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BW437-FCU-LX fan coil unit wall controller (Onyxx LX)

Fan coil unit controller (wall-mount) · BACnet points list

Lynxspring BW437-FCU-LX fan coil unit wall controller (Onyxx LX) BACnet points list

Updated 12 November 2026Unofficial source

Short answer

The BW437-FCU-LX is a wall-mounted fan coil controller with built-in room sensing and three fan speed relays, valve outputs and an auxiliary/reheat output. On BACnet MS/TP it exposes room temperature, humidity and CO2, setpoints by occupancy mode, demands, status flags such as window, filter and service alarms, and configuration multi-states for sequence, fan and input options.

This page lists 87 BACnet objects for the Lynxspring BW437-FCU-LX fan coil unit wall controller (Onyxx LX) — 44 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from a copy of Lynxspring’s documentation hosted by Cochrane Supply, not by Lynxspring itself, so treat it as unofficial.

Manufacturer: Lynxspring
Model: BW437-FCU-LX fan coil unit wall controller (Onyxx LX)
Equipment: Fan coil unit controller (wall-mount)
Equipment type: VAV boxes & fan coils
BACnet objects: 87 (44 writable)
Transport: BACnet MS/TP
Firmware: Not stated
Also known as: BW437-FCU-LX, BW437-FCU, BW437FCU, Onyxx LX BW437 FCU, Onyxx LX fan coil wall controller
Source document: BW437-FCU-LX Wall Controller Quick Guide (unofficial copy, hosted by Cochrane Supply)

Download CSV 87 rows Download EDE B.I.G.-EU JSON Source PDF (unofficial copy) ↗ Compare with your scan Download Easy BACnet Mobile App Google Play

Reference only, provided as-is: verify against Lynxspring’s current documentation and the live device before use. Not official Lynxspring information. Terms of use.

BMS integration notes: Lynxspring BW437-FCU-LX fan coil unit wall controller (Onyxx LX)

Integration in brief

Set the sequence of operation and pipe configuration, then command occupancy (MSV 18), system mode (MSV 16) and fan mode (MSV 17) and adjust the occupied setpoints. Read room temperature, effective occupancy, fan status and the filter/service alarms.

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 16	MODE	System mode (Off/Auto/Cool/Heat)	Write
MV 18	Occ_Cmd	Occupancy command	Write
MV 17	FAN	Fan mode (Lo/Med/Hi/Auto)	Write
AV 40	OccCLSP	Occupied cooling setpoint	Write
AV 39	OccHTSP	Occupied heating setpoint	Write
MV 33	Eff_Occ	Effective occupancy mode	Read
MV 28	FanStat	Fan speed status	Read
AI 5	RoomT	Room temperature	Read
BV 36	Filter	Filter alarm	Read
BV 37	ServALM	Service alarm	Read

Network setup

Network settings are entered in CONFIG MODE on the controller keypad.
BV 1 saves all objects to flash.

Watch out for

BV 14 Aux_Cmd only drives the auxiliary output when MSV 54 is set to Network.
Changeover (2-pipe) needs AI 3 configured as a changeover contact or sensor in MSV 48.

Lynxspring BW437-FCU-LX fan coil unit wall controller (Onyxx LX) 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.

Note: the source document has no read/write column, so access here is inferred from the object type (inputs read-only, values writable). Confirm on the live controller before writing.

