23
STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
INSTALLATION
DC-1467
Strainers
Over
fl ow
line
Traps
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.
Table 23-1:
STS connection sizes
Description
Connection size
Water makeup (fi ll)
1/4" pipe thread (DN8), all STS models
Drain
3/4" (DN20) for STS models 25 through 100
1" (DN25) for STS models 200 through 800
Steam outlet
Varies with capacity and dispersion type; see Table 27-1
Condensate return
3/4" pipe thread (DN20)
Pressurized steam supply inlet and
return outlet
See sizes in Tables 5-1 and 5-2.
mc_010411_1555
Shock arrestor (by installer) recommended to eliminate water hammer
mc_010411_1550-tap
Piping: Tap/softened water, two heat exchangers
FIGURE 23-1: FIELD PIPING OVERVIEW FOR TAP/SOFTENED WATER STS MODEL 800
Optional condensate return
piping from evaporative
dispersion unit*
Air vent tube
3/4" (DN20) minimum condensate
drain piping rated for 212 °F (100 °C)*
Unions (by installer)
Water supply shut-off valve (by installer)
Steam outlet
Install level
Install level
Electric drain valve
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.
Drain, skim, overfl ow
piping rated for
212 °F (100 °C)
(see sizes in Table
23-1)
6" (152 mm) minimum
Vacuum breaker
(by installer)
Condensate return to
nonpressurized system,
by gravity only
12"
(305
mm)
minimum
drop to
trap
Water supply line (see Table 23-1); water pressure range
25 to 80 psi (172 to 582 kPa); water conductivity
30 μS/cm minimum
H2 (see
Table 22-1)
From
steam
source
H1 (see
Table
22-1)
Pitch 1/8"/ft
(1%) toward drain
3/4" pipe thread (DN20) dispersion unit condensate return inlet*
* 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.
