APC ACRC500 Manuel d'installation télécharger pdf (Page 45)

37InRow RC Operation and Maintenance

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.

• Valve/actuator malfunction • Fully open the valve.

• Application error • Contact APC at a number located on the rear 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 • 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.

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APC ACRC500 Manuel d'installation Page 45

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