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MODBUS/BACnet Adapter 7350P-636 (BIC-926/928 boilers and water heaters)

Boiler and water heater BACnet adapter · BACnet points list

HTP MODBUS/BACnet Adapter 7350P-636 (BIC-926/928 boilers and water heaters) BACnet points list

Updated 7 November 2026

Short answer

The HTP 7350P-636 adapter plugs into the appliance's BIC-926/928 control and serves it on BACnet MS/TP (or Modbus RTU). It reports thermostat and safety inputs, pump, gas valve and alarm outputs, outlet, inlet and flue temperatures, firing rates and status/blocking/lockout codes for up to 8 cascaded boilers, and BIC-928 run-hour and fault counters. The BMS writes a configuration word that decides which values it supplies (enable, setpoint or rate, DHW setpoint, outdoor and system temperatures) and then writes those values.

This page lists 111 BACnet objects for the HTP MODBUS/BACnet Adapter 7350P-636 (BIC-926/928 boilers and water heaters) — 15 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from HTP’s own free documentation, linked below.

Manufacturer: HTP
Model: MODBUS/BACnet Adapter 7350P-636 (BIC-926/928 boilers and water heaters)
Equipment: Boiler and water heater BACnet adapter
Equipment type: Boilers & water heaters
BACnet objects: 111 (15 writable)
Transport: BACnet MS/TP
Firmware: Not stated
Also known as: 7350P-636, 64980290, HTP MODBUS/BACnet adapter, LP-548, BIC-928, BIC-926, EnduroTI, Elite Premier, Modcon, Modcon VWH, Pioneer, Versa Flame, Elite VWH, Phoenix
Source document: MODBUS / BACnet Adapter Installation Instructions (Part # 7350P-636) · LP-548 Rev. 000 Rel. 006 · rev. 2023-10-30

Download CSV 111 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 HTP’s current documentation and the live device before use. Not official HTP information. Terms of use.

BMS integration notes: HTP MODBUS/BACnet Adapter 7350P-636 (BIC-926/928 boilers and water heaters)

Integration in brief

Set the adapter for BACnet with its DIP switch, set the address and baud rate in the appliance installer menu, and discover it. Write AV 0 Configuration to say which values the BMS supplies, then write the coils (AV 1) for CH/DHW demand and the setpoint or rate (AV 2) and DHW setpoint (AV 3). Rewrite them at least once a minute, and read outlet temperature, firing rate and the status and lockout codes.

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 0	Configuration	Bits: which values the BMS supplies (1 = from BMS)	Write
AV 1	Coils	Demand bits: b0 room thermostat (CH), b4 tank (DHW)	Write
AV 2	0-10 volt / rate / setp	Setpoint or firing-rate command (0-10 V scale)	Write
AV 3	DHW setpoint	DHW setpoint from the BMS	Write
AI 8	Outlet Temp. 1	Outlet temperature	Read
AI 11	Firing Rate 1	Firing rate	Read
AI 13	Boil. 1 Status Code	Status code	Read
BI 33	Alarm cont. 1 (EXCEPT Versa Hydro)	Alarm output	Read
AI 15	Boil. 1 Lockout Code	Lockout code	Read

Enable & remote start

Set configuration bit B0 (boiler enable) or B1 (tank enable) in AV 0, then write the AV 1 Coils bits: b0 room thermostat (CH demand), b4 tank thermostat (DHW demand).

Heartbeat & communication loss

A 4-minute communication timer returns the appliance to its own controls if no write arrives; each write resets it. Update temperature values at least once a minute but not more than once a second.

Sensors & values from the BMS

Setting configuration bits B4-B7 makes the appliance use the BMS-written DHW temperature (AV 4), outdoor temperature (AV 5), system supply (AV 6) and system return (AV 7) instead of its own sensors.

Network setup

DIP switch 10 ON selects BACnet (OFF = Modbus); installer menu parameter 37 MODBUS MODE must be ON or AUTO (factory default OFF).
The appliance can also run on its own controls with the BMS only reading values (monitoring only).

