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Fan coil unit controller · BACnet points list
Carrier Fan Coil Open BACnet points list
Updated 28 October 2026
The Fan Coil (OPN-FC) controller ships as an integrated part of Carrier packaged fan coil units. DIP switches and the communications selector choose BACnet MS/TP (the default), BACnet ARC156, Modbus or N2, and a LonWorks option card is available. The default device instance is 16101 followed by the two-digit rotary address. Points cover setpoints, space and supply temperatures, fan speed and valve outputs, 2-pipe changeover, alarms and the 'system' points a BAS writes in place of local sensors.
This page lists 80 BACnet objects for the Carrier Fan Coil Open — 33 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
- Fan Coil Open
- Equipment
- Fan coil unit controller
- Equipment type
- VAV boxes & fan coils
- BACnet objects
- 80 (33 writable)
- Transport
- BACnet MS/TP, BACnet ARC156
- Firmware
- Not stated
- Default device instance
- 16101xx (xx = rotary switch address)
- Also known as
- OPN-FC, Carrier Fan Coil controller, 11-808-540-01
BMS integration notes: Carrier Fan Coil Open
Set the Fan Coil Open for BACnet MS/TP with its DIP switches and rotary address. Disable the local Occupancy Schedules so the BAS can command occupancy through keypad_ovrde, then write setpoints directly. Space temperature, humidity, CO2, OAT and 2-pipe water temperature from the BMS go into the system_* points at priority 16 and have to be refreshed within each point's window.
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 |
|---|---|---|---|
| MV 1 | keypad_ovrde | BAS occupancy command: occupied/unoccupied | Write |
| BV 9001 | shutdown | Network shutdown command | Write |
| AV 3001 | occ_cl_stpt | Occupied cooling setpoint | Write |
| AV 3002 | occ_ht_stpt | Occupied heating setpoint | Write |
| MV 2002 | run_status | Current system mode | Read |
| BV 2008 | occ_status | Confirms occupied/unoccupied | Read |
| AV 2007 | space_temp | Space temperature the unit controls to | Read |
| AV 1008 | sa_temp | Supply air temperature | Read |
| BV 7008 | sfan_fail_alarm | Supply fan failure alarm | Read |
| BV 7028 | overflow_alarm | Condensate overflow alarm; stops the fan | Read |
Enable & remote start
The unit runs occupied 24/7 until a schedule or the BAS takes over. Disable Occupancy Schedules (Configuration > Unit Configuration) so the BAS can control it, then write BAS On/Off keypad_ovrde (MSV:1 in the points list): 1=Inactive, 2=Occupied, 3=Unoccupied. Shutdown (BV:9001) stops the unit from the network. Cool Enable (BV:1011) and Heat Enable (BV:1012) lock out cooling or heating.
Heartbeat & communication loss
No general heartbeat. Each system point is only used while it is refreshed within its window: space temperature 1 min / 5 min, RH and CO2 5 min / 10 min, OAT and water temperature 5 min / 60 min.
Sensors & values from the BMS
Write system_spt (AV:1902), system_rh (AV:1904), system_iaq (AV:1903), system_oat (AV:1901), system_water_temp (AV:1905) and system_stpt_adj (AV:1913) at BACnet priority 16, no more than once a minute. A network value overrides the local sensor while it is refreshed in time. system_water_temp sets the 2-pipe changeover mode and takes priority over the local changeover sensor. The controller clears a system point after processing it, so read the matching control point instead (space_temp, space_rh, iaq, oa_temp, chgovr_mode) at least 30 s after the write.
Network setup
- MS/TP MAC address is set on the rotary switches (tens and ones); valid 1-99. The address is read only at power-up.
- Default device instance is 16101xx (xx = rotary address); it can be changed with an Equipment Touch.
- Baud is set on DIP 1-2 (9600/19.2k/38.4k/76.8k); 76.8k is the default; 8N1 fixed. DIP 3 and 4 both Off = BACnet MS/TP.
