Sound Application Guide: Description and Ratings

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1 Sound Application Guide: Description and Ratings

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3 AHRI SOUND STANDARD: DESCRIPTION AND RATINGS Table of Contents Overview AHRI 260 Sound Ratings for Ducted Units AHRI 350 Sound Ratings for Non-ducted Units Acoustical Basics Rating Methods Acoustical Installation Considerations Performance Data Series (700A11) Variable Speed ECM Series (500A11) Single Speed (Standard) PSC Series (500A11) Single Speed (Standard) ECM Series (500A11) Dual Capacity (Standard) ECM Series (300A11) Dual Capacity (Standard) ECM Envision 2 Compact & XL Single Speed (Standard and Super Quiet) PSC Envision 2 Compact & XL Single Speed (Standard and Super Quiet) ECM Envision 2 Compact & XL Dual Capacity (Standard and Super Quiet) Envision XL - Belt Drive (Standard and Super Quiet) Synergy3D (Standard) Versatec Ultra Series (Standard and Super Quiet) PSC Versatec Ultra Series (Standard and Super Quiet) ECM Versatec Base Series (Standard and Super Quiet) PSC Versatec Base Series (Standard and Super Quiet) ECM Envision Series Console Envision Series Low Sill Console Envision Series Water-to-Water Units Envision Series NSW Hydronic Envision Series NDW Hydronic Envision Series NHW Envision Series NXW Large Reversible Chiller Revision Guide

4 Overview - AHRI 260 Sound Ratings for Ducted Units AHRI 260 is a recently adopted standard for rating ducted air moving and conditioning equipment. Prior to AHRI 260 there was no standard for the evaluation of water source heat pump (WSHP) sound performance. Previously, wshp manufacturers tested per their own internal procedures making comparisons between manufacturers impossible. Now with AHRI 260 and a standardized test procedure and rating system, sound ratings are usable by acousticians to estimate the resulting sound pressure of wshp equipment in new buildings. Ducted Inlet AHRI allows rating of product in 5 common applications: Ducted Inlet Casing Radiated Free Inlet Free Inlet/Casing Radiated The last two applications, ducted discharge and free inlet casing radiated, are most commonly used as rating points for wshp manufacturers. Ducted discharge is typically the worst case scenario for airflow noise and represents an office location located under the discharge air noise. Free inlet/casing radiated is also often used because it combines a noisy open air return with cabinet radiated noise from the compressor and represents an office location directly below the unit itself in an open plenum return. Casing Radiated Free Inlet Free Inlet/Casing Radiated Overview - AHRI 350 Sound Ratings for Ducted Units AHRI 350 sound standard is used to rate non-ducted indoor air-conditioning equipment. This standard is similar in many ways to AHRI 260 with the free inlet/casing radiated condition. The application for this equipment is typically a unit operated at free-delivery conditions without any ductwork. This is the case for compressor bearing units such as a console that operates directly in the occupied space. Classrooms, hotel rooms, and offices commonly encounter this situation. 4

