Home
BACnet points lists
RBI
FIII / Fusion / CK boilers with HeatNet V3 control

Commercial boiler controller · BACnet points list

RBI FIII / Fusion / CK boilers with HeatNet V3 control BACnet points list

Updated 28 October 2026

Short answer

The HeatNet V3 control on RBI FIII, Fusion and CK boilers exposes a fixed BACnet object list. The BMS writes heat demand, the system setpoint (guarded by a countdown failsafe timer), outdoor-reset settings, DHW setpoint, clock and flow/boiler limits as analog and binary values. Read-only analog inputs give plant temperatures, counts and per-boiler run time, cycles, temperatures and modulation, and read-only binary values give interlock, alarm and status flags for each of up to 16 boilers.

This page lists 99 BACnet objects for the RBI FIII / Fusion / CK boilers with HeatNet V3 control — 20 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from RBI’s own free documentation, linked below.

Manufacturer: RBI
Model: FIII / Fusion / CK boilers with HeatNet V3 control
Equipment: Commercial boiler controller
Equipment type: Boilers & water heaters
BACnet objects: 99 (20 writable)
Transport: —
Firmware: HeatNet V3; BTUH, system return/flow and boiler-count points need firmware 2.00 or later
Also known as: HeatNet V3, HeatNet, Futera III, FIII, Futera Fusion, Fusion, CK Series, Mestek, RBI V3 BACnet Objects
Source document: RBI FIII/Fusion/CK Series Boiler - HeatNet V3 BACnet Objects · V1.00

Download CSV 99 rows Download EDE B.I.G.-EU JSON Manufacturer PDF ↗ Download Easy BACnet Mobile App Google Play

BMS integration notes: RBI FIII / Fusion / CK boilers with HeatNet V3 control

Integration in brief

Connect the BMS to the master (boiler 1) HeatNet board. Write BV 1 HeatDemand to call for heat and AV 2 Setpoint for the system setpoint, and keep reloading AV 1 SetpointTimer so the plant does not fall back to its local setpoint. Read header/supply/return temperatures, boilers on, modulation and the per-boiler alarm and failed flags.

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
BV 1	HeatDemand	Heat demand from the BMS (1 = heat)	Write
AV 2	Setpoint	System setpoint, 40-220 °F	Write
AV 1	SetpointTimer	Failsafe countdown; reload before it reaches 0	Write
AI 144	OperatingSetpoint	Active setpoint in use	Read
AI 3	HeaderTemp	Header / system temperature, °F	Read
AI 1	BoilersOn	Number of boilers running	Read
AI 2	Modulation	System target modulation, %	Read
BV 1005	Boiler##_Running	Boiler 1 firing (add 32 per boiler number)	Read
BV 1002	Boiler##_Alarm	Boiler 1 alarm (add 32 per boiler number)	Read
BV 1003	Boiler##_Failed	Boiler 1 failed (add 32 per boiler number)	Read

Enable & remote start

BV 1 HeatDemand puts the boiler (plant) into heating mode when set to 1; 0 removes the demand. The setpoint the BMS writes is AV 2 Setpoint.

Heartbeat & communication loss

AV 1 SetpointTimer (0-65535 s) is a BMS failsafe countdown. The BMS must reload it periodically; if it reaches zero the control assumes the BMS has stopped and reloads its own saved local setpoint. Writing any read/write variable reloads the timer to 60 s if it is below 60 (on firmware below 3.48 only writing the setpoint does this).

Sensors & values from the BMS

AV 16 BMSFlowRateGPM lets the BMS supply the system flow for flow-limited control, and AV 17 BMSLimitBoilers caps how many boilers HeatNet may run. AV 3-7 and BV 2 set up outdoor air reset; there is no writable outdoor temperature.

Network setup

The object document gives no data link, address or device-instance settings.
To set the clock, write AV 8-14 (month, day, year, hour, minute, second, weekday) and then write 1 to BV 3 SetClock.

Watch out for

If SetpointTimer runs out, the plant quietly returns to its local setpoint.
Per-boiler objects are listed at the boiler 1 instance; offset them by boiler number using the formulas in the notes. Boiler 1 is the master or stand-alone boiler.
Modulation per boiler (AI 128-143) does not work in AA/High Fire, T1 or T2 modes.
Several points need firmware 2.00 or later.

RBI FIII / Fusion / CK boilers with HeatNet V3 control 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.