87 of 87 shown

Type

Multi-state

Access

Units

Show

Lynxspring BW437-FCU-LX fan coil unit wall controller (Onyxx LX) BACnet Points List
			Description			States
AI	1	AI_1	Analog input 1		Read
AI	2	AI_2	Analog input 2		Read
AI	3	AI_3	Analog input 3		Read
AI	4	AI_4	Remote sensor		Read
AImin	5	RoomT	Room temperature	°F	Read
AI	6	RoomRH	Room humidity	%	Read
AI	7	RoomCO2	Room CO2	ppm	Read
AO	1	AO_ECM	Fan ECM output	%	Read
AO	2	AO_2	Analog output 2	%	Read
AO	3	AO_3	Analog output 3	%	Read
AO	4	AO_4	Auxiliary / Reheat output	%	Read
BI	1	Motion	Motion detection		Read	0=Off, 1=Active
BO	1	BO_1	Binary output 1		Read	0=Off, 1=On
BO	2	BO_2	Binary output 2		Read	0=Off, 1=On
BO	3	BO_3	Binary output 3		Read	0=Off, 1=On
BO	4	BO_4	Binary output 4		Read	0=Off, 1=On
BO	5	BO_High	High speed fan output		Read	0=Off, 1=On
BO	6	BO_Med	Medium speed fan output		Read	0=Off, 1=On
BO	7	BO_Low	Low speed fan output		Read	0=Off, 1=On
AV	1	RoomTSP	Room Temperature setpoint	°F	Write
AV	7	Eff_T	Effective temperature used for control	°F	Read
AV	9	OATemp	Outdoor air temperature	°F	Read
AV	12	SATemp	Supply air temperature	°F	Read
AV	13	CHOV_T	Changeover temperature	°F	Read
AV	21	HTG_Dem	Heating demand	%	Read
AV	22	CLG_Dem	Cooling demand	%	Read
AV	23	Fan_HT__Demand	Fan heating demand	%	Read
AV	24	Fan_CL__Demand	Fan cooling demand	%	Read
AV	25	ECM_Min	ECM minimum speed output	%	Write
AV	30	EffHTSP	Effective heating setpoint	°F	Read
AV	31	EffCLSP	Effective cooling setpoint	°F	Read
AVmin	39	OccHTSP	Occupied heating setpoint	°F	Write
AVmin	40	OccCLSP	Occupied cooling setpoint	°F	Write
AV	41	STBHTSP	Standby heating setpoint	°F	Write
AV	42	STBCLSP	Standby cooling setpoint	°F	Write
AV	43	Unoc_HT_SP	Unoccupied heating setpoint	°F	Write
AV	44	Unoc_CL_SP	Unoccupied cooling setpoint	°F	Write
AV	50	RT_Cal	Room temperature calib		Write
AV	58	MaxHTSP	Maximum heating setpoint	°F	Write
AV	59	MinCLSP	Minimum cooling setpoint	°F	Write
AV	63	SP_DB	Setpoint deadband	°F	Write
AV	67	StandbyDLY_Hrs	Standby time delay	h	Write
AV	68	Unoc_T_DLY_Hrs	Unoccupied time delay	h	Write
BV	1	SaveObj	Save all objects to flash		Write	0=Normal, 1=Save
BV	8	OVRSTAT	Occupancy override status		Read	0=Normal, 1=Overrid
BV	14	Aux_Cmd	Auxiliary network command		Write	0=Off, 1=On
BV	25	AuxStat	Auxiliary output status		Read	0=Off, 1=On
BV	29	AI1Stat	Analog input 1 binary contact status		Read	0=Deactivated, 1=Activated
BV	30	AI2Stat	Analog input 2 binary contact status		Read	0=Deactivated, 1=Activated
BV	31	AI3Stat	Analog input 3 binary contact status		Read	0=Deactivated, 1=Activated
BV	32	Mot_Det	Motion detection		Read	0=None, 1=Moving
BV	35	Window	Window detection status		Read	0=Close, 1=Open
