Easy BACnetCommercial water heater controller · BACnet points list
Lochinvar Regent BACnet points list
Updated 28 October 2026
The Regent water heater shares the Crest communication manual but has its own BACnet MS/TP object map. It covers DHW thermostat and setpoint commands, safety switch and relay states, temperatures, flow rate, combustion values and status codes.
This page lists 63 BACnet objects for the Lochinvar Regent — 7 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from Lochinvar’s own free documentation, linked below.
- Manufacturer
- Lochinvar
- Model
- Regent
- Equipment
- Commercial water heater controller
- Equipment type
- Boilers & water heaters
- BACnet objects
- 63 (7 writable)
- Transport
- BACnet MS/TP
- Firmware
- Not stated
- Default device instance
- 680000 + MAC address (base can be changed)
- Also known as
- Regent IWH, IWH500-1000
BMS integration notes: Lochinvar Regent
The Regent water heater uses the same Modbus/BACnet board and configuration approach as the Crest: write AV 0 Configuration to say which values the BAS supplies, then command the DHW thermostat and setpoint. Most integrations simply read status, temperatures and the status, blocking 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 | Bitmask of BAS-supplied inputs; resend before commands | Write |
| BV 4 | DHW Thermostat | DHW call from the BAS | Write |
| AV 3 | DHW Setpoint | DHW setpoint from the BAS | Write |
| AI 13 | Unit Status Code | What the heater is doing; 40 = lockout | Read |
| AI 8 | Outlet Temperature | Heater outlet water temperature, °C | Read |
| AI 11 | Firing Rate | Burner firing rate, % | Read |
| AI 15 | Unit Lockout Code | Lockout cause; valid only when status code is 40 | Read |
Enable & remote start
Set the Demand Configuration under Main Menu > Setup > BMS. ENABLE active / BMS inactive: local setpoints plus an enable (BV 4, packed in AV 1). ENABLE and BMS active: enable plus the AV 2 setpoint command. Set the matching AV 0 bits first.
Heartbeat & communication loss
The Regent communication timer is fixed at 300 s; if communication stops longer than that the unit reverts to its own controls. When the BAS sends a setpoint command it must refresh it at least every 4 seconds or the unit reverts to its own inputs.
Sensors & values from the BMS
With the matching AV 0 bits set, the BAS can write AV 6 System Supply Temperature and AV 7 Building Recirculation Temperature (°C).
Network setup
- MAC address from dip switches 1-8 (master only, so 0-127); baud from switches 9-10: 9600, 19200, 38400 or 76800.
- Device instance = base 680000 + MAC address; the base can be changed.
Watch out for
- Resend the AV 0 configuration bits before each command.
- AI 4-6 units are misprinted as "5" in the manual; they are percentages.
Lochinvar Regent 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 | |||||
|---|---|---|---|---|---|---|
| BVmin | 4 | DHW Thermostat | Tank / DHW thermostat call | Write | ||
| BI | 0 | Hex Door Temperature Switch / MRHL | Safety / proving switch status | Read | ||
| BI | 1 | Flow Switch | Safety / proving switch status | Read | ||
| BI | 2 | Gas Pressure Switch 1 | Safety / proving switch status | Read | ||
| BI | 4 | Proof of Closure | Safety / proving switch status | Read | ||
| BI | 5 | Blocked Drain Switch | Safety / proving switch status | Read | ||
| BI | 7 | Flame 1 | Flame status | Read | ||
| BI | 10 | Blocked Vent Switch | Safety / proving switch status | Read | ||
| BI | 18 | Gas Pressure Switch 2 | Safety / proving switch status | Read | ||
| BI | 20 | Flue Damper Switch | Safety / proving switch status | Read | ||
| BI | 22 | Flame 2 | Flame status | Read | ||
| BI | 29 | DHW Thermostat | Tank / DHW thermostat call | Read | ||
| BI | 32 | Run Time Contacts | Output or relay status | Read | ||
| BI | 33 | Alarm Contacts | Output or relay status | Read | ||
