Specifications

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Condensate drain connection to SDU-E fan unit
1. Piping must be minimum ¾" I.D. (DN20) and rated for 212 °F
(100 °C) minimum continuous operating temperature.
2. Drain line must be piped as shown in the drawing below.
Provide a 6" (152 mm) drop prior to a 4" (102 mm) water seal to:
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3. After the water seal, run the drain line to an open drain with a 1"
(25 mm) vertical air gap. Cut the drain line at a 45 degree angle
on the end above the drain to permit a direct stream of water
into the drain pipe while maintaining a 1" (25 mm) air gap.
4. All drain lines must be installed and sized according to
governing codes.
5. The drain line should have a union installed directly on the
dispersion box ¾" (DN20) nipple to accommodate future
removal of the SDU-E shroud.
6. A drain line and water seal must be connected to the SDU-E fan
unit dispersion box ¾" (DN20) nipple.
Important: If condensate is not drained from the dispersion
box, standing water will accumulate.
7. The dispersion box is constructed with a pitch toward the drain;
however, the SDU-E frame must be installed plumb and level for
the dispersion box to drain properly.
WARNING!
If standing water is allowed to accumulate in
the dispersion box:
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which can cause illness.
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and can cause hot water at 212 °F
(100 °C) to discharge from the SDU-E fan
unit, which can cause severe personal
injury.
Figure 20-1:
SDU-E drain line piping
Install SDU-E frame
plumb and level
Union
Elbow
1" (25 mm) air gap
Dispersion box
¾" pipe thread (DN20) dispersion box drain
and P-trap piping, rated for 212 °F (100 °C)
Drain
4" (102 mm)
Spill funnel. Plumb to floor drain.
Open floor drain. Refer to governing codes for drain
pipe size and maximum temperature requirements.
OM-1245
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VM-IOM-1108.pdf 22 4/21/2010 1:36:21 PM