1
1-263
Resistance within the unit (Pa)
Noise with only external
air intake dB(A)
External Air Intake Volume (m
3
/h)
External Air Intake Volume & Resistance Within Unit/
Operation Noise Characteristics
With the External Air Intake Chamber Attached
External Air Intake Volume & Resistance Within Unit / Operation Noise Characteristics
1-9-2.
4-Way Cassette (Type
U1
)
Use the following diagram along with the section "1-9-1. Precautions Regarding External Air Intake"
1-9-2-1. In a Case of External Air Intake Using Air Intake Chamber (CZ-FCU2+CZ-ATU2)
1.
Sample selection of booster fans
In a case of necessity at 200m
3
/h of external air intake:
Therefore, a booster is required to save a total 95 Pa of static pressure.
1. Resistance within the unit
Diagram from "Resistance within the unit"
55 Pa
2. Duct resistance in case of duct with 4m length
Duct resistance
Diagram from "Air Flow Volume for
Flexible Cylindrical Duct-Pressure Loss"
(=10 Pa/m x 4m)
40 Pa
Total 95 Pa
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 diagram for operation noise characteristics and the operation noise of the unit as stipulated in the catalogue.
2.
The amount of external air that is possible to feed when external air intake chamber is in use
(CZ-FCU2+CZ-ATU2)
* 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.
Permissible air intake
volume (m
3
/h)
The operation noise conforms to JIS standards and constitute measurements taken in an anechoic chamber 1.5m directly
below the indoor unit. Under normal circumstances, the diagram shown above is greater owing to the effects of surrounding
noise and reverberation when the unit is actually installed.
CAUTION
100
90
80
70
60
50
40
30
20
10
0
-10
50
0
50
40
30
20
100
150
200
240
Resistance within the unit
(High speed wind)
Operation noise
(External air intake only)
Filter chamber
(CZ-FCU2)
Kit for external air intake (for chamber)
(CZ-ATU2)
Connection duct: diameter ø100
Type
180
180
180
190
240
36
45
50
60
71
240
240
240
100
125
140
SM830231-02̲Single̲欧州.indb 263
SM830231-02̲Single̲欧州.indb 263
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2014/09/19 13:21:42
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