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tekmar Boiler Control 284

Multi-boiler plant controller (boiler staging) · BACnet points list

Watts tekmar Boiler Control 284 BACnet points list

Updated 4 November 2026

Short answer

The tekmar 284 boiler staging control has BACnet IP built in on an RJ45 port (it can be switched to Modbus over RS-485 instead). In BAS application mode the BMS sends the target temperature, a setpoint call and pump requests; in the other modes the BMS can monitor and adjust a few settings. Per-boiler objects repeat for boilers 1-4.

This page lists 72 BACnet objects for the Watts tekmar Boiler Control 284 — 13 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from Watts’s own free documentation, linked below.

Manufacturer: Watts
Model: tekmar Boiler Control 284
Equipment: Multi-boiler plant controller (boiler staging)
Equipment type: Boilers & water heaters
BACnet objects: 72 (13 writable)
Transport: BACnet IP
Firmware: Application software J1220x (per the PICS)
Default device instance: 0
Also known as: tekmar 284, Boiler Control 284, 284, tekmar multi-staging 284
Source document: Boiler Control 284 BAS Integration Manual · 284_B · rev. 08/14

Download CSV 72 rows Download EDE B.I.G.-EU JSON Manufacturer PDF ↗ Compare with your scan Download Easy BACnet Mobile App Google Play

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

BMS integration notes: Watts tekmar Boiler Control 284

Integration in brief

Set the 284 BAS Type to BACnet IP and give it a device ID and IP settings in the BAS menu. For full control put the 284 in BAS application mode, then write AV 0 setpoint and BV 0 setpoint call, plus BV 1 / BO 0 pump requests. In the other application modes, turn BAS Monitor on to read values and adjust the room and outdoor design settings.

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 0	BAS SETP CALL	Setpoint call from the BMS (1 = call for heat)	Write
BV 1	BAS PRIM PMP REQ	Primary pump request (1 = on)	Write
AV 0	SETPOINT	Target supply temperature, 60-225 °F	Write
BI 6	HEAT CALL	Heat call active	Read
AI 0	Boil TARG	Target temperature in use, °F	Read
AI 3	Boil SUP	Boiler plant supply temperature, °F	Read
AI 4	Boil RET	Boiler plant return temperature, °F	Read
AI 15	ERROR	Error code; 0 = no error	Read

Enable & remote start

BMS control needs Application Mode = BAS on the 284; then AV 0 sets the target temperature and BV 0 makes the setpoint call, BV 1 requests the primary pump(s) and BO 0 the DHW pump. In RSET, SETP, DDHW or EMS mode the BMS gets monitoring and setting adjustment only, and BAS Monitor must be set ON (Advanced access).

Sensors & values from the BMS

AV 5 takes an outdoor air temperature from the BAS; write -85 °F to mean no BAS sensor.

Network setup

BAS Type = BACn selects BACnet IP over the RJ45 port; MODB switches to Modbus over RS-485.
Device ID is entered as four number groups (0-4, 0-99, 0-99, 0-99); default 0,0,0,0.
DHCP is ON by default; with DHCP off the default IP is 192.168.0.200, gateway 192.168.0.1, subnet 255.255.255.0.
UDP port default 0xBAC0 (47808); BBMD foreign registration is set with BBMD TIME, IP and port.
The BAS menu items need Advanced access, which requires the lock/unlock switch beside the display set to unlock.
DeviceCommunicationControl password is tekmar.

Watch out for

ENABLE B1-B4 (BV 2-5) are 0 = enable, 1 = disable.
The PICS lists no segmentation support.
Ethernet cable runs are limited to 150 ft for CAT-5E or 300 ft for CAT-6.

Watts tekmar Boiler Control 284 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.

