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Boiler controller gateway · BACnet points list
Patterson-Kelley ENVI boiler control (ProtoNode FPC-N34/N35) BACnet points list
Updated 6 November 2026
The ProtoNode maps the Patterson-Kelley ENVI boiler control to 53 objects: state, temperatures, firing rate, flame signal, error code, counters, safety input states and a second block of "ET" values, plus writable CH/DHW setpoints, boiler operation and outdoor reset settings.
This page lists 53 BACnet objects for the Patterson-Kelley ENVI boiler control (ProtoNode FPC-N34/N35) — 9 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from Patterson-Kelley’s own free documentation, linked below.
- Manufacturer
- Patterson-Kelley
- Model
- ENVI boiler control (ProtoNode FPC-N34/N35)
- Equipment
- Boiler controller gateway
- Equipment type
- Boilers & water heaters
- BACnet objects
- 53 (9 writable)
- Transport
- BACnet IP, BACnet MS/TP
- Firmware
- Not stated
- Also known as
- ENVI, P-K ENVI, Patterson-Kelley ENVI, ProtoNode FPC-N34
Reference only, provided as-is: verify against Patterson-Kelley’s current documentation and the live device before use. Not official Patterson-Kelley information. Terms of use.
BMS integration notes: Patterson-Kelley ENVI boiler control (ProtoNode FPC-N34/N35)
Run the boiler with Boiler Operation (AV 13) and send CH and DHW setpoints (AV 11/12). Read State, supply and return temperatures, firing rate, flame signal and the error code.
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 13 | Boiler Operation | 0 off, 1 on/pump auto, 2 off/pump on, 3 on/pump on | Write |
| AV 11 | CH Setpoint | Central heating setpoint | Write |
| AV 12 | DHW Setpoint | DHW setpoint | Write |
| AI 1 | State | Burner state; 9 = burning, 16-17 and 19-21 = errors | Read |
| AI 2 | Supply Temp | Supply water temperature | Read |
| AI 6 | Firing Rate | Firing rate | Read |
| AI 10 | Flame Signal | Flame signal; 128 = flame | Read |
| AI 20 | Error Code | Error code; see the manual notes | Read |
Enable & remote start
AV 13 Boiler Operation: 0 = boiler off & pump off, 1 = boiler on & pump auto, 2 = boiler off & pump on, 3 = boiler on & pump on. AV 11/12 are the CH and DHW setpoints; AV 14-19 set the outdoor reset curve and night setback.
Network setup
- ProtoNode FPC-N34 (BACnet MS/TP, BACnet IP, Metasys N2, Modbus TCP) or FPC-N35 (LonWorks).
- Boiler side: Modbus RTU, 9600 baud, 1 stop bit, no parity, 8 data bits; Node-ID 1-255 per boiler. Mixed ENVI/LOVE/NURO networks must run at 9600.
- BACnet device instance = Node_Offset (default 50,000) + Modbus Node-ID.
Watch out for
- Access is inferred from the N2 types.
- Error code meanings differ between ENVI firmware versions (01BD/BD71/49A7 vs 6999/79F2); see the notes under the table.
- The ENVI does not bias the RS-485 bus; the ProtoNode must provide bias.
Patterson-Kelley ENVI boiler control (ProtoNode FPC-N34/N35) 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.
