APC ACRC301S User's Guide download pdf (Page 49)

InfraStruXure InRow RC—Operation and Maintenance 43

Troubleshooting

Problem Possible Cause Corrective Action

Controls are erratic

or inoperative

• Inlet temperature to cooling

unit is higher than rated

maximum temperature

• Reduce the load or add additional cooling

equipment.

• cooling unit is not properly

tuned

• Tune the PIDs

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 inlet

temperature is higher than

rated maximum temperature

• Reduce the load or add additional cooling

equipment.

• cooling unit shutdown due to

an external command

• Temporarily remove the user input contact cable,

if it is connected.

• Single fan fails to start • Confirm that the fan is seated properly and fully

engaged.

• Replace the fan if it is faulty.

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.

• Isolation valve is closed or is

not open fully

• Fully open the valve.

• Application error • Contact APC Worldwide Customer Support 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.

• cooling unit is not properly

tuned

• Contact APC Worldwide Customer Support.

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APC ACRC301S User's Guide Page 49

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