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Air handling unit / make-up air controller · BACnet points list
Reznor PREEVA Air Handler Controls CP-AHU D19 / D21 / D22 (BACnet MS/TP Option BHB8) BACnet points list
Updated 6 November 2026
On PREEVA air handlers with control options D19, D21 and D22, an optional BMS card (option BHB8) gives BACnet MS/TP access to the unit controller. The BMS can enable the unit, choose the occupancy source and send occupancy, select auto/cool/heat/off, reset alarms, write discharge air and space setpoints, building and duct static pressure, CO2 and humidity setpoints, command damper and supply fan output, send fan/heat/cool/dehumidify calls and share outdoor temperature and humidity. It reads temperatures, mode flags, stage commands, fan, filter, safety and phase status.
This page lists 83 BACnet objects for the Reznor PREEVA Air Handler Controls CP-AHU D19 / D21 / D22 (BACnet MS/TP Option BHB8) — 33 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from Reznor’s own free documentation, linked below.
- Manufacturer
- Reznor
- Model
- PREEVA Air Handler Controls CP-AHU D19 / D21 / D22 (BACnet MS/TP Option BHB8)
- Equipment
- Air handling unit / make-up air controller
- Equipment type
- Rooftop units, AHUs & DOAS
- BACnet objects
- 83 (33 writable)
- Transport
- BACnet MS/TP
- Firmware
- Not stated
- Default device instance
- 76000
- Also known as
- CP-AHU D19_D21_D22, D303072-A, PREEVA-CONTROLS, D19, D21, D22, BHB8, PDH, PEH, PXH, RDH, REH, RHH, RXH, SDH, SHH, Preeva
Reference only, provided as-is: verify against Reznor’s current documentation and the live device before use. Not official Reznor information. Terms of use.
BMS integration notes: Reznor PREEVA Air Handler Controls CP-AHU D19 / D21 / D22 (BACnet MS/TP Option BHB8)
Set the MS/TP instance, baud and MAC in Service > BMS Config (Termconf PlugIn = Yes), save with Function = Write and power cycle. Enable the unit with BV 32, set OccMode_Sel (AV 1009) to 2 and command occupancy with BV 30, choose the state with AV 1010 and write the discharge or space setpoints. Monitor the supply fan status, discharge temperature and the general alarm relay.
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 32 | Unit_Enable | Unit enable | Write |
| BV 30 | Occupied_BMS | Occupancy command (needs AV 1009 = 2) | Write |
| AV 1009 | OccMode_Sel | Occupancy source: 0 schedule, 1 input, 2 BMS | Write |
| AV 1010 | State_Sel | Unit state: 2 auto, 3 cool, 4 heat, 5 off | Write |
| AV 15 | SpcTempSP | Space temperature setpoint, 65-85 °F | Write |
| BV 31 | BMS_Alm_Rst | Alarm reset | Write |
| BV 21 | SF_Sts | Supply fan status | Read |
| AV 6 | DA_Temp | Discharge air temperature | Read |
| BV 20 | Alm_Rly_Cmd | General alarm relay on | Read |
Enable & remote start
BV 32 Unit_Enable enables the unit. Occupancy comes from the schedule, a digital input or the BMS, chosen with AV 1009 OccMode_Sel; with 2 = BMS, BV 30 Occupied_BMS sets occupancy. AV 1010 State_Sel picks auto, cool, heat or off. BV 37-40 are BMS fan, heat, cool and dehumidify calls.
Sensors & values from the BMS
Set BV 27 OA_Temp_Sel or BV 28 OA_Hum_Sel to 1 (BMS) and write AV 3 OA_Temp_BMS or AV 4 OA_Hum_BMS.
Network setup
- Default MS/TP instance 76000, baud 38400 (9600, 19200, 38400 or 76800).
- Settings: Service > h. BMS Config; set Termconf PlugIn to Yes, then Instance, Baudrate and MAC on screen E.h.4.