Watch out for

While the BMS writes tank temperature and tank enable, the appliance ignores its internal DHW limit.
A bit set in AV 0 tells the appliance to ignore its own value and wait for the BMS one; leave bits clear for values it should measure itself.

HTP MODBUS/BACnet Adapter 7350P-636 (BIC-926/928 boilers and water heaters) 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.

111 of 111 shown

Type

Access

Units

Show

HTP MODBUS/BACnet Adapter 7350P-636 (BIC-926/928 boilers and water heaters) BACnet Points List
			Description			States
BV	0	En / Room Th1 / Stg 1			Write	0=Off, 1=On
BV	4	Tank thermostat			Write	0=Off, 1=On
BI	0	MHRL	water heater: High temp safety switch / High flue temp switch		Read	0=Off, 1=On
BI	1	Flow switch			Read	0=Off, 1=On
BI	2	Gas Press. Switch	BIC-928 only		Read	0=Off, 1=On
BI	4	Air Press Switch			Read	0=Off, 1=On
BI	5	Blocked drain	water heater: Blocked vent pressure switch		Read	0=Off, 1=On
BI	6	ARHL	water heater: High temp safety switch / High flue temp switch		Read	0=Off, 1=On
BI	7	Flame 1	water heater: Flame rectification probe		Read	0=Off, 1=On
BI	8	Enable / STG1			Read	0=Off, 1=On
BI	9	Tank th			Read	0=Off, 1=On
BI	10	STG2 / APS			Read	0=Off, 1=On
BI	32	Run-time cont. 1			Read	0=Off, 1=On
BImin	33	Alarm cont. 1 (EXCEPT Versa Hydro)	water heater: Alarm output		Read	0=Off, 1=On
BI	34	CH pump 1			Read	0=Off, 1=On
BI	35	DHW pump 1			Read	0=Off, 1=On
BI	37	Gas valve 1	water heater: Gas valve		Read	0=Off, 1=On
BI	38	Sys pump			Read	0=Off, 1=On
BI	48	Boiler 1 Run (same as 11118)	water heater: Run status		Read	0=Off, 1=On
BI	49	Boiler 2 Run (same as 10023)			Read	0=Off, 1=On
BI	50	Boiler 3 Run			Read	0=Off, 1=On
BI	51	Boiler 4 Run			Read	0=Off, 1=On
BI	52	Boiler 5 Run			Read	0=Off, 1=On
BI	53	Boiler 6 Run			Read	0=Off, 1=On
BI	54	Boiler 7 Run			Read	0=Off, 1=On
BI	55	Boiler 8 Run			Read	0=Off, 1=On
BI	56	Lockout 1 (same as 10034)	water heater: Lockout Status		Read	0=Off, 1=On
BI	57	Lockout 2 (same as 10042)			Read	0=Off, 1=On
BI	58	Lockout 3			Read	0=Off, 1=On
BI	59	Lockout 4			Read	0=Off, 1=On
BI	60	Lockout 5			Read	0=Off, 1=On
BI	61	Lockout 6			Read	0=Off, 1=On
BI	62	Lockout 7			Read	0=Off, 1=On
BI	63	Lockout 8			Read	0=Off, 1=On
BI	64	Alarm relais ecs (Versa Hydro ONLY)			Read	0=Off, 1=On
AI	0	Discrete Inputs 1-16	Packed discrete inputs 1-16		Read
AI	1	Discrete Inputs 17-32	Packed discrete inputs 17-32		Read
AI	2	Discrete Inputs 33-48	Packed discrete inputs 33-48		Read
AI	3	*System / Cascade Setp.	System / cascade setpoint (valid while heating)	°F	Read
AI	4	System Pump 4 speed		%	Read
AI	5	Cascade Total Power		%	Read
AI	6	Cascade Current Power		%	Read
AI	7	*Outlet Setp. 1	Boiler 1 outlet setpoint (valid while heating)	°F	Read
AImin	8	Outlet Temp. 1	water heater: Upper Temp Sensor	°F	Read
