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VVT bypass damper / duct static pressure controller (terminal zoning) · BACnet points list
Carrier VVT Bypass II BACnet points list
Updated 4 November 2026
The VVT Bypass II holds supply duct static pressure in a Carrier VVT system by modulating its own bypass damper actuator, an external actuator or the air source fan VFD through a 0-10 Vdc output. It talks BACnet MS/TP or BACnet ARC156 and is normally linked to the VVT Master and air source. Its BACnet points are mostly read-only status: static pressure, the controlling setpoint, damper or VFD output, supply air temperature and two alarms.
This page lists 19 BACnet objects for the Carrier VVT Bypass II — 6 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from Carrier’s own free documentation, linked below.
- Manufacturer
- Carrier
- Model
- VVT Bypass II
- Equipment
- VVT bypass damper / duct static pressure controller (terminal zoning)
- Equipment type
- VAV boxes & fan coils
- BACnet objects
- 19 (6 writable)
- Transport
- BACnet MS/TP, BACnet ARC156
- Firmware
- Not stated
- Also known as
- OPN-VVTBP-02, VVT Bypass II controller, i-Vu VVT Bypass, 11-808-601-01
Reference only, provided as-is: verify against Carrier’s current documentation and the live device before use. Not official Carrier information. Terms of use.
BMS integration notes: Carrier VVT Bypass II
This is a monitoring device for a BMS: the static pressure loop runs inside the controller and through Carrier linkage. Read duct static pressure, the setpoint in use and the damper or VFD output, and alarm on supply air temperature and linkage failure.
Minimum points to map
The short list most integrators start with — enough to run the unit from a BMS. Map more as the job needs.
| Object | Name | Why | Access |
|---|---|---|---|
| AV 1016 | static_press | Measured supply duct static pressure, in H2O | Read |
| AV 1015 | sys_press_stpt | Static pressure setpoint currently in use | Read |
| AV 1013 | dpr_pos | Bypass damper position, % | Read |
| AV 1014 | vfd_output | Fan VFD output when VFD control is set, % | Read |
| AV 1008 | sa_temp | Supply air temperature | Read |
| BV 1013 | lat_control | Raising pressure to protect against SAT limits | Read |
| BV 7004 | sat_alarm | Supply air temperature outside the SAT limits | Read |
| BV 7030 | air_linkage_fail | Linkage to the air source lost | Read |
Network setup
- MS/TP address is set on the Tens and Ones rotary switches; the factory 00 must be changed.
- MS/TP baud (9600 to 76.8 kbps) is set on DIP switches; ARC156 runs at 156 kbps via the ARC156/MS/TP jumper.
- Control Device Type (BV:99002) selects actuator (0) or VFD (1) output.
Watch out for
- If the supply air temperature reaches the Minimum Cooling SAT (45 °F) or Maximum Heating SAT (120 °F), the controller switches to its LAT static pressure setpoint and reports the airflow increase (AV:5002).
- If static pressure drops below 10% of setpoint with the damper shut (or VFD at max) for 1 minute, the controller assumes the fan is off and parks the damper at 65%.
Carrier VVT Bypass II BACnet objects
Type: AI, AO, AV, BI, BO, BV, MI/MO/MV (multi-state) · Access: Read read-only, Write writable, Command writable with a priority array.
| Description | States | |||||
|---|---|---|---|---|---|---|
| AVmin | 1008 | sa_temp | Supply Air Temperature | °F | Read | |
| AVmin | 1013 | dpr_pos | Damper Position | % | Read | |
| AVmin | 1014 | vfd_output | VFD output | % | Read | |
| AVmin | 1015 | sys_press_stpt | Controlling Pressure Setpoint | in H2O | Read | |
| AVmin | 1016 | static_press | Static Pressure - Prime Variable | in H2O | Read | |
| AV | 2608 | link_sat | Air Source Supply Air Temp | °F | Read | |
| AV | 3016 | press_hysteresis | Pressure Control Deadband (default 0.05) | in H2O | Write | |
| AV | 5002 | lat_airflow_inc | LAT Airflow Increase | % | Read | |
| AV | 5003 | max_press_stpt | Maximum Duct Pressure Setpoint | in H2O | Read | |
| AV | 9007 | start_delay | Power Fail Restart Delay (default 60) | sec | Write | |
| AV | 83003 | sat_cl_min | Minimum Cooling SAT (default 45) | °F | Write | |
| AV | 83004 | sat_ht_max | Maximum Heating SAT (default 120) | °F | Write | |
| BVmin | 1013 | lat_control | LAT Control | Read | 0=Off; 1=Active | |
| BV | 2601 | a_link_status | Airside Linkage Status | Read | 0=Not Active; 1=Active | |
| BVmin | 7004 | sat_alarm | Supply Air Temperature Alarm | Read | 0=Normal; 1=Alarm | |
| BVmin | 7030 | air_linkage_fail | Airside Linkage Alarm | Read | 0=Normal; 1=Alarm | |
| BV | 99002 | ctrl_type | Control Device Type (default Inactive (0)) | Write | 0=Actuator; 1=VFD | |
| BV | 99003 | auto_adjust | Automatic Deadband Adjustment (default Active (1)) | Write | 0=Disable; 1=Enable | |
| MV | 2005 | link_ahu_mode | Air Source Mode | Read | 1=Off; 2=Warmup; 3=Heat; 4=Cool; 5=Freecool; 6=Pressure; 7=Evac; 8=Vent |
No points match these filters.
