Product Manual AGR-3 AGR 070A through 100A
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Sound Data
Table 12, AGR 070AS/AM - 100AS/AM Sound Pressure
Sound Pressure At 30 ft. From Sides Of Unit (dB)
Octave Band
Unit
Model
63 125 250 500 1000 2000 4000 8000
Sound Pressure
Overall
A-Weighted
AGR070A
65 65 64 64 62 56 54 54 66
AGR075A
66 67 65 65 62 56 55 55 67
AGR080A
66 68 65 65 62 56 56 55 67
AGR085A
67 69 66 65 62 56 56 55 67
AGR090A
67 69 66 65 62 56 56 55 67
AGR095A
68 69 67 66 63 58 58 56 68
AGR100A
69 70 68 66 63 58 58 56 68
Note: Data at 30 ft. (9m) from side of unit.
Table 13, AGR 070AS/AM – 100AS/AM Sound Power
Sound Power
Octave Band
Unit
Model
63 125 250 500 1000 2000 4000 8000
Sound Power
Overall
A-Weighted
AGR070A
92 92 91 91 89 83 81 81 93
AGR075A
93 94 92 92 89 83 82 82 94
AGR080A
93 95 92 92 89 83 83 82 94
AGR085A
94 96 93 92 89 83 83 82 94
AGR090A
94 96 93 92 89 83 83 82 94
AGR095A
95 96 94 93 90 85 86 83 95
AGR100A
96 97 95 93 90 85 86 83 95
Note: Per ARI Standard 370
Sound levels are as important as unit cost and efficiency, and must be addressed before to the start of
any development program. Efforts by McQuay design engineers to design chillers that are sensitive to
the sound requirements of the market have paid off.
Background Information
Sound is a vibration in an elastic medium and is essentially a pressure and particle displacement
phenomena. A vibrating body produces compression waves and as the waves are emitted from the
vibrating body, molecules are ultimately compressed. These values are transmitted through gas, liquid,
solid
anything which is elastic or viscous.
The sound data provided in this section is presented with both sound pressure and sound power levels.
Sound power is the total sound energy radiated by a source per unit of time integrated over the surface
through which the sound is radiated. Sound power is a calculated quantity and cannot be measured
directly like sound pressure. Sound power is not dependent on the surrounding environment or distance
from the source, as is sound pressure.
Sound pressure varies with the distance from the source and is dependent on its surroundings. For
example, a brick wall located 10 feet from a unit will affect the sound pressure measurements
differently than a brick wall at 20 feet. Sound pressure is measured in decibels (dB), which is a
dimensionless ratio (on a logarithmic scale) between measured sound pressure and a reference sound
pressure level.
Sound Pressure Levels - Full Load
All sound pressure tables give the overall "A" weighted sound pressure levels which are considered
typical of what may be measured in a free field with a hand held sound meter, in the absence of any
nearby reflective surfaces. The sound pressure levels are measured at 30 feet (10 meters) from the side
of the unit at 100% unit load and ARI conditions. 95°F (35°C) ambient air temperature and 54/44°F
(12/7°C) evaporator water temperatures for air-cooled units.
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