Specifications

8
Figure 8-1: Piping method recommended when
obstruction prevents dispersion tube from being
continuously pitched back to humidifier
INSTALLATION
Figure 8-2: Piping method recommended when
humidifier must be mounted higher than the duct
OM-749
Obstruction
¾" Tubing
Funnel or
Floor Drain*
4" Min.
5" Min.
As part of the fill valve assembly, the needle valve
restricts the rush of cold water entering the evaporating
chamber during the fill cycle. Adjusting the supply water
flow with the needle valve will reduce fill cycle noise
from the collapsing steam head in the humidifier. Ad-
justing the needle valve will also reduce the drop in
output during a fill cycle. Care must be taken to not
reduce the fill rate below the humidifier's capacity, this it
will cause a low-water shutdown.
Vapor Hose Piping
When a vapor hose and stainless steel dispersion
tubes are used, they should be pitched back to the
humidifier. A minimum slope of 2" per foot (with no “low
spots”) is recommended. When this is not possible due
to duct elevation or an obstruction, alternate arrange-
ments may be used as shown in figures 8-1 and 8-2
below.
Any condensate that forms in the vapor hose must be
removed. Preferably, it should be returned to an open
drain with a water seal of sufficient height to contain the
duct static pressure, as shown in figure 8-1.
Notes:
• The GTS typically requires multiple dispersion tubes.
* Refer to local codes for drain pipe size requirements.
OM-750
GTS
Duct
Drain Piping and Material
Drain piping diagrams are provided on page 15. If non-
metallic pipe or hose is used, it must be capable of
withstanding temperatures up to 212°F.
To prevent steam from escaping out the drain line, a
water seal must be provided in the drain line of sufficient
height to contain the pressure developed within the
humidifier and steam dispersion system. To determine
the proper height of the water seal, see table 15-1 on
page 15.
Make-up Water Piping and Material
Make-up water piping diagrams are provided on page 15.
Minimum make-up water pressure must be 25 psig.
When non-metallic water piping is used, it must be rated
to withstand 212°F or greater temperature. If not, the
final 3 feet connected to the humidifier should be metallic
and should not be insulated.
GTS
Duct
Inline Tee
(1½" Dia. - Part # 162710)
(2" Dia. - Part # 162712)
Inline Tee
(1½" Dia. - Part # 162710)
(2" Dia. - Part # 162712)
GTS-IOM-1298.pdf 8 11/17/2009 3:57:03 PM