- Set the communications selector to EIA-485; switch changes only take effect after a power cycle.
- Max Masters defaults to 127 and Max Info Frames to 10 (adjustable via Equipment Touch). The controller counts as a full load on the MS/TP bus.
Watch out for
- System points must be written at priority 16; writes at any other priority are ignored.
- Never write a system point more than once per minute (60 s).
- Only controllers set as MS/TP masters answer Who-Is.
- The guide says the unit accepts three network demand-limit levels, but cool_demand_level (AV:9006) and heat_demand_level (AV:9036) are listed read-only.
- Some points only apply with certain options (2-pipe changeover, electric heat, DCV damper, reheat, humidity sensor, linkage).
Carrier Fan Coil Open 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 | |||||
|---|---|---|---|---|---|---|
| AV | 9002 | oat_cl_lockout | Cooling Lockout Temperature (default 45) | °F | Write | |
| AV | 2025 | clg_output | Cooling Output | % | Read | |
| AV | 2022 | oa_dpr_pos | Damper Output | % | Read | |
| AV | 3005 | eff_cl_stpt | Effective Cool Setpoint | °F | Read | |
| AV | 3006 | eff_ht_stpt | Effective Heat Setpoint | °F | Read | |
| AV | 2019 | filter_service_hrs | Filter Service Alarm Timer (default 600) | hr | Write | |
| AV | 9003 | oat_ht_lockout | Heating Lockout Temperature (default 65) | °F | Write | |
| AV | 2026 | htg_output | Heating Output | % | Read | |
| AV | 3011 | occ_dehum_stpt | Occ Relative Humidity Setpoint (default 60) | %rh | Write | |
| AV | 9026 | optm_start | Optimal Start (default 1) | hr | Write | |
| AV | 2016 | ovrde_time | Override Time Remaining | min | Read | |
| AV | 9007 | start_delay | Power Fail Restart Delay (default 5) | seconds | Write | |
| AV | 1010 | ra_temp | Return Air Temperature | °F | Read | |
| AV | 1003 | oa_temp | Outdoor Air Temperature | °F | Read | |
| AVmin | 3001 | occ_cl_stpt | Occupied cool setpoint | °F | Write | |
| AV | 1006 | stpt_adj | Setpoint Adjustment | °F | Read | |
| AV | 9015 | stpt_adj_range | Setpoint Adjustment Range (default 5) | °F | Write | |
| AV | 1011 | space_rh | Space Relative Humidity | %rh | Read | |
| AVmin | 2007 | space_temp | Space Temperature - Prime Variable | °F | Read | |
| AV | 1901 | system_oat | System Outdoor Air Temperature (default -999) | °F | Write | |
| AV | 1913 | system_stpt_adj | System Setpoint Adjustment (default -999) | °F | Write | |
| AV | 1903 | system_iaq | System Space AQ (default -999) | Write | ||
| AV | 1904 | system_rh | System Space RH (default -999) | % | Write | |
| AV | 1902 | system_spt | System Space Temperature (default -999) | °F | Write | |
| AV | 1905 | system_water_temp | System Water Temperature (default -999) | °F | Write | |
| AV | 3012 | unocc_dehum_stpt | Unocc Relative Humidity Setpoint (default 95) | %rh | Write | |
| BV | 1014 | chgovr_mode | Changeover Mode | Read | 0=Off; 1=On | |
| BVmin | 7028 | overflow_alarm | Condensate Overflow | Read | 0=Normal; 1=Alarm | |
| BV | 1011 | cl_enable | Cool Enable (default Enable) | Write | 0=Disable; 1=Enable | |
| BV | 2006 | dehum_status | Dehumidification | Read | 0=Inactive; 1=Active | |
