Daikin RXYQ5-48MAY1 Service Manual page 178

Si39-407
Symptom
7 The system This symptom occurs
conducts air immediately after turning ON
blasting the power supply.
operation but not
cooling or
heating
operation.
8 The airflow rate Even pressing the AIRFLOW
is not RATE SET button makes no
reproduced changes in the airflow rate.
according to the
setting.
9 The airflow The airflow direction is not
direction is not corresponding to that
reproduced displayed on the remote
according to the controller.
setting. The flap does not swing.
10 A white mist <Indoor unit>
comes out from In cooling operation, the
the system. ambient humidity is high.
(This indoor unit is installed in
a place with much oil or dust.)
<Indoor unit>
Immediately after cooling
operation, the ambient
temperature and humidity are
low.
<Indoor and outdoor units>
After the completion of
defrosting operation, the
system is switched to heating
operation.
11 The system <Indoor unit>
produces Immediately after turning ON
sounds. the power supply, indoor unit
produces "ringing" sounds.
<Indoor and outdoor units>
"Hissing" sounds are
continuously produced while in
cooling or defrosting operation.
<Indoor and outdoor units>
"Hissing" sounds are produced
immediately after the startup or
stop of the system, or the
startup or stop of defrosting
operation.
<Indoor unit>
Faint sounds are continuously
produced while in cooling
operation or after stopping the
operation.
<Indoor unit>
"Creaking" sounds are
produced while in heating
operation or after stopping the
operation.
<Indoor unit>
Sounds like "trickling" or the
like are produced from indoor
units in the stopped state.
<Outdoor unit>
Pitch of operating sounds
changes.
Troubleshooting
Supposed Cause
The system is in preparation
mode of operation.
In heating operation, when the
room temperature reaches the set
degree, the outdoor unit will stop
while the indoor unit is brought to
breezing operation so that no one
gets cold air.
Furthermore, if blasting mode is
selected when other indoor unit is
in heating operation, the system
will be brought to breezing
operation.
(The breezing operation is also
enabled while in oil return mode in
cooling operation.)
Automatic control
Uneven temperature distribution
due to heavy stain of the inside of
the indoor unit
Hot gas (refrigerant) flown in the
indoor unit results in humidity.
Defrosted moisture turns to be
vapor and comes out from the
units.
These are operating sounds of
the electronic expansion valve of
the indoor unit.
These sounds are produced from
gas (refrigerant) flowing
respectively through the indoor
and outdoor units.
These sounds are produced
when the gas (refrigerant) stops
or changes flowing.
These sounds are produced from
the drain discharge device in
operation.
These sounds are produced from
resin parts expanding and
contracting with temperature
changes.
On multi-unit systems, these
sounds are produced from other
indoor units in operation. The
reason is that the system runs in
order to prevent oil or refrigerant
from dwelling.
The reason is that the compressor
changes the operating frequency.
Symptom-based Troubleshooting
Countermeasure
Wait for a period of approximately
10 minutes.
Normal operation.
Normal operation.
Clean the inside of the indoor unit.
Normal operation.
Normal operation.
Normal operation.
This sound becomes low after a
lapse of approximately one
minute.
Normal operation.
Normal operation.
Normal operation.
Normal operation.
Normal operation.
Normal operation.
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