– 16 –
Sizing Guidelines
The following guidelines will aid in determining the
proper size unit for the space (room) allowed. These
are intended only as a guide, in order to assist in
diagnosing an over/undersized application (cooling/
humidity problem). For the reasons listed above, it is
strongly recommended that a professional engineer
be retained to match the Zoneline with the building
structure.
Supply Air Throw
One Zoneline unit should not be required to do a
job obviously requiring two or more units. Units
should be located around large rooms according
to calculated loads or in such fashion as to achieve
balanced air distribution in all parts of the room.
The single unit in the
INCORRECT
illustration below,
obviously cannot condition the entire room. Add a
second unit as shown in the
CORRECT
illustration.
Over-Sizing
If an air conditioner is oversized (cooling capacity is
greater than required for the specifi c application),
the unit will typically cool the space down to the
desired temperature (thermostat set point) too
quickly. The result can lead to “compressor short
cycling” or a room with excessive moisture/humidity
(unit does not run long enough to provide good
dehumidifi cation).
Heating
Under-sizing can result in the unit not being able to
maintain the desired temperature level within the
conditioned space.
Wall Coverings
Use of non-permeable wall covering (some paint,
some wallpapers, and other types of coverings)
which severely restricts passage of air or water
vapor, can cause a severe moisture problem.
Typical results could be staining of room surfaces,
wall damage, as well as mold and mildew growth in
hot/humid climates.
Air Infi ltration
Excessive air infi ltration can magnify problems
associated with under-sizing or over-sizing of an
air conditioner unit, and can be the root cause of
insuffi cient cooling, dehumidifi cation, or heating.
Some sources of air infi ltration include vents, gaps
around windows and doors, improperly sealed
fl oors, ceilings and wall joints.
Under-Sizing
If an air conditioner is undersized (cooling capacity
is less than required for a specifi c application), the
unit will typically not be able to cool the space down
to the desired temperature (thermostat set point).
Application and Sizing
All manuals and user guides at all-guides.com
all-guides.com
