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STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
The Mini-bank humidifier is a pre-engineered and pre-
assembled header/tube assembly with tubes that are always
3" (76.2 mm) on center. The number of tubes depends upon
the duct height. For best mixing, the tubes should span at
least 90% (preferably 100%) of the duct width.
1. Unpack shipment and verify receipt of all components
with packing list. Two F&T traps and one wye strainer are
shipped loose for field installation. Report any shortages
at once.
2. The Mini-bank can be configured to discharge steam
against or with the airflow: Position the tube bank
assembly at the desired orientation, slide the tube bank
through the opening in the duct wall, join the tube bank
assembly to the separator/valve assembly, and tighten
the union.
3. Slightly better mixing with less “fog travel” results when
the steam blows against the airflow. If the insulated jacket
option has been supplied, the steam must blow with the
airflow to avoid steam contacting and condensing on the
metal jacket.
4. If a field change is necessary, loosen the union, and
rotate the tube bank manifold, and tighten the union.
5. Install the Mini-bank humidifier in the duct, positioning
the assembly so the tube bank is perpendicular to the top
and bottom of the duct and level across the duct. Support
the dispersion tube bank out-board end with a No.
10-32 bolt. To secure the Mini-bank escutcheon plate air
tight, seal around the plate and fastener with suitable
caulk.
6. Install the steam strainer, taking the steam supply to the
Mini-bank humidifier off the top of steam main (instead of
the side or bottom) to ensure the driest steam. The main
should be dripped and trapped. See “Pressurized steam
piping guidelines” on Pages 10 – 13.
7. Locate and install the steam traps as necessary. The
Mini-bank humidifier steam traps should drain by gravity
to return main having little or no back pressure. If
condensate cannot drain by gravity, it must be elevated
to return main (see Page 11).
Continued
Assembly and installation
MINI-BANK HUMIDIFIER
For more installation information
• See “Humidifier placement” on Pages
6 – 8 for information about choosing
an installation location.
• See “Sensor placement” on Page 9.
• See “Pressurized steam piping guidelines” on
• See “Temperature switches” on Pages
WARNING
Improper mounting hazard
Mount humidifier per the instructions in this
manual and to a structurally stable surface.
Improper humidifier mounting can cause
the humidifier to fall resulting in severe
personal injury or death.
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WARNING
Excessive moisture hazard
DriSteem strongly recommends installing
a duct airflow proving switch and a
duct high limit humidistat. These devices
prevent a humidifier from making steam
when there is low airflow in the duct or
when the RH level in the duct is too high.
Failure to install these devices can result
in excessive moisture in the duct, which
can cause bacteria and mold growth or
dripping through the duct.
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