38
STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
INSTALLATION
STS humidifi er
Duct
1/2" (DN15) O.D.
condensate drain tube, pitch
1/4"/ft (2%)
3/4" (DN20) condensate return
connection (on face plate)
H2 (see Table
24-1)
5" (127 mm)
water seal
DC-1473b
6" (152 mm)
minimum
1/2" (13 mm)
air vent
6" (152 mm)
minimum
90% long sweep or two 45° elbows
Steam hose or tubing
Pitch*
1/4" pipe
thread (DN8)
OM-351b
Mounting bracket
Thermal-resin tubelets
(steam orifi ce inserts)
Movable escutcheon plate. Plate
can be mounted within limits of
2.5" (64 mm).
1/4" (DN8) pipe
thread end
1/2" O.D. (DN15) condensate drain
Condensate drain tube, by installer, 3/4" DN20 minimum. Return line
piping material must be suitable for 212 °F (100 °C) water. Note:
Condensate may be returned to the humidifi er or wasted to a drain.
See the previous page for piping condensate to a drain.
Mounting nut, 3/8" (M10)
Pitch tube toward drain
1/8"/ft (1%)
Dashed lines indicate provided by installer
* Pitch steam hose or tubing toward humidifi er:
– 2"/ft (15%) when using steam hose
– 1/2"/ft (5%) when using 1½" tubing
– 1/4"/ft (2%) when using 2" tubing
Secure and seal
escutcheon plates
Dispersion: Single tube and multiple tube
FIGURE 38-1: SINGLE TUBE WITH CONDENSATE RETURNED TO HUMIDIFIER
FIGURE 38-2: SINGLE TUBE DISPERSION WITH CONDENSATE DRAIN
Dispersion tube
