12 Maintenace notes
465
SMGB0064 rev.0 - 08/2011
12
12.4 Abnormally high operation sound (in the ceiling type indoor unit).
Question and answer for the eld work
Example 3: Abnormally high operation sound (in-the-ceiling type indoor unit)
Phenomenon The operation sound at the “HIGH” speed was abnormally high.
Cause
The indoor units were installed without the ducts. Since there scarcely was any external static pressure an abnormally big
air volume was supplied. This resulted in a higher air speed through the heat exchanger.
Indoor unit
A. Filter
Countermeasure In order to reduce the airow rate a plate that is used as a damper at the discharge gas side was added.
Remarks
Note that the running current is increased when no external pressure is given to the indoor unit. This results in an over-
heating.
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