Data Aire gForce Ultra - 2.5 Locating the Unit

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2.5.1 Downow Units
Downow units will typically sit on an elevated ooring system known as a raised oor. The unit dis-
charges air downward which pressurizes the raised oor and channels upward through perforated
oor tiles. Location and quantity of perforated tiles will dictate proper air distribution. If the raised oor
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 oor has been properly sized for the unit’s airow and the room is free of airow
restrictions. Perforated oor tiles in the raised oor should ensure minimal pressure loss. The raised
oor must provide a minimum of 12” (305 mm) clearance. Ensure that there is adequate clearance
above the unit for service, such as replacing lters. Optional plenums are available for downow 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 oor or on
vibration pads.
Floorstands are also a way of supporting the unit. These are ordered to the height of the raised oor
with leveling rods to allow adjustment. The oorstand 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 oorstand
from below. Local building codes may dictate this procedure. After installation, the raised oor is typi-
cally built around the unit.
The raised oor serves as the distribution plenum for air on downow units. Cables, piping, wiring
raceways, inadequate oor height and any other restrictions can inhibit proper airow. Care should
be taken to avoid restrictions.
2.5.2 Upow Units
Upow units will typically be supported by vibration isolation pads and/or oorstands 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 eld 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 o󰀨er 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 di󰀨erent methods.
See the dap4™ User Manual for details and recommended settings.
WARNING: Do not operate upow units without installing a plenum, ductwork
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 upow 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.