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STE
SERIES
Installation, Operation & Maintenance Manual
10
Steam distribution
Duct injection
If your STE humidifier was supplied with duct steam
distributor pipes, they must be mounted completely level in the
duct with the steam outlet holes facing up as shown to the right.
Support the end of longer distributor pipes if needed.
Distributor pipes should be mounted per the diagrams shown
below, with a minimum of 6" from the center of the distributor
pipe to the top of the duct and 3" minimum to the bottom.
Generally the distribu-
tor pipes should be
mounted in the center
of the air stream.
Multiple pipes need to
be staggered on a
diagonal to prevent
the steam discharge
from the lower pipes
from impinging on the
upper ones.
In vertical ducts, the distributor pipes are mounted in the center
with the holes facing up as shown at right. The airflow may be up or
down, but when the airflow is down, maximum velocity is 1,500
fpm.
To install the distributor pipes:
1. Cut a key shaped hole in the side of the duct to match the steam pipe and
condensate return.
2. Apply silicone sealant to the mounting plate and insert the pipe through the
hole and secure it with 4 sheet metal screws.
3. Connect the steam and condensate hoses using the hose clamps supplied.
IMPORTANT: Allow 2 feet of straight duct downstream of the distributor pipes when the air temperature will be
>55oF. Allow 3 feet of straight duct if the air temperature will be <50oF. Always allow 2 feet upstream. Turbulent
air flow may require longer lengths.