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Humidifier controller gateway (ProtoNode) · BACnet points list
Pure Humidifier Intac controller via ProtoNode FPC-N34 / FPC-N35 BACnet points list
Updated 6 November 2026
A ProtoNode FPC-N34 (BACnet MS/TP or BACnet IP) or FPC-N35 gateway reads the Pure Humidifier Intac controller over Modbus RTU and serves 90 analog value objects per humidifier: setpoints, timers, PID and sensor-scaling settings, configuration values, measured humidity and temperatures, heater power, water level and I/O error flags.
This page lists 90 BACnet objects for the Pure Humidifier Intac controller via ProtoNode FPC-N34 / FPC-N35 — 68 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from Pure Humidifier’s own free documentation, linked below.
- Manufacturer
- Pure Humidifier
- Model
- Intac controller via ProtoNode FPC-N34 / FPC-N35
- Equipment
- Humidifier controller gateway (ProtoNode)
- Equipment type
- Humidifiers
- BACnet objects
- 90 (68 writable)
- Transport
- BACnet IP, BACnet MS/TP
- Firmware
- Not stated
- Also known as
- Pure Humidifier Intac, Intac controller BACnet, ProtoNode FPC-N34 Pure Humidifier, FPC-N35 Pure Humidifier, Pure Humidifier BACnet
Reference only, provided as-is: verify against Pure Humidifier’s current documentation and the live device before use. Not official Pure Humidifier information. Terms of use.
BMS integration notes: Pure Humidifier Intac controller via ProtoNode FPC-N34 / FPC-N35
Set each Intac controller to Modbus RTU 38400 8-N-1 with a unique Node-ID, wire it to the ProtoNode, pick the BACnet profile on the S DIP switches and set the MAC and device instance, then read and write the AV objects.
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 5 | Operation Mode | Unit operating mode | Write |
| AV 1 | RH Set Point | Relative humidity setpoint | Write |
| AV 28 | Control Source | Control signal source | Write |
| AV 69 | Actual Humidity | Measured relative humidity | Read |
| AV 81 | Heater Power | Heater output | Read |
| AV 82 | Water Level | Tank water level status | Read |
| AV 87 | Interlock Input Open | Safety interlock open | Read |
Network setup
- Intac serial settings: Modbus RTU, 38400 baud, no parity, 8 data bits, 1 stop bit; Node-ID 1-255, unique per controller.
- S0-S2 DIP switches select the ProtoNode profile (BACnet MS/TP, BACnet IP, N2...).
- BACnet MS/TP MAC address 1-127 on the A-bank DIP switches; baud rate on its own DIP bank.
- Device instance = Node_Offset (default 50,000, set in the web configurator) + A-bank value.
Watch out for
- Many AV objects are configuration settings; avoid writing them cyclically.
Pure Humidifier Intac controller via ProtoNode FPC-N34 / FPC-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 | |||||
|---|---|---|---|---|---|---|
| AVmin | 1 | RH Set Point | Relative humidity setpoint (Modbus 102) | Write | ||
| AV | 2 | High Limit Set point | Duct high-limit RH setpoint (Modbus 103) | Write | ||
| AV | 3 | RH Low Alarm | RH Low Alarm (Modbus 104) | Write | ||
| AV | 4 | RH High Alarm | RH High Alarm (Modbus 105) | Write | ||
| AVmin | 5 | Operation Mode | Unit operating mode (Modbus 202) | Write | ||
