46
GTS HUMIDIFIER LX SERIES INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
SEALED COMBUSTION (COMBUSTION AIR FROM OUTSIDE THE BUILDING)
• The GTS is pre-plumbed to support sealed combustion using PVC, CPVC
ABS, polypropylene, or stainless steel or piping (see Figure 46-1).
All GTS models have a single point connection on top of the humidifier
shroud.
• When running piping for sealed combustion, see Tables 48-1 and
49-1 for maximum and minimum equivalent length of vent pipe and
equivalent length of each elbow (maximum of eight elbows including
terminations). The outside air source can be either a final connection
outside the building or a connection to an outdoor air plenum within
the building. When the combustion air origination point is outside the
building, the opening must be covered with a large mesh screen to prevent
the introduction of unwanted materials without restricting airflow.
• If sealed combustion piping passes through warm, conditioned space
insulate piping to prevent condensation.
WARNING
Requirement for manifolding sealed
combustion piping runs
When installing sealed combustion
piping for more than one GTS
humidifier, do not commonly manifold
multiple sealed combustion piping
runs without having the manifold
sized for the specific installation by
a licensed engineer. Failure to follow
these instructions could starve the GTS
humidifier of combustion air resulting
in either the unit not being able to light
or high carbon monoxide (CO) levels,
which may cause severe personal injury
or death.
PVC or CPVC
combustion air intake
Flue
Tee
General venting (continued)
INSTALLATION
OM-7977
FIGURE 46-1: LX SERIES SEALED COMBUSTION CONNECTION
Combustion air intake
Flue gas vent to outside
To drain
24" (607 mm)
6" - 8"
(152 - 203 mm)
Flue gas
condensate
Note: Field piping supplied by others.