5 Acoustical Basics Most of this discussion that follows is described in ASHRAE Fundamentals Chapter 7. Noise is best described as an unwanted or unpleasant sound usually emanating from a vibrating surface or a turbulent fluid (air) stream. Obviously this noise can appear at many different pitches or frequencies. Below is a chart summarizing typical frequency spectrum of HVAC noise and its cause. The pitch or frequency of the sound is measured in Hertz (Hz) or cycles per second. The frequency band that the human ear can hear is 20 Hz to 20 khz. This range will vary by person and by age, with younger people hearing typically near the 20 khz frequency and older people s hearing dropping off to around 12 khz. To aid in the description of sound many times this spectrum is divided into octave bands. That is to say an octave is where the second frequency is twice the Hz as the first. In pitch terms, it is exactly as an octave sounding on the piano. The range of HVAC noise is usually limited to the 63 Hz 8 khz range with the ultra low 8 63 Hz range reserved for larger air moving products like VAV. Some applications require further dividing the spectrum into one-third octave bands. This is accomplished by dividing the octave into three equal frequency parts. The accepted measurement unit is the db (decibel) for comparing these sound power or pressure level ratios. By definition the db is equal to 10 times the base 10 logarithm of the ratio of any two like quantities. Usually differences of 10 db are described by the listener as twice as loud, and differences of 3 4 db are barely noticeable to the listener. Figure 2 shows typical sound pressure levels for common noise sources. The most important concept in this primer is illustrated by Figure 3. Sound power will emanate from the sound source. Then the resulting sound pressure level, measured at the occupant of the room, will represent the resulting noise level as it approaches the listener. The sound power is the result of the testing procedure in AHRI 260. Then sound pressure levels for a given room can be predicted using acoustical equations to estimate noise levels for the occupant. This means given the data from AHRI 260, noise performance in a building can be estimated using standard acoustical engineering methods. Now not only can sound levels be compared manufacturer to manufacturer, but also sound performance in the building can be predicted. Figure 1: Typical HVAC Sound Spectra (reference ASHRAE 2005 Fundamentals 7.15, and HVAC Applications 47.2). Figure 3: Sound power emanates from WSHP equipment and sound pressure is experienced by occupants of building. SOUND PRESSURE 5

6 Acoustical Basics cont. Figure 2: Typical Sound Pressure Levels (reference ASHRAE 2005 Fundamentals 7.2 Table 1). μ Rating Methods Single Number Ratings A-Weighting In the past some single number ratings have been used such as dba. The A represents the A-weighted sound level. This weighting refers to adjusting the loudness measurements to effectively correct for the sensitivity of the human ear to different frequencies. However, the limited frequency range of A-Weighting, Hz, is most frequently used in occupational hazard measurement where the human ear is most sensitive. This means annoyance type noises of lower frequency like HVAC rumble are not even measured by dba ratings. C-Weighting The C-Weighted sound pressure level (L A ) is used when a single number is desired to state the design goal. This weighting scale is most often used with the measurement of wide spectrum (i.e. music) in occupational environment and is sensitive to the wide Hz range. The extended lower frequency range is important with the measurement of rumble and its impact on the measurement method is simple. A single measurement is made on a handheld instrument and the C-weighting is typically a selection on the instrument. (dbc). The C-weighting is most often used when measuring non-hazardous noise in occupational and recreational environments such as offices or music concerts where the sound source is a full spectrum. 6

7 Rating Methods cont. Single Number Ratings cont. Noise Criterion Method NC Curves The NC method has been used for more than 40 years. Although it is a single number rating, it is more sensitive to relative loudness and speech interference of a given noise spectrum. It is popular primarily because of its wide use in acoustic design textbooks. A noise curve is corrected for transmission loss through the ceiling ASHRAE 2003 HVAC Applications The resulting noise curve is then plotted on a chart of NC curves (every 5 db). The highest interpolated NC curve (in 1 db increment) attained is the NC rating. Figure 4 shows an example with an NC-36 rating. Figure 4: NC Performance results in an NC-36 Rating Balanced Noise Criteria (NCB) The NCB method was designed as a successor method to the NC Curve. The NCB features higher permissible upper frequencies, two low frequency octave bands, and an additional test for rumble and hiss compliance. By averaging the NCB levels for frequencies 500, 1k, 2k, and 4k, the overall NCB rating is obtained. Figure 5: NCB Performance results in an NCB-25 rating with rumble imbalance. The method also allows for a descriptor for low frequency rumble or high frequency hiss imbalance. If frequencies below 1 khz are more than 3 db higher than the NCB rating curve, it is rumble imbalanced. If frequencies above 1 khz are more than the best fit level of the 125, 250 and 500 Hz NCB rating curve, the NCB rating curve is hiss imbalanced. The figure below results in an NCB 25 with low frequency rumble imbalance. 7

