Carrier 542E - Manual (Page 18)

TABLE IX-TROUBLESHOOTING CHART-COOLING CYCLE
ally. Be sure to disconnect the electrical power to the unit.
Remove the control, blower, and compressor compartment
access panels to locate all the electrical controls and wiring.
Check all electrical connections for tightness. Tighten all
screw connections. If any smoky or burned connections are
noticed: disassemble the connection, clean all the parts,
restrip the wire end, and reassemble the connection properly
and securely.
After inspecting the electrical controls and wiring, replace
all the panels. Start the unit, and observe at lease one com­
plete cooling cycle and one complete heating cycle (tem­
perature permitting) to ensure proper operation. If discre­
pancies are observed or a suspected malfunction has
occured, check each electrical component with the proper
electrical instrumentation. Refer to the unit wiring label
when making these checkouts.
NOTE: Refer to the sequences of operation in this publica­
tion as an aid in determining proper control operation.
H. Refrigerant Circuit
Inspect all refrigerant tubing connections and the unit base
for oil accumulations annually. Detecting oil genrally indi­
cates a refrigerant leak.
If oil is detected or if diminished 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 Section V, part B,
“Refrigerant Leaks,” in this publication.
If no refrigerant leaks are found and diminished perfor­
mance is suspected, see Section VI, part B, “Checking and
Adjusting Refrigerant Charge,” in this publication.
I. Indoor Airflow
The indoor airflow does not require checking unless
improper performance is suspected. If a problem exists, he
sure that all supply-and return-air grilles ae open and free
from obstructions, and that the air filter (s) is clean. When
necessary, refer to Section VI, part C, of this publication to
check the system airflow.
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