Equipment Produces Loud Noise Or Vibration - Daikin ZQG71~140L7V1B Service Manual

Symptom-based Troubleshooting
2.9

Equipment Produces Loud Noise or Vibration

Applicable Model All models of SkyAir series
Supposed
 Defective installation
Causes  Overcharge of refrigerant
 Air mixed in refrigerant system
 Flushing noise due to refrigerant shortage. (Sound of shoo...)
Troubleshooting
Caution Be sure to turn off power switch before connect or disconnect connector, 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?
[Power supply side] 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
124
[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.
NO
YES
Sound of
"shoo..." generates during
cooling or after operation
stop.
NO
YES
Creak during
heating and after operation
stop
NO
YES
Is this an
impact noise at the start/end
of defrosting?
NO
* Overcharge of refrigerant
* Air mixed in 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
It is normal.
After vacuum drying, charge
correct amount of refrigerant.
Service Diagnosis
ESIE12-06