REVERSING
VALVE
| MUFFLER |
| COMPR |
| ACCUMULATOR |
| GAS AND OIL |
CK VALVE B |
|
CK VALVE A | HOT GAS |
|
FILTER
DRIER
CK VALVE C
COIL RETURN
BEND END
REFRIGERANT MIXTURE
TO INDOOR
COIL
FROM INDOOR
COIL
LIQUID
LLSV
ANGLE
VALVE
WITH SCHRADER
PORT
Fig. 23 — 541A180 Heating Mode
IX. COIL CLEANING AND MAINTENANCE
This section discusses the cleaning and the maintenance of standard coils and
A. Cleaning Standard Coils
Standard coils can be cleaned with a vacuum cleaner, washed out with low velocity water, blown out with com- pressed air, or brushed (do not use wire brush). Fan motors are dripproof but not waterproof. Do not use acid cleaners.
Clean coil annually or as required by location or outdoor air conditions. Inspect coil monthly and clean as required. Fins are not continuous through coil sections. Dirt and debris may pass through first section and become trapped, restricting airflow. Use a flashlight to determine if dirt or debris has col- lected between coil sections.
Clean coils as follows:
1.Turn off unit power.
2.Remove screws holding rear corner posts and top cover in place. Pivot top cover up 12 to 18 in. and support with a board or other adequate rigid support. See Fig. 24.
3.Remove clips securing tube sheets together at the return bend end of the coil. Carefully spread the ends of the coil rows apart by moving the outer sections. See Fig. 25.
4.Using a water hose or other suitable equipment, flush down between the sections of coil to remove dirt and debris.
5.Clean the remaining surfaces in the normal manner.
6.Reposition outer coil sections. Reinstall clips which secure tube sheets, and replace top cover and rear corner posts.
7.Restore unit power.
B. Cleaning and Maintaining E-Coated Coils
Routine cleaning of coil surfaces is essential to maintain proper operation of the unit. Elimination of contamination and removal of harmful residue will greatly increase the life of the coil and extend the life of the unit. The following maintenance and cleaning procedures are recommended as part of the routine maintenance activities to extend the life of the coil.
Remove Surface Loaded Fibers
Debris such as dirt and fibers on the surface of the coil should be removed with a vacuum cleaner. If a vacuum cleaner is not available, a soft brush may be used. The clean- ing tool should be applied in the direction of the fins. Coil surfaces can be easily damaged (fin edges bent over) if the tool is applied across the fins.
NOTE: Use of a water stream, such as a garden hose, against a surface loaded coil will drive the fibers and dirt into the coil. This will make cleaning efforts more difficult. Surface debris must be completely removed prior to using low veloc- ity clean water rinse.
Periodic Clean Water Rinse
A periodic clean water rinse is very beneficial for coils that are applied in coastal or industrial environments. However, it is very important that the water rinse is made with very low velocity water stream to avoid damaging the fin edges. Monthly cleaning is recommended.
