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Packaged rooftop unit / DOAS controller · BACnet points list
Reznor MAPS III / MAPS IV Control Option D21 (BACnet point list) BACnet points list
Updated 12 November 2026
MAPS III and MAPS IV units with control option D21 use a programmable system controller with an optional BMS card for BACnet MS/TP or BACnet IP/Ethernet. The D21 point list has 30 analog variables, 10 integer variables (AV 1001-1010) and 33 digital variables. Unlike D19 it adds space temperature and humidity setpoints, a state select and a BMS occupancy command.
This page lists 73 BACnet objects for the Reznor MAPS III / MAPS IV Control Option D21 (BACnet point list) — 19 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
- MAPS III / MAPS IV Control Option D21 (BACnet point list)
- Equipment
- Packaged rooftop unit / DOAS controller
- Equipment type
- Rooftop units, AHUs & DOAS
- BACnet objects
- 73 (19 writable)
- Transport
- BACnet MS/TP, BACnet IP
- Firmware
- Not stated
- Default device instance
- 77000
- 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
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 MAPS III / MAPS IV Control Option D21 (BACnet point list)
Set the BMS protocol, instance, baud and MAC in the controller's BMS Config screens. Set OccMode_Sel (AV 1007) to 2 and command occupancy with BV 23, choose the state with AV 1006 and write the space temperature setpoint. Monitor supply fan status, space and discharge temperatures 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 23 | Occupied_BMS | Occupancy command (needs AV 1007 = 2) | Write |
| AV 1007 | OccMode_Sel | Occupancy source: 0 schedule, 1 input, 2 BMS | Write |
| AV 1006 | State_Sel | Unit state: 2 auto, 3 cool, 4 heat, 5 off | Write |
| AV 26 | SpcTempSP | Space temperature setpoint, 65-85 °F | Write |
| BV 22 | Occupied | Occupied mode status | Read |
| BV 25 | SF_Sts | Supply fan status | Read |
| AV 25 | Spc_Temp | Space temperature | Read |
| AV 8 | DA_Temp | Discharge air temperature | Read |
| BV 1 | Alm_Rly_Cmd | General alarm relay on | Read |
Enable & remote start
AV 1006 State_Sel picks auto, cool, heat or off. Occupancy comes from the schedule, a digital input or the BMS, chosen with AV 1007 OccMode_Sel; with 2 = BMS, BV 23 Occupied_BMS sets occupancy.
Sensors & values from the BMS
Set BV 19 OA_Temp_Sel or BV 18 OA_Hum_Sel to 1 (BMS) and write AV 18 OA_Temp_BMS or AV 16 OA_Hum_BMS.
Network setup
- Default MS/TP instance 77000, baud 38400 (9600, 19200, 38400 or 76800), Max Masters 127, Max Info Frames 20.
- Settings: Service > BMS Config; set Protocol to BACnet MSTP or BACnet IP/Eth and Termconf PlugIn to Yes, then Instance, Baudrate and MAC.
Watch out for
- BV 23 has no effect unless AV 1007 is set to 2 (BMS).
- Static pressure integers are scaled x1000; divide by 1000 in the BMS.
Reznor MAPS III / MAPS IV Control Option D21 (BACnet point list) 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 | CC_Temp | Cooling Coil Discharge Air Temp | °F | Read | |
| AV | 2 | DA_NAClg_SP | Discharge Air Temp Neutral Cooling SP; range 50 to 100; default 70 | °F | Write | |
| AV | 3 | DA_NAHtg_SP | Discharge Air Temp Neutral Heating SP; range 50 to 140; default 70 | °F | Write | |
| AV | 4 | DA_SP | Discharge Air Temp Active SP | °F | Read | |
