Item Description
7 Continuousdownwardslope
8 External trap. Do nottrapexternally.
9 External traps, althoughunintentional. Linesmustbe rigidenoughnot tobow.
10 Internal drain
Table 5.3 Gravity-fed Drain Line Figure Descriptions (con-
tinued)
4.1.2 Condensate-pump 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.
Observe the following requirements when installing and routing the drainline:
• Do not reduce drainlines.
• The drainline must be located so it will not be exposed tofreezing temperatures.
• Size the piping based onthe available condensatehead.
• 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.
• We recommend installing monitored, under-floor leak-detectionequipment.
Field-installed Condensate Pump
Inmost cases of units witha field-installed condensate pump, the unit ships from the factory with the un-mounted
condensate pump inside the unit, withthe following exceptions:
• Onupflow units withbottom-return, the pump ships loose for field-installation.
• OnCW038 and CW060 units with EC fans, the pumps ships loose for under-floor field installation.
• The unit has aninternally-mounted trap. The discharge (drain) line from the pump must comply withall
applicable codes.
4.1.3 Water Supply-line Requirements for the Optional Humidifier
The unit may have an optional humidifier. Refer tothe appropriate supply-line piping requirements if a humidifier is
included onyour unit:
Infrared Humidifier:
• 1/4-in. supply line, maximum water pressure is 150 psi (1034kPa).
• Size supply line for 1 gpm (3.8l/m), witha minimum water pressure of 20psi(138kPa).
• Do not supply de-ionized water tothe humidifier.
4 Piping Requirements
35
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