HUSHCOREÔ Unitary™”TM” System
For Air-Cooled Chillers
PART 1 – GENERAL
1.1 WORK INCLUDED
A. The work consists of furnishing a HUSHCORE™ UNITARY™ “TM” Chiller Noise Reduction System as described in this specification.
1.2 SUBMITTALS
A. Product Data:
1. Manufacturer’s original catalog cut sheets and material description for each sub-component incorporated into the system.
2. “Or Equal” approval of the Acoustical Package will be given upon submission and review 10 days prior to bid day.
1.3 QUALITY ASSURANCE
A. Single Source Requirements:
1. Provide a HUSHCORE™ UNITARY™ “TM” Chiller Noise Reduction System from a single manufacturer.
2. The chiller equipment manufacturer shall furnish the HUSHCORE™ System.
3. The HUSHCORE™ Noise Reduction System shall be installed by the specified product manufacturer.
B. Manufacturer Qualifications:
1. Company specializing in the manufacture of acoustical systems and related accessories with not less than 35 years documented successful experience with work comparable to work of this project.
2. Design Requirements:
a) Design system to meet chiller manufacturers published data pertaining to heat loss of compressors, condenser fan airflow, and ensure no “de-rating” of chiller performance.
b) Design system to meet all environmental conditions such as temperature, wind, shrinkage, UV-rays, and moisture.
PART 2 – PRODUCT
2.1 MANUFACTURER
A. BRD Noise and Vibration Control, Inc., PO Box 127, 112 Fairview Avenue, Wind Gap, PA, 18091, Phone: (610) 863-6300, Fax: (610) 863-4230, E-mail: , Website: www.HUSHCORE.net.
2.2 MATERIALS
A. HUSHCORE™ UNITARY™ “TM” Chiller Noise Reduction System:
1) HUSH GUARD™ Modular Metal Panels, Part Number HGU-700, Metal Acoustical Panels shall be pre-fabricated, sectional, all metal-clad, modular and designed for easy and accurate assembly and disassembly. The acoustical panels and components are designed to surround the condenser fans on air cooled chillers. The panels can be mounted directly onto the chiller top (equipment manufacturer approval required), with sheet metal floor channels for positioning 3 x 3 structural vertical angle braces along both sides of the chiller. The acoustical discharge plenum height shall be as required to meet acoustical performance in 2.3. Top Mounted UNITARY™ Systems cannot be wind load rated unless chiller manufacturer’s unit steel can be detailed.
2) HUSH GUARDÔ HGU-700 Metal Acoustical Panels shall be constructed with galvanized steel sheet metal and core insulation suitable for exposure to the elements. The panels shall be rated at STC-35 minimum. All structural angles shall be painted or galvanized. The panels and components shall not be susceptible to damage due to extended exposure to vibration, air temperature, UV rays or humidity with passage of time.
HUSHCORE™ Unitary™ “TM” System
For Air-Cooled Chillers – (2-1-16)
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2.3 ACOUSTICAL PERFORMANCE
A. The Unitary™ “TM” System HUSH GUARD™ panels shall meet or exceed the Transmission Loss values at every octave band when tested in accordance with ASTM E-90-10 as listed below.
Freq. (Hz) / 80 / 100 / 125 / 160 / 200 / 250 / 315 / 400 / 500 / 630TL (dB) / 22 / 24 / 23 / 22 / 23 / 25 / 26 / 29 / 31 / 33
Freq. (Hz) / 800 / 1000 / 1250 / 1600 / 2000 / 2500 / 3150 / 4000 / 5000 / STC
TL (dB) / 35 / 37 / 40 / 41 / 43 / 45 / 47 / 47 / 48 / 35
B. When operating at worst case noise conditions, the chiller with prescribed noise treatments shall not exceed [ ] at a distance of [ ], assuming no contribution from ambient background sources.
C. Chiller sound power levels with the HUSHCORE™ Unitary™ “TM” System shall not exceed the following levels in any octave band.
63 / 125 / 250 / 500 / 1000 / 2000 / 4000 / 8000 / dBA[ ] / [ ] / [ ] / [ ] / [ ] / [ ] / [ ] / [ ] / [ ]
D. Acoustical reading shall be supplied by the chiller manufacturer after completed installation. Readings shall be conducted by a qualified acoustical consultant.
HUSHCORE™ Unitary™ “TM” System
For Air-Cooled Chillers – (2-1-16)
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