning recommendation for indoor and outdoor coils is once per season. To access the coils for a thorough cleaning, it is necessary to remove the Air System. To accomplish this task, perform the following steps:
1. DISCONNECT ALL POWER TO UNIT!
2. Remove the unit chassis from the sleeve as described in the General Disassembly section of this manual. See Figure 6.
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.
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.
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.
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.
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.
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.
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.
