Carrier 38AU Replacing NOVATIONt Condenser Coil, Unit Reliability Hazard, Unit Damage Hazard

oxyacetylene fuel and torch. While the flame temperature for MAPP is lower than that of oxyacetylene (and thus provides more flexibility when working on aluminum), the flame temperature is still higher than the melting temperature of aluminum, so user caution is required. Follow instructions carefully. Use the heat shield.

Replacing NOVATIONt Condenser Coil —

The service replacement coil is preformed and is equipped with transition joints with copper stub tubes. When brazing the connection joints to the unit tubing, use a wet cloth around the aluminum tube at the transition joint. Avoid applying torch flame directly onto the aluminum tubing.

Routine Cleaning of Round-Tube Plate Fin (RTPF) Coils —

Periodic cleaning with Totaline→ environmentally sound coil cleaner is essential to extend the life of RTPF coils. This cleaner is available from Carrier Replacement parts division as part number P902-0301 for a one gallon container, and part number P902-0305 for a 5 gallon container. It is recommended that all RTPF coils be cleaned with the Totaline environmentally sound coil cleaner as described below.

NOTE: Do NOT use Totaline→ environmentally sound coil cleaner, or any other coil cleaner on NOVATION coils. See “NOVATION Coil Cleaning and Maintenance” for instructions on cleaning NOVATION coils.

Coil cleaning should be part of the unit’s regularly scheduled maintenance procedures to ensure long life of the coil. Failure to clean the coils may result in reduced durability in the environment.

Avoid the use of: S coil brighteners

S acid cleaning prior to painting S high pressure washers

S poor quality water for cleaning

Totaline environmentally sound coil cleaner is non-flammable, hypoallergenic, non-bacterial, and a 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.

Totaline Environmentally Sound Coil Cleaner Application Equipment —

S21/2 gallon garden sprayer

S water rinse with low velocity spray nozzle

!CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in corrosion and damage to the unit.

Harsh chemicals, household bleach or acid or basic cleaners should not be used to clean outdoor or indoor coils or any kind. These cleaners can be very difficult to rinse out of the coil and can accelerate corrosion at the fin/tube interface where dissimilar materials are in contact. If there is dirt below the surface of the coil use the Totaline environmentally sound coil cleaner as described above.

!CAUTION

UNIT RELIABILITY HAZARD

Failure to follow this caution may result in 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.

Totaline Environmentally Sound Coil Cleaner Application Instructions:

NOTE: Proper eye protection such as safety glasses is recommended during mixing and application.

1.Turn off unit power.

2.Remove screws holding rear corner post and top cover in place. Pivot top cover up 12 to 18 inches (305 to 457 mm) and support with a rigid support. See Fig. 43.

3.Remove all surface loaded fibers and dirt with a vacu- um cleaner. If a vacuum cleaner is not available, a soft non-metallic bristle brush may be used. In either case, the tool should be applied in the direction of the fins. Coil surfaces can be easily damaged (fin edges can be easily bent over and damage to the coating of a protected coil) if the tool is applied across the fins.

NOTE: Use of a water stream, such as a garden hose, against surface loaded coil will drive the fibers and dirt into the coil, making cleaning efforts more difficult. Surface loaded fibers must be completely removed prior to using low velocity clean water rinse.

4.Using a low velocity garden hose thoroughly wet finned surfaces with clean water. Be careful not to bend the fins.

5.Mix Totaline environmentally sound coil cleaner in a 21/2 gallon garden sprayer according to the instruc- tions included with the cleaner. The optimum solution temperature is 100°F (38°C).

NOTE: Do NOT USE water in excess of 130°F (54°C), as the enzymatic activity will be destroyed.

6.Thoroughly apply Totaline→ environmentally sound coil cleaner solution to all coil surfaces including the finned area, tube sheets and coil headers.

38AU

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