Troubleshooting

Problem	Possible Cause	Corrective Action

Controls erratic or	• Inlet temperature to cooling	• Reduce the load or add additional cooling equipment.
inoperative	unit is higher than rated
	maximum temperature

•Confirm that the power supplies are seated properly and fully engaged. This is indicated by a green LED.

•Confirm that the cooling unit is plugged in and is receiving power.

•Replace the power supply if the LED is red.

•Temporarily remove the user contact cable, if it is connected.

• Single fan fails to start

• Verify that the fan circuit breaker is ON.

Cooling unit cannot obtain setpoint

• Improper placement of remote	• Verify that the remote temperature sensor is properly located
temperature sensor	in the cold aisle.
• Dirty filter	• Clean the filter.
• Dirty coil	• Clean the coil.
• Application error	• For assistance, contact APC at a number on the back cover of
	this manual.

	• Heat load is too far away	• Place the cooling unit closer to the heat load.
Water carryover	• Improper fan speed selected	• RACS and HACS modes only. Select the next highest fan
		speed setting. For example, change the fan speed setting from
		Low to Med/Low.

Temperature control	• Improper placement of remote	• Verify that the remote temperature sensor is properly located
not tight enough	temperature sensor	in the cold aisle.

Water on outside of	• Condensate drain hose is not	• Verify that the condensate drain hose is properly connected to
cooling unit	connected or not properly	the pump and properly routed outside of the cooling unit.
	routed outside the cooling unit	• Verify that the condensate drain line does not exceed 4.9
		meters (16 feet) lift and 15.4 meters (50.0 feet) horizontal run.
	• Leak in piping system	• Locate and repair the leak.
	• Cooling unit not leveled	• Adjust the leveling feet of the cooling unit.
	properly
	• Damaged piping insulation	• Identify damaged area and repair the insulation.

Display interface not	• Display interface not	• Verify that the display interface cable is connected properly.
operational but	connected properly
cooling unit operates

Incorrect air pressure	• False filter clogs	• Verify that the ends of the clear plastic air tubes are not
		obstructed.
		• Verify that the clear plastic air tubes are connected to the
		controller.
		• Verify that the clear plastic air tubes are not pinched.

Alarms do not show up on monitoring equipment (Customer Output Contact)

•External monitoring equipment is not receiving power or is not functioning properly

•Confirm that power, if required, is being supplied to the external equipment.

•If the cooling unit (+12 V or +24 V) is providing power to the external equipment, verify that the external equipment is <50 mA.

•Test the external equipment by bypassing the output contact.

•Verify Customer Output Contact settings. See “Contacts” on page 17.

44	InRow RD 10 kW Air Cooled Operation and Maintenance

Problem