8 Rating Methods cont. Room Criteria (RC) Mark II Method The RC Mark II method was designed specifically for HVAC equipment as a whole. This method features a set of rating curves, a procedure for determining the RC rating, and a procedure for rating occupant satisfaction (quality) when the noise shape does not match the RC curves. The RC is the average of 500 Hz 2 khz levels and the quality index when the curve deviates from the RC curve. The quality index adds on a LF (low frequency), MF (medium frequency), HF (high frequency), or N (neutral). The example below is an RC rating of RC30 (Neutral). Figure 6: RC Mark II Performance results in an RC-30 (N) rating. 8

9 Acoustical Installation Considerations WaterFurnace product today employs several technologies to reduce noise. They may include scroll compressors, variable speed fan motor with oversized blower, dual compressor isolation mounting plate, compressor blankets and multi-density base plates, and finally multi-density fiberglass insulation. The following figure illustrates some of the installation acoustic considerations that should be considered. Recommendations for Noise Reduction Horizontal Unit Location Specify equipment with quietest sound power ratings Do not locate units above areas with a required NC-40 or less Space WSHP at least 10 ft. (3m) apart to avoid noise summing of multiple units in a space. Maximize the height of the unit above the ceiling (horizontal). Suspend unit with isolation grommets that are appropriately rated to reduce vibrations (horizontal). Vertical Unit Location Specify equipment with quietest sound power ratings Space WSHP at least 10 ft. (3m) apart to avoid noise summing of multiple units in a space. Acoustic ceiling coatings can greatly reduce noise levels in mechanical rooms. Mount unit on a sound absorbing pad, extruded polystyrene, rubber or cork pad. Ductwork Ensure return air grilles will not allow line of site noise to transfer to adjacent space. Use a sound barrier or some other material to isolate the grille from the unit. A supply grille, boot and short piece of flex duct pointed away from the unit can greatly attenuate equipment noise. Use a canvas isolation duct connector at the supply and return duct connection of the unit. Internally line the discharge and return duct within the first 4-8 feet of unit with acoustic insulation. Install an internally lined L shaped return duct elbow at return grille. Face the elbow away from adjacent units. Always install at least one 90 elbow in the discharge duct to eliminate line of sight noise transmission of the blower. Use turning vanes at all elbows and tees to reduce turbulence. Limit supply duct velocities to less than 1000 fpm Design and install ductwork as stiff as possible Allow 3 duct diameters both up and down stream of the unit before any fittings or transitions are installed. Use duct sealant on all duct joints. Install a short (2-4 ft.) of flex duct on all branch ducts just prior to discharge boot or diffuser to reduce vibration and duct sound prior to delivery in the room. Locate the branch duct balancing damper as far away from the diffuser as possible. In ceiling plenum systems, install an internally lined L shaped return duct elbow at unit. Face the elbow away from adjacent units (horizontal). Figure 7: Horizontal acoustic consideration 90 deg elbow on supply Sealed low velocity ductwork Turning vanes at elbows and Tees Branch damper upstream Flex duct at diffuser 2-4 ft Locate return grille 6 ft from unit Acoustic lining to elbow Locate units over hallways where possible Flexible water and electrical connections Canvas connector Insulated Return (optional) Supply grille with 2-3 ft of flex left open for return air 9

10 Performance Data - 7 Series ECM Variable Speed Standard Construction Free Air Inlet Combined with Casing (Cabinet) Radiated OCTAVE BAND FREQUENCY, Hz OCTAVE BAND FREQUENCY, Hz MODEL Cabinet MODE Fan Only Cooling: Low Speed V/H Cooling: High Speed Heating: Low Speed Heating: High Speed V/H Fan Only Cooling: Low Speed Cooling: High Speed Heating: Low Speed Heating: High Speed Fan Only Cooling: Low Speed V/H Cooling: High Speed Heating: Low Speed Heating: High Speed /28/14 Data based on sound measurements made in a Reverberant room on representative units from each cabinet size in accordance with ARI standard

