American Power Conversion FM, DX Displayed Alarm Message, Action Required, Supply Humidity High

Displayed Alarm Message	Action Required
Supply Humidity High	• Verify that the suction pressure is not below 58 psig (400 kPa).
	• Ensure that the alarm delay is not set too low. The delay should be long
	enough to allow the Module to control the humitity after start-up.
	• Ensure the alarm threshold for the humidity of the supply air is set above the
	humidify and dehumidify setpoints.
	• Verify that there is proper airflow through the Module. (Check the pressure
	drop across the evaporator coil.)
	• Check the capacity output of the humidifier and reduce it if required.
	• Ensure that there is a proper vapor barrier within the conditioned space.
	• Verify that the Module is configured and equipped for the dehumidify mode.
	• Ensure the dehumidify mode is enabled.
	• Ensure the dehumidify mode is not disabled because of an active custome
	input mapped to a nonessential lockout.
Supply Humidity Low	• Ensure the alarm delay is not set too low. The delay should be long enough to
	allow the Module to control the humidity after start-up.
	• Ensure the alarm threshold for the humidity of the supply air is set below the
	humidify and dehumidify setpoints.
	• Check the capacity output of the humidifier and increase it if required.
	• Ensure there is a proper vapor barrier within the conditioned space.
	• Verify the Module is configured and equipped for the humidify mode.
	• Ensure the jumidify mode is enabled.
	• Ensure the humidify mode is not disabled because of an active customer
	input mapped to a nonessential lockout.
Supply Sensor Fail	• Verify that there is a proper CAN connection between the sensors and the
	user interface box.
	• Check the connections of the 25 pin serial communication cable from the
	main controller board to the customer 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 customer 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 customer
	input mapped to nonessential lockout.
	• Verify that there is proper airflow through the Module (check the pressure
	drop across the evaporator coil).

NetworkAIR FM DX 60 Hz Operation, Maintenance, and Troubleshooting 59