5-3
FIELD WORK INSTRUCTION
5.3 Abnormally High Operating Sound [In-the-Ceiling Type Indoor Unit]
Question and Answer for Field Work
Example 3: Abnormally High Operating Sound
[In-the-Ceiling Type Indoor Unit]
[Phenomenon]
Operating sound during “Hi” speed was abnormally high.
[Cause]
The indoor units was installed without ducts of inlet side and outlet side. Due to almost no external
static pressure, abnormally big air volume was supplied, resulting in higher air speed through the
heat exchanger.
[Countermeasure]
In order to reduce air flow, a plate as a damper at the discharge side was added.
Another solution is at inlet side and outlet side.
[Remarks]
Please note that running current is increased when no external pressure is given to the indoor unit,
resulting in overheating.
Air Filter
Damper
Indoor Unit
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