AI	9	Inlet Temp. 1	water heater: Lower Temp Sensor	°F	Read
AI	10	Flue Temp. 1		°F	Read
AImin	11	Firing Rate 1		%	Read
AI	12	Boil. 1 Pump speed 5		%	Read
AImin	13	Boil. 1 Status Code	water heater: Status Code 1		Read
AI	14	Boil. 1 Blocking Code	water heater: Blocking Code 1		Read
AImin	15	Boil. 1 Lockout Code	water heater: Lockout Code 1		Read
AI	17	Outlet Temp 2		°F	Read
AI	20	Firing Rate 2		%	Read
AI	21	Boil. 2 Pump 4 speed		%	Read
AI	22	Boil. 2 Status Code			Read
AI	23	Boil. 2 Blocking Code			Read
AI	24	Boil. 2 Lockout Code			Read
AI	25	Boiler Outlet 3		°F	Read
AI	26	Boiler 3 Firing Rate		%	Read
AI	27	Boiler 3 Status			Read
AI	28	Boiler 3 Lockout			Read
AI	29	Boiler Outlet 4		°F	Read
AI	30	Boiler 4 Firing Rate		%	Read
AI	31	Boiler 4 Status			Read
AI	32	Boiler 4 Lockout			Read
AI	33	Boiler Outlet 5		°F	Read
AI	34	Boiler 5 Firing Rate		%	Read
AI	35	Boiler 5 Status			Read
AI	36	Boiler 5 Lockout			Read
AI	37	Boiler Outlet 6		°F	Read
AI	38	Boiler 6 Firing Rate		%	Read
AI	39	Boiler 6 Status			Read
AI	40	Boiler 6 Lockout			Read
AI	41	Boiler Outlet 7		°F	Read
AI	42	Boiler 7 Firing Rate		%	Read
AI	43	Boiler 7 Status			Read
AI	44	Boiler 7 Lockout			Read
AI	45	Boiler Outlet 8		°F	Read
AI	46	Boiler 8 Firing Rate		%	Read
AI	47	Boiler 8 Status			Read
AI	48	Boiler 8 Lockout			Read
AI	49	Discrete Inputs 49 - 64	Packed discrete inputs 49-64		Read
AI	50	NTC 6 temperature		°F	Read
AI	51	NTC 7 temperature		°F	Read
AI	52	NTC 9 temperature		°F	Read
AI	53	Vortex 1 flow		L/min	Read
AI	54	Vortex 1 temp		°F	Read
AI	55	Vortex 2 flow		L/min	Read
AI	56	Vortex 2 temp		°F	Read
AI	90	Total Faults	BIC-928 only		Read
AI	91	Total Last Faults	BIC-928 only		Read
AI	92	Run Hours CH	BIC-928 only	h	Read
AI	93	Run Hours DHW	BIC-928 only	h	Read
AI	94	Run Hours Cas CH	BIC-928 only	h	Read
AI	95	Run Hours Cas DHW	BIC-928 only	h	Read
AI	96	Power Hours	BIC-928 only	h	Read
AI	98	Start Counter	BIC-928 only		Read
AI	99	Start Counter	BIC-928 only		Read
AVmin	0	Configuration	Configuration bits: which inputs come from the BMS		Write
AVmin	1	Coils	Coil bits: boiler enable (b0), tank enable (b4)		Write
AVmin	2	0-10 volt / rate / setp	Rate / setpoint command via 0-10 V scale; water heater: 0-10 volt / rate / set	V	Write
AVmin	3	DHW setpoint	DHW setpoint from the BMS; water heater: DHW set	°F	Write
AV	4	DHW temperatur	DHW tank temperature from the BMS; water heater: DHW temp	°F	Write
AV	5	Outdoor temp.	Outdoor temperature from the BMS; water heater: Outdoor Sensor	°F	Write
AV	6	Sys supply temp.	System supply temperature from the BMS	°F	Write
AV	7	Sys rtn temp.	System return temperature from the BMS	°F	Write
AV	8	I4 for direct	I4 offset	°F	Write
AV	9	CH post purge	CH post-purge time	s	Write
AV	10	DHW post purge	DHW post-purge time	s	Write
AV	11	Pump 4 Speed	Pump 4 speed	%	Write
AV	13	Extra out ECS	Extra 0-10 V output	%	Write