| AV | 6 | Drain Duration Timer | Drain Duration Timer (Modbus 203) | Write | ||
| AV | 7 | Drain Interval timer | Drain Interval timer (Modbus 204) | Write | ||
| AV | 8 | Cool Down Delay | Cool Down Delay (Modbus 205) | Write | ||
| AV | 9 | Cool Down Temp | Cool Down Temp (Modbus 206) | Write | ||
| AV | 10 | Fill Delay Timer | Fill Delay Timer (Modbus 207) | Write | ||
| AV | 11 | Water Temp Set Point | Water Temp Set Point (Modbus 208) | Write | ||
| AV | 12 | Water Temp Hysteresis | Water Temp Hysteresis (Modbus 209) | Write | ||
| AV | 13 | End of Use Drain Timer | End of Use Drain Timer (Modbus 210) | Write | ||
| AV | 14 | Time to Clean Timer | Time to Clean Timer (Modbus 211) | Write | ||
| AV | 15 | Clean Reset | Reset the clean timer (Modbus 212) | Write | ||
| AV | 16 | Intac Address | Intac Address (Modbus 213) | Write | ||
| AV | 17 | Intac Baud Rate | Intac Baud Rate (Modbus 214) | Write | ||
| AV | 18 | Room Prop band | Room Prop band (Modbus 302) | Write | ||
| AV | 19 | Room hysteresis | Room hysteresis (Modbus 303) | Write | ||
| AV | 20 | Room Integral | Room Integral (Modbus 304) | Write | ||
| AV | 21 | Room Derivative | Room Derivative (Modbus 305) | Write | ||
| AV | 22 | Cycle Time | Cycle Time (Modbus 306) | Write | ||
| AV | 23 | Duct Prop Band | Duct Prop Band (Modbus 307) | Write | ||
| AV | 24 | Duct Hysteresis | Duct Hysteresis (Modbus 308) | Write | ||
| AV | 25 | Duct Integral | Duct Integral (Modbus 309) | Write | ||
| AV | 26 | Duct Derivative | Duct Derivative (Modbus 310) | Write | ||
| AV | 27 | RH Input filter | RH Input filter (Modbus 311) | Write | ||
| AVmin | 28 | Control Source | Control signal source (Modbus 503) | Write | ||
| AV | 29 | Water Sensor | Water Sensor (Modbus 504) | Write | ||
| AV | 30 | RH Sensor | RH Sensor (Modbus 505) | Write | ||
| AV | 31 | RH Process Low | RH Process Low (Modbus 506) | Write | ||
| AV | 32 | RH Process High | RH Process High (Modbus 507) | Write | ||
| AV | 33 | High Limit Sensor | High Limit Sensor (Modbus 509) | Write | ||
| AV | 34 | HighLimit Process Low | HighLimit Process Low (Modbus 510) | Write | ||
| AV | 35 | HighLimit Process High | HighLimit Process High (Modbus 511) | Write | ||
| AV | 36 | Outdoor Air Sensor | Outdoor Air Sensor (Modbus 512) | Write | ||
| AV | 37 | OAT Process Low | OAT Process Low (Modbus 513) | Write | ||
| AV | 38 | OAT Process High | OAT Process High (Modbus 514) | Write | ||
| AV | 39 | OAT Range Low | OAT Range Low (Modbus 515) | Write | ||
| AV | 40 | OAT Range High | OAT Range High (Modbus 516) | Write | ||
| AV | 41 | OAT Offset | OAT Offset (Modbus 517) | Write | ||
| AV | 42 | Process Output | Process Output (Modbus 518) | Write | ||
| AV | 43 | Out Process Low | Out Process Low (Modbus 519) | Write | ||
| AV | 44 | Out Process High | Out Process High (Modbus 520) | Write | ||
| AV | 45 | Dedicated Input | Dedicated Input (Modbus 521) | Write | ||
| AV | 46 | Temp units | Temp units (Modbus 522) | Write | ||
| AV | 47 | Capacity Units | Capacity Units (Modbus 523) | Write | ||
| AV | 48 | Unit Capacity | Unit Capacity (Modbus 524) | Write | ||
| AV | 49 | Menu access | Menu access (Modbus 526) | Write | ||