| AV | 5 | DA_SpcClg_SP | Discharge Air Temp Space Cooling SP; range 50 to 100; default 55 | °F | Write | |
| AV | 6 | DA_SpcHtCl_SP | Discharge Air Temp Space Heat Mode Cooling SP; range 50 to 100; default 55 | °F | Write | |
| AV | 7 | DA_SpcHtg_SP | Discharge Air Temp Space Heating Sp; range 50 to 140; default 90 | °F | Write | |
| AVmin | 8 | DA_Temp | Discharge Air Temp | °F | Read | |
| AV | 9 | Damper_Cmd | Damper Output Command; range 0 to 100 | % | Read | |
| AV | 10 | DhOADP_SP | Dehum OA Dew Point SP; range 50 to 100; default 58 | °F | Write | |
| AV | 11 | Ext_Dmpr_Cmd | External Unit Damper Command; range 0 to 100 | % | Read | |
| AV | 12 | HX1_Mod_Cmd | Heating 1 Modulation Command; range 0 to 100 | % | Read | |
| AV | 13 | HX2_Mod_Cmd | Heating 2 Modulation Command; range 0 to 100 | % | Read | |
| AV | 14 | MA_Temp | Mixed Air Temp | °F | Read | |
| AV | 15 | OA_Dew_Point | Outside Air Dew Point | °F | Read | |
| AV | 16 | OA_Hum_BMS | Outside air humidity from BMS; used when OA_Hum_Sel = 1 (BMS) | %RH | Write | |
| AV | 17 | OA_Hum_Raw | Outside Air Humidity | %RH | Read | |
| AV | 18 | OA_Temp_BMS | Outside air temp from BMS; used when OA_Temp_Sel = 1 (BMS) | °F | Write | |
| AV | 19 | OA_Temp_Raw | Outside Air Temp | °F | Read | |
| AV | 20 | OAChgOv_SP | OA Change Over SP; range 45 to 80; default 65 | °F | Write | |
| AV | 21 | RH_Mod_Out | Reheat Modulation Output %; range 0 to 100 | % | Read | |
| AV | 22 | SF_VFD_Cmd | Supply Fan VFD Command; range 0 to 100 | % | Read | |
| AV | 23 | SpcEffClgSP | Space Effective Cooling SP | °F | Read | |
| AV | 24 | SpcEffHtgSP | Space Effective Heating SP | °F | Read | |
| AVmin | 25 | Spc_Temp | Space Temp | °F | Read | |
| AVmin | 26 | SpcTempSP | Space Temp SP; range 65 to 85; default 72 | °F | Write | |
| AV | 27 | RA_Temp | Return Air Temperature | °F | Read | |
| AV | 28 | RA_Humidity | Return Air Humidity | %RH | Read | |
| AV | 29 | EA_Temp | Exhaust Air Temperature | °F | Read | |
| AV | 30 | EA_Humidity | Exhaust Air Humidity | %RH | Read | |
| AV | 1001 | Bldg_Pressure | Building Static Pressure | in. w.c. | Read | |
| AV | 1002 | Bldg_Press_SP | Building Static Pressure SP; range -500 to 500; default 100 | in. w.c. | Write | |
| AV | 1003 | Duct_Press_SP | Duct Static Pressure SP; range 0 to 2500; default 500 | in. w.c. | Write | |
| AV | 1004 | Spc_Hum | Space Humidity | %RH | Read | |
| AV | 1005 | SpcHumSP | Space Humidity SP; range 35 to 75; default 55 | %RH | Write | |
| AVmin | 1006 | State_Sel | State select; default 5 | Write | 2=AUTO, 3=COOL, 4=HEAT, 5=OFF | |
| AVmin | 1007 | OccMode_Sel | Occupied mode select; default 1 | Write | 0=Schedule, 1=Digital Input, 2=BMS | |
| AV | 1008 | Spc_CO2 | Space CO2 | ppm | Read | |
| AV | 1009 | SpcCO2SP | Space CO2 SP; range 0 to 2,000; default 1,000 | ppm | Write | |
| AV | 1010 | Duct_Pressure | Duct Static Pressure | in. w.c. | Read | |
| BVmin | 1 | Alm_Rly_Cmd | Unit General Alarm Relay Command | Read | 0=Off, 1=On | |
| BV | 2 | Comp_Stg1_Cmd | Compressor Stage 1 Command | Read | 0=Off, 1=On | |
| BV | 3 | Comp_Stg2_Cmd | Compressor Stage 2 Command | Read | 0=Off, 1=On | |
| BV | 4 | Comp_Stg3_Cmd | Compressor Stage 3 Command | Read | 0=Off, 1=On | |
| BV | 5 | Comp_Stg4_Cmd | Compressor Stage 4 Command | Read | 0=Off, 1=On | |
| BV | 6 | Ext_OCC | Occupied Mode Input | Read | 0=Off, 1=On | |
