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VAV-PRC011M-EN 83
DDC Controls
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.
When the space temperature drops below the active heating setpoint, the air valve open to the
Airflow Setpoint Reset Minimum Local Heat and the reheat valve modulates to maintain space
temperature at the active heating setpoint. Control of the water valve uses a separate proportional
plus integral control loop, and its position is dependent on the degree that the space temperature
is below the active heating setpoint and the amount of time that the space temperature has been
below the active heating setpoint.
If the discharge air temperature reaches the Discharge Air Temperature Design Setpoint, the air
valve opens further and modulates between Airflow Setpoint Reset Minimum Local Heat and
Airflow Setpoint Reset Maximum Local Heat to maintain space temperature at the active heating
setpoint, while the water valve modulates to maintain discharge air temperature at the Discharge
Air Temperature Design Setpoint. If the air valve reaches Airflow Setpoint Reset Maximum Local
Heat, the water valve opens further and modulates to maintain space temperature at the active
heating setpoint, while the air valve remains at Airflow Setpoint Reset Maximum Local Heat.
An additional on/off remote heat output is available and energized when the water valve is driven
100% open and de-energized when the water valve reaches 50% open.
In the event that the DAT sensor fails, or is not connected, when the space temperature drops below
the active heating setpoint, the air valve open to the Airflow Setpoint Minimum Local Heat and the
water valve modulates to maintain space temperature at the active heating setpoint.
When reheat is de-energized, the cooling Airflow Minimum Setpoint is enforced.
Single-Duct: On/Off Electric Reheat
One, two, or three stages of staged electric reheat are available. The heating minimum airflow
setpoint is enforced during reheat.
Stage 1 is energized when the space temperature falls below the active heating setpoint and
minimum airflow requirements are met. 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: Pulse-Width Modulation of Electric Heat
One to three stages of pulse-width modulation of electric heat are available. Energizing for a
portion of a three-minute time period modulates the electric heater. This allows for closer matching
- 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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