Equipment Produces Loud Noise Or Shakes - Daikin SkyAir Super Inverter 70 D Series Service Manual

SiE25-110
3.9

Equipment Produces Loud Noise or Shakes

Applicable Model
All models of SkyAir series
Error Detection
Method
Error Generating
Condition
Possible Cause
Troubleshooting
[Power supply side]
Troubleshooting
Faulty installation
Excess charge of refrigerant
Air intrudes into refrigerant system
Flushing noise due to refrigerant shortage. (Sound of shoo...)
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
Does
the noise generate
with vibration of whole
ceilings and
walls?
NO
Does
the noise generate
with vibration of unit
mounting section?
NO
Is the piping secured?
YES
Does the
fan contact with other
parts?
NO
Does the
pipe contact with
casing?
NO
Is
the noise
flushing sound from
pressure reducing valve
or capillary
tube?
NO
Troubleshooting Based on Equipment Condition
[Installation work side]
YES
YES
Continuous
slight noise of "shoo..."
during cooling or
defrosting
NO
NO
Sound of
"shoo..." generates
just after operation start or
stop, or defrosting
start or stop.
YES
NO
Sound of
"shoo..." generates
during cooling or after
operation
stop.
YES
NO
Creak during
heatingand after operation
stop
YES
NO
∗ Excess charge of refrigerant
∗ Air intrudes into refrigerant
system
∗ Flushing noise due to
refrigerant shortage. (Sound
of shoo...)
Correction of installation
Reinforcement for ceilings or
walls
Insert shock absorber in
mounting section, or
strengthen the mounting
section.
YES
Normal. The sound is flushing
noise of gas (refrigerant)
inside air conditioning unit
Insert cushion materials to the
pipe support such as saddle.
YES
Normal. The noise is a sound
generated at the time of gas
(refrigerant) flow change or
stop
Disassemble and remove
parts contact.
YES
Normal. Operation sound of
draining device
Correct piping manually or
attach a dead weight to pipe
YES
Normal. Creak generates by
shrinkage of resin parts due to
temperature change.
Normal.
YES
After vacuum drying, charge
correct amount of refrigerant.
(S1997)
117