User manual

Piping
Liebert
®
DS
™
84
9.0 PIPING
All fluid and refrigeration connections to the unit, with the exception of the condensate drain, are
sweat copper. Factory-installed piping brackets must not be removed. Field-installed piping must be
installed in accordance with local codes and must be properly assembled, supported, isolated and
insulated. Avoid piping runs through noise-sensitive areas, such as office walls and conference rooms.
Refer to specific text and detailed diagrams in this manual for other unit-specific piping
requirements.
All piping below the elevated floor must be located so that it offers the least resistance to air flow.
Careful planning of the piping layout under the raised floor is required to prevent the air flow from
being blocked. When installing piping on the subfloor, it is recommended that the pipes be mounted in
a horizontal plane rather than stacked one above the other. Whenever possible, the pipes should be
run parallel to the air flow.
9.1 Fluid Connections
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.
9.1.1 Condensate Piping—Field-Installed
• Do not reduce drain lines
• Do not expose drain line to freezing temperatures
• Drain line may contain boiling water. Use copper or other suitable material
• Drain line must comply with local building codes
• Emerson recommends installing under-floor leak detection equipment
Gravity Drain—Units Without Factory-Installed Condensate Pump
• 3/4" FPT drain connection is provided on units without optional factory-installed condensate
pump with infrared humidifier or no humidifier; 1-1/4" FPT connection is provided on units with
steam generating humidifier
• Pitch drain line toward drain a minimum of 1/8" (3mm) per 1 foot (305mm) of length
• Drain is trapped internally. Do not trap external to equipment
• Drain line must be sized for 2 gpm (7.6 l/m) flow
NOTICE
The drain line must not be trapped outside the unit or water may back up in the drain pan.
NOTE
Seal openings around piping and electrical connection to prevent air leakage. Failure to do so
could reduce the unit’s cooling performance.