4-310
2WAY SYSTEM Unit Specifi cations
1
2
3
4
5
6
7
8
9
18. Intaking Fresh Air of 4-Way Cassette Type and Slim Low Static Ducted Type
0
0
10
20
30
20
30
40
50
40
50
60
70
80
90
100
5
10
15
20
18
Resistance within the Unit (Pa)
Noise with only External
Air Intake dB(A)
External Air Intake Volume (m
3
/h)
External Air Intake Volume and Resistance and
Operation Noise Characteristics within the Unit
Operation Noise
(External Air Intake Only)
With the External Air Intake Flange Attached
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.
0
0
10
20
30
40
50
60
120
180
Resistance within the Unit (Pa)
Permissible Air Intake Volume (m
3
/min)
Resistance within the Unit OFF
U1, Y1 Types
When an External Air Intake Flange (
ø
100) is in Use
For use with mini cassettes
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
36
13
28
13
22
13
45
15
56
15
(m
3
/h)
Type
Permissible Air Intake
Volume
36
108
28
102
22
96
15
96
45
126
56
150
(m
3
/h)
The amount of external air that is possible to feed when it is fed directly into the unit (
ø
100)
U1, Y1 Types
The amount of external air that is possible to feed when
connected to round ducts (
ø
100).
M1 Type
Using values that exceed those shown in the above table will
result in noise when only external air is fed being louder than
the noise emitted from the indoor unit, so only use values that
are within the range of the above values.
External Air Intake Volume and
Resistance within the Unit
Duct (ø100) for Connecting
the External Air Intake Flange
With the External Air Intake Flange
Attached
NOTE
NOTE
Duct (ø100) for Connecting
the External Air Intake Flange
U1 Type
Y1 Type
TD831159-04̲2WAY VRF.indb 310
TD831159-04̲2WAY VRF.indb 310
2014/09/08 12:02:51
2014/09/08 12:02:51