Daikin VRV RXYMQ-A Series Service Manual page 151

SiME332106E
Symptom
6 COOL/HEAT The remote controller displays
selection is the mark for centralized
disabled. control.
The remote controller displays
the mark for centralized
control and the COOL/HEAT
selection remote controller is
provided.
7 The system This symptom occurs
conducts fan immediately after turning ON
operation but not the power supply.
cooling or
The remote controller displays
heating
the mark for centralized
operation.
control; no cooling or heating
operation is performed. Switch
to fan operation.
8 The airflow rate Even pressing the airflow rate
is not reproduced setting button makes no
according to the changes to the airflow rate.
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 stopping, the
ambient temperature and
humidity are low.
Indoor and outdoor units
After the completion of defrost
control, 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 defrost control.
Indoor and outdoor units
Hissing sounds are produced
immediately after the startup
or stop of the system, or the
startup or stop of defrost
control.
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.
Part 6 Service Diagnosis
Supposed Cause
This remote controller has no option
to select cooling operation.
COOL/HEAT selection is made
using the COOL/HEAT selection
remote controller.
The system is in preparation mode
of operation.
In thermal storage operation, the
unit is set to fan operation in cooling
or heating operation, and the
remote controller shows the mark
for centralized control.
In heating operation, when the room
temperature reaches the set
degree, the outdoor unit will stop
while the indoor unit is brought to
fan LL operation so that no one gets
cold air.
Furthermore, if fan operation mode
is selected when other indoor unit is
in heating operation, the system will
be brought to fan LL operation.
Automatic control
Uneven temperature distribution
due to heavy stain of the inside of
the indoor unit
Hot gas (refrigerant) that has flowed
in the indoor unit results to be vapor
from the unit.
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 VRV systems, these sounds are
produced when 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
Use a remote controller with option
to select cooling operation.
Use the COOL/HEAT selection
remote controller to select cool or
heat.
Wait for a period of approximately
10 minutes.
Normal operation.
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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