Constant Volume Controller - Verasys - LIT-12013648 - LC-SBH200-0 - Building automation software - Verasys System - 4.0

Verasys Alarms Summary Technical Bulletin

Brand
Verasys
Product name
Verasys System
Document type
Technical Bulletin
Document number
LIT-12013648
Version
4.0
Revision date
2021-04-01
Product status
Active
Language
English
Table 1. Constant Volume Controller Critical alarms summary
Description Cause
Low Temperature Alarm This alarm occurs when the low temperature alarm binary input triggers. If either heating or cooling output is proportional, the unit shuts down if it triggers. If the unit does not have proportional outputs and has an economizer, the system commands the economizer to close and the unit runs.
Emergency Shutdown Alarm This alarm occurs if you trigger the emergency shutdown object under the status menu.
Zone High Temperature Alarm If the zone temperature exceeds the cooling setpoint by 5°F this alarm occurs.
Zone Low Temperature Alarm If the zone temperature drops below the heating setpoint by 5°F this alarm occurs.
Supply Fan Fault If you add a supply fan status sensor and the commanded value of the fan does not match the binary input for fan status, this alarm occurs.
Unit in Purge Mode If either the emergency mode or binary input triggers a purge, this alarm occurs and the unit opens the dampers to 100 percent.
Table 2. Constant Volume Controller Service Priority alarms summary
Description Cause
Heating Ineffective Alarm This alarm occurs if the heat cool diagnostics are set to True and you have a supply air temperature sensor. If you request heating and the temperature does not rise by a certain amount in a specific period of time an alarm occurs.
Cooling Ineffective Alarm This alarm occurs if the heat cool diagnostics are set to True and you have a supply air temperature sensor. If you request cooling and the temperature does not fall by an expected amount in a defined period of time, an alarm occurs.
Zone Temperature Sensor Failure This alarm occurs if you connect a zone temperature sensor and it receives a reliable input that suddenly disconnects.
Note: If you connect the sensor by mistake, you can trigger the relearn system input from the Details menu on the Sensors section.
Return Air Temperature Sensor Failure This alarm occurs if you connect a return air temperature sensor and receive a reliable input that suddenly disconnects.
Note: Ifyou connect the sensor by mistake, you can trigger the relearn system input from the Details menu on the Sensors section.
Supply Air Temperature Sensor Failure This alarm occurs if a supply air temperature connects and receives a reliable input that suddenly disconnects.
Note: If you connect the sensor by mistake, you can trigger the relearn system input from the Details menu on the Sensors section.
Outside Air Temperature Sensor Failure This alarm occurs if an outside air temperature sensor connects and receives a reliable input that input suddenly disconnects.
Note: If you connect the sensor by mistake, you can trigger the relearn system input from the Details menu on the Sensors section.
Mixed Air Temperature Sensor Failure This alarm occurs if a mixed air temperature sensor is connected and receives a reliable input that suddenly disconnects.
Note: If you connect the sensor by mistake, you can trigger the relearn system input from the Details menu on the Sensors section.
Air Temperature Sensor Fault This alarm occurs when you enable the economizer fault detection and the mixed air or outside air temperature sensor becomes unreliable.
Damper Modulation Fault This alarm occurs when you enable the economizer fault detection and the difference between the Economizer Damper % Command and the Economizer Damper position is greater than the Damper Position error.
Econ Excessive Outside Air This alarm occurs when you enable the Economizer fault detection and the Economizer Damper position feedback is higher than the Minimum Position by more than the Damper Min Pos Fault Tolerance.This check occurs when the mixed air damper is at its minimum position or fully closes.
Econ Operational Fault This alarm occurs when you enable the economizer fault detection and Economizer Damper position feedback is higher than the minimum position plus the Damper Min Position Fault Tolerance. This check occurs when the mixed air damper is at its minimum position.
Econ Not Operational Fault This alarm occurs when you enable the economizer fault detection and Economizer Damper Position feedback is less than the minimum position plus the Damper Min Position Fault Tolerance. This check occurs when the economizer is in control.
Table 3. Constant Volume Controller Service alarms summary
Description Cause
Dirty Filter This alarm occurs when the binary input for the filter status triggers.
Fan Runtime Alarm This alarm occurs when the runtime of the fan exceeds the runtime limit.
Service Alarm This alarm occurs when the binary input for the service alarm triggers.