Evaporator Coils - Carrier 48HC D17 Series Service And Maintenance Instructions

EVAPORATOR COILS

Evaporator Coil
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.
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 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 avoiding 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 ensuring a
long life for the coil. Failure to clean the coils can result
in reduced durability in the environment.
When cleaning the coils, avoid the use of the following:
S coil brighteners
S acid cleaning prior to painting
S high pressure washers
S poor quality water for cleaning
Totaline environmentally
non- - flammable, hypoallergenic, non- - bacterial, and a
USDA accepted biodegradable agent that will not harm
coil or surrounding components such as electrical wiring,
painted metal
non- - recommended coil cleaners is strongly discouraged
since coil and unit durability could be affected.
The
Totaline Environmentally Sound Coil Cleaner
Application Equipment
S 2-1/2 gallon (9.6L) garden sprayer
S water rinse with low velocity spray nozzle
CAUTION
EQUIPMENT HAZARD
Failure to follow this caution can 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 of 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.
!
PERSONAL INJURY HAZARD
Failure to follow this caution 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 bodily tissue.
Always direct the water stream away from the body.
Totaline Environmentally Sound Coil Cleaner
Application Instructions
1. Proper eye protection such as safety glasses, gloves
and protective clothing are recommended during
mixing and application.
2. Remove all surface loaded fibers and dirt with a
vacuum cleaner as described above.
3. Thoroughly wet finned surfaces with clean water and
a low velocity garden hose, being careful not to bend
fins.
4. Mix Totaline environmentally sound coil cleaner in a
2- - 1/2 gallon (9.6L) garden sprayer according to the
instructions 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),
10
sound coil cleaner
surfaces, or insulation.
CAUTION
is
Use of