4.1.1 Field-installed, Gravity-fed Drain Line Requirements
NOTICE
Risk of water backing up in the drainline. Leaking and overflowing water cancause equipment and building
damage.
Do not install an external trap inthe drainline. This line already has a factory-installed trap inside the cabinet.
Installationof a second trap will prevent drain-water flow and will cause the water to overflow the drainpan.
Sagging condensate drain lines may inadvertently create anexternal trap.
NOTICE
Risk of a catastrophic water circuit rupture. Cancause expensive building and equipment damage.
Install an overflow drainpan under the unit witha monitored leak detectionsystem inthe panand shutoff
valves in the supply and return water 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 than the supply water pressure. If it is not possible to install an overflow drainpan, thena monitored
leak detectionsystem should be installed inthe base of the unit or under the unit toactuate the shutoff valves
immediately on a leak detectionsignal.
The overflow drain panshould have a drain line connected to it that flows toa floor drain or maintenance sink in
case of a shutoff valve or leak detectionsystem malfunction.
A 3/4-in. NPT-Female drain connectionis provided onCW038toCW084 unitswithout anoptional condensate pump. A
1-1/4in. NPT-Female drainconnectionis provided on CW106 to CW400 units. A 1-1/4 in. NPT-Female
Observe the following requirements and refer to Figure 5.1 on the next page, when installing 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 tofreezing temperatures.
• The drainshould be the full size of the drainconnection.
• The drainline must slope continuously away from the unit. Pitch drain line toward draina minimum of 1/8in.
(3mm) per 1ft (305mm) of length.
• Drain is trapped internally. Do not externally-trap the drainline.
• The drainline must be rigid enough that it does not sag betweensupports, which unintentionally creates traps.
• The drainline must comply with all applicable codes.
• Onunits withthe optional, field-installed condensate pump, see Field-installed Condensate Pump onpage35
and Condensate-pump Drain Line Requirements on page35.
4 Piping Requirements
33
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