11 Performance Data - 5 Series 5 Series Single Speed - Standard Construction - PSC Free Air Inlet Combined with Casing (Cabinet) Radiated Model Cabinet Mode V/H 022 V/H 030 V/H 036 V/H 042 V/H 048 V/H 060 V/H Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Fan Only V/H Cooling: High Speed Heating: High Speed /28/14 Data based on sound measurements made in a Reverberant room on representative units from each cabinet size in accordance with ARI standard

12 Performance Data - 5 Series cont. 5 Series Single Speed - Standard Construction - ECM Free Air Inlet Combined with Casing (Cabinet) Radiated Model Cabinet Mode V/H 022 V/H 030 V/H 036 V/H 042 V/H 048 V/H 060 V/H Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Fan Only V/H Cooling: High Speed Heating: High Speed /28/14 Data based on sound measurements made in a Reverberant room on representative units from each cabinet size in accordance with ARI standard

13 Performance Data - 5 Series cont. 5 Series Dual Capacity - Standard Construction Free Air Inlet Combined with Casing (Cabinet) Radiated OCTAVE BAND FREQUENCY, Hz OCTAVE BAND FREQUENCY, Hz MODEL Cabinet MODE V/H 038 V/H 049 V/H 064 V/H Fan Only Cooling: Low Speed Cooling: High Speed Heating: Low Speed Heating: High Speed Fan Only Cooling: Low Speed Cooling: High Speed Heating: Low Speed Heating: High Speed Fan Only Cooling: Low Speed Cooling: High Speed Heating: Low Speed Heating: High Speed Fan Only Cooling: Low Speed Cooling: High Speed Heating: Low Speed Heating: High Speed Fan Only Cooling: Low Speed V/H Cooling: High Speed Heating: Low Speed Heating: High Speed /28/14 Data based on sound measurements made in a Reverberant room on representative units from each cabinet size in accordance with ARI standard

14 Performance Data - 3 Series 3 Series Dual Capacity - Standard Construction Free Air Inlet Combined with Casing (Cabinet) Radiated OCTAVE BAND FREQUENCY, Hz OCTAVE BAND FREQUENCY, Hz MODEL Cabinet MODE V/H 036 V/H 048 V/H 060 V/H 072 V/H Fan Only Cooling: Low Speed Cooling: High Speed Heating: Low Speed Heating: High Speed Fan Only Cooling: Low Speed Cooling: High Speed Heating: Low Speed Heating: High Speed Fan Only Cooling: Low Speed Cooling: High Speed Heating: Low Speed Heating: High Speed Fan Only Cooling: Low Speed Cooling: High Speed Heating: Low Speed Heating: High Speed Fan Only Cooling: Low Speed Cooling: High Speed Heating: Low Speed Heating: High Speed Data based on sound measurements made in a Reverberant room on representative units from each cabinet size in 4/6/15 accordance with ARI standard

15 Performance Data - Envision 2 Compact & Envision XL Envision2 Compact Series Single Speed - Standard Construction - PSC Free Air Inlet Combined with Casing (Cabinet) Radiated Model Cabinet Mode V/H 012 V/H 015 V/H 018 V/H 024 V/H 030 V/H 036 V/H 042 V/H 048 V/H 060 V/H Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Fan Only V/H Cooling: High Speed Heating: High Speed /28/14 Data based on sound measurements made in a Reverberant room on representative units from each cabinet size in accordance with ARI standard

16 Performance Data - Envision 2 Compact & Envision XL cont. Envision2 Compact Single Speed Series - Super Quiet Construction - PSC Free Air Inlet Combined with Casing (Cabinet) Radiated Model Cabinet Mode V/H 012 V/H 015 V/H 018 V/H 024 V/H 030 V/H 036 V/H 042 V/H 048 V/H 060 V/H Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Fan Only V/H Cooling: High Speed Heating: High Speed /28/14 Data based on sound measurements made in a Reverberant room on representative units from each cabinet size in accordance with ARI standard