| BV | 7017 | filter_alarm | Filter | Read | 0=Normal; 1=Alarm | |
| BV | 7007 | fire_alarm | Fire / Smoke Shutdown | Read | 0=Normal; 1=Alarm | |
| BV | 1012 | ht_enable | Heat Enable (default Enable) | Write | 0=Disable; 1=Enable | |
| BV | 7011 | spt_hi_alarm | High Space Temperature | Read | 0=Normal; 1=Alarm | |
| BV | 7005 | iaq_alarm | Indoor Air Quality | Read | 0=Normal; 1=Alarm | |
| BV | 7012 | spt_lo_alarm | Low Space Temperature | Read | 0=Normal; 1=Alarm | |
| BVmin | 2008 | occ_status | Occupancy Status | Read | 0=Unoccupied; 1=Occupied | |
| BV | 1015 | reht_enable | Reheat Enable (default Disable) | Write | 0=Disable; 1=Enable | |
| BV | 7517 | filter_rntm_clr | Reset Filter Alarm (default Inactive) | Write | 0=Off; 1=On | |
| BV | 7035 | rat_alarm | Return Air Temperature | Read | 0=Normal; 1=Alarm | |
| BV | 1013 | stpt_adj_enable | Setpoint Adjustment (default Enable) | Write | 0=Disable; 1=Enable | |
| BVmin | 9001 | shutdown | Shutdown (default Inactive) | Write | 0=Inactive; 1=Active | |
| BV | 7018 | sprh_hi_alarm | Space Relative Humidity | Read | 0=Normal; 1=Alarm | |
| BV | 7004 | sat_alarm | Supply Air Temperature | Read | 0=Normal; 1=Alarm | |
| BVmin | 7008 | sfan_fail_alarm | Supply Fan Failure | Read | 0=Normal; 1=Alarm | |
| MV | 2004 | fan_run | Fan / Speed | Read | 1=Off; 2=Low; 3=Med; 4=High; 5=On | |
| MV | 2009 | start_type | Optimal Start Type (default 2) | Write | 1=None; 2=Temp Compensated; 3=Learning Adaptive | |
| MVmin | 2002 | run_status | System Mode | Read | 1=Off; 2=Fan Only; 3=Economize; 4=Cooling; 5=Heating; 6=Cont Fan; 7=Test; 8=Start Delay; 9=Temper SAT; 10=Fire Shutdown; 11=Shutdown; 12=IAQ Override; 13=Dehumidify | |
| AVmin | 3002 | occ_ht_stpt | Occupied heat setpoint | °F | Write | |
| AV | 3003 | unocc_cl_stpt | Unoccupied cool setpoint | °F | Write | |
| AV | 3004 | unocc_ht_stpt | Unoccupied heat setpoint | °F | Write | |
| AV | 4005 | econ_min | Vent Dmpr Pos / DCV Min Pos (default 20) | % | Write | |
| AV | 1009 | iaq | Indoor Air Quality CO2 (ppm) | ppm | Read | |
| BV | 7037 | llt_alarm | Freezestat | Read | 0=Normal; 1=Alarm | |
| BV | 7001 | spt_fail | Space Temp Sensor | Read | 0=Normal; 1=Alarm | |
| BV | 7029 | oat_fail | Outdoor Air Temp Sensor | Read | 0=Normal; 1=Alarm | |
| AV | 9028 | occ_ovr_delay | Occ Override Delay (default 15) | min | Write | |
| BV | 1016 | fan_cycle | Unoccupied Fan Cycling (default Enable) | Write | 0=Disable; 1=Enable | |
| AVmin | 1008 | sa_temp | Supply Air Temperature | °F | Read | |
| BV | 7033 | link_therm_fail | Thermostat Linkage | Read | 0=Normal; 1=Alarm | |
| AV | 83004 | sat_ht_max | Maximum Heating SAT (default 110) | °F | Write | |
| AV | 83003 | sat_cl_min | Minimum Cooling SAT (default 50) | °F | Write | |
| MV | 2005 | link_ahu_mode | Air Source Mode | Read | 1=Off; 2=Warmup; 3=Heat; 4=Cooling; 5=Freecool; 6=Pressure; 7=Evac; 8=Vent | |
| MV | 2003 | spt_status | Space Temp Source | Read | 1=Sensor Failure; 2=SPT Sensor; 3=RAT / T55; 4=Network; 5=Airside Linkage; 6=Locked Value; 7=T-Stat Linkage; 8=ZS Sensor | |
| BV | 7051 | zst_sensor_fail | ZS Temp Sensor | Read | 0=Normal; 1=Alarm | |
