4-103
VRF SYSTEMS Indoor Unit Specifi cations
7. Fresh Air Intake
Calculate the operation noise when external air is being fed by combining the noise when only
external air is being fed as shown in the graph for operation noise characteristics and the operation
noise of the unit as stipulated in the catalogue.
The operation noise conforms to JIS standards and constitute measurements taken in an anechoic
chamber 1.5m directly beneath the indoor unit. Under normal circumstances, the values shown here
are greater owing to the effects of surrounding noise and reverberation when the unit is actually installed.
7-2-5. When an External Air Intake Flange (ø80) is in Use
The operation noise for models that use small units is lower, so use values that are within the range shown
in the above table.
Using values that exceed these will result in noise when only external air is fed being louder than the noise
emitted from the unit.
Type
Permissible Air Intake
Volume (m
3
/h)
36
10
28
10
22
10
15
10
45
10
56
10
The amount of external air that is possible to feed when it is fed directly into the unit (ø80)
NOTE
External Air Intake Volume & Resistance Within Unit / Operation Noise Characteristics (continued)7-2.
4-Way Cassette 60×60 (Y2 Type)
TD831172-00VRFSYSINDOOR.indb103TD831172-00VRFSYSINDOOR.indb103 2014/04/2416:49:312014/04/2416:49:31
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