99 of 99 shown

Type

Binary

Access

Units

Show

RBI FIII / Fusion / CK boilers with HeatNet V3 control BACnet Points List
			Description			States
AVmin	1	SetpointTimer	BMS failsafe timer; reload before it counts to zero; 0 – 65535 seconds	s	Write
AVmin	2	Setpoint	System setpoint written by the BMS (see SetpointTimer); 40 - 220 °F (4.5 – 104.4 °C)	°F	Write
AV	3	OARSetpoint	Outdoor temperature at which the boiler shuts down; 40 – 100 °F (4.5 – 37.8 °C)	°F	Write
AV	4	OARHighWaterTemp	Water setpoint at the high outdoor temperature; 60 – 190 °F (15.6 – 87.8 °C)	°F	Write
AV	5	OARHighAirTemp	High outdoor air temperature reset point; 50 – 90 °F (10 – 32.2 °C)	°F	Write
AV	6	OARLowWaterTemp	Header/supply setpoint at the low outdoor temperature; 70 – 220 °F (21.1 – 104.4 °C)	°F	Write
AV	7	OARLowAirTemp	Low outdoor air temperature reset point; -35 – 40 °F (-37.2 – 4.4 °C)	°F	Write
AV	8	SetMonth	Clock set value: month (0 = January); 0 (January) – 11 (December)	months	Write
AV	9	SetDay	Clock set value: day; 1 – 31	days	Write
AV	10	SetYear	Clock set value: year (0-99); 0 – 99	years	Write
AV	11	SetHour	Clock set value: hour; 0 – 23	h	Write
AV	12	SetMinute	Clock set value: minute; 0 – 59	min	Write
AV	13	SetSecond	Clock set value: second; 0 – 59	s	Write
AV	14	SetWeekday	Clock set value: weekday (0 = Monday); 0 (Monday) – 6 (Sunday)		Write
AV	15	DHWSetpoint	DHW setpoint; 40 – 200 °F (4.4 – 93.3 °C)	°F	Write
AV	16	BMSFlowRateGPM	System flow measured by the BMS (flow-limited control); 0 – 1500	gpm	Write
AV	17	BMSLimitBoilers	Number of boilers HeatNet may run (boilers-limited control); 0 – 16		Write
BVmin	1	HeatDemand	BMS heat demand: 1 puts the boiler plant into heating		Write	0=No heat demand, 1=Heat demand
BV	2	OAResetEnable	Enable outdoor air reset		Write	0=Disabled, 1=Enabled
BV	3	SetClock	Write 1 to load the Set... values into the clock		Write	1=Set the clock
BV	1000	Boiler##_Disabled	Disabled		Read	0=enabled, 1=disabled
BV	1001	Boiler##_LocalOverride	Local Override (member boilers only)		Read	0=no override, 1=override
BVmin	1002	Boiler##_Alarm	Alarm		Read	0=ok, 1=alarm
BVmin	1003	Boiler##_Failed	Failed		Read	0=ok, 1=failed
BV	1004	Boiler##_MemberError	Member Alarm or Failed		Read	0=ok, 1=error
BVmin	1005	Boiler##_Running	Running/firing		Read	0=off, 1=running (firing)
BV	1006	Boiler##_LocalPumpOn	Local pump is on/running		Read	0=off, 1=on (running)
BV	1007	Boiler##_SystemFlowInterlock	System Flow Interlock		Read	0=open, 1=closed
BV	1008	Boiler##_LwcoInterlock	Low Water Cutoff Interlock		Read	0=open, 1=closed
BV	1009	Boiler##_VfdInterlock	VFD Interlock		Read	0=open, 1=closed
BV	1010	Boiler##_GasProveInterlock	Gas Prove Interlock		Read	0=open, 1=closed
BV	1011	Boiler##_Spare4Interlock	Spare 4 (application defined) Interlock		Read	0=open, 1=closed
BV	1012	Boiler##_OperatorInterlock	Operator Interlock		Read	0=open, 1=closed
BV	1013	Boiler##_LocalFlowInterlock	Local Flow Interlock		Read	0=open, 1=closed
BV	1015	Boiler##_MainValve	Main Valve		Read	0=closed, 1=open
BV	1016	Boiler##_PilotValve	Pilot Valve		Read	0=closed, 1=open
BV	1017	Boiler##_BlowerOn	Blower is on/running		Read	0=off, 1=on (running)
BV	1018	Boiler##_IgnitionAlarm	Ignition Circuit Alarm		Read	0=ok, 1=alarm
BV	1019	Boiler##_IRIAlarm	IRI Alarm		Read	0=ok, 1=alarm
BV	1020	Boiler##_HighLimit	High Limit		Read	0=ok, 1=tripped
BV	1021	Boiler##_AirProveSwitch	Air Prove Switch		Read	0=proven, 1=not proven
BV	1023	Boiler##_SoftwareOperator	Software Operator Tripped		Read	0=not tripped, 1=tripped
BV	1024	Boiler##_HeaderSensorNA	Header Sensor not available (detected)		Read	0=detected, 1=not available
BV	1025	Boiler##_SupplySensorNA	Supply/Outlet Sensor not available (detected)		Read	0=detected, 1=not available
BV	1026	Boiler##_ReturnSensorNA	Return/Inlet Sensor not available (detected)		Read	0=detected, 1=not available
BV	1027	Boiler##_OutsideSensorNA	Outside sensor not available (manual text says Header)		Read	0=detected, 1=not available
BV	1028	Boiler##_SystemPumpOn	System Pump is on/running		Read	0=off, 1=on (running)
BV	1029	Boiler##_DamperProve1	Combustion Air Damper Prove (J10B). (revision 1.x controls only)		Read	0=not proven, 1=proven
BV	1030	Boiler##_Master	This is the Master Boiler		Read	0=member, 1=master
BV	1031	Boiler##_Detected	Detected (present)		Read	0=not detected, 1=detected
BV	2000	Boiler##_AAHighFire	AA/High Fire Input		Read	0=open, 1=closed
BV	2001	Boiler##_HeatDemand	Heat Demand (Local Override) Input		Read	0=open, 1=closed
BV	2002	Boiler##_4to20Remote	4 to 20ma Remote Input		Read	0=open, 1=closed
BV	2003	Boiler##_OAROverride	Outside Air Reset Override Input		Read	0=open, 1=closed
BV	2004	Boiler##_T1	T1 Input		Read	0=open, 1=closed
BV	2005	Boiler##_T2	T2 Input		Read	0=open, 1=closed
BV	2006	Boiler##_T3	T3 Input		Read	0=open, 1=closed
BV	2007	Boiler##_T4	T4 Input		Read	0=open, 1=closed
BV	3000	Boiler##_DHWEnabled	DHW enabled status (menus)		Read	0=disabled, 1=enabled
BV	3001	Boiler##_DamperProve2	Damper Prove (J12B)		Read	0=open, 1=closed (proven)
BV	3002	Boiler##_ServiceFault	Call service fault		Read	0=ok, 1=fault
BV	3003	Boiler##_BlowerFault	Air Switch Blower fault		Read	0=ok, 1=fault
BV	3009	Boiler##_DHWSensorNA	DHW Sensor is not available (detected)		Read	0=detected, 1=not available
BV	3010	Boiler##_DHWBoiler	DHW Boiler		Read	0=no, 1=yes
BV	3011	Boiler##_OpLimitClamp	Input limited (clamped) by high supply temperature		Read	0=not clamped, 1=clamped
BV	3012	Boiler01_BoilersFlowLimited	Boilers limited by the BMS flow rate value		Read	0=not limited, 1=limited
BV	3013	Boiler01_BoilersBMSLimited	Boilers limited by the BMS limit-boilers value		Read	0=not limited, 1=limited
BV	3014	Boiler##_StackSensorNA	Stack Sensor is not available (detected) (firmware 2.00+)		Read	0=detected, 1=not available
BV	3015	Boiler##_SysReturnSensorNA	System Return Sensor is not available (detected) (firmware 2.00+)		Read	0=detected, 1=not available
AImin	1	BoilersOn	Boilers currently running		Read
AImin	2	Modulation	System target modulation level	%	Read
AImin	3	HeaderTemp	Header / system temperature	°F	Read
AI	4	SupplyTemp	Supply temperature	°F	Read
AI	5	ReturnTemp	Return temperature	°F	Read
AI	6	OutsideTemp	Outside air temperature	°F	Read
AI	7	Spare1	Raw A/D value, spare input 1		Read
AI	8	Spare2	Raw A/D value, spare input 2		Read
AI	9	Month	Clock month (0 = January)	months	Read
AI	10	Day	Clock day	days	Read
AI	11	Year	Clock year (0-99)	years	Read
AI	12	Hour	Clock hour	h	Read
AI	13	Minute	Clock minute	min	Read
AI	14	Second	Clock second	s	Read
AI	15	Weekday	Clock weekday (0 = Monday)		Read
AI	16	DHWTemp	DHW temperature	°F	Read
AI	48	Boiler01_Runtime	Boiler 1 run time with the current control board	min	Read
AI	64	Boiler01_Cycles	Boiler 1 cycles with the current control board		Read
AI	80	Boiler01_SupplyTemp	Boiler 1 supply (outlet) temperature	°F	Read
AI	96	Boiler01_ReturnTemp	Boiler 1 return (inlet) temperature	°F	Read
AI	112	Boiler01_DHWTemp	Boiler 1 DHW sensor temperature	°F	Read
AI	128	Boiler01_Modulation	Boiler 1 modulation (not in AA/High Fire, T1 or T2 modes)	%	Read
AImin	144	OperatingSetpoint	Active setpoint: normal, DHW, outdoor reset or 4-20 mA	°F	Read
AI	145	AvailableBoilers	Boilers available		Read
AI	146	BTUH	Estimated plant output (firmware 2.00+)	BTU/h	Read
AI	147	SystemReturnTemp	System return temperature, if fitted (firmware 2.00+)	°F	Read
AI	148	SystemFlow	System flow: meter reading or BMSFlowRateGPM (firmware 2.00+)	gpm	Read
AI	149	HeatingBoilersOn	Boilers running for heating (firmware 2.00+)		Read
AI	150	DHWBoilersOn	Boilers running for DHW (firmware 2.00+)		Read
AI	151	ManualBoilersOn	Boilers running on local override, T1, T2, AA (firmware 2.00+)		Read

