Nortec GS Series - Manual (Page 29)

GS Series Installation | 26
Drain Line
The humidifier is equipped with a ¾”O.D. unthreaded drain outlet connection on the side of the humidifier.
A vacuum break valve is installed internal to the unit on the drain line. The drain water line must be piped to
a drain funnel to provide an air gap before connection to the building drainage system.
The air gap must be within 3 ft (1 m) of the humidifier.
The drain line should not end in a sink used frequently by personnel, or where plumbing codes prohibit it.
Route to a floor drain or equivalent for safety reasons. Internal drain water tempering will ensure a maximum
of 140ºF (60ºC) exiting water temperature.
Never install PVC piping as a drain line material. Always use material suitable for with-standing 140ºF
(60ºC).
Keep drain lines as short as possible. Keep drain lines sloped down, not level and not up since low spots in
drain lines will accumulate sediment and cause backup. The drain line should be 1-1.5" O.D. or larger.
Consult local codes.
When the drain pump is activated, the tank drains at a rate of 4.5-5.3 gal/min (18-20 l/min).
Aux Drain Port
An auxiliary drain port is also provided on the side of the humidifier. It can be used to manually drain the
unit, if required. The unit is shipped with this connection plugged. It is recommended to install a shut off
valve on this line (see Figure 16).
The auxiliary drain port is used with the standard freeze protection on Outdoor units. Install a shut off valve
on this line and pipe to the drain funnel (see Figure 16). The manual shut off valve must always be in the
open position when the unit is operating but can be closed for servicing of the unit.
Steam Lines and Condensate Line
Steam hoses and clamps are provided with the GS humidifier for connection to the steam lines. Refer to
Figure 17 for connection details.
For steam line installation between the humidifier and distribution system, consult the distribution system
installation manual. Steam Distributor Installation Manual. See Table 5: Steam Line Sizing for details on the
sizing and lengths of steam lines.
The GS Series of Gas-Steam humidifiers can develop steam pressures up to 12”w.c. to overcome duct and
steam line pressures. An enclosed trap on the drain line prevents steam from going to drain. Duct
pressures above 12” will cause steam to exits through the drain line. Consult factory.