25
VAPORSTREAM INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
The drain line piped from the humidifi er must be run to an approved sanitary
waste or suitable drain. If nonmetallic pipe or hose is used, it must be rated for
212 °F (100 °C) minimum continuous operating temperature.
Minimum drain pipe size is 3/4" (DN20) inside diameter. If the length of the
drain piping exceeds 10' (3 m), increase the pipe size to 1¼" (DN32) pipe.
Do not locate the humidifi er directly above a fl oor drain — skim and drain
water dumped into the drain will cause fl ash steam. This steam will rise
and saturate electrical components, adversely affecting component life and
performance.
An open drain with a 1" (25 mm) air gap between the drain piping and the
drain is required. Locate air gap only in spaces with adequate temperature
and air movement to absorb fl ash steam, or condensing on nearby surfaces
may occur.
Governing codes may require that the 212 °F (100 °C) drain and skim water
from the humidifi er be tempered before it is discharged into the building drain
piping. The Drane-kooler option will temper 6 gpm (22.7 L/m) of 212 °F
(100 °C) water to 140 °F (60 °C).
To allow normal operation and prevent steam from escaping through the drain
line, the installer must provide a water seal of suffi cient height to contain the
pressure developed in the humidifi er system.
See Table 23-1 for water seal
heights.
Drain piping after the water seal must be pitched a minimum of 1/8"/ft (1%)
toward the drain. Governing codes may require more pitch.
If the proximity of a drain requires the humidifi er drain and skim water to be
lifted by a pump, DriSteem offers a condensate pump option (see Figure 25-1).
A check valve is required on the discharge of the pump. Electrical power for
the pump is independent of the humidifi er. Plug the pump into a wall outlet; an
integral fl oat switch turns the pump on and off.
OM-956
DriSteem's Drane-kooler, shown mounted to a
Vaporstream humidifi er, tempers discharged
water temperature. For other Drane-kooler
mounting options or for more information,
contact DriSteem or view the Drane-kooler
product data sheet in the literature section at
www.dristeem.com
INSTALLATION
Drain
FIGURE 25-1: DRANE-KOOLER
™
WATER
TEMPERING DEVICE
Piping:
