APC ACRD500 Installation Manual download pdf (Page 54)

InRow RD Operation and Maintenance46

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 farn 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 • Contact APC at a number located on the rear 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.

• 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 3.5 m

(11.5 ft) lift and 18.0 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.

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.

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APC ACRD500 Installation Manual Page 54

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