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IMPORTANT SAFETY INSTRUCTIONS
SAVE THESE INSTRUCTIONS
This manual contains important instructions that should be followed during the installation and
maintenance of the Liebert Static Transfer Switch 2 (STS2).
!
WARNING
The unit is supplied by more than one power source. The unit contains hazardous voltages if
any of the input sources are 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.
NOTE
Read the entire manual before installing or operating the system. Adhere to all operating
instructions and warnings on the unit and in this manual.
Liebert Corporation neither recommends nor knowingly sells this product for use with life
support or other FDA-designated “critical” devices.
The Static Transfer Switch is suitable for indoor use only. Protect the unit from excessive
moisture and install the unit in an area free from flammable liquids, gases, or corrosive
substances.
The unit is designed to operate from solidly grounded AC power sources only. Provide input
over-current protection in accordance with the unit ratings. Wire and ground the unit
according to national and local electrical safety codes. All wiring should be installed by a
qualified electrician.
Before unit is placed into service for the first time, after equipment relocation, or after the unit
has been de-energized for an extended period of time, a thorough equipment inspection and
supervised start-up by qualified service personnel are strongly recommended.
!
CAUTION
This unit complies with the limits for a Class A digital device, pursuant to Part 15 Subpart J
of the FCC rules. These limits provide reasonable protection against harmful interference in a
commercial environment. This unit generates, uses and radiates radio frequency energy and,
if not installed and used in accordance with this instruction manual, may cause harmful
interference to radio communications. Operation of this unit in a residential area may cause
harmful interference that the user must correct at his own expense.
!
WARNING
Locate the center of gravity symbols and determine the unit’s weight before handling
the cabinet.