Vertiv Liebert DSE - 5.1 Drain and Humidifier Fluid Piping

5.1 Drain and Humidifier Fluid Piping
NOTICE
Risk of water leakage. Can cause severe property damage and loss of critical data center
equipment.
The Liebert® DSE requires a water drain connection. Improper installation, application and
service practices can result in water leakage from the unit.
Do not locate the unit directly above any equipment that could sustain water damage.
We recommend installing monitored leak detection equipment for the water supply lines and
the internal unit water lines.
5.1.1 Field-installed, Gravity-fed Drain Line Requirements
NOTICE
Risk of water backing up in the drain line. Leaking and overflowing water can cause equipment
and building damage.
Do not install an external trap in the drain line. This line already has a factory-installed trap
inside the cabinet. Installation of a second trap will prevent drain-water flow and will cause the
water to overflow the drain pan.
This line may contain boiling water. Use copper or other material that is rated for handling
boiling water for the drain line. Sagging condensate drain lines may inadvertently create an
external trap.
A 3/4-in. NPT-Female drain connection is provided on DA050 to DA085 units without an optional
condensate pump. A 1-1/8in. NPT-Female drain connection is provided on DA125 to DA165 units without
an optional condensate pump.
Observe the following requirements and refer to Figure 5.1 on the facing page, when installing and
routing the drain line:
• The drain line must be sized for 2 gpm (7.6 l/m) flow.
• The drain line must be located so it will not be exposed to freezing temperatures.
• The drain should be the full size of the drain connection.
• The drain line must slope continuously away from the unit. Pitch drain line toward drain a
minimum of 1/8in. (3mm) per 1ft (305mm) of length.
• Drain is trapped internally. Do not externally-trap the drain line.
• The drain line must be rigid enough that it does not sag between supports, which
unintentionally creates traps.
• Use copper or other material suitable for draining water that can reach temperatures up to
212°F (100°C).
• The drain line must comply with all applicable codes.
• On units with the optional, factory-installed condensate pump, see Factory-installed
Condensate Pump on page34 and Condensate-pump Drain Line Requirements on page34.
Vertiv | Liebert® DSE™ Installer/User Guide
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