- Save on screen E.h.7 (Function = Write, Update = Yes) and power cycle the controller.
- Jumpers P1-P3 on the card add bias and 120 ohm termination; fit them on the units at each end of the trunk.
Watch out for
- Static pressure integers are scaled x1000.
- BV 30 has no effect unless AV 1009 is set to 2 (BMS).
Reznor PREEVA Air Handler Controls CP-AHU D19 / D21 / D22 (BACnet MS/TP Option BHB8) 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 | |||||
|---|---|---|---|---|---|---|
| AV | 1 | OA_Temp_Raw | Outside Air Temp | °F | Read | |
| AV | 2 | OA_Hum_Raw | Outside Air Humidity | %RH | Read | |
| AV | 3 | OA_Temp_BMS | Outside air temp from BMS; used when OA_Temp_Sel = 1 (BMS) | °F | Write | |
| AV | 4 | OA_Hum_BMS | Outside air humidity from BMS; used when OA_Hum_Sel = 1 (BMS) | %RH | Write | |
| AV | 5 | OA_Dew_Point | Outside Air Dew Point | °F | Read | |
| AVmin | 6 | DA_Temp | Discharge Air Temp | °F | Read | |
| AV | 7 | CC_Temp | Cooling Coil Discharge Air Temp | °F | Read | |
| AV | 8 | MA_Temp | Mixed Air Temp | °F | Read | |
| AV | 9 | DA_SpcClg_SP | Discharge Air Temp Space Cooling SP; default 55, range 50 to 100 | °F | Write | |
| AV | 10 | DA_SpcHtg_SP | Discharge Air Temp Space Heating Sp; default 90, range 50 to 140 | °F | Write | |
| AV | 11 | DA_NAClg_SP | Discharge Air Temp Neutral Cooling SP; default 70, range 50 to 100 | °F | Write | |
| AV | 12 | DA_NAHtg_SP | Discharge Air Temp Neutral Heating SP; default 70, range 50 to 140 | °F | Write | |
| AV | 13 | DA_SpcHtCl_SP | Discharge Air Temp Space Heat Mode Cooling SP; default 55, range 50 to 100 | °F | Write | |
| AV | 14 | DA_SP | Discharge Air Temp Active SP | °F | Read | |
| AVmin | 15 | SpcTempSP | Space Temp SP; default 72, range 65 to 85 | °F | Write | |
| AV | 16 | SpcEffClgSP | Space Effective Cooling SP | °F | Read | |
| AV | 17 | SpcEffHtgSP | Space Effective Heating SP | °F | Read | |
| AV | 18 | Spc_Temp | Space Temp | °F | Read | |
| AV | 19 | OAChgOv_SP | OA Change Over SP; default 65, range 45 to 80 | °F | Write | |
| AV | 20 | DhOADP_SP | Dehum OA Dew Point SP; default 58, range 50 to 100 | °F | Write | |
| AV | 21 | Damper_BMS | Damper Output BMS Command; range 0 to 100 | % | Write | |
| AV | 22 | Damper_Cmd | Damper Output Command; range 0 to 100 | % | Read | |
| AV | 23 | SF_BMS | Supply Fan Output BMS Command; range 0 to 100 | % | Write | |
| AV | 24 | SF_VFD_Cmd | Supply Fan VFD Command; range 0 to 100 | % | Read | |
| AV | 25 | HX_Mod_Cmd | Heating Modulation Command; range 0 to 100 | % | Read | |
| AV | 26 | RH_Mod_Out | Reheat Modulation Output %; range 0 to 100 | % | Read | |
| AV | 27 | MinDmprSP | Minimum Damper SP; default 10, range 0 to 100 | % | Write | |
| AV | 28 | EC_OADPLO_SP | Economizer OA Dew Point Lockout SP; default 58, range 0 to 120 | °F | Write | |
| AV | 29 | EC_OALO_SP | Economizer OA Temp Lockout SP; default 60, range 0 to 120 | °F | Write | |
