machines. As a minimum if a factory sound test is
not deemed necessary, indicated the maximum
allowable sound level requirements for all
applicable chiller components on the drawings.
In the paragraph below, select 85 decibels if
military personnel (90 decibels for civilian
personnel) will operate the equipment without
hearing protection. Other decibel requirements may
be specified if hearing protection is provided.
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Chillers shall be sound tested at the factory prior to shipment to confirm
the sound pressure level specified herein. Tests and data shall be
conducted and measured in strict accordance with ARI 575 at the full load
system operating conditions. The chiller sound pressure level, in decibels
(dB), with a reference pressure of 20 micropascals, shall not exceed [85]
[90] [_____] dB, A weighted. Ratings shall be in accordance with ARI 575.
No reduction of entering condenser water temperature or raising of leaving
chilled water temperature shall be allowed. A minimum of 75 percent of the
sound data points shall be taken along the length of the machine, and
established as the minimum percentage of total possible points used to
determine sound levels. In the event that the chiller does not meet the
dBA sound pressure level, the manufacturer shall, at his expense, provide
sufficient attenuation to the machine to meet the specified value. This
attenuation shall be applied in such a manner that it does not hinder the
operation or routine maintenance procedures of the chiller. The
attenuation material, adhesives, coatings, and other accessories shall have
surface burning characteristics as determined by ASTM E 84.
2.11
SUPPLEMENTAL COMPONENTS/SERVICES
2.11.1
Chilled and Condenser Water Piping and Accessories
Chilled and condenser water piping and accessories shall be provided and
installed in accordance with Section 15181 CHILLED, CHILLED-HOT, AND
CONDENSER WATER PIPING SYSTEMS.
2.11.2
Refrigerant Piping
Refrigerant piping for split-system liquid chillers shall be provided and
installed in accordance with Section 15182 REFRIGERANT PIPING.
2.11.3
Cooling Tower
Cooling towers shall be provided and installed in accordance with Section
15645A COOLING TOWER.
2.11.4
Temperature Controls
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NOTE: Modify this paragraph as required to
coordinate the central equipment controls with the
air-side system controls. In projects where this
section of the specifications is intended to produce
control equipment for existing air-side systems,
this paragraph will be rewritten to secure controls
to match existing controls and to properly integrate
the specified controls into the existing temperature
SECTION 15620A
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