Drain Piping; Make-Up Water Piping; Vapor Hose Piping - VAPORSTREAM VLC Installation Instructions And Maintenance Operations Manual

Drain Piping

A drain line should be extended from the skimmer
connection to a sanitary waste or suitable drain. If non-
metallic pipe or hose is used, it must be capable of
withstanding temperatures up to 100° C.
To prevent steam from escaping out the drain line, a
water seal must be provided in the drain line of suffi-
cient height to contain the pressure developed within
the humidifier and steam dispersion system. To deter-
mine the proper height of the water seal, see
table 17-1.

Make-up Water Piping

When non-metallic water piping is used, it must be
rated to withstand 100° C or greater temperature. If
not, the final 1 meter connected to the humidifier
should be metallic and should not be insulated.
As part of the fill valve assembly, the needle valve
restricts the rush of cold water entering the evaporating
chamber during the fill cycle. Cold water could drop the
chamber water temperature and collapse the steam. If
a rumbling sound occurs during the fill cycle, adjust the
needle valve to decrease the water fill rate.
Figure 15-1: Piping method recommended when
obstruction prevents dispersion tube from being
continuously pitched back to humidifier
125 mm
100 mm
min.
min.
OM-698
INSTALLATION REQUIREMENTS
Obstruction
20 mm Tubing
Funnel or Floor Drain*
* Refer to local codes for drain pipe size requirements.
®
The VAPORSTREAM Model VLC has a 25 mm
internal "air gap". However, local codes may require a
vacuum breaker.

Vapor Hose Piping

When a vapor hose and stainless steel dispersion
tube are used, they should be pitched back to the
humidifier. A minimum slope of 165 mm/m (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 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 10-1.
The condensate can also be returned to the
VAPORSTREAM VLC, as shown in figure 10-2, with an
air vent. This method requires a water seal and an air
gap to prevent back pressure from the
VAPORSTREAM VLC tank affecting condensate
returning below the VAPORSTREAM VLC water line.
Figure 15-2: Piping method recommended when
humidifier must be mounted higher than the duct
165 mm/m
Pitch
125 mm
min.
Optional SST Tubing Tee
Funnel or Floor Drain*
OM-699
15