Trane GECA - Page 45

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WSHP-PRC004-EN
Performance
Data Sound
Mock-up Tests of the WSHP
Because the transfer function (the
difference between sound pressure and
sound power) of a water-source comfort
system is often a complex function of
environment and operating mode, we
have found it advantageous to
supplement sound power certification
tests with sound pressure
measurements taken in a mock-up of a
typical environment. The model GECA
mock-up tests were conducted with the
following characteristics.
See Figure
PD-3 for room characteristics during
sound testing.
•
Sheet rock walls
•
Standard office-type carpeting
•
Standard office-type 2-ft x 2-ft
[.6 x .6 m] acoustical tile drop ceiling
•
30-ft x 20-ft [9.14 x 6.1 m] room
•
No windows
•
Unit against the short wall (in the
middle)
For convenience, NC data for all GECA
units are provided in Table PD-20.
Model GECA NC levels are tabulated in
performance Table PD-20. Test results
are given for each of the four cabinet
sizes. Measurements were taken for the
largest tonnage of each cabinet size.
Mock-up test data provides an excellent
general look at how the units would
perform in a typical environment. If the
proposed installation varies significantly
from the mock-up facility and room
acoustics are a concern an acoustical
prediction is justified. As mentioned
before, a predictive analysis requires
octave band sound power data.
Because of the large volume of ARI-350
sound power data, we refer you to the
TOPSS program for octave band and
overall levels for various components.
Figure PD-3 – Room Characteristics During Sound Testing
Table PD-20 – GECA Rating Summary of NC Sound Pressure Levels
(Sound Attenuation Package)
Sound Pressure - NC
Unit Size High Speed Low Speed
006 Compressor Fan Compressor Fan
43 41 40 37
009 Compressor Fan Compressor Fan
44 42 41 38
012 Compressor Fan Compressor Fan
46 46 42 40
015 Compressor Fan Compressor Fan
47 46 44 42