
DRI-STEEM GTS Humidifier Installation, Operation, and Maintenance Manual • Page 31
Sealed combustion
The GTS supports sealed combustion using 4" (DN100) PVC or
CPVC piping (see Figure 31-1). All GTS models have a single
point connection to the blower below the humidifier shroud.
When running PVC or CPVC piping for sealed combustion,
the maximum allowable distance to the outdoor air source is 70'
(21.3 m) including 7' (2.1 m) equivalent length for each elbow.
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 is less than 20 ft (6 m), we recommend
insulating piping to prevent condensation.
C o m b u s t i o n a n d v e n t i l a t i o n a i r
( c o n t i n u e d )
Figure 31-1:
GTS optional sealed combustion connection
4" dia. (DN100) PVC
or CPVC combustion
air intake
OM-1225
W A R N I N G !
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.
Installation
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