Service; Troubleshooting - Bryant 619ENF Installation, Start-Up And Service Instructions Manual

SERVICE

WARNING: Before
maintenance, be sure unit main power switch is turned
off. Failure to do so may result in electrical shock or
injury form rotating fan blade.
I. PUMPDOWN PROCEDURE
The system may be pumped down in order to make repairs
on the low side without losing complete refrigerant charge.
1. Attach pressure gage to suction service valve gage
port.
2. Frontseat the mixed phase line valve.
CAUTION: The unit coils hold only the factory-des-
ignated amount of refrigerant. Additional refrigerant
may cause units to relieve pressure through the com-
pressor internal pressure relief valve (indicated by a
sudden rise of suction pressure) before suction pres-
sure reaches 20 psig. If this occurs, shut off unit imme-
diately then frontseat the suction valve and remove
and recover excess refrigerant following accepted prac-
tices. Equipment damage may result.
3. Start unit and run until suction pressure reaches
5 psig.
4. Shut unit off and frontseat suction valve.
5. Depressurize low side of unit and recover refrigerant
following accepted practices.
II. FILTER DRIER
Whenever the filter drier is exposed to the atmosphere it
must be replaced. Only use factory specified liquid-line filter
driers with rated working pressure of at least 600 psig or
more.
performing recommended
NOTE: Do not install a suction-line filter drier in the mixed
phase line.
III. REFRIGERANT CHARGING
WARNING: To prevent personal injury, wear
safety glasses and gloves when handling refrigerant.
Do not overcharge system — this can cause compressor
flooding.
NOTE: Do not vent or depressurize unit refrigerant to atmo-
sphere. Remove and recover refrigerant following accepted
practices.

TROUBLESHOOTING

See Tables 6 and 7 for troubleshooting information.
I. FAULT CODE
Once a failure occurs with the indoor unit in operation, the
green LED on the indoor unit flashes at intervals of 0.5 sec-
onds. The fault code is deduced from the number of times the
green LED flashes, blocking unit operation. Between one
flash cycle and the next one, a pause of 3 seconds elapses.
Table 6 — Green LED (Indoor Unit Fault)
CODE
3 Room Air Sensor Fault
4 Indoor Unit Coil Sensor Fault
14 Outdoor Unit Air Sensor Fault
—14—
DESCRIPTION