Make-up air heater controller · BACnet points list

Cambridge Air Solutions BACnet Controller - MAU BACnet points list

Updated 28 October 2026

Short answer

Cambridge's BACnet Controller is a BTL-listed, programmable MS/TP controller mounted in the heater that runs the fan and burner and gives a BAS access to its points. The object list is mostly multistate values (statuses, commands, HOA, modes, alarms) and analog values (temperatures, setpoints, delays, runtimes), with four binary values for runtime/cycle-count resets. Operating mode (unit heat, make-up air, make-up air with reset, summer vent, off) is selected with the Normal and Override Mode MVs.

This page lists 77 BACnet objects for the Cambridge Air Solutions BACnet Controller - MAU — 42 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from Cambridge Air Solutions’s own free documentation, linked below.

Manufacturer: Cambridge Air Solutions
Model: BACnet Controller - MAU
Equipment: Make-up air heater controller
Equipment type: Rooftop units, AHUs & DOAS
BACnet objects: 77 (42 writable)
Transport: BACnet MS/TP
Firmware: 4.0.3.0012
Also known as: Cambridge MAU controller, Cambridge BACnet Controller, Cambridge heater BACnet, MAU Technical Manual 4.0.3.0012
Source document: Operating Instructions - BACnet Controller - MAU (BACnet Controller MAU Technical Manual) · Version 4.0.3.0012 · rev. 2022-11-30

Download CSV 77 rows Download EDE B.I.G.-EU JSON Manufacturer PDF ↗ Download Easy BACnet Mobile App Google Play

BMS integration notes: Cambridge Air Solutions BACnet Controller - MAU

Integration in brief

Enable the unit with MV-3011 Unit Enable Mode, choose the operating mode with MV-50052 Normal Mode (MV-50053 Override Mode for the alternate mode) and command occupancy with MV-3021 Occupancy Override or the controller's own schedule. Adjust the zone and discharge setpoints, read MV-3001 Unit Status, the burner/fan status MVs and the fault MVs, and reset faults with MV-50058. The controller runs stand-alone on its defaults (unit heater mode, 160°F discharge, 65°F zone) if the network is lost, provided a zone sensor is connected.

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
MV 3011	Unit Enable Mode	Shutdown / enable	Write
MV 3021	Occupancy Override	Occupied / unoccupied / standby from the BAS	Write
MV 50052	Normal Mode	Unit heat, make-up air, summer vent or off	Write
AV 3037	Discharge Air Set Point – Makeup Air Mode	Discharge setpoint in make-up air mode	Write
AV 3017	Occupied Zone Heating Set Point	Zone temp the burner heats to when occupied	Write
MV 50058	Reset Unit Fault	Network fault reset	Write
MV 3001	Unit Status	Heating / satisfied / cooling / sensor unreliable	Read
AV 3011	Effective Discharge Air Temperature	Supply air temp leaving the unit, °F	Read
MV 3018	Burner Status	Burner proven on	Read
MV 50056	Burner Fault	Burner alarm	Read

Enable & remote start

MV-3011 Unit Enable Mode (1=Shutdown, 2=Enable). Fan and burner Hand/Off/Auto overrides are MV-50050 Supply Fan HOA and MV-11 Burner HOA; leave them in Auto (3) for normal control.

Sensors & values from the BMS

Network values can replace the wired sensors: AV-3038 Network Override Outdoor Air Temperature and AV-3045 Network Override Zone Temperature. MV-50064 ZN-T Remote Setpoint Enable selects no remote setpoint, hardware only, network only, or network with hardware backup. The manual gives no timeout for these.

Network setup

MS/TP only, up to 76.8 kbaud; MAC address 4-127 (default 4), set from the local display (Controller > Network) or a MAP gateway (AV-3003).
Baud rate defaults to Auto (follows the bus supervisor); the manual suggests 38400 when used with a Smart Building Hub.
Device Object ID (AV-3004) must be unique; BACnet Encoding Type must match the rest of the network.
Disconnect from the bus while changing network settings and cycle power afterwards.
An EOL terminator is needed when the controller is at either end of the MS/TP trunk.

Watch out for

The heating lockout (AV-3010) stops the burner whenever outdoor temperature is above it, even with a heating call.
In summer vent mode with SF Bypass = No, the fan will not run if outdoor temperature is above zone temperature.
Continuous Fan Operation in Occupied (MV-50065) decides whether the fan keeps running when the zone is satisfied in the reset & on/off mode.
Some faults also need a reset from the local display (Commissioning > Overrides > Unit Reset) or MV-50058.

Cambridge Air Solutions BACnet Controller - MAU 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.

