Damper left closed or not checked
Before blaming the unit, check damper position. A closed or unknown damper can make a diffuser look dead during TAB.
Watch out
- Do not randomly open, close, or reset dampers without knowing what type they are and who controls them.
Check
- Locate the volume/fire/smoke/control damper tied to the affected branch.
- Confirm whether it should be open, closed, locked, or controlled.
- Verify handle/actuator position is reachable and visible.
- Do not reset fire/smoke dampers without direction.
- Tell foreman/TAB what you found before changing anything.
Steps
- Locate the volume/fire/smoke/control damper tied to the affected branch.
- Confirm whether it should be open, closed, locked, or controlled.
- Verify handle/actuator position is reachable and visible.
- Do not reset fire/smoke dampers without direction.
- Tell foreman/TAB what you found before changing anything.
Say this to your foreman
The damper serving [room/device] appears [closed/unknown]. Are we allowed to open/adjust this, or does it need foreman/TAB/fire-damper verification?
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