Economizer Fault
Table 10. Economizer cooling failure modes and system response
Outdoor Air Damper Fault Detection and Diagnostics (FDD)
The outdoor air damper fault will have two fault detection components, faults that are generated when operating in minimum ventilation mode and another set when the damper is being controlled by the economizer:
• FDD: Excessive Outdoor Air
In minimum ventilation mode and the damper feedback position is >10% of the damper
commanded value for 5 continuous minutes.
• FDD: Outdoor Air Damper Not Modulating
In minimum ventilation mode and the damper, feedback is <10% of the damper commanded
value for 5 continuous minutes.
• FDD: Unit Economizing When It Should Not
In economizer cooling mode and the damper, feedback is >10% of the damper commanded
value for 5 continuous minutes.
• FDD: Unit Not Economizing When It Should
In economizer cooling mode and the damper feedback is <10% of the damper commanded
value for 5 continuous minutes.
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WARNING:
Information in this article is intended for use by individuals possessing adequate backgrounds of electrical and mechanical experience and who comply with all federal, state, and local laws, rules, orders, or regulations related to the installation, service, or repair of a heating or central air conditioning product. Any attempt to install, service, or repair a heating or central air conditioning product may result in personal injury and/or property damage. The manufacturer or seller cannot be responsible for the interpretation of the information contained herein, nor can it assume any liability in connection with its use.