A fan coil condensate trap is dry or air-locked and the pan overflows
A condensate drain has to overcome unit pressure and maintain drainage. Prime/check the trap, venting, slope, and manufacturer trap detail before water damages ceilings or equipment.
The FCU/AHU at [tag] is overflowing because the condensate trap appears dry/air-locked. I checked trap, slope, and venting. Do you want the drain corrected per manufacturer trap detail?
Watch out
Do not assume a clean-looking condensate line will drain under fan pressure if the trap/vent logic is wrong.
Check
Check if water is standing in the pan while fan is running.
Verify trap depth/layout and vent/cleanout arrangement against manufacturer detail.
Prime the trap if required before commissioning.
Check slope, blockage, and drain termination.
Run the unit and confirm steady gravity drainage.
Steps
Check if water is standing in the pan while fan is running.
Verify trap depth/layout and vent/cleanout arrangement against manufacturer detail.
Prime the trap if required before commissioning.
Check slope, blockage, and drain termination.
Run the unit and confirm steady gravity drainage.
Say this to your foreman
The FCU/AHU at [tag] is overflowing because the condensate trap appears dry/air-locked. I checked trap, slope, and venting. Do you want the drain corrected per manufacturer trap detail?