Ductwork - Trane E4AH5E24A1J30A Installation Manual

NOTES: Airflow based upon cooling performance at 230V with no electric heat and no filter. Airflow at
208V is approximately the same as 230V because the multi-tap ECM motor is a constant torque motor.
The torque doesn't drop off at the speeds in which the motor operates.
The air distribution system has the greatest effect on airflow. For this reason, the contractor should use
only industry-recognized procedures to finish ductwork.
Heat pump systems require a specified airflow. Each ton of cooling requires between 300 and 450
cubic feet per minute (CFM). Duct design and construction should be carefully done. System
performance can be lowered dramatically through bad planning or workmanship. Air supply diffusers
must be selected and located carefully. They must be sized and positioned to deliver treated air along
the perimeter of the space. Return air grilles must be properly sized to carry air back to the blower as
well. Failure to follow these may cause abnormal noise and drafts.
The installers should balance the air distribution system to ensure proper quiet airflow to all rooms in
the home. This ensures a comfortable living space. An air velocity meter or airflow hood can give a
reading of system CFM.

6. Ductwork

Field ductwork must comply with the National Fire Protection Association NFPA 90A, NFPA 90B and
any applicable local ordinance.
WARNING
Do not, under any circumstances, connect return ductwork to any other heat producing device such as
fireplace insert, stove, etc. Unauthorized use of such devices may result in fire, 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.
Fibrous ductwork may be used if constructed and installed in accordance with SMACNA Construction
Standard 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 airflow be adequate. Make sure supply and return
ductwork, grilles, special filters, accessories, etc. are accounted for in total flow resistance. Refer to
the airflow performance table 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 flexible air duct, be sure that the 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 flanges supplied with the unit. Attach flanges around the
blower outlet.
 Secure the supply and return ductwork to the unit flanges, using proper fasteners for the type of
duct used and tape the duct-to-unit joint as required to prevent air leaks.
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 flange on the unit.
The front flange on the return duct 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.
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