Equipment Produces Loud Noise Or Shakes - Daikin FCQ35B7V1 Service Manual

ESIE05-04
1.3.8

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]
Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be
occurred.
Part 3 – Troubleshooting
Excess charge of refrigerant
Air intrudes into refrigerant system
Flushing noise due to refrigerant shortage. (Sound of shoo...)
[Installation work side]
Does
the noise generate
YES
with vibration of whole
ceilings and
walls?
NO
Does
the noise generate
YES
with vibration of unit
mounting section?
NO
NO
Is the piping secured?
YES
Does the
YES
fan contact with other
parts?
NO
Does the
YES
pipe contact with
casing?
NO
Is
the noise
YES
flushing sound from
pressure reducing valve
or capillary
tube?
NO
Continuous
YES
slight noise of "shoo..."
during cooling or
defrosting
NO
Sound of
"shoo..." generates
YES
just after operation start or
stop, or defrosting
start or stop.
NO
Sound of
YES
"shoo..." generates
during cooling or after
operation
stop.
NO
Creak during
YES
heatingand after operation
stop
NO
∗ Excess charge of refrigerant
∗ Air intrudes into refrigerant
YES
system
∗ Flushing noise due to
refrigerant shortage. (Sound
of shoo...)
Troubleshooting
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.
After vacuum drying, charge
correct amount of refrigerant.
(S1997)
3–15
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