23
RTS HUMIDIFIER RX SERIES INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
Drain
Piping:
DRAIN
Note: Follow governing code requirements regarding size of drain pipe.
The drain line piped from the humidifier must be run to an approved sanitary waste or suitable
drain. Although the RTS humidifier is equipped with integral water tempering, if nonmetallic
drain pipe or hose is used, it should be rated for 212 °F (100 °C) minimum continuous operating
temperature.
If vertical drop of drain exceeds 12” (305 mm) a vacuum breaker or open drain with air gap
must be installed within 6 vertical inches (152 mm) of unit. Failure to do so will create a siphon
during drain events, disrupting normal drain operation and allowing steam to enter the drain
through the overflow p-trap outlet (see Figure 23-1). Locate air gap only in spaces with adequate
temperature and air movement to absorb flash steam; otherwise, condensing on nearby surfaces
may occur.
Ensure the drain piping configuration (diameter, length, slopes, elbows, hangers, etc.) supports a
12 gpm flow rate for proper drain operation and to prevent overflow and spillage from an open
drain with air gap. If combining multiple drain lines together, ensure proper common pipe sizing
practices are used.
Do not locate the humidifier directly above a floor drain — skim and drain water dumped into the
drain will cause flash steam. This steam will rise and saturate electrical components, adversely
affecting component life and performance.
FIGURE 23-1: VERTICAL DRAIN
Install open drain or
vacuum breaker within
6" (152 mm)
INSTALLATION
OM-8080
Open drain or vacuum
breaker (by installer)
Drain valve
Greater than 12"
(305 mm)