| BV | 7 | Ext_Switch_1 | External Damper Position Sw 1 | Read | 0=Off, 1=On | |
| BV | 8 | Ext_Switch_2 | External Damper Position Sw 2 | Read | 0=Off, 1=On | |
| BV | 9 | HX_Stg1_Cmd | Heating Stage 1 Command | Read | 0=Off, 1=On | |
| BV | 10 | HX_Stg2_Cmd | Heating Stage 2 Command | Read | 0=Off, 1=On | |
| BV | 11 | HX_Stg3_Cmd | Heating Stage 3 Command | Read | 0=Off, 1=On | |
| BV | 12 | HX_Stg4_Cmd | Heating Stage 4 Command | Read | 0=Off, 1=On | |
| BV | 13 | HX_Stg5_Cmd | Heating Stage 5 Command | Read | 0=Off, 1=On | |
| BV | 14 | HX_Stg6_Cmd | Heating Stage 6 Command | Read | 0=Off, 1=On | |
| BV | 15 | NA_Clg_Md | Neutral Air Cooling Mode | Read | 0=Off, 1=On | |
| BV | 16 | NA_Dehum_Md | Neutral Air Dehum Mode | Read | 0=Off, 1=On | |
| BV | 17 | NA_Htg_Md | Neutral Air Heating Mode | Read | 0=Off, 1=On | |
| BV | 18 | OA_Hum_Sel | Share OA Humidity from BMS (0=Probe 1=BMS); default Off | Write | 0=Off, 1=On | |
| BV | 19 | OA_Temp_Sel | Share OA Temp from BMS (0=Probe 1=BMS); default Off | Write | 0=Off, 1=On | |
| BV | 20 | Phase_Alarm | Phase Protection Alarm | Read | 0=Off, 1=On | |
| BV | 21 | Safety_Sts | Safety Input Status | Read | 0=Normal, 1=Alarm | |
| BVmin | 22 | Occupied | Occupied Mode Status | Read | 0=Off, 1=On | |
| BVmin | 23 | Occupied_BMS | Occupied mode from BMS; used when OccMode_Sel = 2; default Off | Write | 0=Off, 1=On | |
| BV | 24 | SF_Cmd | Supply Fan Command | Read | 0=Off, 1=On | |
| BVmin | 25 | SF_Sts | Supply Fan Status | Read | 0=Off, 1=On | |
| BV | 26 | Spc_Clg_Md | Space Cooling Mode | Read | 0=Off, 1=On | |
| BV | 27 | Spc_Dehum_Md | Space Dehum Mode | Read | 0=Off, 1=On | |
| BV | 28 | Spc_Htg_Md | Space Heating Mode | Read | 0=Off, 1=On | |
| BV | 29 | Filter_Sts | Main or ERV Dirty Filter Status | Read | 0=Off, 1=On | |
| BV | 30 | RH_Cmd | Reheat Compressor Command | Read | 0=Off, 1=On | |
| BV | 31 | Spc_HtgClg_Md | Space Heating Cooling Mode | Read | 0=Off, 1=On | |
| BV | 32 | Htr_1_Sts | Gas Heater 1 Status | Read | 0=Off, 1=On | |
| BV | 33 | Htr_2_Sts | Gas Heater 2 Status | Read | 0=Off, 1=On |
No points match these filters.
Object ID lookup: Reznor MAPS III / MAPS IV Control Option D21 (BACnet point list) point IDs by name
AV1CC_TempAV2DA_NAClg_SPAV3DA_NAHtg_SPAV4DA_SPAV5DA_SpcClg_SPAV6DA_SpcHtCl_SPAV7DA_SpcHtg_SPAV8DA_TempAV9Damper_CmdAV10DhOADP_SPAV11Ext_Dmpr_CmdAV12HX1_Mod_CmdAV13HX2_Mod_CmdAV14MA_TempAV15OA_Dew_PointAV16OA_Hum_BMSAV17OA_Hum_RawAV18OA_Temp_BMSAV19OA_Temp_RawAV20OAChgOv_SPAV21RH_Mod_OutAV22SF_VFD_CmdAV23SpcEffClgSPAV24SpcEffHtgSPAV25Spc_TempAV26SpcTempSPAV27RA_TempAV28RA_HumidityAV29EA_TempAV30EA_HumidityAV1001Bldg_PressureAV1002Bldg_Press_SPAV1003Duct_Press_SPAV1004Spc_HumAV1005SpcHumSPAV1006State_SelAV1007OccMode_SelAV1008Spc_CO2AV1009SpcCO2SPAV1010Duct_PressureBV1Alm_Rly_CmdBV2Comp_Stg1_CmdBV3Comp_Stg2_CmdBV4Comp_Stg3_CmdBV5Comp_Stg4_CmdBV6Ext_OCCBV7Ext_Switch_1BV8Ext_Switch_2BV9HX_Stg1_CmdBV10HX_Stg2_CmdBV11HX_Stg3_CmdBV12HX_Stg4_CmdBV13HX_Stg5_CmdBV14HX_Stg6_CmdBV15NA_Clg_MdBV16NA_Dehum_MdBV17NA_Htg_MdBV18OA_Hum_SelBV19OA_Temp_SelBV20Phase_AlarmBV21Safety_StsBV22OccupiedBV23Occupied_BMSBV24SF_CmdBV25SF_StsBV26Spc_Clg_MdBV27Spc_Dehum_MdBV28Spc_Htg_MdBV29Filter_StsBV30RH_CmdBV31Spc_HtgClg_MdBV32Htr_1_StsBV33Htr_2_Sts
Integration notes
- The point list is the CP-MAPSIII-D21 form (Doc No 303070) reprinted inside the combined MAPS III/IV controls guide (06-26).