| BI | 34 | Internal Circulation Pump | Output or relay status | Read | ||
| BI | 35 | Cascade Isolation Valve | Output or relay status | Read | ||
| BI | 37 | Gas Valve | Output or relay status | Read | ||
| BI | 40 | Building Recirculation Pump | Output or relay status | Read | ||
| BI | 43 | Flue Damper Output | Output or relay status | Read | ||
| BI | 48 | Main Fan | Output or relay status | Read | ||
| BI | 50 | External Spark / HSI | Output or relay status | Read | ||
| BI | 51 | Air Valve Trigger | Output or relay status | Read | ||
| BI | 52 | Air Proving Switch | Safety / proving switch status | Read | ||
| AI | 0 | Binary Inputs 0-15 | Packed word of binary inputs 0-15 | Read | ||
| AI | 1 | Binary Inputs 16-31 | Packed word of binary inputs 16-31 | Read | ||
| AI | 2 | Binary Inputs 32-47 | Packed word of binary inputs 32-47 | Read | ||
| AI | 3 | System / Cascade Setpoint | Setpoint value | °C | Read | |
| AI | 4 | System Pump Speed | Pump speed output | % | Read | |
| AI | 5 | Cascade Total Power | Total cascade firing capacity | % | Read | |
| AI | 6 | Cascade Current Power | Current cascade firing rate | % | Read | |
| AI | 7 | Outlet Setpoint | Setpoint value | °C | Read | |
| AImin | 8 | Outlet Temperature | Temperature reading | °C | Read | |
| AI | 9 | Inlet Temperature | Temperature reading | °C | Read | |
| AI | 10 | Flue Temperature | Temperature reading | °C | Read | |
| AImin | 11 | Firing Rate | Burner firing rate | % | Read | |
| AImin | 13 | Unit Status Code | Current operating status code | Read | ||
| AI | 14 | Unit Blocking Code | Active blocking (soft lockout) code | Read | ||
| AImin | 15 | Unit Lockout Code | Active lockout code | Read | ||
| AI | 18 | Air Damper Target Angle | Combustion / flow value | Read | ||
| AI | 19 | Gas Damper Target Angle | Combustion / flow value | Read | ||
| AI | 20 | Fan Speed Target | Combustion / flow value | Read | ||
| AI | 22 | O2 Sensor Status | Combustion / flow value | Read | ||
| AI | 23 | Current Trim Factor | Combustion / flow value | Read | ||
| AI | 24 | Barometer | Combustion / flow value | Read | ||
| AI | 25 | Binary Inputs 48-63 | Packed word of binary inputs 48-63 | Read | ||
| AI | 26 | Lock-Out Error Leader | Lockout flag for this cascade unit | Read | ||
| AI | 27 | Lock-Out Error Member 1 | Lockout flag for this cascade unit | Read | ||
| AI | 28 | Lock-Out Error Member 2 | Lockout flag for this cascade unit | Read | ||
| AI | 29 | Lock-Out Error Member 3 | Lockout flag for this cascade unit | Read | ||
| AI | 30 | Lock-Out Error Member 4 | Lockout flag for this cascade unit | Read | ||
| AI | 31 | Lock-Out Error Member 5 | Lockout flag for this cascade unit | Read | ||
| AI | 32 | Lock-Out Error Member 6 | Lockout flag for this cascade unit | Read | ||
| AI | 33 | Lock-Out Error Member 7 | Lockout flag for this cascade unit | Read | ||
| AI | 35 | Flame 1 | Flame status | Read | ||
| AI | 36 | Flame 2 | Flame status | Read | ||
| AI | 37 | Corrected O2 Reading | Combustion / flow value | Read | ||
| AI | 38 | Flow Rate | Combustion / flow value | Read | ||
| AVmin | 0 | Configuration | Bitmask selecting which values the BAS supplies | Write | ||
| AV | 1 | Coils | Packed word of the binary value commands | Write | ||
| AV | 2 | 0-10 Volt Input / Setpoint Command | BAS rate or setpoint command (0-100%) | % | Write | |
| AVmin | 3 | DHW Setpoint | Setpoint value | °C | Write | |
| AV | 6 | System Supply Temperature | Temperature reading | °C | Write | |
| AV | 7 | Building Recirculation Temperature | Temperature reading | °C | Write |
No points match these filters.
Integration notes
- BACnet needs the optional Lochinvar Modbus/BACnet communication board; address and baud rate are set on its dip switches.
- The BACnet board is an MS/TP master only, so MAC addresses 0-127 are usable.