| AV | 9006 | cool_demand_level | System Cooling Demand Level | Read | ||
| AV | 9036 | heat_demand_level | System Heating Demand Level | Read | ||
| AV | 2608 | link_sat | Air Source Supply Air Temp | °F | Read | |
| BV | 7030 | air_linkage_fail | Airside Linkage | Read | 0=Normal; 1=Alarm | |
| AV | 9024 | fan_delay_off | Fan Off Delay (default 90) | seconds | Write | |
| BV | 7034 | chgovr_fail | Changeover Sensor | Read | 0=Normal; 1=Alarm | |
| BV | 2009 | frz_status | Freezestat | Read | 0=Normal; 1=Alarm | |
| AV | 2015 | filter_rntm | Filter Runtime | hr | Read | |
| BV | 2601 | a_link_status | Airside Linkage | Read | 0=Not Active; 1=Active | |
| AV | 9025 | fan_delay_on | Fan On Delay (default 10) | seconds | Write | |
| BV | 7032 | spt_sensor_fail | SPT Sensor | Read | 0=Normal; 1=Alarm | |
| MVmin | 1 | keypad_ovrde | BAS On / Off (default 1) | Write | 1=Inactive; 2=Occupied; 3=Unoccupied | |
| BV | 2801 | t_link_status | Thermostat Linkage | Read | 0=Not Active; 1=Active | |
| BV | 1003 | sfan_status | Supply Fan Status | Read | 0=Off; 1=On | |
| BV | 7055 | zs_config_fail | ZS Sensor Configuration | Read | 0=Normal; 1=Alarm |
No points match these filters.
Integration notes
- System points (system_spt, system_rh, system_iaq, system_oat, system_water_temp, system_stpt_adj) must be written at BACnet priority 16 and no more than once per minute; -999 means no network value.
- The guide's generic system-point table also lists system_oaq (AV:1908), oae (BV:1901), press_override (BV:1906) and fire_shutdown (BV:1907). They are not in the Fan Coil points list, so they are left out here.
- The points list gives BAS On/Off (keypad_ovrde) as MSV:1, while the system-point table in the same guide shows msv:1001 as on other Open controllers. Check which instance the controller exposes.
- Defaults in the points list differ from the sequence text for Fan On Delay (10 s vs 30 s), Fan Off Delay (90 s vs 120 s) and Power Fail Restart Delay (5 s vs 60 s); check on the controller.
- Occ Override Delay (AV:9028) is listed twice in the source; it is kept once here. Several display names in the source are just 'Setpoint'; the object name tells you which one.
- Each point also has a Modbus register in the same table; only the BACnet side is captured here.
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. Easy BACnet scans a network for BACnet IP devices from an Android phone, reads every object on the Fan Coil Open 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 Fan Coil Open
How many BACnet points does the Carrier Fan Coil Open have?
This list has 80 BACnet objects: 41 analog values, 33 binary values, 6 multi-state values. The exact set on a given unit depends on its firmware, installed options and configuration.
Which Carrier Fan Coil Open BACnet points are writable?
33 of the 80 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 Fan Coil Open BACnet documentation?
The source is Fan Coil Integration Guide (Appendix A: Fan Coil Network Points List) (11-808-540-01), revision 2022-07-21, published free by Carrier at https://www.shareddocs.com/hvac/docs/1000/Public/0E/11-808-540-01.pdf.
What are the minimum BACnet points to integrate the Carrier Fan Coil Open?