- Analog variables are AV 1-30, integer variables AV 1001-1010 and digital variables BV 1-33.
- Building and duct static pressure points (AV 1001-1003, AV 1010) are integers; the guide says to divide them by 1000 in the BMS.
- There is no unit enable point in the D21 list; AV 1006 State_Sel = 5 turns the unit off.
- Source: Option D21 BACnet Point List, guide pages 148-149.
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 MAPS III / MAPS IV Control Option D21 (BACnet point list) 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 MAPS III / MAPS IV Control Option D21 (BACnet point list)
How many BACnet points does the Reznor MAPS III / MAPS IV Control Option D21 (BACnet point list) have?
This list has 73 BACnet objects: 40 analog values, 33 binary values. The exact set on a given unit depends on its firmware, installed options and configuration.
Which Reznor MAPS III / MAPS IV Control Option D21 (BACnet point list) BACnet points are writable?
19 of the 73 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 MAPS III / MAPS IV Control Option D21 (BACnet point list) BACnet documentation?
The source is Control System Guide for Modular Air Processing System Units, Options D15, D16, D17, D18, D19 and D21 (MAPS III and MAPS IV) (MAPSIII&IV-D15-D16-D17-D18-D19-D21 (06-26) REV-A), revision 2026-06, published free by Reznor at https://assets.reznorhvac.com/download/bcd1b330-3a4f-11f1-ae67-0016e1e579b9/MAPSIII%26IV-D15-D16-D17-D18-D19-D21%20%2806-26%29%20REV-A.pdf.
What are the minimum BACnet points to integrate the Reznor MAPS III / MAPS IV Control Option D21 (BACnet point list)?
Start with BV 23 Occupied_BMS (Occupancy command (needs AV 1007 = 2)); AV 1007 OccMode_Sel (Occupancy source: 0 schedule, 1 input, 2 BMS); AV 1006 State_Sel (Unit state: 2 auto, 3 cool, 4 heat, 5 off); AV 26 SpcTempSP (Space temperature setpoint, 65-85 °F); BV 22 Occupied (Occupied mode status); BV 25 SF_Sts (Supply fan status); AV 25 Spc_Temp (Space temperature); AV 8 DA_Temp (Discharge air temperature); BV 1 Alm_Rly_Cmd (General alarm relay on).
How do I enable BMS control of the Reznor MAPS III / MAPS IV Control Option D21 (BACnet point list)?
AV 1006 State_Sel picks auto, cool, heat or off. Occupancy comes from the schedule, a digital input or the BMS, chosen with AV 1007 OccMode_Sel; with 2 = BMS, BV 23 Occupied_BMS sets occupancy.
Can the BMS supply sensor values to the Reznor MAPS III / MAPS IV Control Option D21 (BACnet point list)?
Set BV 19 OA_Temp_Sel or BV 18 OA_Hum_Sel to 1 (BMS) and write AV 18 OA_Temp_BMS or AV 16 OA_Hum_BMS.
How do I check these points on the real MAPS III / MAPS IV Control Option D21 (BACnet point list)?
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 - Air handling unit / make-up air controller
Reznor PREEVA Air Handler Controls CP-AHU D19 / D21 / D22 (BACnet MS/TP Option BHB8)
Discontinued Reznor PREEVA air handlers (PDH, PEH, PXH, RDH, REH, RHH, RXH, SDH, SHH) with control option D19, D21 or D22 and the BACnet MS/TP communication card (option BHB8).
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 - 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 Modular Air Processing System Units, Options D15, D16, D17, D18, D19 and D21 (MAPS III and MAPS IV) · MAPSIII&IV-D15-D16-D17-D18-D19-D21 (06-26) REV-A · rev. 2026-06. Object names, instances and units are reproduced as published; descriptions are our own.