
D R I - S T E E M V a p o r s t r e a m h u m i d i f i e r • P a g e 2 3
Figure 23-1:
Field piping overview Vaporstream Model VLDI (DI/RO water models)
Figure 23-1 notes:
• Locate air gap only in spaces with adequate temperature and air movement to absorb flash steam; otherwise, condensation may form on nearby surfaces.
Refer to governing codes for drain pipe size and maximum discharge water temperature.
• Offset humidifier from floor drain to prevent flash steam from rising into the humidifier.
• Dashed lines indicate provided by installer.
• The water supply inlet is more than 1" (25 mm) above the overflow port, eliminating the possibility of backflow or siphoning from the tank. No additional
backflow prevention is required; however, governing codes prevail.
• Damage caused by chloride corrosion is not covered by your DRI-STEEM warranty.
• See the previous page for recommended water supply piping for Model VLC (standard water system).
VLC-OM-011
Va p o r s t r e a m M o d e l V L D I p i p i n g
Notes:
• Locate air gap only in spaces with adequate temperature and air movement to absorb
flash steam; otherwise, condensation may form on nearby surfaces. Refer to governing
codes for drain pipe size and maximum discharge water temperature.
• Use this piping configuration when water seal must be elevated above flow line of
drain connection, such as when the humidifier is mounted near the floor.
• Dashed lines indicate provided by installer
Figure 23-2:
Alternate water seal and drain valve piping
Skim/overflow outlet
Open drain required. See first note below.
Air gap
Drain
connection
H1 (see table on Page 22)
Top of water seal must be
below skim/overflow outlet
VLC-OM-012
Figure 23-3:
VLDI Models 2-1 through 5-1 piping
OM-4004
Drain valve
Fill
valve
Skimmer port
Drain piping
Install level
Install level
¾" (DN20) minimum
condensate drain piping rated
for 212 °F (100 °C)
Air vent height must
be equal to or greater
than dimension H2
(see table pn Page 22).
Air
vent
tube
Optional condensate
return piping from
dispersion
unit
Steam outlet
¾" (DN20) min. drain overflow
piping rated for 212 °F (100 °C)
¾" (DN20)
drain valve
If run is over 10' (3 m), increase
pipe to 1¼" (DN32)
Flow line of drain piping after the water
seal must be below the drain valve to
ensure that humidifier drains correctly
1" (25 mm) air gap
¾" pipe thread
(DN20) dispersion unit
condensate return inlet
Overflow
Strainer, by installer
6"
(150 mm)
minimum
Water supply line; water pressure range 25 psi to 80 psi (172 kPa
to 552 kPa); first 3' (1 m) is recommended to be stainless steel
tubing with a 2" (50 mm) water seal or loop in the supply line to
isolate steam during DI/RO water system maintenance
Drain piping
flow line
Pitch 1/8
"
/ft (1%)
Open drain required. See first note below.
H1
(see
table
below)
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