Installation manual

InRow RD Fluid Cooled Operation and Maintenance40
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 shutdown
due to an external
command
• Temporarily remove the user contact cable, if it is connected.
• Single fan fails to start • Replace the fan.
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.
• Valve/actuator
malfunction
• Fully open the valve.
• Application error • For assistance, contact APC at a number on the back cover of
this manual.
• Entering water
temperature is too high
• Verify that the temperature of the cooling unit water supply is
within the specified range.
• Heat load is too far away • Place the cooling unit closer to the heat load.
Water carryover • Improper fan speed
selected
• This applies to RACS and HACS modes only. Select the next
highest fan speed setting. For example, change the fan speed
setting from Med/Low to Low.
• Inlet water temperature is
too low
• Verify that the temperature of the inlet water is within the
specified range.
• Room humidity is too
high/low
• Improve room sealing.
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.