24
STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
INSTALLATION
Optional condensate return
piping from evaporative
dispersion unit*
Air vent tube
3/4" (DN20) minimum
condensate drain piping
rated for 212 °F (100 °C)*
Strainer
Unions (by installer)
Steam outlet
Install level
Install level
Over
fl ow
line
Trap
If run is over 10' (3 m),
increase pipe to 1¼" (DN32)
Water seal line MUST
be below drain valve to
ensure humidifi er drains
correctly
1" (25 mm) air gap
Open fl oor drain.
See fi rst note below.
DC-1459
6"
(152 mm)
minimum
Notes:
• Offset hu
mid i fi er from fl oor drain to prevent fl ash steam from rising into the hu mid i fi er.
•
Locate air gap only in spaces with adequate temperature and air movement to absorb fl ash steam; otherwise, condensation may form on nearby
surfaces. Refer to governing codes for drain pipe size and maximum discharge water temperature.
•
Water supply inlet is more than 1" (25 mm) above skim/overfl ow port, eliminating the pos si bil i ty of backfl ow or si phon ing from tank. No additional
backfl ow prevention is required; however, governing codes prevail.
• Damage caused by chloride corrosion is not covered by your DriSteem warranty.
• Dashed lines indicate provided by installer.
Vacuum breaker
(by installer)
Condensate return to
nonpressurized system,
by gravity only
12"
(305
mm)
minimum
drop to
trap
If water piping to humidifi er is nonmetallic, we recommend
a 2" (50 mm) metallic water seal or loop in the supply line
to isolate steam during maintenance
Water supply line (see Table 25-1); water pressure range
25 to 80 psi (172 to 582 kPa); fi rst 3' (1 m) of supply line
must be rated for 212 °F (100 °C)
H2 (see Table
24-1)
From
steam
source
H1 (see
Table
24-1)
Pitch 1/8"/ft
(1%) toward drain
3/4" pipe thread (DN20)
dispersion unit condensate return inlet*
mc_010411_1556-di
Manual SST drain valve (electric drain valve
available for end-of-season drain option)
Table 24-1:
Heights required to overcome humidifier internal pressure (H1, H2)
Unit output
Water seal height (H1)
Air vent height (H2)
All STS models
STS models
25, 50, 100, 200, 400
800
lbs/hr
kg/h
inches
mm
inches
mm
inches
mm
138
62
12
305
27
686
—
—
139-183
63–83
15
381
30
762
—
—
> 183
> 83
18
457
33
838
42.25
1073
mc_010611_0730
* Condensate return piping is
not needed for Ultra-sorb
®
Model XV dispersion unit,
which returns pressurized
condensate to the boiler.
See the Ultra-sorb Model
XV Installation Guide
for condensate piping
requirements.
Piping: RO/DI water option, one heat exchanger
FIGURE 24-1: FIELD PIPING OVERVIEW FOR STS MODELS 25, 50, 100, 200, AND 400 WITH RO/DI WATER OPTION
Drain, skim, overfl ow piping
rated for 212 °F (100 °C)
(see sizes in Table 25-1)
