Carrier 48TC series, Service And Maintenance Instructions, Page: 8 / 112

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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 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 wa -
ter rinse.
Periodic Clean Water Rinse
A periodic clean water rinse is very beneficial for coils that are ap -
plied in coastal or industrial environments. However, it is very im -
portant that the water rinse is made with a very low-velocity water
stream to avoid damaging the fin edges. Monthly cleaning as de -
scribed below is recommended.
Routine Cleaning of Coil Surfaces
Periodic cleaning with Totaline environmentally sound coil clean -
er is essential to extend the life of coils. This cleaner is available
from Carrier Replacement Components Division as P/N: P902-
0301 for a one gallon (3.8L) container, and P902-0305 for a
5 gallon (18.9L) container. It is recommended that all coils, in -
cluding standard aluminum, pre-coated, copper/copper or E-coat -
ed coils be cleaned with the Totaline environmentally sound coil
cleaner as described below. 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 du -
rability in the environment.
Avoid use of:
• coil brighteners
• acid cleaning prior to painting
• high pressure washers
• poor quality water for cleaning
Totaline environmentally sound coil cleaner is a nonflammable,
hypoallergenic, 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
Clean coil as follows:
1. Turn off unit power and tag the disconnect.
2. Remove the top panel screws on the condenser end of the
unit.
3. Remove the condenser coil corner post. See Fig. 12. To hold
the top panel open, place the coil corner post between the top
panel and center post. See Fig. 13.
4. Remove the screws securing the coil to the compressor plate
and compressor access panel.
5. Remove the fastener holding the coil sections together at the
return end of the condenser coil. Carefully separate the outer
coil section 3 to 4 in. from the inner coil section. See Fig. 14.
6. Use a water hose or other suitable equipment to flush down
between the 2 coil sections to remove dirt and debris. Clean
the outer surfaces with a stiff brush in the normal manner.
7. Secure the inner and outer coil rows together with a field-sup -
plied fastener.
8. Reposition the outer coil section and remove the coil corner
post from between the top panel and center post. Install the
coil corner post and replace all screws.
Fig. 12 — Cleaning Condenser Coil
Fig. 13 — Propping Up Top Panel
Fig. 14 — Separating Coil Sections
EVAPORATOR COILS
The evaporator coil uses the traditional round-tube, plate-fin
(RTPF) technology. Tube and fin construction consists of vari -
ous optional materials and coatings (see Appendix A for model
number nomenclature). Coils are multiple-row. On two-com -
pressor units, the evaporator coil is a face split design, meaning
the two refrigerant circuits are independent in the coil. The bot -
tom portion of the coil will always be circuit A, with the top of
the coil being circuit B.