Downflow Units; Upflow Units - Data Aire gForce Ultra Installation, Operation And Maintenance Manual

2.5.1 Downflow Units

Downflow units will typically sit on an elevated flooring system known as a raised floor. The unit dis-
charges air downward which pressurizes the raised floor and channels upward through perforated
floor tiles. Location and quantity of perforated tiles will dictate proper air distribution. If the raised floor
is strong enough to support the unit and local codes permit, the unit can be placed directly on top with
cutouts made for the discharge openings.
Verify that the raised floor has been properly sized for the unit's airflow and the room is free of airflow
restrictions. Perforated floor tiles in the raised floor should ensure minimal pressure loss. The raised
floor must provide a minimum of 12" (305 mm) clearance. Ensure that there is adequate clearance
above the unit for service, such as replacing filters. Optional plenums are available for downflow unit
ducting.
There may be additional support required in the form of adjustable jackstands. These are adjustable,
threaded leveling rods which support the unit in each of the corners and in the center on longer length
units. Tighten the locknuts provided with each jackstand. The base plate can rest on the floor or on
vibration pads.
Floorstands are also a way of supporting the unit. These are ordered to the height of the raised floor
with leveling rods to allow adjustment. The floorstand has lips in each corner to align with the unit
which is placed on top. It is recommended that the unit frame be bolted or screwed to the floorstand
from below. Local building codes may dictate this procedure. After installation, the raised floor is typi-
cally built around the unit.
The raised floor serves as the distribution plenum for air on downflow units. Cables, piping, wiring
raceways, inadequate floor height and any other restrictions can inhibit proper airflow. Care should
be taken to avoid restrictions.

2.5.2 Upflow Units

Upflow units will typically be supported by vibration isolation pads and/or floorstands which may also
include leveling screws. An air discharge plenum may be factory provided which ships loose and must
be attached at the top of the unit frame. For in-room applications with supply and return grilles, several
feet of clearance must be maintained at the intake and discharge of the unit.
Alternately, an air distribution plenum must be field fabricated with supply grilles to distribute the air. If
a common plenum is utilized to connect the supply air for distribution from multiple units, it is recom-
mended that isolation backdraft dampers be installed on the discharge end of the unit or somewhere
prior to the common plenum to prevent cold discharge air from entering units that may be on standby.
Alternatively, we offer an AireSeal option which keeps the EC fans running at a selectable speed
between 20-50% when the unit is in standby to prevent air from entering the units from the common
plenum. Units are shipped with Electronically Commutated (EC) motors often referred to as "plug
fans". Fan speed is factory set based on order. Fan speed can be changed in 1% increments through
the unit's microprocessor controller, Data Alarm Processor 4™ (dap4™) by several different methods.
See the dap4™ User Manual for details and recommended settings.
WARNING:
or guard over the fan opening(s) on the top surface of the cabinet. Ductwork
must be connected to the fan(s), or a plenum must be installed on the top of
the cabinet for protection from rotating blower wheel(s) on upflow units. Risk
of high-speed moving parts can cause injury or death. Disconnect all local
and remote electric power supplies before working in the unit.
Do not operate upflow units without installing a plenum, ductwork
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