Object ID lookup: HTP MODBUS/BACnet Adapter 7350P-636 point IDs by name

BV0En / Room Th1 / Stg 1
BV4Tank thermostat
BI0MHRL
BI1Flow switch
BI2Gas Press. Switch
BI4Air Press Switch
BI5Blocked drain
BI6ARHL
BI7Flame 1
BI8Enable / STG1
BI9Tank th
BI10STG2 / APS
BI32Run-time cont. 1
BI33Alarm cont. 1 (EXCEPT Versa Hydro)
BI34CH pump 1
BI35DHW pump 1
BI37Gas valve 1
BI38Sys pump
BI48Boiler 1 Run (same as 11118)
BI49Boiler 2 Run (same as 10023)
BI50Boiler 3 Run
BI51Boiler 4 Run
BI52Boiler 5 Run
BI53Boiler 6 Run
BI54Boiler 7 Run
BI55Boiler 8 Run
BI56Lockout 1 (same as 10034)
BI57Lockout 2 (same as 10042)
BI58Lockout 3
BI59Lockout 4
BI60Lockout 5
BI61Lockout 6
BI62Lockout 7
BI63Lockout 8
BI64Alarm relais ecs (Versa Hydro ONLY)
AI0Discrete Inputs 1-16
AI1Discrete Inputs 17-32
AI2Discrete Inputs 33-48
AI3*System / Cascade Setp.
AI4System Pump 4 speed
AI5Cascade Total Power
AI6Cascade Current Power
AI7*Outlet Setp. 1
AI8Outlet Temp. 1
AI9Inlet Temp. 1
AI10Flue Temp. 1
AI11Firing Rate 1
AI12Boil. 1 Pump speed 5
AI13Boil. 1 Status Code
AI14Boil. 1 Blocking Code
AI15Boil. 1 Lockout Code
AI17Outlet Temp 2
AI20Firing Rate 2
AI21Boil. 2 Pump 4 speed
AI22Boil. 2 Status Code
AI23Boil. 2 Blocking Code
AI24Boil. 2 Lockout Code
AI25Boiler Outlet 3
AI26Boiler 3 Firing Rate
AI27Boiler 3 Status
AI28Boiler 3 Lockout
AI29Boiler Outlet 4
AI30Boiler 4 Firing Rate
AI31Boiler 4 Status
AI32Boiler 4 Lockout
AI33Boiler Outlet 5
AI34Boiler 5 Firing Rate
AI35Boiler 5 Status
AI36Boiler 5 Lockout
AI37Boiler Outlet 6
AI38Boiler 6 Firing Rate
AI39Boiler 6 Status
AI40Boiler 6 Lockout
AI41Boiler Outlet 7
AI42Boiler 7 Firing Rate
AI43Boiler 7 Status
AI44Boiler 7 Lockout
AI45Boiler Outlet 8
AI46Boiler 8 Firing Rate
AI47Boiler 8 Status
AI48Boiler 8 Lockout
AI49Discrete Inputs 49 - 64
AI50NTC 6 temperature
AI51NTC 7 temperature
AI52NTC 9 temperature
AI53Vortex 1 flow
AI54Vortex 1 temp
AI55Vortex 2 flow
AI56Vortex 2 temp
AI90Total Faults
AI91Total Last Faults
AI92Run Hours CH
AI93Run Hours DHW
AI94Run Hours Cas CH
AI95Run Hours Cas DHW
AI96Power Hours
AI98Start Counter
AI99Start Counter
AV0Configuration
AV1Coils
AV20-10 volt / rate / setp
AV3DHW setpoint
AV4DHW temperatur
AV5Outdoor temp.
AV6Sys supply temp.
AV7Sys rtn temp.
AV8I4 for direct
AV9CH post purge
AV10DHW post purge
AV11Pump 4 Speed
AV13Extra out ECS

