Symptom-based Troubleshooting
16
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 1
minute.
<Indoor and
outdoor units>
"Hissing" sounds are
continuously
produced while in
cooling or defrosting
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
defrosting 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.
Symptom
Supposed Cause Countermeasure
Содержание VRVII
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