Vertiv Liebert DSE, System Design And User Manual, Page: 38 / 120

8.1.1 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.
Observe the following requirements 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.
• We recommend installing monitored, under-floor leak-detection equipment.
8.1.2 Condensate-pump 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.
Observe the following requirements when installing and routing the drain line:
• The drain line must be located so it will not be exposed to freezing temperatures.
• Size the piping based on the available condensate head.
• 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).
• We recommend installing monitored, under-floor leak-detection equipment.
Factory-installed Condensate Pump
If your unit includes an optional condensate pump, the pump is factory-installed inside the unit and a
3/4-in. copper sweat connection is provided on the unit.
Vertiv | Liebert® DSE™ System Design and User Guide
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