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18 VAV-PRC011M-EN
Single-Duct VAV Terminal Units
Air pressure drop (APD) of the hot water coil is included in the chart preceding the hot water coil
performance data section.
APD = 0.35 in. wg
Electric Heat
Determine the kW required to meet zone design heat loss.
kW=MBh / 3.414
MBh=Design Heat Loss
Select the nearest available kW with voltage and steps desired from the electric heater kW guideline
table in the Performance Data section of the catalog.
Example
VCEF, Electric Unit Heat, Size 12 (See Air Valve Selection)
Heating airflow: 850 cfm
Voltage: 277/60/1 VAC
Design Heat Loss: Q=25 MBh
kW=Q/3.414
kW=25/3.414
kW=7.3
Selection:
Select 7.5 kW from the electric heat table in the voltage and stages required. The table shows the
minimum cfm allowable for the kW selected. The static pressure requirement is shown as 0.06 in.
wg for this example with a design cooling flow of 1700 cfm.
Check Leaving Air Temperature:
T is the primary entering air temperature 55°F for this example.
Decide if leaving air temperature of 82.8°F is satisfactory for your application.
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
VCCF, Cooling-Only Terminal Unit, Size 10 (See air Valve Selection)
Cooling Airflow: 1100 cfm
Maximum 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.
LAT
Q
1.085 CFM×
-------------------------------------
T+=
LAT
3414 7.5×
1.085 850×
-----------------------------------
55 82.8=+=
Octave Band 2 3 4 5 6 7 NC
Disch Sound Power 68686565 605728
Rad Sound Power 63 58 54 47 39 32 29
- 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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