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VAV-PRC011M-EN 91
DDC Controls
General Operation-Cooling
In cooling control action, the DDC controller matches primary airflow to cooling load. The DDC
controller will automatically change over to heating control action if the supply air temperature is
above a configured/editable setpoint. When the supply air temperature is less than 10 degrees
below this setpoint, the controller will automatically switch to cooling control action. The DDC
controller first chooses the Tracer SC -provided supply air temperature value to use for auto
changeover. If this is not available, it uses the temperature provided by the optional auxiliary
temperature sensor (must be installed for inlet temperature monitoring). If this is also not available,
it uses the heating/cooling mode assigned by Tracer SC or the DDC controller’s service tool.
General Operation-Heating and Reheat
In heating control action, the DDC controller matches primary airflow to heating load. The DDC
controller will automatically change over to heating control action if the supply air temperature is
above a configured/editable setpoint. When the supply air temperature is less than 10 degrees
below this setpoint, the controller will automatically switch to cooling control action. The DDC
controller first chooses the Tracer SC -provided supply air temperature value to use for auto
changeover. If this is not available, it uses the temperature provided by the optional auxiliary
temperature sensor (must be installed for inlet temperature monitoring). If this is also not available,
it uses the heating/cooling mode assigned by Tracer SC or the DDC controller’s service tool.
When heat is added to the primary air, the air is considered reheated. Reheat can be either local
(integral to the VAV unit in the form of an electric coil or hot water coil) or remote (typically existing
wall fin radiation, convector, etc.) or any combination of local and remote. The operating
characteristics of the four basic types of VariTrane DDC terminal reheat are discussed.
Single-Duct: On/Off Hot Water Reheat
Three stages of on/off hot water reheat are available. Two-position water valves complete the HW
reheat system and are either fully opened or fully closed. The heating minimum airflow setpoint
is enforced during reheat.
Stage 1 energizes when the space temperature is at or below the heating setpoint. When the zone
temperature rises above the active heating setpoint by 0.5°F (0.28°C), stage 1 is de-energized. Stage
2 energizes when the space temperature is 1°F (0.56°C) or more below the active heating setpoint,
and is de-energized when the space temperature is 0.5°F (0.28°C) below the active heating setpoint.
Stage 3 energizes when the zone temperature is 2°F (1.11°C) or more below the active heating
setpoint, and de-energizes when the space temperature is 1.5°F (0.83°C) below the active heating
setpoint. When reheat is de-energized, the cooling minimum airflow setpoint is enforced.
Single-Duct: Proportional Hot Water Reheat
Proportional hot water reheat uses 3-wire, floating-point-actuator technology.
The heating minimum airflow setpoint is enforced during reheat. The water valve opens as space
temperature drops below the heating setpoint. A separate reheat proportional-plus-integral
control loop from that controlling airflow into the room is enforced.
Water valve position is dependent on the degree that the space temperature is below the active
heating setpoint and the time that the space temperature has been below the active heating
setpoint. If not already closed, the water valve fully closes when the zone temperature rises above
the active heating setpoint by 0.5 °F (0.28 °C).
An additional on/off remote heat output is available and energized when the proportional value is
driven 10% open and de-energized when the proportional valve reaches 50% open.
When reheat is de-energized, the cooling minimum airflow setpoint is enforced. Again, these
reheat devices can be either local or remote.
- 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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