Is Your BAS Actually Automated?
Most commercial buildings with a Building Automation System (BAS) are automated in theory.
But are they still automated in practice?
A BAS may be online. Operators may be able to see temperatures and equipment status. Alarms may be coming in. Equipment may be starting every morning.
That does not necessarily mean the building is operating automatically—or efficiently.
Over time, buildings change. Occupancy changes. Equipment is replaced. Schedules are adjusted. Service technicians create overrides. Sensors fail. Control sequences are modified. Temporary fixes sometimes become permanent.
Little by little, the way a building actually operates can drift away from the way it was intended to operate.
For owners and facility teams concerned about utility spend, that leads to an important question:
Is your BAS actually automating your building, or has your team gradually become the automation?
Start With the Basics: Does the Building Shut Down?
One of the simplest ways to waste energy is to operate equipment when the building does not need it.
That sounds obvious, but it is worth verifying.
Operating schedules established years ago may no longer match how a facility is used today. Temporary changes may never have been changed back. Holiday schedules may be outdated. Pumps, exhaust fans, air-handling units, or other equipment may remain enabled long after occupants leave.
A BAS should help match building operation to actual need.
- Occupied and unoccupied schedules
- Start and stop times
- Holiday schedules
- After-hours operation
- Equipment that remains enabled overnight
- Optimum start and stop strategies where appropriate
- HVAC and lighting schedules where systems are integrated
The question is not whether a schedule exists on the BAS screen.
The question is whether the building is actually following it.
What Is in Override?
Overrides are a normal part of operating a building.
A technician may override a valve, damper, fan, setpoint, or piece of equipment while troubleshooting a problem. An operator may temporarily change a schedule to accommodate an event or occupant request.
The problem occurs when temporary becomes permanent.
Months later, the original issue may be forgotten, but the override remains.
That can result in equipment running longer than necessary, reset strategies being bypassed, valves or dampers remaining in fixed positions, or systems no longer responding automatically to changing building conditions.
An Energy Performance review should ask:
- What is currently in override?
- How long has it been overridden?
- Why was the override originally made?
- Is the underlying problem still present?
- Can automatic operation be restored?
A BAS cannot optimize a building if significant portions of the system are permanently being operated manually.
Is the Equipment Actually Doing What the BAS Is Telling It to Do?
This is where looking only at the BAS screen can be misleading.
The BAS may command a damper open, but did it actually open?
It may command a control valve closed, but is heating or chilled water still flowing?
It may reduce fan speed, but is the Variable Frequency Drive responding correctly?
A sensor may display a temperature, pressure, or humidity value, but is that value accurate?
Good Energy Performance requires verifying both sides of the equation:
What is the BAS commanding, and what is actually happening in the building?
- Valves and dampers
- Actuators
- Sensors
- Variable Frequency Drives
- Equipment safeties and interlocks
- Airflow and waterflow
- Heating and cooling operation
- Equipment staging
- Feedback points and equipment status
A sophisticated control sequence cannot overcome a failed damper, inaccurate sensor, leaking valve, or equipment that does not respond properly.
Are the Sequences Still Optimizing the Building?
A BAS should do more than turn equipment on and off.
Good controls should adjust building operation as conditions change.
Depending on the facility and equipment, that may include strategies such as:
- Supply-air-temperature reset
- Static-pressure reset
- Chilled-water and hot-water reset
- Boiler and chiller staging
- Pump sequencing
- Economizer control
- Demand-based ventilation
- Appropriate heating and cooling deadbands
- Reduction of unnecessary simultaneous heating and cooling
The basic concept is simple:
Do not operate equipment harder than necessary to meet the building’s actual needs.
Older BAS systems may never have included these strategies. In other buildings, they may have been programmed originally but disabled or modified over time.
Energy Performance is not just about having sophisticated sequences available. It is about making sure they are actually being used and are still appropriate for the building.
Recommissioning and TAB Can Be Part of the Answer
When building operation has drifted, correcting programming alone may not be enough.
Recommissioning can help verify that equipment, controls, and sequences are operating together as intended.
Testing, Adjusting, and Balancing (TAB) may also be needed when airflow or hydronic performance is preventing the control system from achieving the intended results.
For example, a BAS can reset duct static pressure based on demand, but the strategy will not produce the intended result if airflow is badly out of balance.
The same applies to heating and cooling water systems.
The BAS provides the control and visibility. Recommissioning, TAB, and field verification help ensure the building actually responds the way the BAS expects it to.
What Ongoing BAS Service Support Should Include
Correcting Energy Performance once is useful.
Keeping the BAS performing over time is more valuable.
A BAS does not remain healthy automatically. Controllers age. Sensors drift. Network conditions change. Devices lose communication. Overrides accumulate. Equipment is replaced. Building use continues to evolve.
Ongoing BAS service support should include more than responding when something breaks.
It should periodically review:
- Whether controllers and devices are communicating reliably
- Whether BAS network communication is stable
- Whether important controllers or points are offline
- Whether sensors and critical points are reporting reasonable values
- Whether equipment is actually responding to BAS commands
- Whether operating schedules still match current building use
- Whether overrides are being reviewed and removed when appropriate
- Whether recurring alarms are being investigated instead of simply acknowledged
- Whether control sequences and reset strategies continue to operate as intended
- Whether current system backups and databases are available
- Whether building or equipment changes have created new control issues
The objective is not simply to confirm that the BAS is online.
The objective is to confirm that the BAS is healthy and still operating the building the way it is supposed to.
Use the Data to Find What Changed
One of the most valuable things a BAS can provide is information about how the building is operating over time.
Trends, runtime information, alarms, metering, and Energy Dashboards can help facility teams identify:
- Equipment running outside normal hours
- Unexpected peaks in energy use
- Systems that are not responding to load
- Changes in equipment runtime
- Repeated Comfort problems
- Abnormal operating conditions
- Opportunities to improve sequences or scheduling
But data alone does not improve a building.
The value comes from using the information to identify an issue, correct it, and then confirm that the change produced the intended result.
A useful Building Performance cycle is:
Identify → Correct → Recommission → Measure Again
Better Energy Performance Starts With Better Building Operation
Reducing utility spend does not always require starting with a major capital project.
Sometimes the first opportunity is making sure the BAS and the equipment you already own are doing what they were designed to do.
Ask:
- Is the building shutting down when it should?
- What is currently in override?
- Is equipment responding to BAS commands?
- Are sensors and control points reliable?
- Are the sequences actually optimizing operation?
- Are controllers and devices communicating reliably?
- Has anyone recently looked at how the entire building is operating—not just whether the BAS is online?
A Building Automation System should do more than display what is happening.
It should actively help the building operate better.
And when it does, better Energy Performance, improved Comfort, greater Reliability, and lower operating costs can follow.
Ready to Take a Closer Look?
A Building Performance Assessment can help identify BAS and operational issues that may be affecting Energy Performance and utility spend.
Building Performance Assessment
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