American Power Conversion Central Air Conditioning System Problem, Possible Cause, Humidifier

Troubleshooting: Semi-Annual Preventive Maintenance

Problem	Possible Cause	Corrective Action
Humidifier	• Water supply is not on.	• Turn on the supply.
inoperative	• Electrical connections are	• Tighten all electrical connections.
	loose.
	• Humidifier fuse is open.	• Check for short circuits, and replace blown fuses.
	• Relative humidity is above	• No action needed.
	the setpoint.
Reheat elements	• Overheat switch is actuated.	• Reset and check for operation.
inoperative	• A fuse is open.	• Check for short circuit.
	• The thermostat is set too low.	• Adjust thermostat to required temperature.
	• The thermal fuse in the	• Replace thermal fuse.
	heater is open.
Water carry-over	• Insufficient air quantity over	• Check for correct airflow and clean filters.
	the cooling coil.
	• Dirty coil.	• Clean the coil.
	• Excessive airflow.	• Reduce airflow to specifications.
	• Blocked drain pan or trap.	• Clean the drain pan and trap.
Module is receiving	• Remote shutdown enabled.	• Disable remote shutdown.
power, but will not
operate

NetworkAIR IR Operation, Maintenance, and Troubleshooting 69