APC ACPA4000 User Manual

The condenser filter traps large items that may fall into the ducts. Periodically check and clean the filter 
to prevent damage to the condenser. While power is off, test the LCDI plug for proper operation.

1. Turn off the equipment and unplug it from its 

electrical outlet.

2. Remove the condenser air intake duct from the back 

of the equipment.

3. Clean the filter (inside the air intake duct) using your 

hand or a dry cloth. 

4. Press the TEST button on the LCDI plug. The 

POWER LED should go off.

5. Press the RESET button on the LCDI plug. The 

POWER LED should come on.

Turn off the equipment and unplug it from its electrical outlet. Use a moist rag to wipe down the cabinet.

Caution: Do not clean the surface with thinners, alcohol, polishing powder, alkaline 
detergent, acid, or an abrasive brush. Using these items will damage the cabinet.

Occasionally, new firmware becomes available which may add new features. Firmware is available for 
download through the APC software/firmware downloads page, www.apc.com/tools/dowload. 

You will need a computer with a serial port, a null modem serial cable, and a terminal emulation program 
that can use the xmodem protocol.

See “How to download firmware” on page 25.

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Caution: To avoid equipment damage, do 
not test the LCDI plug while the equipment 
is operating.

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