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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 • Cooling unit shutdown due to
an external command
• Temporarily remove the input 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.
• Valve/actuator malfunction • Fully open the valve.
• Application error • Contact Schneider Electric Technical Support.
• 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 • RACS and HACS modes only: Select the next-highest fan
speed setting. For example, change the fan speed setting
from Low to Med/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 5.4 m
(18 ft) lift and 18.3 m (60.0 ft) horizontal run.
• Leak in drain 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.
Fluid valve not
responsive
• Actuator not connected
properly
• Verify that the actuator is connected properly.
• Actuator and shaft not rotating
together
• Tighten the linkage screw on the actuator shaft.
• Rotary switch on the bottom of
the actuator is set incorrectly
• Confirm that the rotary switch is pointing toward the front of
the cooling unit.
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.