11
SOUND POWER and SOUND PRESSURE LEVELS
(speed 1 = lowest, 4 = highest: Range 1 = speeds 1,2,3: Range 2 = speeds 2, 3, 4)
SOUND POWER LEVELS
SOUND PRESSURE LEVELS
Frequency Hz
MODEL SPEED 125 250 500 1K 2K 4K dBA dBA NC
80
1 56.4 56.2 53.9 54.9 45.1 34.6 57 39 35
2 59.1 58.7 56.0 57.0 49.5 39.2 60 42 38
3 63.4 62.4 59.3 59.5 54.2 45.6 63 45 40
4 66.1 65.5 62.9 62.5 57.8 50.8 66 48 43
110
1 60.6 58.2 55.7 56.2 46.1 35.8 59 41 35
2 63.1 60.5 57.8 58.4 50.6 40.3 61 43 38
3 66.3 63.7 60.8 60.8 55.2 46.4 64 46 40
4 68.8 67.1 64.5 63.9 59.1 52.6 68 50 43
140
1 64.7 60.2 57.5 57.4 47.1 36.9 60 42 38
2 67.1 62.3 59.5 59.7 51.7 41.4 63 45 40
3 69.2 64.9 62.2 62.0 56.2 47.1 65 47 43
4 71.5 68.6 66.1 65.2 60.3 54.4 69 51 46
Sound Power Levels were obtained in conformance with ISO 3745. Values are shown in dB with a standard reference of 1 pW.
Sound Pressure Levels are dB relative to 2 x 10
-5
N/m
2
and are calculated from results measured in anechoic conditions. Values relate to
a position of 3m away from the centre line of the unit, 1m down.
550/551 SERIES MCU+ MHPUL MHPUE
MAXIMUM SPEED
SOUND POWER LEVELS
SOUND PRESSURE LEVELS
Frequency Hz
MCU+ MHPUL(E) 125 250 500 1K 2K 4K dBA dBA NC
60 - 72.9 67.7 67.8 66.4 61.9 54.1 70 50 45
80 - 70.9 68.6 68.1 65.3 59.5 53.8 70 49 43
-80 75.4 72.9 69.1 68.8 62.6 56.6 72 52 47
90 - 81.8 71.8 69.2 68.6 63.1 57.4 73 52 47
100 - 79.4 73.7 71.5 68.5 63.8 58.1 73 53 47
- 100 79.0 69.7 68.6 65.9 61.2 55.2 71 51 44
130 - 73.0 70.3 70.0 68.8 65.0 56.7 73 52 47
150 150 73.1 70.3 70.1 68.9 65.5 57.5 73 57 51
MINIMUM SPEED
SOUND POWER LEVELS
SOUND PRESSURE LEVELS
Frequency Hz
MCU+ MHPUL(E) 125 250 500 1K 2K 4K dBA dBA NC
60 - 67.4 64.3 67.1 66.8 60.7 51.7 70 49 45
80 - 69.4 66.5 66.9 62.1 56.1 51.6 68 47 41
-80 67.5 63.4 64.4 64.2 57.4 51.0 67 47 43
90 - 79.0 65.4 64.9 61.5 58.5 53.7 68 47 40
100 - 75.3 69.4 70.9 63.7 59.7 53.6 70 50 46
- 100 67.1 67.9 65.0 61.2 56.3 51.0 67 46 40
130 - 65.4 66.7 68.1 66.1 63.1 53.0 70 50 44
150 150 65.5 66.9 67.3 65.1 64.2 54.0 73 53 47
Sound Power Levels obtained in conformance with ISO 3741: 1988. Values are in dB with a standard reference of 1 pW.
Sound Pressure Levels are dB relative to 2 x 10
-5
N/m
2
and are calculated from results measured in anechoic conditions Values relate to
a position 3m away from the centre of the unit (in cooling mode); (add 3dBA or 3NC for units at an intersection of a wall, add 1dBA or
1NC for high level wall mounted units).
SOUND PRESSURE LEVELS - DUCTED CONDENSING UNITS
Measurement Point Unit Fan Speed dBA NC
3m from unit in void
DCUE 60, 80
Max 54 48
Min 44 31
Office area DCUE 60, 80
Max 42 28
Min 32 17
3m from discharge grille DCUE 60, 80
Max 52 44
Min 40 28
All readings taken from a typical application of a unit suspended in a ceiling void complete with 5m of insulated ducting, conditioning an
office directly below. Sound Pressure Levels are dB relative to 2x10
-5
N/m
2
.
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