Specifications

7
Installation (continued)
UPFLOW DISCHARGE
In data processing facilities designed for upflow
discharge systems, air distribution is either
through a supply duct or through a discharge
plenum into the conditioned space. The same
unit location considerations for a downflow
discharge system also apply to upflow discharge
systems.
FLOORSTAND
When using a stand on raised floors, remove or
cut the flooring to fit the floor stand dimensions.
If the unit is close to a wall at the back, ensure
this gap is sealed with flooring or another type of
partition. Place the floorstand in the correct
location with the pedestals going into the
pedestal socket on the floorstand and place the
cork-rubber vibration pad under the pedestal.
Once you have positioned the floorstand and
pedestal arrangement, we suggest you put a
small amount of adhesive between the pedestal
and the pad, and between the pad and subfloor
to keep the unit from moving. Level the floor
stand assembly to within ¼” using the
adjustment nuts on the threaded pedestal legs.
Seal all the way around the upper perimeter of
the floor stand with a flexible airtight gasket or
sealer to prevent air leakage. Floorstands are
available from APC with ?1.5” adjustment range
to meet 95% of the installation requirements
without any modification to the floorstand
assembly. If necessary, the threaded rod may
be cut to meet specific installation requirements.
We suggest that the leveling nuts be put on the
rod before cutting in case the thread is burred or
damaged when cut.
PEDESTAL MOUNTS
The unit has been supplied with pedestal
sockets so that a floorstand is not necessary for
system installation. When using pedestal
mounts on a raised floor, cut the floor to fit the
unit’s frame perimeter. Level the unit to within ¼”
using the adjustable nuts on the pedestal legs.
Seal the gap between the unit and the raised
floor with a flexible air tight gasket. Use a small
amount of adhesive between the pedestal, pad
and subfloor to preclude pedestal movement.
Supply & Return Air Relief
FLOOR DISCHARGE
An adequate number of perforated panels must
be installed in the floor to allow for proper air
distribution in the conditioned space. Be sure to
allow sufficient relief near heavier heat loads.
FREE DISCHARGE
Free discharge systems provide conditioned air
to the data processing facility through a
discharge plenum with two-way adjustable
grilles located on top of the air conditioners. The
discharge plenum is shipped separately from the
AFX upflow discharge unit to facilitate handling.
After installing the unit, place the discharge
plenum on top of the unit and bolt it into place
using the hardware supplied.
DUCTED DISCHARGE
A discharge plenum is provided without air
grilles for AFX units that are connected to a duct
supply distribution system. The ducted
discharge plenum is also shipped separately
from the unit. Installation for this unit is the same
as for a free discharge unit. Ducted discharge
units should be located near the heaviest load.
GENERAL – AIR DISTRIBUTION
The AFX direct expansion unit provides full rated
air delivery at 0.5 external static pressure.
Therefore, the air distribution system (plus the
return air duct and grilles if the return air is also
ducted) should not exceed 0.5 inches wg. unless
the unit has been specially ordered for an
increased air pressure drop.