77 of 77 shown

Type

AnalogBinaryMulti-state

Access

Units

Show

Cambridge Air Solutions BACnet Controller - MAU BACnet Points List
			Description			States
AV	3032	Supply Fan Output (optional)	Hardware point AO:2	%	Read
AV	3039	Filter pressure (optional)	Hardware point AI:5	in. w.c.	Read
MV	50051	Filter status (optional)	Hardware point BI:7		Read	0=Normal, 1=Alarm
MV	50055	Mode Switch (optional)	Hardware point BI:4		Read	0=Normal, 1=Override
BV	0	Burner Runtime Reset			Write	0=Off, 1=Reset
BV	1	Burner Cycle Count Reset			Write	0=Off, 1=Reset
BV	2	Supply Fan Runtime Reset			Write	0=Off, 1=Reset
BV	3	Supply Fan Cycle Count Reset			Write	0=Off, 1=Reset
MV	11	Burner HOA			Write	1=Hand, 2=Off, 3=Auto
MV	1577	Burner Modulation Mode			Write	1=Auto, 2=Manual
MVmin	3001	Unit Status			Read	1=Heating, 2=Satisfied, 3=Cooling, 4=Temperature Unreliable
MV	3006	Units			Write	1=IP, 2=SI
MV	3007	FCB Baud Rate			Write	1=Auto, 2=1200, 3=9600, 4=19200, 5=38400, 6=76800
MV	3008	Operating Baud Rate	Baud rate in use (see FCB Baud Rate states)		Read
MV	3009	PID Tuning Reset			Write	1=Off, 2=Reset
MV	3010	Occupancy Schedule	Occupancy schedule reference		Write
MVmin	3011	Unit Enable Mode			Write	1=Shutdown, 2=Enable
MV	3012	Effective Occupancy			Read	Occupied / Unoccupied
MV	3016	Supply Fan Status	Hardware point BI:2		Read	1=Off, 2=On
MV	3017	Unit Reset Fault	Hardware point BI:3		Read	1=Normal, 2=Alarm
MVmin	3018	Burner Status	Hardware point BI:1		Read	1=Off, 2=On
MV	3019	Burner Command	Hardware point BO:4		Read	1=Off, 2=On
MV	3020	Supply Fan Command	Hardware point BO:5		Read	1=Off, 2=On
MVmin	3021	Occupancy Override			Write	1=Occupied, 2=UnOccupied, 3=Bypass, 4=Standby, 5=Not Set
MV	3022	Emergency Heat Enabled			Read	1=Inactive, 2=Active
MV	50050	Supply Fan HOA			Write	1=Hand, 2=Off, 3=Auto
MVmin	50052	Normal Mode			Write	1=Unit Heat, 2=Makeup Air, 3=Makeup Air w/Reset, 4=Makeup Air w/Reset & On-Off, 5=Summer Vent, 6=Off
MV	50053	Override Mode			Write	1=Unit Heat, 2=Makeup Air, 3=Makeup Air w/Reset, 4=Makeup Air w/Reset & On-Off, 5=Summer Vent, 6=Off
MV	50054	Effective Mode			Read	1=Unit Heat, 2=Makeup Air, 3=Makeup Air w/Reset, 4=Makeup Air w/Reset & On-Off, 5=Summer Vent, 6=Off
MVmin	50056	Burner Fault			Read	1=Normal, 2=Alarm
MV	50057	Supply Fan Fault			Read	1=Normal, 2=Alarm
MVmin	50058	Reset Unit Fault			Write	1=Off, 2=Reset
MV	50059	Zone Temperature Sensor Failure			Read	1=Normal, 2=Alarm
MV	50060	Supply Air Temperature Sensor Failure			Read	1=Normal, 2=Alarm
MV	50061	Outdoor Air Temperature Sensor Failure			Read	1=Normal, 2=Alarm
MV	50062	DAT Low Temperature Alarm			Read	1=Normal, 2=Lockout
MV	50063	Heater Lockout Alarm			Read	1=Normal, 2=Lockout
MV	50064	ZN-T Remote Setpoint Enable			Write	1=No remote Setpoint, 2=Hardware Only, 3=Network Only, 4=Network with Hardware Backup
MV	50065	Continuous Fan Operation in Occupied			Write	1=No, 2=Yes
MV	50066	SF Bypass			Write	1=No, 2=Yes
AV	130	Zone Low Limit + Differential		°F	Write
AV	756	Discharge Air Set Point – Unit Heat Mode		°F	Read
AV	1382	Burner Modulation Set Point		%	Read
AV	3003	Device Address			Write
AV	3004	Device Object ID			Write
AV	3007	Zone Low Limit Set Point		°F	Write
AV	3008	Effective Cooling Set Point		°F	Read
AV	3009	Effective Heating Set Point		°F	Read
AV	3010	Heating Lockout Set Point		°F	Write
AVmin	3011	Effective Discharge Air Temperature	Hardware point AI:6	°F	Read
AV	3012	Discharge Air High Set Point		°F	Write
AV	3014	Discharge Air Low Set Point		°F	Write
AV	3015	Occupied Zone Cooling Set Point		°F	Write
AV	3016	Unoccupied Zone Cooling Set Point		°F	Write
AVmin	3017	Occupied Zone Heating Set Point		°F	Write
AV	3018	Unoccupied Zone Heating Set Point		°F	Write
AV	3019	Effective Outdoor Temperature	Hardware point AI:8	°F	Read
AV	3020	Effective Zone Temperature	Hardware point AI:9	°F	Read
AV	3026	Modulated Burner Control	Hardware point AO:1	%	Read
AV	3029	Application Software Version			Read
AV	3030	Effective Discharge Air Set Point		°F	Read
AV	3031	Supply Fan Speed (optional)		%	Write
AV	3033	Burner Runtime		hours	Read
AV	3034	Burner Cycle Count			Read
AV	3035	Supply Fan Runtime		hours	Read
AV	3036	Supply Fan Cycle Count			Read
AVmin	3037	Discharge Air Set Point – Makeup Air Mode		°F	Write
AV	3038	Network Override Outdoor Air Temperature		°F	Write
AV	3040	Filter Pressure Offset		in. w.c.	Write
AV	3041	Fan Fault Delay		seconds	Write
AV	3042	Burner Fault Delay		seconds	Write
AV	3043	Low Temperature Cutout Setpoint		°F	Write
AV	3044	Low Temperature Cutout Delay		seconds	Write
AV	3045	Network Override Zone Temperature		°F	Write
AV	3046	Zone Differential		°F	Write
AV	7018	AI1 Max Value		in. w.c.	Write
AV	7019	AI1 Output Range High		in. w.c.	Write