- AV 0 (Configuration) is a bitmask: set a bit to 1 to make the water heater use the BAS-written value instead of its own input.
- BAS-supplied temperatures must be rewritten every few seconds and other commands at least every 4 minutes, or the unit reverts to local control.
- Temperatures are in °C on the bus.
- AI 4-6 units are misprinted as "5" in the manual; they are percentages.
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 Regent 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 Lochinvar Regent
How many BACnet points does the Lochinvar Regent have?
This list has 63 BACnet objects: 34 analog inputs, 6 analog values, 22 binary inputs, 1 binary value. The exact set on a given unit depends on its firmware, installed options and configuration.
Which Lochinvar Regent BACnet points are writable?
7 of the 63 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 Lochinvar Regent BACnet documentation?
The source is Modbus and BACnet Communication Instructions (Crest FB/OF751-6001, FCB1000-6000 & Regent IWH500-1000) (100161012_2000020084), revision Rev X, 04/26, published free by Lochinvar at https://assets.lochinvar.com/damroot/Original/10017/MODB_100161012_2000020084_REV%20X_(71343).pdf.
What are the minimum BACnet points to integrate the Lochinvar Regent?
Start with AV 0 Configuration (Bitmask of BAS-supplied inputs; resend before commands); BV 4 DHW Thermostat (DHW call from the BAS); AV 3 DHW Setpoint (DHW setpoint from the BAS); AI 13 Unit Status Code (What the heater is doing; 40 = lockout); AI 8 Outlet Temperature (Heater outlet water temperature, °C); AI 11 Firing Rate (Burner firing rate, %); AI 15 Unit Lockout Code (Lockout cause; valid only when status code is 40).
How do I enable BMS control of the Lochinvar Regent?
Set the Demand Configuration under Main Menu > Setup > BMS. ENABLE active / BMS inactive: local setpoints plus an enable (BV 4, packed in AV 1). ENABLE and BMS active: enable plus the AV 2 setpoint command. Set the matching AV 0 bits first.
Does the Lochinvar Regent need a BACnet heartbeat or have a communication timeout?
The Regent communication timer is fixed at 300 s; if communication stops longer than that the unit reverts to its own controls. When the BAS sends a setpoint command it must refresh it at least every 4 seconds or the unit reverts to its own inputs.
Can the BMS supply sensor values to the Lochinvar Regent?
With the matching AV 0 bits set, the BAS can write AV 6 System Supply Temperature and AV 7 Building Recirculation Temperature (°C).
How do I check these points on the real Regent?
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 Lochinvar BACnet points lists
- Commercial condensing water heater controller
Lochinvar Armor 1250-4000 water heater (SMART SYSTEM)
Lochinvar Armor volume water heaters, models 1250-4000, Series 100 and 101, with the SMART SYSTEM control and the Modbus/BACnet communication board.
Also known as: Armor, Armor 1250, Armor 4000, AWH, Armor Series 100, Armor Series 101, SMART SYSTEM, MTR-01, 100305786 - Condensing boiler controller
Lochinvar Crest
Crest FB/OF 751-6001 and FCB 1000-6000 condensing boilers (the manual uses the same map for Hellcat).
Also known as: Crest FB, Crest OF, Crest FCB, Hellcat - Condensing boiler / water heater controller
Lochinvar Knight / Armor (SMART TOUCH)
Knight, Knight XL, Armor, Wall Mount, Wall Hung, AQUAS, FTXL and Shield boilers and water heaters with the SMART TOUCH control.
Also known as: Knight XL, Outdoor Knight, Armor, Wall Mount, Wall Hung, AQUAS, FTXL, Shield, MODB-I-O - Dual-heat-exchanger condensing boiler controller
Lochinvar SYNC
SYNC 1.0, 1.3 and 1.5 condensing boilers (two heat exchangers, reported as unit 1 and unit 2).
Also known as: SYNC 1.0, SYNC 1.3, SYNC 1.5, SYNC-MODB
Source: Modbus and BACnet Communication Instructions (Crest FB/OF751-6001, FCB1000-6000 & Regent IWH500-1000) · 100161012_2000020084 · rev. Rev X, 04/26. Object names, instances and units are reproduced as published; descriptions are our own.