17 Performance Data - Envision 2 Compact & Envision XL cont. Envision2 Compact Series Single Speed - Standard Construction - ECM Free Air Inlet Combined with Casing (Cabinet) Radiated Model Cabinet Mode Fan Only V/H Cooling: High Speed Heating: High Speed Fan Only V/H Cooling: High Speed Heating: High Speed Fan Only V/H Cooling: High Speed Heating: High Speed Fan Only V/H Cooling: High Speed Heating: High Speed Fan Only V/H Cooling: High Speed Heating: High Speed Fan Only V/H Cooling: High Speed Heating: High Speed Fan Only V/H Cooling: High Speed Heating: High Speed Fan Only V/H Cooling: High Speed Heating: High Speed Fan Only V/H Cooling: High Speed Heating: High Speed Data based on sound measurements made in a Reverberant room on representative units from each cabinet size in accordance with 7/28/14 ARI standard Envision2 Compact Single Speed Series - Super Quiet Construction - ECM Free Air Inlet Combined with Casing (Cabinet) Radiated Model Cabinet Mode Fan Only V/H Cooling: High Speed Heating: High Speed Fan Only V/H Cooling: High Speed Heating: High Speed Fan Only V/H Cooling: High Speed Heating: High Speed Fan Only V/H Cooling: High Speed Heating: High Speed Fan Only V/H Cooling: High Speed Heating: High Speed Fan Only V/H Cooling: High Speed Heating: High Speed Fan Only V/H Cooling: High Speed Heating: High Speed Fan Only V/H Cooling: High Speed Heating: High Speed Fan Only V/H Cooling: High Speed Heating: High Speed Data based on sound measurements made in a Reverberant room on representative units from each cabinet size in accordance with 7/28/14 ARI standard

18 Performance Data - Envision 2 Compact & Envision XL cont. Envision2 Compact Series Dual Capacity - Standard Construction Free Air Inlet Combined with Casing (Cabinet) Radiated OCTAVE BAND FREQUENCY, Hz OCTAVE BAND FREQUENCY, Hz MODEL Cabinet MODE Fan Only Cooling: Low Speed V/H Cooling: High Speed Heating: Low Speed Heating: High Speed Fan Only Cooling: Low Speed V/H Cooling: High Speed Heating: Low Speed Heating: High Speed Fan Only Cooling: Low Speed V/H Cooling: High Speed Heating: Low Speed Heating: High Speed Fan Only Cooling: Low Speed V/H Cooling: High Speed Heating: Low Speed Heating: High Speed Fan Only Cooling: Low Speed V/H Cooling: High Speed Heating: Low Speed Heating: High Speed Data based on sound measurements made in a Reverberant room on representative units from each cabinet size in accordance with 7/28/14 ARI standard Envision2 Compact Series Dual Capacity - Super Quiet Construction Free Air Inlet Combined with Casing (Cabinet) Radiated OCTAVE BAND FREQUENCY, Hz OCTAVE BAND FREQUENCY, Hz MODEL Cabinet MODE Fan Only Cooling: Low Speed V/H Cooling: High Speed Heating: Low Speed Heating: High Speed Fan Only Cooling: Low Speed V/H Cooling: High Speed Heating: Low Speed Heating: High Speed Fan Only Cooling: Low Speed V/H Cooling: High Speed Heating: Low Speed Heating: High Speed Fan Only Cooling: Low Speed V/H Cooling: High Speed Heating: Low Speed Heating: High Speed Fan Only Cooling: Low Speed V/H Cooling: High Speed Heating: Low Speed Heating: High Speed Data based on sound measurements made in a Reverberant room on representative units from each cabinet size in accordance with 7/28/14 ARI standard