Start with MV 1 keypad_ovrde (BAS occupancy command: occupied/unoccupied); BV 9001 shutdown (Network shutdown command); AV 3001 occ_cl_stpt (Occupied cooling setpoint); AV 3002 occ_ht_stpt (Occupied heating setpoint); MV 2002 run_status (Current system mode); BV 2008 occ_status (Confirms occupied/unoccupied); AV 2007 space_temp (Space temperature the unit controls to); AV 1008 sa_temp (Supply air temperature); BV 7008 sfan_fail_alarm (Supply fan failure alarm); BV 7028 overflow_alarm (Condensate overflow alarm; stops the fan).
How do I enable BMS control of the Carrier Fan Coil Open?
The unit runs occupied 24/7 until a schedule or the BAS takes over. Disable Occupancy Schedules (Configuration > Unit Configuration) so the BAS can control it, then write BAS On/Off keypad_ovrde (MSV:1 in the points list): 1=Inactive, 2=Occupied, 3=Unoccupied. Shutdown (BV:9001) stops the unit from the network. Cool Enable (BV:1011) and Heat Enable (BV:1012) lock out cooling or heating.
Does the Carrier Fan Coil Open need a BACnet heartbeat or have a communication timeout?
No general heartbeat. Each system point is only used while it is refreshed within its window: space temperature 1 min / 5 min, RH and CO2 5 min / 10 min, OAT and water temperature 5 min / 60 min.
Can the BMS supply sensor values to the Carrier Fan Coil Open?
Write system_spt (AV:1902), system_rh (AV:1904), system_iaq (AV:1903), system_oat (AV:1901), system_water_temp (AV:1905) and system_stpt_adj (AV:1913) at BACnet priority 16, no more than once a minute. A network value overrides the local sensor while it is refreshed in time. system_water_temp sets the 2-pipe changeover mode and takes priority over the local changeover sensor. The controller clears a system point after processing it, so read the matching control point instead (space_temp, space_rh, iaq, oa_temp, chgovr_mode) at least 30 s after the write.
How do I check these points on the real Fan Coil Open?
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.
More Carrier BACnet points lists
- Water-cooled screw chiller controller (BACnet option)
Carrier 30HXA / 30HXC 076-271 Series 9 (UPC Open BACnet option)
Carrier 30HXA condenserless and 30HXC water-cooled screw chillers, sizes 076-271, Series 9 with ComfortLink controls and the BACnet communication option.
Also known as: 30HX, 30HXA, 30HXC, 30HX-2T, UPC Open, ComfortLink, screw chiller - Applied rooftop unit controller
Carrier 48/50K and 48/50V Rooftop (SmartVu PIC 6.1)
Carrier 48/50K and 48/50V applied rooftop units (gas heat or electric heat, R-454B) with SmartVu controls on PIC 6.1 hardware.
Also known as: SmartVu, PIC 6.1, PIC6.1, 48K, 50K, 48V, 50V, 48/50K, 48/50V, Carrier applied rooftop, 48-50-ART-SVU-1T - Water-cooled centrifugal chiller controller
Carrier AquaEdge 19DV (PIC6)
Carrier AquaEdge 19DV two-stage centrifugal chillers with the PIC6 controller.
Also known as: 19DV, AquaEdge 19DV, PIC6, 19DV-CLT-3T, centrifugal chiller - Water-cooled centrifugal chiller controller
Carrier AquaEdge 19MV (PIC6)
Carrier AquaEdge 19MV two-stage semi-hermetic centrifugal chillers with Greenspeed Intelligence (magnetic bearings) and PIC6 controls.
Also known as: 19MV, AquaEdge 19MV, 19MV-CLT-3T, PIC6, magnetic bearing centrifugal chiller - Water-cooled centrifugal chiller controller
Carrier AquaEdge 19XR (PIC 5)
Carrier AquaEdge 19XR two-stage semi-hermetic centrifugal chillers with PIC 5 controls.
