American Power Conversion DX 用户手册

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).