InRow RD 10 kW Air Cooled Operation and Maintenance44
Troubleshooting

Problem Possible Cause Corrective Action

Controls erratic or
inoperative
•Inlet temperature to cooling
unit is higher than rated
maximum temperature
•Red uce the load or add additional cooling equipment.
Fans fail to start •Power supplies are not
operating properly
•Co nfirm 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.
•Failed power supply •Replace the pow er supply if the LED is red.
•Co oling unit shutd own due to
an external command
•Temporarily remove the user contact cable, if it is connected.
•Sin gle fan fails to start •Verify that the fan circuit breaker is ON.
Cooling unit cannot
obtain setpoint
•Improper placement of remote
temperature sensor
•Verify that the remote temperature sensor is properly located
in the cold aisle.
•Dirty filter •Clean the filter.
•Dirty coil •Clean the coil.
•A pplication 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 onl y. Select the next highest fan
speed setting. For example, change the fan speed setting from
Low to Med/Low.
Temperature control
not tight enough
•Improper placement of remote
temperature sensor
•Verify that the remote temperature sensor is properly located
in the cold aisle.
Water on outside of
cooling unit
•Co ndensate drain hose is not
connected or not properly
routed outside the cooling unit
•Verify that the condensate drain hose is properly connected to
the pump and properly routed outside of 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.
•Co oling unit not leveled
properly
•A djust the leveling feet of the cooling unit.
•Damaged piping insulation •Identify d amaged area and repair the insulation.
Display interface not
operational but
cooling unit operates
•Display interface not
connected properly
•Verify that the display interface cable is connected properly.
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)
•Ext ernal monitoring equipment
is not receiving power or is not
functioning properly
•Co nfirm that power, if required, is being supplied to the
external equipment.
•If th e 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.