Integration notes

The object list does not say which BACnet data link (BACnet IP or BACnet MS/TP) is used and gives no device instance or network settings.
Per-boiler binary values are printed once as Boiler##_<name> with an instance formula; they are listed here at the boiler 1 instance. Boiler n = 1000-series base + (n - 1) x 32, or 2000/3000-series base + (n - 1) x 16. Boiler 1 is the master or stand-alone (BACnet-connected) boiler; members are 2-16.
Per-boiler analog inputs are printed as ranges and listed here for boiler 1 only: Boiler01-16_Runtime AI 48-63, _Cycles AI 64-79, _SupplyTemp AI 80-95, _ReturnTemp AI 96-111, _DHWTemp AI 112-127, _Modulation AI 128-143 (boiler n = boiler 1 instance + n - 1).
No objects are printed at BV 1014, BV 1022 or BV 3004-3008.
The manual describes Boiler##_OutsideSensorNA as 'Header Sensor not available', the same text as HeaderSensorNA; the name suggests the outside sensor.
Temperatures are in °F.

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 FIII / Fusion / CK boilers with HeatNet V3 control 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 RBI FIII / Fusion / CK boilers with HeatNet V3 control

How many BACnet points does the RBI FIII / Fusion / CK boilers with HeatNet V3 control have?

This list has 99 BACnet objects: 30 analog inputs, 17 analog values, 52 binary values. The exact set on a given unit depends on its firmware, installed options and configuration.

Which RBI FIII / Fusion / CK boilers with HeatNet V3 control BACnet points are writable?

20 of the 99 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 RBI FIII / Fusion / CK boilers with HeatNet V3 control BACnet documentation?

The source is RBI FIII/Fusion/CK Series Boiler - HeatNet V3 BACnet Objects (V1.00), published free by RBI at https://www.literature.mestek.com/dms/RBI%20Water%20Heaters/RBI%20V3%20BACnet%20Objects%20v1.00.pdf.

What are the minimum BACnet points to integrate the RBI FIII / Fusion / CK boilers with HeatNet V3 control?

Start with BV 1 HeatDemand (Heat demand from the BMS (1 = heat)); AV 2 Setpoint (System setpoint, 40-220 °F); AV 1 SetpointTimer (Failsafe countdown; reload before it reaches 0); AI 144 OperatingSetpoint (Active setpoint in use); AI 3 HeaderTemp (Header / system temperature, °F); AI 1 BoilersOn (Number of boilers running); AI 2 Modulation (System target modulation, %); BV 1005 Boiler##_Running (Boiler 1 firing (add 32 per boiler number)); BV 1002 Boiler##_Alarm (Boiler 1 alarm (add 32 per boiler number)); BV 1003 Boiler##_Failed (Boiler 1 failed (add 32 per boiler number)).

How do I enable BMS control of the RBI FIII / Fusion / CK boilers with HeatNet V3 control?

BV 1 HeatDemand puts the boiler (plant) into heating mode when set to 1; 0 removes the demand. The setpoint the BMS writes is AV 2 Setpoint.

Does the RBI FIII / Fusion / CK boilers with HeatNet V3 control need a BACnet heartbeat or have a communication timeout?

Can the BMS supply sensor values to the RBI FIII / Fusion / CK boilers with HeatNet V3 control?

How do I check these points on the real FIII / Fusion / CK boilers with HeatNet V3 control?

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.

Source: RBI FIII/Fusion/CK Series Boiler - HeatNet V3 BACnet Objects · V1.00. Object names, instances and units are reproduced as published; descriptions are our own.