| Description | States | |||||
|---|---|---|---|---|---|---|
| AImin | 1 | State | Burner state code | Read | 1=resetting, 2=standby, 3-4=relay circuit check, 5-6=pre-purging, 7=pre-ignition, 8=ignition, 9=burning, 10-11=post purging, 12=post pumping CH, 13=pumping CH, 14=post pumping DHW, 15=pumping DHW, 16=locking, 17=blocking, 18=restarting, 19-21=error handling | |
| AImin | 2 | Supply Temp | Read | |||
| AI | 3 | Return Temp | Read | |||
| AI | 4 | DHW Temp | Read | |||
| AI | 5 | Header Temp | Read | |||
| AImin | 6 | Firing Rate | Firing rate | Read | ||
| AI | 7 | Flue Gas Temp | Read | |||
| AI | 8 | HX Temp | Read | |||
| AI | 9 | Outside Temp | Read | |||
| AImin | 10 | Flame Signal | Flame signal code | Read | 0=no flame, 128=flame | |
| AVmin | 11 | CH Setpoint | Write | |||
| AVmin | 12 | DHW Setpoint | Write | |||
| AVmin | 13 | Boiler Operation | Write | 0=boiler off & pump off, 1=boiler on & pump auto, 2=boiler off & pump on, 3=boiler on & pump on | ||
| AV | 14 | High Outdoor Air Temp | Write | |||
| AV | 15 | Min Outdoor Air Setpoint | Write | |||
| AV | 16 | Low Outdoor Air Temp | Write | |||
| AV | 17 | Max Outdoor Air Setpoint | Write | |||
| AV | 18 | Outdoor Air Shutdown Temp | Write | |||
| AV | 19 | Night Setback | Write | |||
| AImin | 20 | Error Code | Error code; see the manual notes | Read | ||
| AI | 21 | Analog In | Read | |||
| AI | 22 | Analog Out | Read | |||
| AI | 23 | Ignitions | Read | |||
| AI | 24 | Burner High Hours | Read | |||
| AI | 25 | Burner Medium Hours | Read | |||
| AI | 26 | Burner Low Hours | Read | |||
| BI | 27 | Water Level | Read | |||
| BI | 28 | Low Gas Pressure | Read | |||
| BI | 29 | Air Pressure | Read | |||
| BI | 30 | Blocked Flue | Read | |||
| BI | 31 | CH Pump | Read | |||
| BI | 32 | DHW Pump | Read | |||
| BI | 33 | Air Damper | Read | |||
| BI | 34 | High Gas Pressure | Read | |||
| AI | 35 | ET Error Number | Read | |||
| AI | 36 | ET Supply Temp | Read | |||
| AI | 37 | ET Return Temp | Read | |||
| AI | 38 | ET DHW Temp | Read | |||
| AI | 39 | ET Flue Gas Temp | Read | |||
| AI | 40 | ET HX Temp | Read | |||
| AI | 41 | ET Outside Temp | Read | |||
| AI | 42 | Boiler State | Read | |||
| BI | 43 | Frost Protection | Read | |||
| BI | 44 | DHW Mode | Read | |||
| BI | 45 | CH Mode | Read | |||
| AI | 46 | ET Month | Read | |||
| AI | 47 | ET Day | Read | |||
| AI | 48 | ET Year | Read | |||
| AI | 49 | ET Hours | Read | |||
| AI | 50 | ET Minutes | Read | |||
| AI | 51 | ET Day Count High | Read | |||
| AI | 52 | ET Day Count Low | Read | |||
| AI | 53 | ET Run Hours | Read |
No points match these filters.
Object ID lookup: Patterson-Kelley ENVI boiler control point IDs by name
AI1StateAI2Supply TempAI3Return TempAI4DHW TempAI5Header TempAI6Firing RateAI7Flue Gas TempAI8HX TempAI9Outside TempAI10Flame SignalAV11CH SetpointAV12DHW SetpointAV13Boiler OperationAV14High Outdoor Air TempAV15Min Outdoor Air SetpointAV16Low Outdoor Air TempAV17Max Outdoor Air SetpointAV18Outdoor Air Shutdown TempAV19Night SetbackAI20Error CodeAI21Analog InAI22Analog OutAI23IgnitionsAI24Burner High HoursAI25Burner Medium HoursAI26Burner Low HoursBI27Water LevelBI28Low Gas PressureBI29Air PressureBI30Blocked FlueBI31CH PumpBI32DHW PumpBI33Air DamperBI34High Gas PressureAI35ET Error NumberAI36ET Supply TempAI37ET Return TempAI38ET DHW TempAI39ET Flue Gas TempAI40ET HX TempAI41ET Outside TempAI42Boiler StateBI43Frost ProtectionBI44DHW ModeBI45CH ModeAI46ET MonthAI47ET DayAI48ET YearAI49ET HoursAI50ET MinutesAI51ET Day Count HighAI52ET Day Count LowAI53ET Run Hours
Integration notes
- Appendix B.1 ENVI of the guide (pages 38-40).
