Condenser Coil Cleaning Procedure:

The outdoor coils on all air conditioning equipment will need periodic cleaning. The construction of the outdoor coils is somewhat different than normally anticipated. The construction consists of 2 side-by-side coil slabs with a small gap in between. This small gap can cause debris to become lodged and difficult to remove.

To thoroughly clean these coils the following procedure can be used: 

• Ensure that power to the unit is turned "OFF". WARNING: Failure to disconnect electrical power could result in severe electrical shock or death.
• Raise the top cover over the outdoor section.

• Carefully spread the coils 1 to 2 inches apart.

• Note: It is impossible to properly clean the coil without removing the top cover and splitting the two rows of coils.
• The coil is now ready for the cleaning application: The wash solution is best applied in the reverse direction of the airflow by backflushing downward.

• Reposition the coil and panels, and turn power back on to the unit. 
• This procedure can be followed annually if needed to maintain adequate condenser airflow. 
• Chemicals Required: High Quality Detergent. Note: If the detergent is strongly alkaline (more than pH 8.5) after mixing, it must contain an inhibitor. 
• Suggested detergent brand is "COILOX" (part number CHM00051).

Evaporator and General Coil Cleaning Procedures for Slab Coils: 

1. Disconnect unit power.
   WARNING: Failure to disconnect electrical power could result in severe electrical shock or death.
2. Remove enough panels and parts to gain access to the coil.
3. Straighten coil fins with a fin rake if necessary.
4. Use a soft brush to remove loose debris from both sides of the coil.
5. Mix detergent with water according to the manufacturers instructions. The mixed solution may be heated to a maximum of 150 F to improve its cleansing action. CAUTION: Do not heat the solution to more than 150 F. High temperature liquids sprayed on the outside of the coil will raise the pressure inside the coil, possibly causing the coil to burst.
6. Place the mixed solution in the sprayer. If a high-pressure sprayer is used, note the following:
    a. Minimum nozzle spray angle of 15 degrees.
    b. Spray perpendicular to the coil face.
    c. Keep the nozzle at least 6 inches from the coil.
    d. Do not exceed 600 psi.
7. Spray the leaving side of the coil first, then the entering air side. Allow the solution to stand on the coil for 5 minutes.
8. Rinse both sides of the coil with cool, clean water.
9. If the coil remains dirty, repeat steps 7 and 8.
10. Replace all panels and parts and restore electrical power.

WARNING:

Information in this article is intended for use by individuals possessing adequate backgrounds of electrical and mechanical experience and who comply with all federal, state, and local laws, rules, orders, or regulations related to the installation, service, or repair of a heating or central air conditioning product. Any attempt to install, service, or repair a heating or central air conditioning product may result in personal injury and/or property damage. The manufacturer or seller cannot be responsible for the interpretation of the information contained herein, nor can it assume any liability in connection with its use.