| AV | 30 | CO2DmprOsSP | CO2 Minimum Damper Offset SP; default 10, range 0 to 100 | % | Write | |
| AV | 31 | DA_BMS_SP | Discharge Air Temp BMS SP; range 50 to 140 | °F | Write | |
| AV | 32 | DA_Dh_SP | Discharge Air Temp Dehum SP; default 70, range 50 to 100 | °F | Write | |
| AV | 1001 | Bldg_Press_SP | Building Static Pressure SP; default 100, range -500 to 500 (value x1000) | in. w.c. | Write | |
| AV | 1002 | Bldg_Pressure | Building Static Pressure (value x1000) | in. w.c. | Read | |
| AV | 1003 | Duct_Press_SP | Duct Static Pressure SP; default 500, range 0 to 2500 (value x1000) | in. w.c. | Write | |
| AV | 1004 | Duct_Pressure | Duct Static Pressure (value x1000) | in. w.c. | Read | |
| AV | 1005 | SpcCO2SP | Space CO2 SP; default 1000, range 0 to 2000 | ppm | Write | |
| AV | 1006 | Spc_CO2 | Space CO2 | ppm | Read | |
| AV | 1007 | SpcHumSP | Space Humidity SP; default 55, range 35 to 75 | %RH | Write | |
| AV | 1008 | Spc_Hum | Space Humidity | %RH | Read | |
| AVmin | 1009 | OccMode_Sel | Occupancy mode source select; default 1 | Write | 0=Schedule, 1=Digital input, 2=BMS | |
| AVmin | 1010 | State_Sel | Unit state select; default 5 | Write | 2=Auto, 3=Cool, 4=Heat, 5=Off | |
| BV | 1 | Ext_OCC | Occupied Mode Input | Read | Off/On | |
| BV | 2 | NA_Clg_Md | Neutral Air Cooling Mode | Read | Off/On | |
| BV | 3 | NA_Htg_Md | Neutral Air Heating Mode | Read | Off/On | |
| BV | 4 | NA_Dehum_Md | Neutral Air Dehum Mode | Read | Off/On | |
| BV | 5 | Spc_Clg_Md | Space Cooling Mode | Read | Off/On | |
| BV | 6 | Spc_Htg_Md | Space Heating Mode | Read | Off/On | |
| BV | 7 | Spc_Dehum_Md | Space Dehum Mode | Read | Off/On | |
| BV | 8 | Spc_HtgClg_Md | Space Heating Cooling Mode | Read | Off/On | |
| BV | 9 | SF_Cmd | Supply Fan Command | Read | Off/On | |
| BV | 10 | Comp_Stg1_Cmd | Compressor Stage 1 Command | Read | Off/On | |
| BV | 11 | Comp_Stg2_Cmd | Compressor Stage 2 Command | Read | Off/On | |
| BV | 12 | Comp_Stg3_Cmd | Compressor Stage 3 Command | Read | Off/On | |
| BV | 13 | HX_Stg1_Cmd | Heating Stage 1 Command | Read | Off/On | |
| BV | 14 | HX_Stg2_Cmd | Heating Stage 2 Command | Read | Off/On | |
| BV | 15 | HX_Stg3_Cmd | Heating Stage 3 Command | Read | Off/On | |
| BV | 16 | HX_Stg4_Cmd | Heating Stage 4 Command | Read | Off/On | |
| BV | 17 | HX_Stg5_Cmd | Heating Stage 5 Command | Read | Off/On | |
| BV | 18 | HX_Stg6_Cmd | Heating Stage 6 Command | Read | Off/On | |
| BV | 19 | RH_Cmd | Reheat Compressor Command | Read | Off/On | |
| BVmin | 20 | Alm_Rly_Cmd | Unit General Alarm Relay Command | Read | Off/On | |
| BVmin | 21 | SF_Sts | Supply Fan Status | Read | Off/On | |
| BV | 22 | Filter_Sts | Dirty Filter Status | Read | Off/On | |
| BV | 23 | Safety_Sts | Safety Input Status | Read | Normal/Alarm | |
| BV | 24 | Phase_Alarm | Phase Protection Alarm | Read | Off/On | |