- The table has no read/write column; access is inferred from the N2 type (AO/DO = writable).
- The guide is hosted on weil-mclain.com and prints no boiler brand (only the ProtoNode vendor code Harsco12); ENVI, LOVE and NURO are listed here under Patterson-Kelley.
- State, flame, operation and error code meanings come from the notes under the 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 ENVI boiler control (ProtoNode FPC-N34/N35) 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 Patterson-Kelley ENVI boiler control (ProtoNode FPC-N34/N35)
How many BACnet points does the Patterson-Kelley ENVI boiler control (ProtoNode FPC-N34/N35) have?
This list has 53 BACnet objects: 33 analog inputs, 9 analog values, 11 binary inputs. The exact set on a given unit depends on its firmware, installed options and configuration.
Which Patterson-Kelley ENVI boiler control (ProtoNode FPC-N34/N35) BACnet points are writable?
9 of the 53 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 Patterson-Kelley ENVI boiler control (ProtoNode FPC-N34/N35) BACnet documentation?
The source is ProtoNode FPC-N34 and FPC-N35 Startup Guide For Interfacing Products: ENVI, LOVE, NURO, Appendix B.1 ENVI (Document Revision 14.B), revision 2016-04 (effective date), published free by Patterson-Kelley at https://www.weil-mclain.com/wp-content/uploads/Nuro-Controller-ProtoNode-Startup-Guide_1.pdf.
What are the minimum BACnet points to integrate the Patterson-Kelley ENVI boiler control (ProtoNode FPC-N34/N35)?
Start with AV 13 Boiler Operation (0 off, 1 on/pump auto, 2 off/pump on, 3 on/pump on); AV 11 CH Setpoint (Central heating setpoint); AV 12 DHW Setpoint (DHW setpoint); AI 1 State (Burner state; 9 = burning, 16-17 and 19-21 = errors); AI 2 Supply Temp (Supply water temperature); AI 6 Firing Rate (Firing rate); AI 10 Flame Signal (Flame signal; 128 = flame); AI 20 Error Code (Error code; see the manual notes).
How do I enable BMS control of the Patterson-Kelley ENVI boiler control (ProtoNode FPC-N34/N35)?
AV 13 Boiler Operation: 0 = boiler off & pump off, 1 = boiler on & pump auto, 2 = boiler off & pump on, 3 = boiler on & pump on. AV 11/12 are the CH and DHW setpoints; AV 14-19 set the outdoor reset curve and night setback.
How do I check these points on the real ENVI boiler control (ProtoNode FPC-N34/N35)?
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 Patterson-Kelley BACnet points lists
- Boiler controller gateway
Patterson-Kelley LOVE controller (ProtoNode FPC-N34/N35)
Patterson-Kelley equipment with a LOVE temperature controller, read through the ProtoNode FPC-N34 / FPC-N35.
Also known as: LOVE, P-K LOVE, Patterson-Kelley LOVE, ProtoNode FPC-N34 - Boiler controller gateway
Patterson-Kelley NURO boiler control (ProtoNode FPC-N34/N35)
Patterson-Kelley boilers with the NURO control (SOLA based), read through the ProtoNode FPC-N34 / FPC-N35.
Also known as: NURO, P-K NURO, Patterson-Kelley NURO, ProtoNode FPC-N34
Source: ProtoNode FPC-N34 and FPC-N35 Startup Guide For Interfacing Products: ENVI, LOVE, NURO, Appendix B.1 ENVI · Document Revision 14.B · rev. 2016-04 (effective date). Object names, instances and units are reproduced as published; descriptions are our own.