Lubrication — Fan Motors: The fan motors have sealed bearings. No provisions are made for lubrication.
Compressor: The compressor has its own oil supply. Loss of oil due to a leak in the system should be the only
reason for adding oil after the system has been in operation.
Coil Type Identification
38AUM units are available with different coil types. Cleaning methods differ for each type so identifying the coil type is
important. Unit model number and appearance can identify the coil type.
Round--Tube Plate--Fin (RTPF) Type — This construction uses a series of small diameter copper hairpin tubes
running horizontally with vertical plate fins. The plate fins may be aluminum (standard) or copper (optional). Various
optional coatings are also available. These coils are segmented two-row designs.
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: 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:
• Coil brighteners
• Acid cleaning prior to painting
• High pressure washers
• 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 —
• 21/2 gallon garden sprayer
• Water rinse with low velocity spray nozzle
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.
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.
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