APC ACRD100 Fan User Manual


 
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
• 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
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.
• 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.