Equipment Produces Loud Noise Or Vibration - Daikin RZQ Series FCQ20EVA Service Manual

Symptom-based Troubleshooting
2.9

Equipment Produces Loud Noise or Vibration

Applicable All models of TopAir series
Models
 Improper installation
Supposed
 Contacts of fan, piping, casing, etc.
Causes
 Noise of refrigerant flow
 Operating noise of drain discharge equipment
 Noise of resin components contracting
Troubleshooting
Caution Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged.
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
83
 In addition, the following errors may be conceivable
• Overcharge of refrigerant
• Air interfusion
• Flash noise of insufficient refrigerant (hushing noise)
[Installation work side]
YES
YES
slight noise of "shoo..."
NO
"shoo..." generates
just after operation start or stop,
or defrosting start or
YES
"shoo..." generates during
cooling or after operation
YES
heating and after operation
YES
noise at the start/end of
• Overcharge of refrigerant
• Air mixed in refrigerant system
• Flushing noise due to refrigerant
shortage.
(Sound of shoo...)
Continuous
YES
during cooling or
defrosting
NO
Sound of
YES
stop.
NO
Sound of
YES
stop.
NO
Creak during
YES
stop
NO
Is this an impact
YES
defrosting?
NO
SiME281501E
Correction of installation.
Reinforcement for ceilings or
walls
Insert shock absorber in
mounting section, or strengthen
the mounting section.
Normal. The sound is flushing
noise of gas (refrigerant) inside
air conditioning unit.
Insert cushion materials to the
pipe support such as saddle.
Normal. The noise is a sound
generated at the time of gas
(refrigerant) flow change or stop.
Disassemble and remove parts
contact.
Normal. Operation sound of
draining device
Correct piping manually or
attach a dead weight to pipe.
Normal. Creak generates by
shrinkage of resin parts due to
temperature change.
Normal.
Normal.
An impact noise can be
reduced by means of
"Defrost Noise Reduction
Setting." For more
details, refer to "Field
Setting from Remote
Controller".
After vacuum drying, charge
correct amount of refrigerant.
Service Diagnosis