| BV | 25 | Ext_Switch_1 | External Damper Position Sw 1 | Read | Off/On | |
| BV | 26 | Ext_Switch_2 | External Damper Position Sw 2 | Read | Off/On | |
| BV | 27 | OA_Temp_Sel | Share OA Temp from BMS (0=Probe 1=BMS); default Off | Write | Off/On | |
| BV | 28 | OA_Hum_Sel | Share OA Humidity from BMS (0=Probe 1=BMS); default Off | Write | Off/On | |
| BV | 29 | Occupied | Occupied Mode Status | Read | Off/On | |
| BVmin | 30 | Occupied_BMS | Occupied Mode BMS - Sets Unit Occupancy when OccMode_Sel is set to 2=BMS; default Off | Write | Off/On | |
| BVmin | 31 | BMS_Alm_Rst | BMS Alarm Reset; default Off | Write | Off/On | |
| BVmin | 32 | Unit_Enable | Unit Enable; default Off | Write | Off/On | |
| BV | 33 | Ext_Call_Fan | External Call Fan Input (G) | Read | Off/On | |
| BV | 34 | Ext_Call_Heat | External Call Heat Input (W1) | Read | Off/On | |
| BV | 35 | Ext_Call_Cool | External Call Cool Input (Y1) | Read | Off/On | |
| BV | 36 | Ext_Call_Dh | External Call Dehum Input | Read | Off/On | |
| BV | 37 | BMS_Call_Fan | BMS Fan Call Input (G); default Off | Write | Off/On | |
| BV | 38 | BMS_Call_Heat | BMS Heat Call Input (W1); default Off | Write | Off/On | |
| BV | 39 | BMS_Call_Cool | BMS Cool Call Input (Y1); default Off | Write | Off/On | |
| BV | 40 | BMS_Call_Dh | BMS Call Dehum Input; default Off | Write | Off/On | |
| BV | 41 | Evap_Stg1_Cmd | Evap Cooling Command | Read | Off/On |
No points match these filters.
Object ID lookup: Reznor PREEVA Air Handler Controls CP-AHU D19 / D21 / D22 point IDs by name
AV1OA_Temp_RawAV2OA_Hum_RawAV3OA_Temp_BMSAV4OA_Hum_BMSAV5OA_Dew_PointAV6DA_TempAV7CC_TempAV8MA_TempAV9DA_SpcClg_SPAV10DA_SpcHtg_SPAV11DA_NAClg_SPAV12DA_NAHtg_SPAV13DA_SpcHtCl_SPAV14DA_SPAV15SpcTempSPAV16SpcEffClgSPAV17SpcEffHtgSPAV18Spc_TempAV19OAChgOv_SPAV20DhOADP_SPAV21Damper_BMSAV22Damper_CmdAV23SF_BMSAV24SF_VFD_CmdAV25HX_Mod_CmdAV26RH_Mod_OutAV27MinDmprSPAV28EC_OADPLO_SPAV29EC_OALO_SPAV30CO2DmprOsSPAV31DA_BMS_SPAV32DA_Dh_SPAV1001Bldg_Press_SPAV1002Bldg_PressureAV1003Duct_Press_SPAV1004Duct_PressureAV1005SpcCO2SPAV1006Spc_CO2AV1007SpcHumSPAV1008Spc_HumAV1009OccMode_SelAV1010State_SelBV1Ext_OCCBV2NA_Clg_MdBV3NA_Htg_MdBV4NA_Dehum_MdBV5Spc_Clg_MdBV6Spc_Htg_MdBV7Spc_Dehum_MdBV8Spc_HtgClg_MdBV9SF_CmdBV10Comp_Stg1_CmdBV11Comp_Stg2_CmdBV12Comp_Stg3_CmdBV13HX_Stg1_CmdBV14HX_Stg2_CmdBV15HX_Stg3_CmdBV16HX_Stg4_CmdBV17HX_Stg5_CmdBV18HX_Stg6_CmdBV19RH_CmdBV20Alm_Rly_CmdBV21SF_StsBV22Filter_StsBV23Safety_StsBV24Phase_AlarmBV25Ext_Switch_1BV26Ext_Switch_2BV27OA_Temp_SelBV28OA_Hum_SelBV29OccupiedBV30Occupied_BMSBV31BMS_Alm_RstBV32Unit_EnableBV33Ext_Call_FanBV34Ext_Call_HeatBV35Ext_Call_CoolBV36Ext_Call_DhBV37BMS_Call_FanBV38BMS_Call_HeatBV39BMS_Call_CoolBV40BMS_Call_DhBV41Evap_Stg1_Cmd
Integration notes
- The point list is the CP-AHU D19/D21/D22 form (11-17, D303072-A) reprinted inside the combined PREEVA controls guide (06-26).
