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4.1.2 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.
Sagging condensate drain lines may inadvertently create an external trap.
Observe the following requirements when installing and routing the drain line:
•
Do not reduce drain lines.
•
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.
•
We recommend installing monitored, under-floor leak-detection equipment.
Field-installed Condensate Pump
In most cases of units with a field-installed condensate pump, the unit ships from the factory with the un-mounted
condensate pump inside the unit, with the following exceptions:
•
On upflow units with bottom-return, the pump ships loose for field-installation.
•
On CW038 and CW060 units with EC fans, the pumps ships loose for under-floor field installation.
•
The unit has an internally-mounted trap. The discharge (drain) line from the pump must comply with all
applicable codes.
4.1.3 Water Supply-line Requirements for the Optional Humidifier
The unit may have an optional humidifier. Refer to the appropriate supply-line piping requirements if a humidifier is
included on your unit:
Infrared Humidifier:
•
1/4-in. supply line, maximum water pressure is 150 psi (1034 kPa).
•
Size supply line for 1 gpm (3.8 l/m), with a minimum water pressure of 20 psi (138 kPa).
•
Do not supply de-ionized water to the humidifier.
4 Piping Requirements
Table 5.3 Gravity-fed Drain Line Figure Descriptions (con-
tinued)
Item
Description
7
Continuousdownwardslope
8
External trap. Do not trapexternally.
9
External traps, althoughunintentional. Linesmust be rigidenoughnot to bow.
10
Internal drain
35
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