VAV box reheat is active, damper is open to maximum ... - BetterBricks

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closed damper upstream, so check other VAV boxes fed by the same branch ducting to see if they have the same problems. Abnormal Operation: reheat not de-energized If your graph looks similar to the one below then your system is not operating as it should and the problem is unresolved. The reheat is energized at 50% once the damper rises above minimum setpoint. Airflow from the AHU to the pressure-sensor location is a problem since it cannot maintain static pressure. The damper has opened to 100% in an attempt to maintain the space setpoint. This chart depicts a reheat system that uses heating water. If the system has electric reheat, this graph shows at least 70 cfm/kW of heating capacity, otherwise the reheat would be at zero. Look for fan-speed restrictions, open duct-inspection ports, large leaks, or removed terminal units in a tenant renovation area. Checking above the ceiling for air noise is a good way to locate a duct leak. Produced by BetterBricks, the commercial initiative of the Northwest Energy Efficiency Alliance BOpTlsMstrPrb22.doc • 4
Abnormal operation: AHU SP setpoint not met Labor Skills Required to Find and Resolve the Problem • DDC system operator/programmer • Service mechanic Produced by BetterBricks, the commercial initiative of the Northwest Energy Efficiency Alliance BOpTlsMstrPrb22.doc • 5
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VAV box reheat is active, damper is open to maximum ... - BetterBricks

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