- Analog variables are AV 1-32, integer variables AV 1001-1010 and digital variables BV 1-41.
- Building and duct static pressure (AV 1001-1004) must be divided by 1000 in the BMS.
- Defaults and ranges are shown as printed; where only two numbers are printed they are taken as the range.
- Source: BACnet Point List, guide pages 89-91 (form pages 45-47).
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 PREEVA Air Handler Controls CP-AHU D19 / D21 / D22 (BACnet MS/TP Option BHB8) 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 Reznor PREEVA Air Handler Controls CP-AHU D19 / D21 / D22 (BACnet MS/TP Option BHB8)
How many BACnet points does the Reznor PREEVA Air Handler Controls CP-AHU D19 / D21 / D22 (BACnet MS/TP Option BHB8) have?
This list has 83 BACnet objects: 42 analog values, 41 binary values. The exact set on a given unit depends on its firmware, installed options and configuration.
Which Reznor PREEVA Air Handler Controls CP-AHU D19 / D21 / D22 (BACnet MS/TP Option BHB8) BACnet points are writable?
33 of the 83 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 Reznor PREEVA Air Handler Controls CP-AHU D19 / D21 / D22 (BACnet MS/TP Option BHB8) BACnet documentation?
The source is Control System Guide for Air Handlers - Options DG1, DG2, DG5, DG6, D12B-G, D19, D21 and D22 for discontinued PREEVA models (PREEVA-CONTROLS (06-26) REV-A), revision 2026-06, published free by Reznor at https://assets.reznorhvac.com/download/411F898A-183E-43E5-A8C5-F2A7520D91A4.
What are the minimum BACnet points to integrate the Reznor PREEVA Air Handler Controls CP-AHU D19 / D21 / D22 (BACnet MS/TP Option BHB8)?
Start with BV 32 Unit_Enable (Unit enable); BV 30 Occupied_BMS (Occupancy command (needs AV 1009 = 2)); AV 1009 OccMode_Sel (Occupancy source: 0 schedule, 1 input, 2 BMS); AV 1010 State_Sel (Unit state: 2 auto, 3 cool, 4 heat, 5 off); AV 15 SpcTempSP (Space temperature setpoint, 65-85 °F); BV 31 BMS_Alm_Rst (Alarm reset); BV 21 SF_Sts (Supply fan status); AV 6 DA_Temp (Discharge air temperature); BV 20 Alm_Rly_Cmd (General alarm relay on).
How do I enable BMS control of the Reznor PREEVA Air Handler Controls CP-AHU D19 / D21 / D22 (BACnet MS/TP Option BHB8)?
BV 32 Unit_Enable enables the unit. Occupancy comes from the schedule, a digital input or the BMS, chosen with AV 1009 OccMode_Sel; with 2 = BMS, BV 30 Occupied_BMS sets occupancy. AV 1010 State_Sel picks auto, cool, heat or off. BV 37-40 are BMS fan, heat, cool and dehumidify calls.
