Daikin VRV RXYQ72-384XAYCA, Service Manual

Page: 218 / 419

Symptom-based Troubleshooting SiUS342004EB
211 Part 6 Service Diagnosis
11 The system
produces sounds.
Indoor unit
Immediately after turning ON
the power supply, indoor unit
produces ringing sounds.
These are operating sounds of the
electronic expansion valve of the
indoor unit.
Normal operation.
This sound becomes low after a
lapse of approximately one minute.
Indoor and outdoor units
Hissing sounds are
continuously produced while in
cooling or defrost operation.
These sounds are produced from gas
(refrigerant) flowing respectively
through the indoor and outdoor units.
Normal operation.
Indoor and outdoor units
Hissing sounds are produced
immediately after the startup or
stop of the system, or the
startup or stop of defrost
operation.
These sounds are produced when
the gas (refrigerant) stops or changes
flowing.
Normal operation.
Indoor unit
Faint sounds are continuously
produced while in cooling
operation or after stopping the
operation.
These sounds are produced from the
drain discharge device in operation.
Normal operation.
Indoor unit
Creaking sounds are produced
while in heating operation or
after stopping the operation.
These sounds are produced from
resin parts expanding and
contracting with temperature
changes.
Normal operation.
Indoor unit
Sounds like trickling or the like
are produced from indoor units
in the stopped state.
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.
Normal operation.
Outdoor unit
Pitch of operating sounds
changes.
The reason is that the compressor
changes the operating frequency.
Normal operation.
12 Dust comes out
from the system.
Dust comes out from the
system when it restarts after
the stop for an extended period
of time.
Dust, which has deposited on the
inside of indoor unit, is blown out
from the system.
Normal operation.
13 Odors come out
from the system.
In operation Odors of room, cigarettes or else
adsorbed to the inside of indoor unit
are blown out.
The inside of the indoor unit should
be cleaned.
14 Outdoor fan does
not rotate.
In operation The reason is that fan revolutions are
controlled to put the operation to the
optimum state.
Normal operation.
15 LCD display 88 or
Checking the
connection.
Please stand by.
appears on the
remote controller.
Immediately after turning ON
the power supply
The reason is that the system is
checking to be sure the remote
controller is normal.
Normal operation.
This code is displayed for a period of
approximately one minute at
maximum.
16 The outdoor unit
compressor or
the outdoor fan
does not stop.
After stopping operation It stops in order to prevent oil or
refrigerant from dwelling.
Normal operation.
It stops after a lapse of approximately
5 to 10 minutes.
17 The outdoor gets
hot.
While stopping operation The reason is that the compressor is
warmed up to provide smooth startup
of the system.
Normal operation.
18 Hot air comes out
from the system
even though it
stops.
Hot air is felt while the system
stops.
On VRV systems, small quantity of
refrigerant is fed to indoor units in the
stopped state when other indoor units
are in operation.
Normal operation.
Symptom Supposed Cause Countermeasure