16
PIPING DIAGRAMS: STEAM, WATER AND DRAIN
Alternate Water Seal and Drain Valve Piping (by installer)
Used when water seal must be elevated above flow line of drain connection (humidifier near floor)
Standard Unit (Non-DI/RO Water)
Note: Drain piping material must be suitable for 212°F (100°C) water.
DI/RO Water Unit
Table 16-1: Water Seal Height (H)
Recommendations
Note: If piping to dispersion tube is over 20 feet (6
meters) increase water seal height by 15%.
OM-633
¾" (20 mm)
SST Drain Valve
H
Float Operated Water
Make-up Valve
Overflow - ¾" (20 mm)
¼" (6 mm) NPT Water Supply,
25 psi minimum, (172 kPa)
Drain and Water Seal
Piping - ¾" (20 mm)
(by installer)
Air Gap
Open Drain
*
Float Operated
Low-Water Cut-off
Heaters
OM-634
Heaters
H
Clean-out Tray
Clean-out
Plate
Three Probe Level Control
and Low-Water Cut-off
Drain
Connection
Open Drain
*
Air Gap
Drain and Water Seal Piping - ¾" (20 mm)
(by installer)
Manual or Optional Electric Drain Valve
Water Supply Line (25 psi minimum)
Water Skim/Overflow Outlet - ¾" (20 mm)
Needle Valve
Solenoid Water Make-up Valve
* Refer to local codes for drain pipe sizing and maximum temperature requirements.
OM-635
Solenoid Water
Make-up Valve
Needle
Valve
Water Skim/
Overflow Outlet
Water Supply Line,
25 psi minimum,
(172 kPa)
Note: Flow
Line of Water
Seal cannot
be above Flow
Line of
Skimmer
Outlet
Air Gap
Open Drain
*
Manual or Optional Electric Drain Valve
Drain Connection
Clean-out Plate
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Field installed for
clean-out
