4.1.1 Field-installed, Gravity-fed Drain Line Requirements
NOTICE
Risk of water backing up inthe drainline. Leaking and overflowing water cancause equipment and building
damage.
Do not install anexternal trap inthe drainline. This line already has a factory-installed trap inside the cabinet.
Installationof a second trap will prevent drain-water flowand will cause the water to overflow the drainpan.
Sagging condensate drainlines may inadvertently create anexternal trap.
NOTICE
Risk of a catastrophic water circuit rupture. Cancause expensive building and equipment damage.
Install anoverflow drainpanunder the unit witha monitored leak detectionsystem inthe panand shutoff
valves inthe supply and returnwater lines that automatically close if water is detected by the leak detection
system. The shutoff valves should be spring returnand must be rated for a close-off pressure that is the same as
or higher thanthe supply water pressure. If it is not possible to install anoverflow drainpan, thena monitored
leak detectionsystem should be installed inthe base of the unit or under the unit to actuate the shutoff valves
immediately ona leak detectionsignal.
The overflow drainpanshould have a drainline connected to it that flows to a floor drainor maintenance sink in
case of a shutoff valve or leak detectionsystem malfunction.
A 3/4-in. NPT-Female drainconnectionis provided onCW038 to CW084 units without anoptional condensate pump. A
1-1/4 in. NPT-Female drainconnectionis provided onCW106 to CW400 units. A 1-1/4 in. NPT-Female
Observe the following requirements and refer to Figure 5.1 onthe next page, wheninstalling and routing the drainline:
•
The drainline must be sized for 2 gpm (7.6 l/m) flow.
•
The drainline must be located so it will not be exposed to freezing temperatures.
•
The drainshould be the full size of the drainconnection.
•
The drainline must slope continuously away from the unit. Pitchdrainline toward draina minimum of 1/8 in.
(3 mm) per 1 ft (305 mm) of length.
•
Drainis trapped internally. Do not externally-trap the drainline.
•
The drainline must be rigid enoughthat it does not sag betweensupports, whichunintentionally creates traps.
•
The drainline must comply withall applicable codes.
•
Onunits withthe optional, field-installed condensate pump, see
Field-installed Condensate Pump
and
Condensate-pump DrainLine Requirements
4 Piping Requirements
33
Summary of Contents for Liebert CW 038
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