American Power Conversion Central Air Conditioning System Displayed Alarm Message Action Required

Operation: Respond to Alarms

Displayed Alarm Message	Action Required
Remote Sensor Added	• Check the CAN bus connection to the remote sensors.
	• Disregard if you added the remote sensor.
Replace Steam Cylinder	• Replace the steam cylinder.
	• Clean the steam cylinder (if your System is equipped with reusable
	humidifier cylinders).
Return Sensor Fail	• Verify that there is a proper CAN connection between the sensors and the
	user interface box.
	• Replace the sensor assembly.
Secondary Sensors Failed	• Verify that there is a proper CAN connection between the sensors and the
	user interface box.
	• Replace the sensor assembly.
Smoke Detected	• Follow the appropriate facility emergency protocol. NOTE: The purpose of
	the smoke sensor is to warn you of possible equipment damage. It is NOT
	intended to provide a smoke alarm system to protect the facility and the lives
	of its occupants.
	• Confirm the wiring connections are secured to the wiring harness.
	• Ensure smoke head and sub-base are properly attached.
	• Ensure that there is not dirt or dust on the smoke head. Use pressurized air to
	clean the smoke head chamber.
	• Replace the smoke detector.
Supply Sensor Fail	• Verify that there is a proper CAN connection between the sensors and the
	user interface box.
	• Replace the sensor assembly.
Supply Temperature High	• Ensure that the alarm delay is not set too low. The delay should be long
	enough to allow the Module to control the temperature after start-up.
	• Verify that the supply air temperature alarm threshold is set above the cool
	and reheat setpoints.
	• Verify that there is proper airflow through the Module (check the pressure
	drop across the evaporator coil).
	• Ensure that the cool mode is enabled.
	• Ensure that the cool mode is not disabled because of an active user-defined
	input mapped to nonessential lockout.
Supply Temperature Low	• Ensure that the alarm delay is not set too low. The delay should be long
	enough to allow the Module to control the temperature after start-up.
	• Verify that the Module is configured and equipped for the reheat mode.
	• Ensure that the supply air temperature alarm threshold is set below the reheat
	and cool setpoints.
	• Ensure that the reheat mode is enabled.
	• Ensure that the reheat mode is not disabled because of an active user-defined
	input mapped to nonessential lockout.
	• Verify that there is proper airflow through the Module (check the pressure
	drop across the evaporator coil).
System Comm Lost	• Check that the System is receiving power.
	• Check the external CAN bus connections.
	• Check the System ID DIP switch settings of every Main Module in the
	Group. Each Main Module must have a unique address. See the Installation
	Manual for the correct DIP switch settings.

44 NetworkAIR IR Operation, Maintenance, and Troubleshooting