| AV | 50 | Control Type | Control Type (Modbus 702) | Write | ||
| AV | 51 | Active heaters | Active heaters (Modbus 703) | Write | ||
| AV | 52 | Water Enable | Water Enable (Modbus 704) | Write | ||
| AV | 53 | Air Enable | Air Enable (Modbus 705) | Write | ||
| AV | 54 | Water Level Sensor | Water Level Sensor (Modbus 706) | Write | ||
| AV | 55 | Drain Type | Drain Type (Modbus 707) | Write | ||
| AV | 56 | High limit enable | High limit enable (Modbus 708) | Write | ||
| AV | 57 | Clean Time | Clean Time (Modbus 709) | Write | ||
| AV | 58 | Gas Burners | Gas Burners (Modbus 710) | Write | ||
| AV | 59 | Low Fire Set point | Low Fire Set point (Modbus 711) | Write | ||
| AV | 60 | Low Fire Hysteresis | Low Fire Hysteresis (Modbus 712) | Write | ||
| AV | 61 | Burner #2 Set point | Burner #2 Set point (Modbus 713) | Write | ||
| AV | 62 | Burner #2 Hysteresis | Burner #2 Hysteresis (Modbus 714) | Write | ||
| AV | 63 | Burner #3 Set Point | Burner #3 Set Point (Modbus 715) | Write | ||
| AV | 64 | Burner #3 Hysteresis | Burner #3 Hysteresis (Modbus 716) | Write | ||
| AV | 65 | Post purge timer | Post purge timer (Modbus 717) | Write | ||
| AV | 66 | VFD Intensity | VFD Intensity (Modbus 718) | Write | ||
| AV | 67 | Range Checking | Range Checking (Modbus 719) | Write | ||
| AV | 68 | Low H2O Timer | Low H2O Timer (Modbus 720) | Write | ||
| AVmin | 69 | Actual Humidity | Measured relative humidity (Modbus 049) | Read | ||
| AV | 70 | Control RH Sensor | Control RH Sensor (Modbus 050) | Read | ||
| AV | 71 | High Limit RH Actual | High Limit RH Actual (Modbus 051) | Read | ||
| AV | 72 | High Limit RH Sensor | High Limit RH Sensor (Modbus 052) | Read | ||
| AV | 73 | Water Temp Actual | Tank water temperature (Modbus 053) | Read | ||
| AV | 74 | Water Sensor(temp) | Water Sensor(temp) (Modbus 054) | Read | ||
| AV | 75 | Outdoor Air Temp Actual | Outdoor air temperature (Modbus 055) | Read | ||
| AV | 76 | Outdoor Air Sensor | Outdoor Air Sensor (Modbus 056) | Read | ||
| AV | 77 | Heater #1 %Power | Heater #1 %Power (Modbus 823) | Read | ||
| AV | 78 | Heater #2 %Power | Heater #2 %Power (Modbus 824) | Read | ||
| AV | 79 | Heater #3 %Power | Heater #3 %Power (Modbus 825) | Read | ||
| AV | 80 | Heater #4 %Power | Heater #4 %Power (Modbus 826) | Read | ||
| AVmin | 81 | Heater Power | Total heater output (Modbus 853) | Read | ||
| AVmin | 82 | Water Level | Tank water level status (Modbus 831) | Read | ||
| AV | 83 | Accumulated Run Time | Total run time (Modbus 852) | Read | ||
| AV | 84 | Internal Module #1 I/O Error | Internal Module #1 I/O Error (Modbus 847) | Read | ||
| AV | 85 | Internal Module #2 I/O Error | Internal Module #2 I/O Error (Modbus 848) | Read | ||
| AV | 86 | Internal Module #3 I/O Error | Internal Module #3 I/O Error (Modbus 849) | Read | ||
| AVmin | 87 | Interlock Input Open | Safety interlock input open (Modbus 857) | Read | ||
| AV | 88 | Dedicated Input | Dedicated Input (Modbus 858) | Read | ||
| AV | 89 | Actual Water Level | Actual Water Level (Modbus 832) | Read | ||
| AV | 90 | Fill Valve Status | Fill valve state (Modbus 840) | Read |
No points match these filters.