19 Performance Data - Envision 2 Compact & Envision XL cont. Envision Series - 7 to 25 Ton - Standard Construction - Belt Drive Free Air Inlet Combined with Casing (Cabinet) Radiated Model Cabinet Mode Fan Only H* Cooling: High Speed Heating: High Speed H* 120 H* 080 V* 095 V* 120 V* 160 V* 180 V* 240 V* Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Fan Only V* Cooling: High Speed Heating: High Speed Data based on sound measurements made in a Reverberant room on representative units from each cabinet size in 7/28/14 accordance with ARI standard * Units employ 1-3 hp beld drive, induction motors. Test was ran with standard static and standard motor option. 19

20 Performance Data - Envision 2 Compact & Envision XL cont. Envision Series - 7 to 25 Ton - Super Quiet Construction - Belt Drive Free Air Inlet Combined with Casing (Cabinet) Radiated Model Cabinet Mode Fan Only H* Cooling: High Speed Heating: High Speed H* 120 H* 080 V* 095 V* 120 V* 160 V* 180 V* 240 V* Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Fan Only V* Cooling: High Speed Heating: High Speed Data based on sound measurements made in a Reverberant room on representative units from each cabinet size in 7/28/14 accordance with ARI standard * Units employ 1-3 hp beld drive, induction motors. Test was ran with standard static and standard motor option. 20

21 Performance Data - Synergy3D Synergy3D Series - Dual Capacity - Standard Construction Free Air Inlet Combined with Casing (Cabinet) Radiated Model Cabinet Mode V 049 V 064 V Fan Only Hydronic Mode NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA Cooling: Low Speed Cooling: High Speed Heating: Low Speed Heating: High Speed Fan Only Hydronic Mode NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA Cooling: Low Speed Cooling: High Speed Heating: Low Speed Heating: High Speed Fan Only Hydronic Mode NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA Cooling: Low Speed Cooling: High Speed Heating: Low Speed Heating: High Speed Fan Only Hydronic Mode NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 072 V Cooling: Low Speed Cooling: High Speed Heating: Low Speed Heating: High Speed Data based on sound measurements made in a Reverberant room on representative units from each cabinet size in 7/28/14 accordance with ARI standard

22 Performance Data - Versatec Ultra Series Versatec Ultra Series - Single Speed - Standard Construction - PSC Free Air Inlet Combined with Casing (Cabinet) Radiated Model Cabinet Mode Fan Only V/H Cooling: High Speed Heating: High Speed Fan Only V/H Cooling: High Speed Heating: High Speed Fan Only V/H Cooling: High Speed Heating: High Speed Fan Only V/H Cooling: High Speed Heating: High Speed Fan Only H Cooling: High Speed Heating: High Speed Fan Only V/H Cooling: High Speed Heating: High Speed Fan Only V/H Cooling: High Speed Heating: High Speed Fan Only V/H Cooling: High Speed Heating: High Speed Fan Only V Cooling: High Speed Heating: High Speed Fan Only V/H Cooling: High Speed Heating: High Speed Fan Only V/H Cooling: High Speed Heating: High Speed Fan Only V/H Cooling: High Speed Heating: High Speed Fan Only V/H Cooling: High Speed Heating: High Speed Data based on sound measurements made in a Reverberant room on representative units from each cabinet size in 7/28/14 accordance with ARI standard

23 Performance Data - Versatec Ultra Series cont. Versatec Ultra Series - Single Speed - Super Quiet Construction - PSC Free Air Inlet Combined with Casing (Cabinet) Radiated Model Cabinet Mode V/H 012 V/H 015 V/H 018 V/H 023 H 024 V/H 030 V/H 036 V/H 041 V 042 V/H 048 V/H 060 V/H Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Not Available Not Available Not Available Not Available Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Fan Only Cooling: High Speed Heating: High Speed Fan Only V/H Cooling: High Speed Heating: High Speed Data based on sound measurements made in a Reverberant room on representative units from each cabinet size in 7/28/14 accordance with ARI standard

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