Excessive Noise/Vibration (2/3) - Mitsubishi Heavy Industries FDT Series Technical Manual

Error code
None
Remote controller:
1. Applicable model
All models
2. Error detection method
3. Condition of Error displayed
4. Presumable cause
Improper installation work
• Improper anti-vibration
work at instllation
• Insufficient strength of
mounting face
Defective product
• Before/after shipping from
factory
Improper adjustment during
commissioning
• Excess/shortage of
refrigerant, etc.
Note:
LED Green Red
– –
Indoor
– –
Outdoor
5. Troubleshooting
Diagnosis
Does
noise/vibration
occur during or soon
after stopping operation
of air-conditioner?
YES
YES
[Installation work]
Does noise/vibration
occur not only from the
air-conditioner
but also from entire
building?
NO
[Product]
Does noise/vibration
occur from operating
fan (fan only)?
NO
To next page
- 368
Content
Excessive noise/vibration (1/3)
NO
Does the
installation of
indoor/outdoor
unit loose?
NO
Are pipes
touching the wall, etc?
NO
Is there a fan
YES
or louver touching other
components?
NO
-
'12 • PAC-T-173
Countermeasure
If excessive noise/vibration
time has elapsed after
stopping the unit, it is
considered that the air-
conditioner is not the
source.
Check the installed
condition carefully, and
correct the position or
insert rubber cushions
YES
or others into the gap, if
necessary.
Prevent the vibration from
transmitting to wall and etc
or wrapping rubber cushion
around the pipe which
YES
goes through the hole in
the wall or applying other
appropriate means.
Strength of ceiling
installing position or
reinforce it.
Check for leaning of
installed unit or anomalous
YES
mounting of fan, louver
or motor and specify the
contacting point and correct
it.
When the heat exchanger
them. In case that the
unit is installed at the site
where background noise
is very low, small noise
from indoor unit can be
heard, but it is normal.
Before installation, check
for background noise. If
backgound nois is very
low, convince client prior
to installation.