35
GTS HUMIDIFIER LX SERIES INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
Inlet drain water piping, by installer
DC-1117
Note: Size water pump to handle a minimum of 12 gpm (45.4 L/m).
Check valve
Discharge piping, by installer
Water pump
Drain water tempering
Governing codes may require that the 212 °F
(100 °C) drain and skim/overflow water
from the humidifier be tempered before it is
discharged into the building drain piping. The
GTS humidifier has closed loop integral drain
tempering.
Integral tempering sequence:
1. Water greater than 140 °F (60 °C) is
detected in the drain manifold with a
temperature sensor.
2. Tank fill valve opens and directs cold
water through the tank and toward the
drain.
3. Drain valve opens and sends tempered
water to the drain manifold.
4. Feedback from the drain manifold
temperature sensor will open/close the
drain valve/fill valves to maintain a
maximum of 140 °F (60 °C) in the drain
manifold.
INSTALLATION
Supply water and drain
Piping:
FIGURE 35-1: LIFTING DRAIN WATER
FIGURE 35-2: VERTICAL DRAIN
OM-8023
Open
drain or
vacuum
breaker
(by
installer)
Install open drain or
vacuum breaker within
12" (305 mm)
Greater than
12" (305 mm)
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.
An open drain or vacuum breaker 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 flash steam; otherwise,
condensing on nearby surfaces may occur.
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 humidifier drain and skim water to be
lifted, use a water pump with capacity of at least 12 gallons per minute (gpm)
or 45.4 litres per minute (L/m). A check valve is required on the discharge of
the pump (see Figure 35-1). Electrical power for the pump is independent of
the humidifier.
The GTS humidifier has an auxiliary 3/4" (20 DN) drain outlet located on or
near the cleanout plate. This drain outlet can be hard-piped during installation
to enable rapid tank draining before maintenance. This outlet can also provide
access for removing scale from the tank bottom. If this connection is used,
install a union to facilitate removal of the cleanout plate.