BVmin	36	Filter	Filter sensor status		Read	0=Normal, 1=Alarm
BVmin	37	ServALM	Service alarm status		Read	0=Normal, 1=Alarm
BV	40	Ch_Over	Change over status		Read	0=Cool, 1=Heat
BV	50	AutoMod	Auto mode authorised		Write	0=No, 1=Yes
BV	51	T_Units	Temperature units		Write	0=Imper, 1=Metric
BV	64	Reh_Opt	Reheat control option		Write	0=Pulse1S, 1=On/Off
BV	66	KeepFan	Fan auto mode		Write	0=Fan Low, 1=Fan Off
BV	75	VALVCTL	Valve motors control type		Write	0=On/Off, 1=Floatng
BV	78	AO2_Dir	AO2 action		Write	0=Direct, 1=Reverse
BV	79	AO3_Dir	AO3 action		Write	0=Direct, 1=Reverse
MV	2	Tsource	Temperature input location		Write	1=AutoDet, 2=Intern, 3=Extern
MV	15	SeqOper	Control sequence of operation		Write	1=Cooling, 2=Heating, 3=Cool-Rt, 4=Heat-Rt, 5=Cl-Ht, 6=Cl-Ht-R
MVmin	16	MODE	System mode		Write	1=Off, 2=Auto, 3=Cool, 4=Heat
MVmin	17	FAN	Fan mode		Write	1=Lo, 2=Med, 3=Hi, 4=Auto
MVmin	18	Occ_Cmd	Occupancy command		Write	1=Loc_Occ, 2=Occupied, 3=Unoccup
MV	19	KeyLock	Keypad lock level		Write	1=None, 2=Fan, 3=Mode, 4=FanMode, 5=All
MV	26	BO3_BO4	BO3/BO4 status		Read	1=Stopped, 2=Open, 3=Close
MV	27	BO1_BO2	BO1/BO2 status		Read	1=Stopped, 2=Open, 3=Close
MVmin	28	FanStat	Fan status		Read	1=Off, 2=Low, 3=Med, 4=High
MVmin	33	Eff_Occ	Effective occupancy mode		Read	1=Occupied, 2=Unoccup, 3=TempOcc, 4=Standby
MV	46	AI1_CFG	Analog input 1 configuration		Write	1=None, 2=Rem NSB, 3=Mot-NO, 4=Mot-NC, 5=Window
MV	47	AI2_CFG	Analog input 2 configuration		Write	1=None, 2=Door Dry (door switch), 3=Overrid (remote local override switch), 4=Filter, 5=Service
MV	48	AI3_CFG	Analog input 3 configuration		Write	1=None, 2=COC/NH (normally heat changeover contact), 3=COC/NH (normally cool changeover contact), 4=COS (changeover sensor), 5=SS (remote monitoring 10K sensor)
MV	52	PipeNum	Pipe number		Write	1=2 Pipes, 2=4 Pipes
MV	54	Aux_CFG	Auxiliary output configuration		Write	1=Reheat, 2=Occ-NO, 3=Occ-NC, 4=Fan-NO, 5=Fan-NC, 6=Network
MV	55	Reheat	Reheat type		Write	1=Basebrd, 2=Coil
MV	58	Fan_Seq	Control fan sequence		Write	1=L-M-H, 2=L-H, 3=L-M-H-A, 4=L-M-H, 5=On-Auto
MV	61	Occ_Opt	Occupancy options schedule or motion		Write	1=No, 2=S_and_M, 3=S_or_M, 4=Sc-Only
MV	62	OvrTime	Override time delay		Write	Range 0-24 hours
MV	65	PB	Heating / cooling proportional band		Write	Range 3 F (1.2 C) - 10 F (5.6 C)
MV	70	SP_AUTO	Zone Temperature setpoint in auto mode		Write	1=Heating, 2=Center, 3=Cooling
MV	75	BO3Time	BO3/BO4 travel time for 3 states valve		Write	Range 0.5-6 min
MV	76	BO1Time	BO1/BO2 travel time for 3 states valve		Write	Range 0.5-6 min
MV	77	CL_CPH	Cooling output cycle per hour		Write	Range 3-8 CPH
MV	78	HT_CPH	Heating output cycle per hour		Write	Range 3-8 CPH

