WeatherMaker® Standard-Efficiency Single-Packaged Rooftop Units 50TC: Monthly Cleaning and Maintenance

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 a very low−velocity water stream to avoid damaging the fin edges. Monthly cleaning as described below is recommended.

CAUTION

UNIT DAMAGE HAZARD

Failure to follow this CAUTION can result in reduced unit performance or unit shutdown.

Use only the recommended approved cleaning procedures for proper system performance.

Routine Cleaning of Coil Surfaces

Periodic cleaning with Totaline environmentally sound coil cleaner is essential to extend the life of coils. This cleaner is available from Carrier Replacement Components Division as p/n: P902- 0301 for one-gallon (3.8L) container, and P902- 0305 for a 5-gallon (18.9L) container. It is recommended that all coils, including standard aluminum, pre−coated, copper/copper or E−coated coils be cleaned with the Totaline environmentally sound coil cleaner as described below. Coil cleaning should be part of the unit

Totaline environmentally sound coil cleaner is a nonflammable, hypo allergenic, non bacterial, USDA accepted biodegradable agent that will not harm the coil or surrounding components such as electrical wiring, painted metal surfaces, or insulation. Use of non−recommended coil cleaners is strongly discouraged since coil and unit durability could be affected.

Two−Row Coils

EVAPORATOR COILS

The evaporator coil uses the traditional round-tube, plate-fin (RTPF) technology. Tube and fin construction consists of various optional materials and coatings (see APPENDIX I. MODEL NUMBER NOMENCLATURE). Coils are multiple-row. On two-compressor units, the evaporator coil is a face split design, meaning the two refrigerant circuits are independent in the coil. The bottom portion of the coil will always be circuit A, with the top of the coil being circuit B.

Coil Maintenance and Cleaning Recommendation

Routine cleaning of coil surfaces is essential to maintain proper operation of the unit. Elimination of contamination and removal of harmful residues 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.

Removing Surface Loaded Fibers

Surface loaded fibers or dirt should be removed with a vacuum cleaner. If a vacuum cleaner is not available, a soft non- metallic bristle brush can be used. In either case, the tool should be applied in the direction of the fins. Coil surfaces can be easily damaged. Applying the tool across the fin edges can cause the edges to be easily bent over, damaging the coating of a protected coil.

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-loaded fibers must be completely removed prior to using a low-velocity clean water rinse. A vacuum cleaner or a soft- bristled brush should be used to remove surface-loaded fibers and dirt.

Periodic Clean Water Rinse

A periodic clean-water rinse is very beneficial for coils that are used in coastal or industrial environments. However, it is very important that the water rinse is made with a very low-velocity water stream to avoid damage to the fin edges. Monthly cleaning, as described below, is recommended.

Routine Cleaning of Evaporator Coil Surfaces

Monthly cleaning with Totaline environmentally sound coil cleaner is essential to extend the life of the coils. This cleaner is available from Carrier Replacement Parts Division (p/n: P902- 0301 for one-gallon (3.8L) container, and p/n: P902- 0305 for a 5-gallon (18.9L) container). It is recommended that all round tube coils be cleaned as described below. Coil cleaning should be part of the unit’s regularly scheduled maintenance procedures to ensure a long life for the coil. Failure to clean the coils can r

Totaline environmentally sound coil cleaner is a nonflammable, hypo allergenic, non bacterial, USDA accepted biodegradable agent that will not harm the coil or surrounding components such as electrical wiring, painted metal surfaces, or insulation. Use of non−recommended coil cleaners is strongly discouraged since coil and unit durability could be affected.

WARNING

PERSONAL INJURY HAZARD Failure to follow this WARNING can result in severe personal injury and reduced unit performance. High−velocity water from a pressure washer, garden hose, or compressed air should never be used to clean a coil. The force of the water or air jet will bend the fin edges and increase airside pressure drop. High−velocity water from a pressure washer can cause severe injury upon contact with exposed body tissue. Always direct the water stream away from the body.