72 of 72 shown

Type

Access

Units

Show

Watts tekmar Boiler Control 284 BACnet Points List
			Description			States
AImin	0	Boil TARG	Boiler target temperature	°F	Read
AI	1	Boil MIN	Minimum boiler target temperature	°F	Read
AI	2	Boil MAX	Maximum boiler target temperature	°F	Read
AImin	3	Boil SUP	Boiler supply temperature	°F	Read
AImin	4	Boil RET	Boiler return temperature	°F	Read
AI	5	OUTDOOR	Outdoor air temperature	°F	Read
AI	6	DHW	DHW tank temperature	°F	Read
AI	7	VENT	Vent temperature	°F	Read
AI	8	Boil INLET	Boiler inlet temperature	°F	Read
AI	9	FLOW RATE	Flow rate	GPM	Read
AI	10	ENERGY	Energy usage	therms	Read
AI	11	PRESSURE	System pressure	psi	Read
AI	12	PRIM P1 RT	Primary pump 1 running time	h	Read
AI	13	PRIM P2 RT	Primary pump 2 running time	h	Read
AI	14	DHW P RT	DHW pump running time	h	Read
AImin	15	ERROR	Current error code (see error list)		Read
AI	16	Boil 1 TYPE	Boiler 1 type		Read	0=MOD, 1=1STG, 2=2STG, 3=EMS
AI	17	Boil 1 OUT	Boiler 1 outlet temperature	°F	Read
AI	18	Boil 1 MOD	Boiler 1 modulating output	%	Read
AI	19	BURNER 1	Boiler 1 running time	h	Read
AI	20	CYCLES 1	Boiler 1 cycles		Read
AI	21	PUMP 1 RT	Boiler 1 pump running time	h	Read
AI	22	Boil 2 TYPE	Boiler 2 type		Read	0=MOD, 1=1STG, 2=2STG, 3=EMS
AI	23	Boil 2 OUT	Boiler 2 outlet temperature	°F	Read
AI	24	Boil 2 MOD	Boiler 2 modulating output	%	Read
AI	25	BURNER 2	Boiler 2 running time	h	Read
AI	26	CYCLES 2	Boiler 2 cycles		Read
AI	27	PUMP 2 RT	Boiler 2 pump running time	h	Read
AI	28	Boil 3 TYPE	Boiler 3 type		Read	0=MOD, 1=1STG, 2=2STG, 3=EMS
AI	29	Boil 3 OUT	Boiler 3 outlet temperature	°F	Read
AI	30	Boil 3 MOD	Boiler 3 modulating output	%	Read
AI	31	BURNER 3	Boiler 3 running time	h	Read
AI	32	CYCLES 3	Boiler 3 cycles		Read
AI	33	PUMP 3 RT	Boiler 3 pump running time	h	Read
AI	34	Boil 4 TYPE	Boiler 4 type		Read	0=MOD, 1=1STG, 2=2STG, 3=EMS
AI	35	Boil 4 OUT	Boiler 4 outlet temperature	°F	Read
AI	36	Boil 4 MOD	Boiler 4 modulating output	%	Read
AI	37	BURNER 4	Boiler 4 running time	h	Read
AI	38	CYCLES 4	Boiler 4 cycles		Read
AI	39	PUMP 4 RT	Boiler 4 pump running time	h	Read
AVmin	0	SETPOINT	BAS setpoint temperature, 60-225 °F	°F	Write
AV	1	ROOM Occ	Room occupied temperature	°F	Write
AV	2	ROOM UnOcc	Room unoccupied temperature	°F	Write
AV	3	OUT DSGN	Outdoor design temperature	°F	Write
AV	4	TERMINAL	Terminal unit type		Write	0=HRF1, 1=HRF2, 2=CONV, 3=COIL, 4=RAD, 5=BASE
AV	5	OUTDOOR	Outdoor air temperature from the BAS (-85 = no BAS sensor)	°F	Write
BI	0	PRIM P1	Primary pump 1 status		Read	0=Off, 1=On
BI	1	PRIM P2	Primary pump 2 status		Read	0=Off, 1=On
BI	2	DHW PUMP	DHW pump status		Read	0=Off, 1=On
BI	3	SETBACK	Setback status		Read	0=Off, 1=On
BI	4	AUX RLY	Auxiliary relay status		Read	0=Off, 1=On
BI	5	ALERT RLY	Alert relay status		Read	0=Off, 1=On
BImin	6	HEAT CALL	Heat call status		Read	0=Off, 1=On
BI	7	DHW CALL	DHW call status		Read	0=Off, 1=On
BI	8	SETP CALL	Setpoint call status		Read	0=Off, 1=On
BI	9	FLOW PROOF	Flow proof call status		Read	0=Off, 1=On
BI	10	CA PROOF	Combustion air proof call status		Read	0=Off, 1=On
BI	11	CONDENSE 1	Boiler 1 condensing		Read	0=No, 1=Yes
BI	12	B1 PUMP	Boiler 1 pump status		Read	0=Off, 1=On
BI	13	CONDENSE 2	Boiler 2 condensing		Read	0=No, 1=Yes
BI	14	B2 PUMP	Boiler 2 pump status		Read	0=Off, 1=On
BI	15	CONDENSE 3	Boiler 3 condensing		Read	0=No, 1=Yes
BI	16	B3 PUMP	Boiler 3 pump status		Read	0=Off, 1=On
BI	17	CONDENSE 4	Boiler 4 condensing		Read	0=No, 1=Yes
BI	18	B4 PUMP	Boiler 4 pump status		Read	0=Off, 1=On
BO	0	DHW PUMP	DHW pump request from the BAS		Write	0=Off, 1=On
BVmin	0	BAS SETP CALL	Setpoint call from the BAS		Write	0=Off, 1=On
BVmin	1	BAS PRIM PMP REQ	Primary pump request from the BAS		Write	0=Off, 1=On
BV	2	ENABLE B1	Enable / disable boiler 1		Write	0=Enable, 1=Disable
BV	3	ENABLE B2	Enable / disable boiler 2		Write	0=Enable, 1=Disable
BV	4	ENABLE B3	Enable / disable boiler 3		Write	0=Enable, 1=Disable
BV	5	ENABLE B4	Enable / disable boiler 4		Write	0=Enable, 1=Disable

