Carrier 48GH - Manual (Page 20)

The coils are easily cleaned when dry; therefore,
inspect and clean coils either before or after each
cooling season. Remove all obstructions including
weeds and shrubs that interfere with airflow thru
condenser coil. Straighten bent fins with a fin comb.
If coated with dirt or lint, clean the coils with a
vacuum cleaner, using soft brush attachment. Be
careful not to bend fins. If coated with oil or grease,
clean the coils with a mild detergent-and-water
solution. Rinse coils with clear water, using a
garden hose. Be careful not to splash water on
motors, insulation, wiring, or air filter(s). For best
results, spray condenser coil fins from inside to
outside the unit. On units with an outer and inner
condenser coil, be sure to clean between coils. Be
sure to flush all dirt and debris from unit base.
Inspect drain pan and condensate drain line when
inspecting the coils. Clean drain pan and condensate
drain by removing all foreign matter from pan.
Flush pan and drain tube with clear water. Do not
splash water on insulation, motor, wiring, or air
filter(s). If drain tube is restricted, clear it with a
“plumbers snake” or similar probe device.
The bottom of drain tube has a 1/8-in. diameter
hole. This hole is located in portion of the drain
tube that runs thru drain pan. Clean this hole with a
stiff wire that has a 3/8-in. long, 90 degree bend.
Condenser Fan
CAUTION: Keep condenser fea free from all
obstructions to ensnre proper cooUng opera­
tion, Never place articles on top of «nit.
Inspect Ian blades for cracks or bends each year.
Ensure that blades clear the motor by no more
than 1J4 inch. If blade assembly has slipped down
motor shaft, adjust fan position on motor shaft by
loosening setscrew(s), then moving blade assembly
up. Be sure that setscrew(s) is on flat(s) of
shaft before tightening.
Electrical Controls and Wiring — Inspect and
check electrical controls and wiring annually. Be
sure to turn off gas supply and then electrical power
to unit.
Remove control, blower, and compressor com­
partment access panels to locate all electrical
controls and wiring. Check all electrical connections
for tightness. Tighten all screw connections. If any
smoky or burned connections are noticed: dis­
assemble the connection, clean all parts, restrip
wire end, and reassemble connection properly and
securely.
After inspecting electrical controls and wiring,
replace all panels. Start unit, and observe at least
one complete heating cycle and one complete
cooling cycle to ensure proper operation. If dis­
crepancies are observed in either or both operating
cycles, or if a suspected malfunction has occurred.
check each electrical component with proper elec­
trical instrumentation. Refer to unit wiring label
when making these checkouts.
NOTE: Refer to heating and/or cooling sequence
of operation in this publication as an aid in deter­
mining proper control operation.
1 +
4
i_
32
1
16
Fig. 10 — Position of Electrode to Pilot
Refrigerant Circuit — Inspect all refrigerant
tubing connections and unit base for oil accumula­
tions annually. Detecting oil generally indicates a
refrigerant leak.
If oil is detected or if low cooling performance
is suspected, leak-test all refrigerant tubing; using
an electronic leak-detector, halide torch, or liquid-
soap solution. If a refrigerant leak is detected, see
Unit Preparation — REFRIGERANT LEAKS.
If no refrigerant leaks are found and low cooling
performance is suspected,' see Cooling Section
Start-Up and Adjustments — CHECKING AND
ADJUSTING REFRIGERANT CHARGE.
Gas Input — Gas input does not require checking
unless improper heating performance is suspected.
If a problem exists, refer to Heating Section Start-
Up and Adjustments.
Evaporator Airflow — Heating and/or cooling
airflow does not require checking unless improper
performance is suspected. If a problem exists, be
sure that all supply- and return-air grilles are
open and free from obstructions, and that the air
filter is clean. When necessary, refer to Cooling
Section Start-Up and Adjustments — INDOOR
AIRFLOW AND AIRFLOW ADJUSTMENTS
to check system airflow.
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