Can the BMS supply sensor values to the Reznor PREEVA Air Handler Controls CP-AHU D19 / D21 / D22 (BACnet MS/TP Option BHB8)?
Set BV 27 OA_Temp_Sel or BV 28 OA_Hum_Sel to 1 (BMS) and write AV 3 OA_Temp_BMS or AV 4 OA_Hum_BMS.
How do I check these points on the real PREEVA Air Handler Controls CP-AHU D19 / D21 / D22 (BACnet MS/TP Option BHB8)?
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 Reznor BACnet points lists
- Packaged rooftop unit / DOAS controller
Reznor MAPS / MAPS III / MAPS IV IQ Controller, Options D15 / D16 / D17 / D18 (BACnet point list)
Reznor MAPS III units (from March 2010) and MAPS IV units with control option D15, D16, D17 or D18 and the IQ system controller (software 2.01), including the optional energy recovery module (ERM).
Also known as: MAPS III, MAPS IV, MAPSIII&IV-D15-D16-D17-D18-D19-D21, RCB, RDB, RDCB, RDDB, RECB, REDB, RCC, RDC, RDCC, RDDC, RECC, REDC, CP-MAPS-D15/D16/D17/D18, 254003R8, IQ Controller, IQ System Controller, D15, D16, D17, D18, MAPS ERM - Packaged rooftop unit / DOAS controller
Reznor MAPS III / MAPS IV Control Option D19 (BACnet point list)
Reznor MAPS III and MAPS IV modular air processing units (packaged DX rooftop units for high outside air) with control option D19.
Also known as: MAPS III, MAPS IV, MAPSIII&IV-D15-D16-D17-D18-D19-D21, RCB, RDB, RDCB, RDDB, RECB, REDB, RCC, RDC, RDCC, RDDC, RECC, REDC, CP-MAPSIII-D19, D303069, Option D19, D19 - Packaged rooftop unit / DOAS controller
Reznor MAPS III / MAPS IV Control Option D21 (BACnet point list)
Reznor MAPS III and MAPS IV modular air processing units (packaged DX rooftop units) with control option D21 (space temperature control).
Also known as: MAPS III, MAPS IV, MAPSIII&IV-D15-D16-D17-D18-D19-D21, RCB, RDB, RDCB, RDDB, RECB, REDB, RCC, RDC, RDCC, RDDC, RECC, REDC, CP-MAPSIII-D21, D303070, Option D21, D21 - Packaged rooftop unit controller
Reznor R7DA and Y Series Rooftop Controls, Options D19 / D21 / D22 / D23 (BACnet card BHB8 / BHB9)
Reznor R7DA packaged rooftop units and Y series packaged rooftop equipment with control option D19, D21, D22 or D23 and a BACnet MS/TP (BHB8) or BACnet IP/Ethernet (BHB9) card.
Also known as: R7DA, Reznor Y series, R7DA-Y-D19-D21-D22-D23, 1024315-C, CP-P125-R7DA-D19-D21-D22-D23, 1024315-B, D19, D21, D22, D23, BHB8, BHB9, P125 - Energy recovery / DOAS heat pump ventilation unit controller
Reznor ZQYRA Energy Recovery Ventilation Unit (BACnet MS/TP Option BHB8)
Discontinued Reznor ZQYRA ventilation units (energy recovery wheel with heat pump) fitted with the BACnet MS/TP option BHB8.
Also known as: ZQYRA, ZQYRA-IOM, 260414-A, BHB8, Reznor ZQYRA
Source: Control System Guide for Air Handlers - Options DG1, DG2, DG5, DG6, D12B-G, D19, D21 and D22 for discontinued PREEVA models · PREEVA-CONTROLS (06-26) REV-A · rev. 2026-06. Object names, instances and units are reproduced as published; descriptions are our own.