Operation: Respond to Alarms

Alarm messages and suggested actions

Displayed Alarm Message

Action Required

 

 

Air Block Interlock Open

• Verify that the air block is in place.

 

• Confirm that the wiring connections for the air block interlock are secure.

 

 

Air Filter Clogged

• Verify the condition of the return air filters, and replace them if required.

 

• Check the pressure drop across the filters by reviewing the System status.

 

• Ensure that the pressure-sensing tubing is properly connected to the sensor.

 

• Verify that the ends of the pressure-sensing tubing are not blocked or placed

 

incorrectly.

 

• Verify that the correct filter is selected in the System Options menu (Path:

 

Main > Setup > System > System Config > System Options).

 

 

Airflow Low

• Check the pressure drop across the filters, and replace the filters if necessary.

 

• Check the pressure drop across the evaporator coil on the pressures screen of

 

the display interface (Path: Main Menu > Status > [Module] > Pressures).

 

The reading should be close to the recommended coil differential pressure

 

drops indicated in the table “Coil Differential Pressure Values” on page 17. If

 

the reading is too low based on Module size and options installed, adjust the

 

blower speed.

 

• Verify the proper operation of the Variable Frequency Drive (VFD) and

 

blower motors.

 

• Verify that the VFD overload alarm is not active.

 

• Ensure that any field-installed dampers in the discharge duct are open.

 

• Verify that the Mode Delay is not too short. If the Mode Delay is too short,

 

the Airflow Low alarm occurs after start-up and resolves itself after a few

 

minutes.

 

 

Backup is Load Sharing

• A backup System is contributing to meet the room load.

 

• No action required. The backup will return to idle when the demand falls.

 

 

Backup System Idle

• A primary System has come back online after a failover event.

 

• No action required.

 

 

Backup System Online

• Indicates that a System failover has occurred. The backup System has come

 

online due to another online System that either failed or was commanded off.

 

A System Comm Loss is considered to be a System failure if the Comm

 

Loss Failover configuration setting is Yes (the default setting).

 

• Check the System’s event log to determine the cause of the System failure.

 

 

Blower 1 Requires Maintenance

• Verify operation of Blower 1 and perform preventive maintenance.

 

• Reset the maintenance alarm for Blower 1 on the display interface.

 

 

Blower 2 Requires Maintenance

• Verify operation of Blower 2 and perform preventive maintenance.

 

• Reset the maintenance alarm for Blower 2 on the display interface.

 

 

Condensate Pump Fail

• Verify that the condensate pump circuit breaker has not been tripped.

 

• Ensure that the wiring between the float switch for the condensate pump and

 

the controller is secure.

 

• Confirm that the condensate removal lines are free of debris and are

 

unobstructed.

 

• Confirm the line voltage at the condensate pump.

 

• Ensure that the condensate float switch is moving freely and does not bind.

 

• Confirm that the condensate pump reservoir is clean and free of debris.

 

• Replace the condensate pump.

 

 

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American Power Conversion Central Air Conditioning System manual Alarm messages and suggested actions
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Central Air Conditioning System specifications

American Power Conversion (APC) is renowned for delivering innovative solutions in the realm of power management, but its contributions don't stop there. The company has also made significant advancements in central air conditioning systems. Featuring cutting-edge technologies and energy-efficient designs, their HVAC systems are tailored to meet modern needs while ensuring comfort and sustainability.

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