Sequence
Supply Fan Proving is active when the Supply Fan is commanded ON. The supply fan speed must be greater than 30 rpm for 40 continuous seconds. If the supply fan speed falls below 30 rpm, a supply fan failure diagnostic is generated, and the operation is stopped.
The following failures are derived either through direct data monitoring from the Modbus™ device, or through a combination of data monitoring and additional failure criteria.
| Failure | Failure Detection | Symbio 700 Response | Response Type |
|---|---|---|---|
| Diagnostic: ERM Supply Fan 1 Failure | If while the Supply Fan 1 ERM is requested to run, the ERM Actual Speed from the drive is set to < 30 RPM for 40 continuous seconds, this failure will be detected. | Diagnostic: Supply Fan 1 Failure will be set to “Active”. All unit functions will be shut down immediately. | Manual Reset |
| Diagnostic: ERM Supply Fan 2 Failure | If while the Supply Fan 2 ERM is requested to run, the ERM Actual Speed from the drive is set to < 30 RPM for 40 continuous seconds, this failure will be detected. | Diagnostic: Supply Fan 2 Failure will be set to “Active”. All unit functions will be shut down immediately. | Manual Reset |
| Diagnostic: ERM Supply Fan Locked Motor - 1 | Something has blocked the rotor from turning. (Motor Auto Reset) | Diagnostic: ERM Supply Fan Locked Motor - 1 will be set to “Active”. All unit functions will be shut down immediately. | Auto Reset |
| Diagnostic: ERM Supply Fan Locked Motor - 2 | Something has blocked the rotor from turning. (Motor Auto Reset) | Diagnostic: ERM Supply Fan Locked Motor - 2 will be set to “Active”. All unit functions will be shut down immediately. | Auto Reset |
| Diagnostic: ERM Supply Fan Motor Overheated - 1 | The motor thermocouples have reached a too-high temperature. (Motor Manual Reset) | Diagnostic: ERM Supply Fan Motor Overheated - 1 will be set to “Active”. All unit functions will be shut down immediately. | Auto Reset |
| Diagnostic: ERM Supply Fan Motor Overheated - 2 | The motor thermocouples have reached a too-high temperature. (Motor Manual Reset) | Diagnostic: ERM Supply Fan Motor Overheated - 2 will be set to “Active”. All unit functions will be shut down immediately. | Auto Reset |
| Diagnostic: ERM Supply Fan Power Mod Overheated - 1 | The Rectifier thermocouple has reached a too-high temperature. (Motor Manual Reset) | Diagnostic: ERM Supply Fan Power Mod Overheated - 1 will be set to “Active”. All unit functions will be shut down immediately. | Auto Reset |
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.