APC IN ROW RD ACRD101 - Manual (Page 52)

InRow RD 10 kW Air Cooled Operation and Maintenance 44
Troubleshooting
Problem Possible Cause Corrective Action
Controls erratic or
inoperative
• Inlet temperature to cooling
unit is higher than rated
maximum temperature
• Reduce the load or add additional cooling equipment.
Fans fail to start
• Power supplies are not
operating properly
• 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.
• Failed power supply • Replace the power supply if the LED is red.
• Cooling unit shutd own due to
an external command
• Temporarily remove the user contact cable, if it is connected.
• Single fan fails to start • Verify that the fan circuit breaker is O N .
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.
• 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
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
• Condensate 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.
• Cooling unit not leveled
properly
• Adjust the leveling feet of the cooling unit.
• Damaged piping insulation • Identify damaged 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)
• 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.