Integration notes

The manual table gives no object names; names here are the 'Heating Appliance' descriptions. Where the water heater meaning differs it is in the description.
The manual header gives part # 64980290; HTP sells the adapter as 7350P-636. The source PDF is scanned (image only); this list was keyed from the page images and checked row by row.
Objects marked BIC-928 only (bold italics in the manual) do not exist on BIC-926 appliances.
Access is not printed per object: AV and BV (holding registers / coils) are taken as writable, AI and BI as read-only.
Temperatures are °F with 0.1 resolution; setpoint objects marked * are only valid during a heating cycle. AI 92-96 counts are in units of 5 hours (x5 resolution).
AV 12 (Pump 5 speed) is referenced in the configuration bits but not printed in the object table.

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 MODBUS/BACnet Adapter 7350P-636 (BIC-926/928 boilers and water heaters) 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 HTP MODBUS/BACnet Adapter 7350P-636 (BIC-926/928 boilers and water heaters)

How many BACnet points does the HTP MODBUS/BACnet Adapter 7350P-636 (BIC-926/928 boilers and water heaters) have?

This list has 111 BACnet objects: 63 analog inputs, 13 analog values, 33 binary inputs, 2 binary values. The exact set on a given unit depends on its firmware, installed options and configuration.

Which HTP MODBUS/BACnet Adapter 7350P-636 (BIC-926/928 boilers and water heaters) BACnet points are writable?

15 of the 111 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 HTP MODBUS/BACnet Adapter 7350P-636 (BIC-926/928 boilers and water heaters) BACnet documentation?

The source is MODBUS / BACnet Adapter Installation Instructions (Part # 7350P-636) (LP-548 Rev. 000 Rel. 006), revision 2023-10-30, published free by HTP at https://htproducts.com/literature/lp-548.pdf.

What are the minimum BACnet points to integrate the HTP MODBUS/BACnet Adapter 7350P-636 (BIC-926/928 boilers and water heaters)?

Start with AV 0 Configuration (Bits: which values the BMS supplies (1 = from BMS)); AV 1 Coils (Demand bits: b0 room thermostat (CH), b4 tank (DHW)); AV 2 0-10 volt / rate / setp (Setpoint or firing-rate command (0-10 V scale)); AV 3 DHW setpoint (DHW setpoint from the BMS); AI 8 Outlet Temp. 1 (Outlet temperature); AI 11 Firing Rate 1 (Firing rate); AI 13 Boil. 1 Status Code (Status code); BI 33 Alarm cont. 1 (EXCEPT Versa Hydro) (Alarm output); AI 15 Boil. 1 Lockout Code (Lockout code).

How do I enable BMS control of the HTP MODBUS/BACnet Adapter 7350P-636 (BIC-926/928 boilers and water heaters)?

Set configuration bit B0 (boiler enable) or B1 (tank enable) in AV 0, then write the AV 1 Coils bits: b0 room thermostat (CH demand), b4 tank thermostat (DHW demand).

Does the HTP MODBUS/BACnet Adapter 7350P-636 (BIC-926/928 boilers and water heaters) need a BACnet heartbeat or have a communication timeout?

A 4-minute communication timer returns the appliance to its own controls if no write arrives; each write resets it. Update temperature values at least once a minute but not more than once a second.

Can the BMS supply sensor values to the HTP MODBUS/BACnet Adapter 7350P-636 (BIC-926/928 boilers and water heaters)?

Setting configuration bits B4-B7 makes the appliance use the BMS-written DHW temperature (AV 4), outdoor temperature (AV 5), system supply (AV 6) and system return (AV 7) instead of its own sensors.

How do I check these points on the real MODBUS/BACnet Adapter 7350P-636 (BIC-926/928 boilers and water heaters)?

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: MODBUS / BACnet Adapter Installation Instructions (Part # 7350P-636) · LP-548 Rev. 000 Rel. 006 · rev. 2023-10-30. Object names, instances and units are reproduced as published; descriptions are our own.