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DRI-STEEM GTS Humidifier Installation, Operation, and Maintenance Manual • Page 25

The drain line piped from the humidifier must be run to

an approved sanitary waste or suitable drain. Although the

GTS humidifier is equipped with integral water tempering, if

nonmetallic drain pipe or hose is used, DRI-STEEM recommends

it be rated for 212 °F (100 °C) minimum continuous operating

temperature.

Minimum drain pipe size is 1½" (DN40) inside diameter. Do not

reduce the size of the drain piping. If the length of the drain piping

exceeds 10' (3 m), increase the pipe size. 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.

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 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).

Contact DRI-STEEM to order a drain pump suitable for your

installation. A check valve is required on the discharge of the pump

(see Figure 25-1). Electrical power for the pump is independent

of the humidifier.

The GTS humidifier has an auxiliary 1½" (DN40) drain outlet

located below the subpanel. 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.

D r a i n p i p i n g

Inlet

drain

water

piping,

by installer

Figure 25-1:

Lifting drain water

DC-1117Note: Size water pump to handle a minimum of 12 gpm (45.4 L/m).

Check valve

Discharge

piping, by

installer

Water pump

Table 25-1:

Integral water tempering

specifications

Water type

Maximum

low rate

Maximum

temperature

U.S.

gpm

L/m °F °C

Hot water

inﬂow

6 22.7 212 100

Cold water

inﬂow*

6 22.7 70 21

Tempered

water outﬂow

12 45.4 140 60

Note:

* Cold water inﬂow pressure must be between 25 psi

and 80 psi (172 kPa and 552 kPa).

Integral water tempering chamber

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 an

integral water tempering chamber that

tempers 6 gpm (22.7 L/m) of 212 °F

(100 °C) water to 140 °F (60 °C). The water

tempering sequence of operation is:

1. Hot water discharged from the humidifier

enters the water tempering chamber

from either the skim/overflow port or the

tank drain.

2. Cold water enters the water tempering

chamber through a temperature-actuated

valve to mix with the hot discharged

water.

3. Tempered water at 140 °F (60 °C)

maximum exits through the water

tempering chamber side outlet for safe

discharge into a municipal sewer system

or PVC pipe.

4. In order to minimize DI/RO water use,

disconnect factory piping to the water

tempering device and pipe directly to tap

water.

5. If planning to use heated supply water,

disconnect the water line to the water

tempering device at the fill manifold,

and reconnect it to a cold water supply.

This will ensure that the water tempering

device operates properly.

Installation

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DriSteem Vapor-Logic Guide d'installation Page 27

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