Object ID lookup: Pure Humidifier Intac controller via ProtoNode FPC-N34 / FPC-N35 point IDs by name
AV1RH Set PointAV2High Limit Set pointAV3RH Low AlarmAV4RH High AlarmAV5Operation ModeAV6Drain Duration TimerAV7Drain Interval timerAV8Cool Down DelayAV9Cool Down TempAV10Fill Delay TimerAV11Water Temp Set PointAV12Water Temp HysteresisAV13End of Use Drain TimerAV14Time to Clean TimerAV15Clean ResetAV16Intac AddressAV17Intac Baud RateAV18Room Prop bandAV19Room hysteresisAV20Room IntegralAV21Room DerivativeAV22Cycle TimeAV23Duct Prop BandAV24Duct HysteresisAV25Duct IntegralAV26Duct DerivativeAV27RH Input filterAV28Control SourceAV29Water SensorAV30RH SensorAV31RH Process LowAV32RH Process HighAV33High Limit SensorAV34HighLimit Process LowAV35HighLimit Process HighAV36Outdoor Air SensorAV37OAT Process LowAV38OAT Process HighAV39OAT Range LowAV40OAT Range HighAV41OAT OffsetAV42Process OutputAV43Out Process LowAV44Out Process HighAV45Dedicated InputAV46Temp unitsAV47Capacity UnitsAV48Unit CapacityAV49Menu accessAV50Control TypeAV51Active heatersAV52Water EnableAV53Air EnableAV54Water Level SensorAV55Drain TypeAV56High limit enableAV57Clean TimeAV58Gas BurnersAV59Low Fire Set pointAV60Low Fire HysteresisAV61Burner #2 Set pointAV62Burner #2 HysteresisAV63Burner #3 Set PointAV64Burner #3 HysteresisAV65Post purge timerAV66VFD IntensityAV67Range CheckingAV68Low H2O TimerAV69Actual HumidityAV70Control RH SensorAV71High Limit RH ActualAV72High Limit RH SensorAV73Water Temp ActualAV74Water Sensor(temp)AV75Outdoor Air Temp ActualAV76Outdoor Air SensorAV77Heater #1 %PowerAV78Heater #2 %PowerAV79Heater #3 %PowerAV80Heater #4 %PowerAV81Heater PowerAV82Water LevelAV83Accumulated Run TimeAV84Internal Module #1 I/O ErrorAV85Internal Module #2 I/O ErrorAV86Internal Module #3 I/O ErrorAV87Interlock Input OpenAV88Dedicated InputAV89Actual Water LevelAV90Fill Valve Status
Integration notes
- Every object is an analog value; the table gives no units, states or read/write column. Access here is inferred: AV 1-68 (setpoints and settings) writable, AV 69-90 (measured values and status) read-only.
- Each description ends with the Intac Modbus register the object maps to.
- Device instance = Node_Offset (default 50,000) + the A-bank DIP switch value; further humidifiers on the same ProtoNode get the next instances.
- Up to 1,500 registers per ProtoNode at 90 per Intac controller.
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 Intac controller via ProtoNode FPC-N34 / FPC-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 Pure Humidifier Intac controller via ProtoNode FPC-N34 / FPC-N35
How many BACnet points does the Pure Humidifier Intac controller via ProtoNode FPC-N34 / FPC-N35 have?
This list has 90 BACnet objects: 90 analog values. The exact set on a given unit depends on its firmware, installed options and configuration.
Which Pure Humidifier Intac controller via ProtoNode FPC-N34 / FPC-N35 BACnet points are writable?
68 of the 90 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 Pure Humidifier Intac controller via ProtoNode FPC-N34 / FPC-N35 BACnet documentation?
The source is ProtoNode FPC-N34 and FPC-N35 Start-up Guide - For Interfacing Pure Humidifier Products: Intac Controller, revision Document Revision 4.B, published free by Pure Humidifier at https://www.purehumidifier.com/downloads/O%26M/ProtoNode_O%26M.pdf.
What are the minimum BACnet points to integrate the Pure Humidifier Intac controller via ProtoNode FPC-N34 / FPC-N35?
Start with AV 5 Operation Mode (Unit operating mode); AV 1 RH Set Point (Relative humidity setpoint); AV 28 Control Source (Control signal source); AV 69 Actual Humidity (Measured relative humidity); AV 81 Heater Power (Heater output); AV 82 Water Level (Tank water level status); AV 87 Interlock Input Open (Safety interlock open).
How do I check these points on the real Intac controller via ProtoNode FPC-N34 / FPC-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.
Source: ProtoNode FPC-N34 and FPC-N35 Start-up Guide - For Interfacing Pure Humidifier Products: Intac Controller · rev. Document Revision 4.B. Object names, instances and units are reproduced as published; descriptions are our own.