User Manual
HDG Series Air Handler INSTALLATION INSTRUCTIONS Heat Controller, Inc.
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9.0 AIR FILTER (not factory-installed)
• External lter or other means of ltration is required. Units should be sized for a maximum of 300 feet/
min. air velocity or what is recommended for the type lter installed.
Filter application and placement are critical to airow, which may affect the heating and cooling system
performance. Reduced airow can shorten the life of the system’s major components, such as motor,
limits, elements, heat relays, evaporator coil or compressor. Consequently, we recommend that the
return air duct system have only one lter location. For systems with a return air lter grill or multiple lter
grills, can have a lter installed at each of the return air openings.
If adding high efciency lters or electronic air ltration systems, it is very important that the air ow is
not reduced. If air ow is reduced the overall performance and efciency of the unit will be reduced. It
is strongly recommended that a profesional installation technician is contacted to ensure installation of
these such ltration systems are installed correctly.
IMPORTANT: DO NOT DOUBLE FILTER THE RETURN AIR DUCT SYSTEM. DO NOT FILTER THE
SUPPLY AIR DUCT SYSTEM.THIS WILL CHANGE THE PERFORMANCE OF THE UNIT AND RE-
DUCE AIRFLOW .
Do not operate the system without lters. A portion of the dust entrained in the air may temporarily
lodge In the duct runs and at the supply registers. Any circulated dust particles could be heated
and charred by contact with the air handler elements. This residue could soil ceilings, walls,
drapes, carpets and other articles in the house.
Soot damage may occur with lters in place, when certain types of candles, oil lamps or standing
pilots are burned.
Warning