Technical information

9
TRANSITIONS
When adapting the duct to fit the air cleaner, use
gradual transitions in duct size to prevent
turbulence and to increase efficiency.
Duct transitions should not exceed 20 degrees
(about 4” per lineal foot) on each side of a fitting.
Fig. 5: TYPICAL INSTALLATION WITH TURNING VANES IN
AIR DUCT
OUTDOOR AIR
When outdoor air is added to the return air duct,
sufficient heat must be added to maintain a
uniform a temperature between 50°F and 125°F.
Two methods are recommended:
1. Baffles. Mixing baffles should be used to mix
the outdoor air and the return air before it
enters the air cleaner.
2.
Preheat Coil. If large amounts of outdoor air
are used, it must be heated. An appropriate
control system should be used to control the
heating element (electric strip heater, steam
coil, etc.).
Outdoor air intakes should be protected to prevent
the introduction of unnecessary contaminants.
Depending on the installation, it may be necessary
to incorporate some or all of the precautions
mentioned below:
1. Outdoor air intakes should be hooded or
louvered to provide adequate protection from
rain and snow. The type of hood used will
depend upon the installation and expected
weather.
2. Outdoor air intakes should always be
equipped with a “bird screen.”
3. At times it may be desirable to install a prefilter
ahead of the electronic air cleaner. This is
done to remove contaminants that could be
harmful to the air cleaner or might cause
excessively fast dirt buildup or arcing in the
electronic cell.
WATER DAMAGE PROTECTION
If the installation is going to be overhead, provide
a sheet metal pan with a drain under the entire
AutoClean cabinet. This is important in case of
water leaks in the ductwork or in the case of a
plugged drain.
Make certain a drainpipe of sufficient size and
slope is roughed-in to the bottom of the air cleaner
cabinet at the planned location.
AIR CONDITIONING
Make certain the cooling coil is installed
downstream from the air cleaner cabinet to
prevent condensation and chilled air (cooler than
40°F [5°C]) from entering the cell.
HUMIDIFIERS
Location of the system humidifier is important to
the operation of the air cleaner.
An evaporative type humidifier may be installed
between the furnace warm air duct and the return
air duct without affecting the electronic air cleaner.