Object ID lookup: Carrier VVT Bypass II point IDs by name
AV1008sa_tempAV1013dpr_posAV1014vfd_outputAV1015sys_press_stptAV1016static_pressAV2608link_satAV3016press_hysteresisAV5002lat_airflow_incAV5003max_press_stptAV9007start_delayAV83003sat_cl_minAV83004sat_ht_maxBV1013lat_controlBV2601a_link_statusBV7004sat_alarmBV7030air_linkage_failBV99002ctrl_typeBV99003auto_adjustMV2005link_ahu_mode
Integration notes
- The duct static pressure setpoint itself is not in the BACnet list; Controlling Pressure Setpoint (AV:1015) only reports the setpoint in use.
- Damper Position applies when the controller drives a damper; VFD output applies when Control Device Type is set to VFD.
- With linkage active the controller uses the air source's supply air temperature and follows its Pressurization mode.
Check it against the live device. A points list tells you what the controller can expose; the unit in front of you may differ by firmware or installed options. This list is provided as-is for reference only and may contain mistakes — confirming it before you write, map or commission anything is up to you (terms). Easy BACnet scans a network for BACnet IP devices from an Android phone, reads every object on the VVT Bypass II and exports what it actually has to Excel — free. New to BACnet? Start with what a BACnet points list is and what the object types mean.
Questions about the Carrier VVT Bypass II
How many BACnet points does the Carrier VVT Bypass II have?
This list has 19 BACnet objects: 12 analog values, 6 binary values, 1 multi-state value. The exact set on a given unit depends on its firmware, installed options and configuration.
Which Carrier VVT Bypass II BACnet points are writable?
6 of the 19 objects accept a write. Points marked Command have a priority array: a write holds until it is released, so release it back to automatic when you are done.
Where is the official Carrier VVT Bypass II BACnet documentation?
The source is VVT Bypass II Controller Installation and Start-up Guide (Appendix B: BACnet points list) (11-808-601-01), revision 2026-01-28, published free by Carrier at https://www.shareddocs.com/hvac/docs/1000/Public/02/11-808-601-01.pdf.
What are the minimum BACnet points to integrate the Carrier VVT Bypass II?
Start with AV 1016 static_press (Measured supply duct static pressure, in H2O); AV 1015 sys_press_stpt (Static pressure setpoint currently in use); AV 1013 dpr_pos (Bypass damper position, %); AV 1014 vfd_output (Fan VFD output when VFD control is set, %); AV 1008 sa_temp (Supply air temperature); BV 1013 lat_control (Raising pressure to protect against SAT limits); BV 7004 sat_alarm (Supply air temperature outside the SAT limits); BV 7030 air_linkage_fail (Linkage to the air source lost).
How do I check these points on the real VVT Bypass II?
Scan the network with a BACnet IP browser such as Easy BACnet, open the device and compare its object list with this table. Anything missing is usually an option that isn't installed or a point that is disabled in the controller's configuration.
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Carrier VAV Zone II
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Carrier VVT Zone II
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Also known as: 48N, 50N, 48N2, 50N9, 48/50N, WeatherExpert, 48-50N-8T, UPC Open, ComfortLink - Packaged rooftop unit controller (BACnet option)
Carrier WeatherMaker 48/50A Rooftop (ComfortLink, UPC Open BACnet option)
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Also known as: 48/50A, 48A, 50A, 48/50A020-060, WeatherMaker 48/50A, UPC Open, ComfortLink, 48-50A-17T - Packaged rooftop unit controller (BACnet option)
Carrier WeatherMaker 48/50A2-A5 020-060 Rooftop (ComfortLink 8.x, UPC Open BACnet option)
Carrier WeatherMaker 48/50A2, A3, A4 and A5 020-060 single-package large rooftop units with ComfortLink version 8.x controls and the UPC Open BACnet option.
Also known as: 48/50A2, 48/50A3, 48/50A4, 48/50A5, 48A2, 50A2, 48/50A020-060, WeatherMaker 48/50A, ComfortLink 8.x, UPC Open, 48/50A-13T, 48_50A-13T - Packaged rooftop unit controller (BACnet option)
Carrier Weathermaster 48/50P Large Rooftop (ComfortLink, UPC Open BACnet option)
Carrier Weathermaster 48/50P030-100 single-package large rooftop units with ComfortLink 9.x controls and the factory UPC Open BACnet option.
Also known as: 48/50P, 48P, 50P, 48/50P030-100, Weathermaster 48/50P, UPC Open, ComfortLink, 48-50P-15T - Packaged rooftop unit controller (BACnet option)
Carrier Weathermaster 48/50P2-P5 030-100 Large Rooftop (ComfortLink 7.x, UPC Open BACnet option)
Carrier Weathermaster 48/50P2, P3, P4 and P5 030-100 single-package large rooftop units with ComfortLink version 7.x controls and the UPC Open BACnet option.
Also known as: 48/50P2, 48/50P3, 48/50P4, 48/50P5, 48P2, 50P2, 48/50P030-100, Weathermaster 48/50P, ComfortLink 7.x, UPC Open, 48/50P-8T, 48_50P-8T - Water-source heat pump controller
Carrier WSHP Open v3
Carrier water-source heat pumps fitted with the WSHP Open multi-protocol controller.
Also known as: WSHP Open, WSHP-Open, Carrier water source heat pump controller, 11-808-539-01
Source: VVT Bypass II Controller Installation and Start-up Guide (Appendix B: BACnet points list) · 11-808-601-01 · rev. 2026-01-28. Object names, instances and units are reproduced as published; descriptions are our own.