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VAV-PRC011M-EN 67
Dual-Duct VAV Terminal Units
Acoustics
The acoustical data found in the “Performance Data” section of the VAV catalog is used to make
a determination of the amount of noise the terminal unit will generate. Locate the table for the VAV
terminal unit of interest. Sound power data and an equivalent NC level for an AHRI 885-2008
transfer function is listed.
Example:
VDDF, Cooling-Only Terminal Unit, Size 10 cooling, Size 10 heating (See air Valve Selection)
Cooling Airflow: 1000 cfm
Max. inlet static pressure: 1.5 in. wg
Heating Airflow: 1000 cfm
Max. inlet static pressure: 1.5 in. wg
Interpolation gives sound power data of:
The NC level above is determined by using either the catalog’s AHRI 885-2008 (mineral fiber for
radiated sound) transfer function for the conditions shown in the acoustics table. A different
transfer function could be applied as conditions dictate.
The maximum NC level is NC-40. If the maximum NC level was exceeded, it would have been
necessary to reselect the next larger unit size.
Computer Selection
The advent of personal computers has served to automate many processes that were previously
repetitive and time-consuming. One of those tasks is the proper scheduling, sizing, and selection
of VAV terminal units. Trane has developed a computer program to perform these tasks. The
software is called the Trane Official Product Selection System (TOPSS
™
).
The TOPSS program will take the user’s input specifications and output the properly sized
VariTrane
™
VAV terminal unit along with the specific performance for that size unit.
The program has several required fields, denoted by red shading in the TOPSS program, and many
other optional fields to meet the criteria you have. Required values include maximum and
minimum airflows, control type, and model. If selecting models with reheat, you will be required
to enter information to make that selection also. The user is given the option to look at all the
information for one selection on one screen or as a schedule with the other VAV units on the job.
The user can select single-duct, dual-duct, and fan-powered VAV boxes with the program, as well
as most other Trane products, allowing you to select all your Trane equipment with one software
program.
The program will also calculate sound power data for the selected terminal unit. The user can enter
a maximum individual sound level for each octave band or a maximum NC value. The program will
calculate acoustical data subject to default or user supplied sound attenuation data.
Schedule View: The program has many time-saving features such as: 1) Copy/Paste from
spreadsheets like Microsoft
®
Excel; 2) Easily arranged fields to match your schedule; and 3) Time-
saving templates to store default settings The user can also export the Schedule View to Excel to
modify and put into a CAD drawing as a schedule. Details regarding the program, its operation, and
how to obtain a copy of it are available from your local Trane sales office.
Octave Band 234567NC
Disch. Sound Power 83 72 69 67 66 60 39
Rad. Sound Power 69 63 57 54 47 40 34
- Product Catalog 1
- Introduction 2
- Table of Contents 3
- UC210 BACnet Controller 8
- UC400 BACnet Controller 8
- Air-Fi Wireless System 9
- Wireless Zone Sensor Set 9
- Pneumatic Controller 10
- Binary Input Controller 10
- Features and Benefits 11
- Agency Certifications 12
- Model Number Descriptions 14
- Selection Procedure 17
- General Data 19
- 20 VAV-PRC011M-EN 20
- Performance Data 21
- 22 VAV-PRC011M-EN 22
- VAV-PRC011M-EN 23 23
- 24 VAV-PRC011M-EN 24
- VAV-PRC011M-EN 25 25
- 26 VAV-PRC011M-EN 26
- VAV-PRC011M-EN 27 27
- 28 VAV-PRC011M-EN 28
- VAV-PRC011M-EN 29 29
- 30 VAV-PRC011M-EN 30
- VAV-PRC011M-EN 31 31
- 32 VAV-PRC011M-EN 32
- VAV-PRC011M-EN 33 33
- 34 VAV-PRC011M-EN 34
- VAV-PRC011M-EN 35 35
- 36 VAV-PRC011M-EN 36
- VAV-PRC011M-EN 37 37
- 38 VAV-PRC011M-EN 38
- Electrical Data 39
- 40 VAV-PRC011M-EN 40
- VAV-PRC011M-EN 41 41
- 42 VAV-PRC011M-EN 42
- VAV-PRC011M-EN 43 43
- 44 VAV-PRC011M-EN 44
- VAV-PRC011M-EN 45 45
- 46 VAV-PRC011M-EN 46
- VAV-PRC011M-EN 47 47
- 48 VAV-PRC011M-EN 48
- VAV-PRC011M-EN 49 49
- 50 VAV-PRC011M-EN 50
- Dimensional Data 51
- 52 VAV-PRC011M-EN 52
- VAV-PRC011M-EN 53 53
- 54 VAV-PRC011M-EN 54
- VAV-PRC011M-EN 55 55
- LEFT HAND RIGHT HAND 56
- VAV-PRC011M-EN 59 59
- Mechanical Specifications 60
- Outlet Conection 61
- Hot Water Coils 61
- Electric Heat Coils 61
- Electric Heat Options 61
- Direct Digitals Controls 62
- Control Options 63
- Hot Water Valves 63
- 64 VAV-PRC011M-EN 64
- Dual-Duct VAV Terminal Units 66
- Octave Band 234567NC 67
- Outlet Connection 77
- Direct Digital Controls 77
- Reliable Operation 80
- Safe Operation 80
- System-Level Optimization 80
- Simplified Installation 80
- Controller Flexibility 81
- Control Logic 81
- Space Temperature Control 82
- General Operation-Cooling 82
- Ventilation Control 84
- Flow Tracking Control 85
- General Features and Benefits 88
- ONMARK open protocol 94
- DDC Controls 100
- Air-Fi™ Wireless System 101
- Dimensions 102
- Specifications 102
- DDC Zone Sensor 104
- Wall Sensor and Duct CO 105
- DDC Zone Sensor with LCD 106
- Zone Occupancy Sensor 107
- Two-Position Water Valve 109
- Proportional Water Valve 110
- VAV Piping Package 111
- Transformers 113
- Trane Spring Return Actuator 115
- VariTrane™ DDC Retrofit Kit 116
- Retrofit Kit Actuator 116
- Static Pressure Controller 117
- Pneumatic Controls 121
- Pneumatic Damper Actuator 123
- Reversing Relay 123
- Signal Limiter 125
- VAV-PRC011M-EN 133 133
- Controls Specifications 134
- DDC Retrofit Kit (VRTO) 136
- Retrofit Kit Options 136
- Other Options Available 137
- Application Considerations 138
- Terminal Heat 139
- Dual-Duct Systems 139
- VariTrane VAV Terminal Units 140
- VAV Terminal Unit Types 140
- Fan-Pressure Optimization 141
- Ventilation Reset 141
- Control Types 142
- Pneumatic Control Systems 143
- Room Thermostats 144
- Pneumatic Volume Regulators 144
- Flow Measurement and Control 146
- Accuracy 147
- Air Density Effects 147
- Reheat Options 148
- Electric Reheat 149
- Insulation 150
- Acoustics 150
- Insulation types 151
- Placement of units 151
- Unit Attenuation 151
- Certification and Testing 152
- Duct Design 153
- Best Practices 154
- Unit Conversions 155
- VariTrac™ catalog 157
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