Object ID lookup: Lynxspring BW437-FCU-LX fan coil unit wall controller point IDs by name

AI1AI_1
AI2AI_2
AI3AI_3
AI4AI_4
AI5RoomT
AI6RoomRH
AI7RoomCO2
AO1AO_ECM
AO2AO_2
AO3AO_3
AO4AO_4
BI1Motion
BO1BO_1
BO2BO_2
BO3BO_3
BO4BO_4
BO5BO_High
BO6BO_Med
BO7BO_Low
AV1RoomTSP
AV7Eff_T
AV9OATemp
AV12SATemp
AV13CHOV_T
AV21HTG_Dem
AV22CLG_Dem
AV23Fan_HT__Demand
AV24Fan_CL__Demand
AV25ECM_Min
AV30EffHTSP
AV31EffCLSP
AV39OccHTSP
AV40OccCLSP
AV41STBHTSP
AV42STBCLSP
AV43Unoc_HT_SP
AV44Unoc_CL_SP
AV50RT_Cal
AV58MaxHTSP
AV59MinCLSP
AV63SP_DB
AV67StandbyDLY_Hrs
AV68Unoc_T_DLY_Hrs
BV1SaveObj
BV8OVRSTAT
BV14Aux_Cmd
BV25AuxStat
BV29AI1Stat
BV30AI2Stat
BV31AI3Stat
BV32Mot_Det
BV35Window
BV36Filter
BV37ServALM
BV40Ch_Over
BV50AutoMod
BV51T_Units
BV64Reh_Opt
BV66KeepFan
BV75VALVCTL
BV78AO2_Dir
BV79AO3_Dir
MV2Tsource
MV15SeqOper
MV16MODE
MV17FAN
MV18Occ_Cmd
MV19KeyLock
MV26BO3_BO4
MV27BO1_BO2
MV28FanStat
MV33Eff_Occ
MV46AI1_CFG
MV47AI2_CFG
MV48AI3_CFG
MV52PipeNum
MV54Aux_CFG
MV55Reheat
MV58Fan_Seq
MV61Occ_Opt
MV62OvrTime
MV65PB
MV70SP_AUTO
MV75BO3Time
MV76BO1Time
MV77CL_CPH
MV78HT_CPH

Integration notes

The guide has no read/write column; access is inferred from its tags (Status = read-only; Cfg, User and Cmd = writable).
MSV 62, 65 and 75-78 print a value range in the state text column instead of a state list; the range is given here.
MSV 58 prints L-M-H twice in its state list; kept as printed.
Temperature units are listed as °F; the guide prints °F and °C ranges and the controller can be set to metric.

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 BW437-FCU-LX fan coil unit wall controller (Onyxx LX) 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 Lynxspring BW437-FCU-LX fan coil unit wall controller (Onyxx LX)

How many BACnet points does the Lynxspring BW437-FCU-LX fan coil unit wall controller (Onyxx LX) have?

This list has 87 BACnet objects: 7 analog inputs, 4 analog outputs, 24 analog values, 1 binary input, 7 binary outputs, 19 binary values, 25 multi-state values. The exact set on a given unit depends on its firmware, installed options and configuration.

Which Lynxspring BW437-FCU-LX fan coil unit wall controller (Onyxx LX) BACnet points are writable?

44 of the 87 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. The source has no read/write column, so this is inferred from object type.

Where is the official Lynxspring BW437-FCU-LX fan coil unit wall controller (Onyxx LX) BACnet documentation?

Lynxspring does not publish it on its own website. This list comes from BW437-FCU-LX Wall Controller Quick Guide, a copy hosted by Cochrane Supply at https://www.cochranesupply.com/media/assets/product/documents/Lynxspring/BW437-FCU-quick-guide.pdf. Ask Lynxspring or its representative for the current revision.

What are the minimum BACnet points to integrate the Lynxspring BW437-FCU-LX fan coil unit wall controller (Onyxx LX)?

Start with MV 16 MODE (System mode (Off/Auto/Cool/Heat)); MV 18 Occ_Cmd (Occupancy command); MV 17 FAN (Fan mode (Lo/Med/Hi/Auto)); AV 40 OccCLSP (Occupied cooling setpoint); AV 39 OccHTSP (Occupied heating setpoint); MV 33 Eff_Occ (Effective occupancy mode); MV 28 FanStat (Fan speed status); AI 5 RoomT (Room temperature); BV 36 Filter (Filter alarm); BV 37 ServALM (Service alarm).

How do I check these points on the real BW437-FCU-LX fan coil unit wall controller (Onyxx LX)?

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 Lynxspring BACnet points lists

Source: BW437-FCU-LX Wall Controller Quick Guide. Object names, instances and units are reproduced as published; descriptions are our own.