Carrier 38E - Manual (Page 19)

5. Remove 2 (015,018) or 4 (024,060) screws at base of
coil (located at end of large vertical wires in coil
support).
6. Lift coil vertically from basepan, place aside carefully.
NOTE: When coil is removed, use opportunity to also
remove liquid line strainer. Strainer location is
identified by label on liquid line.
7. Reverse procedure to reinstall coil.
COIL CLEANING — (See Fig. 28, 29.) For best unit
efficiency, clean outdoor coil prior to start of each heating
or cooling season. Shut off all power to unit if coil is
equipped with louvered casing. Refer to Cabinet Servic­
ing for casing removal procedure. To clean coil:
A CAUTION
Coil fin damage can result in higher operating costs
or compressor damage. Do not use ñame, high-
pressure water, steam, volatile or corrosive cleaners
on fins or tubing.
CREVICE TOOL
Clean coil using vacuum cleaner and its crevice tool.
Move crevice tool vertically, close to area being cleaned,
making sure tool touches only the dirt on the fins and
not the fins. To prevent fin damage, do not scrub fins
with tool or move tool horizontally against fins.
If oil deposits are present, spray coil with ordinary
household detergent. Wait 10 minutes, proceed to
next step.
Using garden hose, spray coil vertically downward with
constant stream of water at moderate pressure. Keep
nozzle at a 15 to 20 degree angle, about 3in. (76 mm)
from coil face and 18 in. (457 mm) from tube. Spray so
debris is washed out of coil. Reinstall louvered casing
if necessary. ,
Restore power to unit.
LIQUID LINE STRAINER — Heating and cooling
models are equipped with a strainer in liquid line. It is
marked with identifying sticker. Strainer picks up harm­
ful debris that may be in system. If it becomes plugged,
system does not perform properly. System pressures
become abnormal and compressor may become very hot
and cycle off on its protection device. If strainer is
plugged, it can be easily removed.
Shut off all power to unit. Bleed off all refrigerant
from system.
A CAUTION
Wear safety glasses and gloves when handling refrig­
erants. Remove fan blades and fan motor to gain
access to liquid line. Cut tubing with midget tubing
cutter near belled connection close to strainer. Peel
off identifying sticker. Unbraze stub.
A CAUTION
Wear safety glasses when brazing. Protect any alumi-
nuih tubing in vicinity ofjoint with wet rag to prevent
overheating. After stub is removed, pull strainer
from line with needle nose pliers. Discard strainer.
Do not install another strainer. Braze liquid line
together using copper coupling. Cut liquid line
between indoor and outdoor units. Install liquid line
filter drier (bifiow drier for heat pump). Evacuate
and charge system. Add charge to compensate for
volume needed by drier. Check for normal system
operation.
VACUUM CLEANER
HOSE
TO 2^ X I OPENINGS ARE IDEAL
Fig. 28 — Crevice Cleaning Tool
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