Object ID lookup: Watts tekmar Boiler Control 284 point IDs by name

AI0Boil TARG
AI1Boil MIN
AI2Boil MAX
AI3Boil SUP
AI4Boil RET
AI5OUTDOOR
AI6DHW
AI7VENT
AI8Boil INLET
AI9FLOW RATE
AI10ENERGY
AI11PRESSURE
AI12PRIM P1 RT
AI13PRIM P2 RT
AI14DHW P RT
AI15ERROR
AI16Boil 1 TYPE
AI17Boil 1 OUT
AI18Boil 1 MOD
AI19BURNER 1
AI20CYCLES 1
AI21PUMP 1 RT
AI22Boil 2 TYPE
AI23Boil 2 OUT
AI24Boil 2 MOD
AI25BURNER 2
AI26CYCLES 2
AI27PUMP 2 RT
AI28Boil 3 TYPE
AI29Boil 3 OUT
AI30Boil 3 MOD
AI31BURNER 3
AI32CYCLES 3
AI33PUMP 3 RT
AI34Boil 4 TYPE
AI35Boil 4 OUT
AI36Boil 4 MOD
AI37BURNER 4
AI38CYCLES 4
AI39PUMP 4 RT
AV0SETPOINT
AV1ROOM Occ
AV2ROOM UnOcc
AV3OUT DSGN
AV4TERMINAL
AV5OUTDOOR
BI0PRIM P1
BI1PRIM P2
BI2DHW PUMP
BI3SETBACK
BI4AUX RLY
BI5ALERT RLY
BI6HEAT CALL
BI7DHW CALL
BI8SETP CALL
BI9FLOW PROOF
BI10CA PROOF
BI11CONDENSE 1
BI12B1 PUMP
BI13CONDENSE 2
BI14B2 PUMP
BI15CONDENSE 3
BI16B3 PUMP
BI17CONDENSE 4
BI18B4 PUMP
BO0DHW PUMP
BV0BAS SETP CALL
BV1BAS PRIM PMP REQ
BV2ENABLE B1
BV3ENABLE B2
BV4ENABLE B3
BV5ENABLE B4

Integration notes

The manual prints the per-boiler objects once with an (n) placeholder (e.g. "Boil (n) TYPE", "B(n) PUMP", "ENABLE B(n)") and lists the instance for each of boilers 1-4; names here are written with (n) replaced by the boiler number.
AI 15 ERROR returns a numeric code; the manual lists 0 = no error and codes for EEPROM, sensor, flow/combustion-air proof and tN4 bus faults.
BV 2-5 use inverted logic: 0 = enable, 1 = disable.
AV 5 accepts -85 °F to mean no BAS outdoor 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. 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 tekmar Boiler Control 284 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 Watts tekmar Boiler Control 284

How many BACnet points does the Watts tekmar Boiler Control 284 have?

This list has 72 BACnet objects: 40 analog inputs, 6 analog values, 19 binary inputs, 1 binary output, 6 binary values. The exact set on a given unit depends on its firmware, installed options and configuration.

Which Watts tekmar Boiler Control 284 BACnet points are writable?

13 of the 72 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 Watts tekmar Boiler Control 284 BACnet documentation?

The source is Boiler Control 284 BAS Integration Manual (284_B), revision 08/14, published free by Watts at https://www.watts.com/dfsmedia/0533dbba17714b1ab581ab07a4cbb521/42772-source/638820695650000000/284-b-04.pdf.

What are the minimum BACnet points to integrate the Watts tekmar Boiler Control 284?

Start with BV 0 BAS SETP CALL (Setpoint call from the BMS (1 = call for heat)); BV 1 BAS PRIM PMP REQ (Primary pump request (1 = on)); AV 0 SETPOINT (Target supply temperature, 60-225 °F); BI 6 HEAT CALL (Heat call active); AI 0 Boil TARG (Target temperature in use, °F); AI 3 Boil SUP (Boiler plant supply temperature, °F); AI 4 Boil RET (Boiler plant return temperature, °F); AI 15 ERROR (Error code; 0 = no error).

How do I enable BMS control of the Watts tekmar Boiler Control 284?

Can the BMS supply sensor values to the Watts tekmar Boiler Control 284?

AV 5 takes an outdoor air temperature from the BAS; write -85 °F to mean no BAS sensor.

How do I check these points on the real tekmar Boiler Control 284?

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 Watts BACnet points lists

Source: Boiler Control 284 BAS Integration Manual · 284_B · rev. 08/14. Object names, instances and units are reproduced as published; descriptions are our own.