Application Comments
Use and Care Manual and installation instructions are shipped with Zoneline® units. It is important that any air conditioning system be properly sized and applied in order to achieve the desired temperature and humidity levels with the space to be conditioned. Air conditioners are designed primarily to provide heating and cooling with the additional benefit that during operation in the cooling mode, the units also remove some moisture from the conditioned space. The following are some brief application comments on undersizing, oversizing, heating, wall coverings, and air infiltration: all are important in the proper matching of the heating/air conditioning system to the building structure.
Undersizing: If an air conditioner is undersized (cooling capacity is less than required for a specific application), the unit will typically not be able to cool the space down to the desired temperature (thermostat set point), nor be able to remove enough moisture from the air. A result could be a warm and humid or warm and dry conditioned space.
Oversizing: If an air conditioner is oversized (cooling capacity is greater than required for the specific application), the unit will typically cool the space down to the desired temperature (thermostat set point) too quickly. The compressor then begins to cycle on and off. Dehumidification only takes place when the compressor is operating. A typical result in a hot/ humid climate could be a cool but excessively humid space.
Heating: Undersizing can result in not being able to maintain the desired temperature level within the conditioned space.
Wall Covering: Use of a
High Wall Mount — For units mounted high in the wall, the discharge louvers should be at a setting that provides the most horizontal air discharge. Recommended installation is at least 3" below the ceiling.
In installations where units are close to the ceiling, the most horizontal discharge angle can be obtained by removing the discharge grill from the room cabinet.
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.
50° |
40° |
INCORRECT
Air Infiltration: Excessive air infiltration can magnify problems associated with undersizing or oversizing of an air conditioner unit and can be the root cause of insufficient cooling, dehumidification, or heating. Some sources of air infiltration include vents, gaps around windows and doors, and improperly sealed floor, ceiling and wall joints.
Recommendation: For the above reasons it is strongly recommended that a professional engineer be retained to match the Zoneline unit with the building structure.
Air Distribution
Zoneline packaged terminal air conditioners and heat pumps discharge air from the top of the unit through reversible
All room cabinets return air through the front of the unit.
OVER 40 FT.
CORRECT
OVER 40 FT.
20
