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HDG Series Air Handler INSTALLATION INSTRUCTIONS Heat Controller, Inc.
17
7.0 DUCTWORK
Field ductwork must comply with the National Fire Protection Association NFPA 90A, NFPA 90B and any
applicable local ordinance.
Do not, under any circumstances, connect return ductwork to any other heat producing device such
as replace insert, stove, etc. Unauthorized use of such devices may result in re, carbon monoxide
poisoning, explosion, personal injury or property damage.
Sheet metal ductwork run in unconditioned spaces must be insulated and covered with a vapor barrier. Fi-
brous ductwork may be used if constructed and installed in accordance with SMACNA Construction Stan-
dard on Fibrous Glass Ducts. Ductwork must comply with National Fire Protection Association as tested by
U/L Standard 181 for Class I Air Ducts. Check local codes for requirements on ductwork and insulation.
• Duct system must be designed within the range of external static pressure the unit is designed
to operate against. It is important that the system airow be adequate. Make sure supply and
return ductwork, grills, special lters, accessories, etc. are accounted for in total resistance.
See airow performance tables in this manual.
• Design the duct system in accordance with “ACCA” Manual “D” Design for Residential Winter
and Summer Air Conditioning and Equipment Selection. Latest editions are available from:
“ACCA” Air Conditioning Contractors of America, 1513 16th Street, N.W., Washington, D.C.
20036. If duct system incorporates exible air duct, be sure pressure drop Information (straight
length plus all turns) shown in “ACCA” Manual “D” is accounted for in system.
• Supply plenum is attached to the 3/4” duct anges supplied with the unit. Attach anges
around the blower outlet.
IMPORTANT: If an elbow is included in the plenum close to the unit, it must not be smaller than the
dimensions of the supply duct ange on the unit.
• IMPORTANT: The front ange on the return duct if connected to the blower casing must not
be screwed into the area where the power wiring is located. Drills or sharp screw points can
damage insulation on wires located inside unit.
• Secure the supply and return ductwork to the unit anges, using proper fasteners for the type
of duct used and tape the duct-to-unit joint as required to prevent air leaks.
Warning