Liebert 1000A User Manual

Read this manual thoroughly before working with the Liebert STS2.
Be sure to review the warning under Important Safety Instructions on page 1.
Refer to the Handling Considerations on page 5 before attempting to move the unit.
Under typical operation and with the doors closed, only normal safety precautions are necessary. The 

area around the Liebert STS2 should be kept free from puddles of water, excess moisture and debris. 

The vent grate in the front of the system should not be obstructed in order to ensure a smooth air flow 

through the unit for cooling.
ONLY qualified service personnel should perform maintenance on the Liebert STS2. When 

performing maintenance on any part of the equipment under power, service personnel and test 

equipment should be located on rubber mats. The service personnel should wear insulating shoes for 

isolation from direct contact with the floor.
Unless all power is removed from the input sources to the unit, one person should never work alone. A 

second person should be on hand to assist and summon help, should an accident occur.
Three types of messages are used throughout this manual to stress important text. Carefully read the 

information below each Warning, Caution and Note and use professional skills and prudent care 

when performing the actions described in that text.
A Warning indicates the presence of a possible serious, life-threatening condition. For example:

A Caution indicates a condition that could seriously damage the equipment and possibly injure 

personnel. For example:

A Note emphasizes important text. If the instructions are not properly followed, the equipment could 

be damaged or may not properly operate. For example:

The unit is supplied by more than one power source. The Unit contains hazardous voltages if 

any of the input sources is ON, even when the unit is in bypass. To isolate the unit, turn OFF 

and lock out ALL input power sources.
Verify that all input power sources are de-energized and locked out before making connections 

inside unit.
Lethal voltages exist inside the unit during normal operation. only qualified service personnel 

should perform maintenance on the static switch.

Risk of unit damage
The input sources to the static switch must be grounded-wye sources. input sources other 

than solidly grounded-wye sources may cause damage to the switch.

NOTE
Read this entire manual before installing and operating the unit.