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VAV-PRC011M-EN 17
Single-Duct VAV Terminal Units
The features of the single-duct VAV terminal units are described by the product categories shown
in bold. Within each category the available options are listed.
Selection Procedure
This section describes the catalog selection of single-duct VAV terminal units with specific
examples. A computer selection program is also available to aid in selection of VAV terminal units.
Selection of single-duct VAV terminal units can involve three elements:
• Air valve selection
• Heating coil selection (if required)
• Acoustics controls
Air Valve Selection
The wide-open static pressure and airflows are found in the performance data section of the
catalog. To select an air valve, locate the required design cooling airflow for your terminal unit type
and find the smallest air valve size that has a pressure drop equal to or lower than the maximum
wide-open static pressure requirement.
Selection Example: Cooling Only VCCF Terminal Unit
Design cooling airflow: 1700 cfm
Maximum wide open Air pressure drop: 0.25 in. wg
Minimum cooling airflow: 850 cfm
From the performance data charts, select a valve size 12, which has a wide-open static pressure
drop of 0.01 in. wg
Check the minimum and maximum cfm desired with the minimum and maximum cfm allowed in
the table in the general data section. The maximum setting of 1700 cfm is within the acceptable
range. The desired minimum setting of 850 cfm is acceptable for the cooling only box desired. Note
that if an electric reheat box was selected, the minimum cfm would be dependent upon the kW of
the electric heater. (See Electric Heat Unit Selection.)
Heating Coil Selection (If required)
First, determine the amount of heat required to meet space and downstream duct heat losses from
a load calculation.
Hot Water Heat
Select a hot water coil sufficient to meet the design heat loss.
Example:
VCWF, Hot Water Unit Heat, Size 12 (See Air Valve Selection)
Heating airflow: 850 cfm
Hot water flow: 1.0 gpm
Design Heat Loss: Q =25 MBh
Select hot water coil from the coil performance table in the Performance Data section of the catalog.
Selection:
A one-row coil is sufficient to meet design conditions. From the Hot Water Coil Capacity Data of the
Performance Data Section, a one-row coil for a size 12 air valve will operate at the above conditions
as follows:
Coil Capacity: 25.17 MBh
Water pressure drop: 0.72 ft WPD
- 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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