Stationary Engineer how-to
How to Test a Low-Water Cutoff
This safety device prevents boiler explosions.
Quick answer
This safety device prevents boiler explosions. In short: follow; notify; open, then complete the remaining steps below.
Step by step
Follow the manufacturer and site procedure.
Notify others.
Open the blowdown valve to drop the water level.
Confirm the burner shuts off.
Close the valve and restore water.
Log the test.
Safety reminders for stationary engineers
- Never bypass boiler safety devices
- Follow lockout/tagout
- Wear hearing and heat protection
- Handle refrigerants and chemicals safely
Key terms
Boiler · Chiller · BAS · Setpoint · Low-water cutoff · Safety valve: see the full stationary engineer glossary.