User manual

Important Safety Instructions
Liebert
®
DS
™
2
NOTICE
Risk of clogged or leaking drain lines. Can cause equipment and building damage.
This unit requires a water drain connection. Drain lines must be inspected regularly and
maintenance must be performed to ensure that drain water runs freely through the drain
system and that lines are clear and free of obstructions and in good condition with no visible
sign of damage or leaks. This unit may also require an external water supply to operate.
Improper installation, application and service practices can result in water leakage from the
unit. Water leakage can result in severe property damage and loss of critical data center
equipment.
Do not locate unit directly above any equipment that could sustain water damage.
Emerson recommends installing leak detection equipment for unit and supply lines.
NOTICE
Risk of a leaking coil due to freezing and/or corrosion. Can cause equipment and serious
building damage.
Cooling and heat rejection coils, heat exchangers and piping systems that are connected to
open cooling towers or other open water/glycol systems are at high risk for freezing and
premature corrosion. Fluids in these systems must contain the proper antifreeze and
inhibitors to prevent freezing and premature coil corrosion. The water or water/glycol solution
must be analyzed by a competent water treatment specialist before startup to establish the
inhibitor requirement. The water or water/glycol solution must be analyzed every six months
to determine the pattern of inhibitor depletion. The complexity of water-caused problems and
their correction makes it important to obtain the advice of a water treatment specialist and
follow a regularly scheduled maintenance program.
!
CAUTION
Risk of contact with hot surfaces. Can cause injury.
The compressors, refrigerant discharge lines, humidifiers and reheats are extremely hot
during unit operation. Allow sufficient time for them to cool before working within the unit
cabinet. Use extreme caution and wear protective gloves and arm protection when working on
or near hot compressors, discharge lines, humidifiers and reheats.
!
CAUTION
Risk of handling heavy and lengthy parts. Can cause personal injury and equipment damage.
Cabinet panels can exceed 5ft. (1.5m) in length and weigh more than 35lb. (15.9kg). Follow
relevant OSHA lifting recommendations and consider using a two-person lift for safe and
comfortable removal and installation of cabinet panels. Only properly trained and qualified
personnel wearing appropriate safety headgear, gloves and shoes should attempt to remove or
install cabinet panels.
NOTE
The Liebert indoor cooling unit has a factory-installed high-pressure safety switch in the high
side refrigerant circuit. A pressure relief valve is provided with Liebert Lee-Temp
™
condensers.
Consult local building codes to determine whether the Liebert Fan Speed Control and VFD
condensers will require field provided pressure relief devices.