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VAV-PRC011M-EN 139
Application Considerations
Trane's main product in this type of application is called VariTrac™. VariTrane products can also be
used in these systems. (These types of systems are beyond the scope of this manual and are
discussed in detail in the VariTrac II Manual.
Terminal Heat
Remote Heat—In some zones of a single-duct VAV system, perimeter heating equipment, remote
from the terminal unit, is used to add heat to the zone when the cooling load is lower than the
minimum cooling capacity of the VAV terminal unit. Heat is added directly to the zone while cool
supply air continues to enter the zone at a minimum rate for zone ventilation.
Ter mi na l R eh ea t— In some zones of a single-duct VAV system, a minimum flow of cool supply air
is reheated at the terminal unit before entering the zone. Terminal reheat can be provided by
electrical resistance heaters or by hot water coils.
Parallel Fan-Powered Heat—In some zones of a single-duct VAV system, cool supply air at
minimum flow is mixed with warm plenum air before entering the zone at a constant flow rate. A
fan in the terminal unit, in parallel with the central fan, draws air from the plenum whenever the
zone requires heat.
Series Fan-Powered Heat—In some zones of a single-duct VAV system, the airflow to the zone
is held constant, during both heating and cooling, by a terminal unit fan that is in series with the
central fan. The terminal unit fan runs continuously. When the zone requires heat, cool supply air
at minimum flow is mixed with warm, return plenum air before entering the zone.
Dual-Duct Systems
Dual-duct systems have either one or two supply fans and two duct systems. One duct system
carries heated air and the other duct system carries cooled air. Heated air and cooled air are
modulated and/or mixed at each zone in the proper proportions to control zone temperature.
Terminal reheat is not required in a dual-duct system.
Figure 8. Single-fan, dual-duct VAV system
VSD
supply
fan
central air handler
cooling
coil
coil
heating
105°F (40.6°C)
dual-duct
VAV
terminal
units
EA
OA
40°F
(4.4°C)
(23.9°C)
75°F
(12.8°C)
55°F
RA
- 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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