Blog Details

BAS Programming Tip: Don’t Forget Water Flush Mode

September 1, 2025

In Building Automation Systems (BAS), we often focus on temperature control, energy optimization, and occupancy strategies — but what about water stagnation in our terminal units?

Introducing a Water Flush Mode for cooling and heating coils can significantly improve your system’s health and compliance.

💡 Why It's Important:When CHW or HW coils sit idle for days or weeks (especially during seasonal transitions), stagnant water can lead to:
🦠 Microbial growth (including Legionella)
⚙️ Corrosion and scaling
🧊 Poor coil performance on startup

🔁 Flush Mode Logic:
✔️ Fully open coil valve (CHW or HW)
✔️ Circulate water for 5–15 minutes
✔️ Bypass temperature control logic
✔️ Run on a schedule or after 72+ hrs idle

📘 What ASHRAE Says:
🔹 ASHRAE Standard 188: Requires a Water Management Program (WMP) for Legionella risk
🔹 ASHRAE Guideline 12: Recommends flushing coils and stagnant piping regularly
🔹 ASHRAE 62.1: Encourages maintaining systems for optimal IAQ
“Flush unused piping or coils with fresh water regularly to prevent stagnation.” – ASHRAE Guideline 12

🛠️ Pro Tip:
Build flush logic into your BAS for both cooling and heating coils and log it! It’s a small step with a big impact on system longevity and safety.

👉 Are you already using flush mode in your HVAC programming? Would love to hear how your teams implement it!

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