Integration notes

Optional points (mode switch, filter status/pressure, supply fan output and speed) exist only on units with those options.
Rows from the input/output tables point to the same MV/AV objects as the value tables; hardware terminal numbers are kept in the description.
The input/output tables show binary states as 0/1 while the MV table shows the same objects as 1/2; both are kept as printed.
MV-50052/50053/50054 share one mode state list in the source (merged cell).
Temperatures in °F by default (MV-3006 selects IP/SI); filter pressure in in. w.c.

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 BACnet Controller - MAU 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 Cambridge Air Solutions BACnet Controller - MAU

How many BACnet points does the Cambridge Air Solutions BACnet Controller - MAU have?

This list has 77 BACnet objects: 39 analog values, 4 binary values, 34 multi-state values. The exact set on a given unit depends on its firmware, installed options and configuration.

Which Cambridge Air Solutions BACnet Controller - MAU BACnet points are writable?

42 of the 77 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 Cambridge Air Solutions BACnet Controller - MAU BACnet documentation?

The source is Operating Instructions - BACnet Controller - MAU (BACnet Controller MAU Technical Manual) (Version 4.0.3.0012), revision 2022-11-30, published free by Cambridge Air Solutions at https://www.cambridge-eng.com/Portals/0/Operating%20Instructions%20v4_0_3_0012.pdf.

What are the minimum BACnet points to integrate the Cambridge Air Solutions BACnet Controller - MAU?

Start with MV 3011 Unit Enable Mode (Shutdown / enable); MV 3021 Occupancy Override (Occupied / unoccupied / standby from the BAS); MV 50052 Normal Mode (Unit heat, make-up air, summer vent or off); AV 3037 Discharge Air Set Point – Makeup Air Mode (Discharge setpoint in make-up air mode); AV 3017 Occupied Zone Heating Set Point (Zone temp the burner heats to when occupied); MV 50058 Reset Unit Fault (Network fault reset); MV 3001 Unit Status (Heating / satisfied / cooling / sensor unreliable); AV 3011 Effective Discharge Air Temperature (Supply air temp leaving the unit, °F); MV 3018 Burner Status (Burner proven on); MV 50056 Burner Fault (Burner alarm).

How do I enable BMS control of the Cambridge Air Solutions BACnet Controller - MAU?

MV-3011 Unit Enable Mode (1=Shutdown, 2=Enable). Fan and burner Hand/Off/Auto overrides are MV-50050 Supply Fan HOA and MV-11 Burner HOA; leave them in Auto (3) for normal control.

Can the BMS supply sensor values to the Cambridge Air Solutions BACnet Controller - MAU?

How do I check these points on the real BACnet Controller - MAU?

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: Operating Instructions - BACnet Controller - MAU (BACnet Controller MAU Technical Manual) · Version 4.0.3.0012 · rev. 2022-11-30. Object names, instances and units are reproduced as published; descriptions are our own.