Also known as: 19XR, AquaEdge 19XR, PIC 5, PIC5, 19XR-CLT-3T, centrifugal chiller - Water-cooled screw chiller controller
Carrier AquaEdge 23XRV (PIC6)
Carrier AquaEdge 23XRV variable-speed water-cooled screw chillers with the PIC6 touchscreen controller.
Also known as: 23XRV, AquaEdge 23XRV, PIC6, 23XRV-3T, variable speed screw chiller - Air-cooled screw chiller controller (BACnet option)
Carrier AquaForce 30XA 080-501 (UPC Open BACnet option)
Carrier AquaForce 30XA080-501 air-cooled screw chillers with the BACnet communication option (UPC Open controller).
Also known as: 30XA, AquaForce 30XA, 30XA-7T, UPC Open, Carrier Controller, screw chiller - Air-cooled screw chiller (via BACnet translator)
Carrier AquaForce 30XA 140-352 (BACnet/Modbus Translator)
Carrier AquaForce 30XA 140-352 air-cooled screw chillers with Touch Pilot controls and the factory BACnet/Modbus translator.
Also known as: 30XA, AquaForce 30XA, 30XA-100T, Touch Pilot, BACnet/Modbus translator - Air-cooled screw chiller controller
Carrier AquaForce 30XV 140-500 Series B (PIC6.1 Carrier Controller)
Carrier AquaForce 30XV140-500 Series B variable-speed air-cooled screw chillers with the PIC6.1 Carrier Controller and version 9.x software.
Also known as: 30XV, AquaForce 30XV, 30XV Series B, 30XV-6T, PIC6.1, Carrier Controller, Greenspeed - Scroll chiller / heat pump controller
Carrier AquaSnap 30MP (PIC6 Carrier Controller)
Carrier AquaSnap 30MPW017-080 water-cooled, 30MPA021-080 condenserless and 30MPQ021-080 heat pump chillers with scroll compressors and PIC6 (Carrier Controller).
Also known as: 30MPW, 30MPA, 30MPQ, 30MP, AquaSnap 30MP, 30MP-8T, Carrier Controller - Air-cooled scroll chiller controller (BACnet option)
Carrier AquaSnap 30RAP 010-150 (UPC Open BACnet option)
Carrier AquaSnap 30RAP010-150 air-cooled chillers and 30RAP011-060 with Greenspeed Intelligence (R-410A, ComfortLink controls) fitted with the BACnet communication option.
Also known as: 30RAP, AquaSnap 30RAP, 30RAP-8T, 30RAP Greenspeed, UPC Open, ComfortLink - Air-cooled scroll chiller controller (BACnet option)
Carrier AquaSnap 30RB 060-390 (UPC Open BACnet option)
Carrier AquaSnap 30RB060-390 air-cooled chillers and 30RB080-390 with Greenspeed Intelligence (ComfortLink controls) fitted with the BACnet communication option.
Also known as: 30RB, AquaSnap 30RB, 30RB-8T, 30RB Greenspeed, UPC Open, ComfortLink - Air-cooled scroll chiller controller
Carrier AquaSnap 30RC 010-060
Carrier AquaSnap 30RC 010-060 air-cooled scroll chillers (with or without Greenspeed fans) using the Carrier Controller.
Also known as: 30RC, AquaSnap 30RC, 30RC-101T, Carrier Controller, 30RC BACnet IP - Networked room thermostat
Carrier ComfortVu BACnet Thermostat
Carrier ComfortVu wall thermostats controlling fan coils or AC/heat pump units.
Also known as: ComfortVu, Carrier ComfortVu, 11-808-726-01 - Rooftop unit controller
Carrier RTU Open v5
Carrier packaged rooftop units and heat pumps retrofitted or factory-fitted with the RTU Open controller.
Also known as: RTU Open, OPN-RTU, RTU-Open, 11-808-697-01 - 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: Fan Coil Integration Guide (Appendix A: Fan Coil Network Points List) · 11-808-540-01 · rev. 2022-07-21. Object names, instances and units are reproduced as published; descriptions are our own.