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Procedures to Design and Install an Air Distribution
System:
As defined by the California Energy Commission, the following steps should be
followed in the design and installation of a Heating, Ventilating and Air
Conditioning (HVAC) system to ensure efficiency and comfort:
- Determine room-by-room loads and air flows using ACCA Manual J
calculation procedures (or substantially equivalent).
- Layout duct systems on the floor plan, accounting for the direction of
joists, roof hips, fire-walls, and other potential obstructions. Determine
register locations and types, duct lengths, and connections required to
required to produce layout given construction constraints.
- Size duct systems according to ACCA Manual D calculation procedures (or
substantially equivalent).
- Size HVAC equipment to sensible load using ACCA Manual S
procedures (or substantially equivalent).
- Install equipment and ducts according to design specifications, using
installation requirements and procedures from the Uniform Mechanical Code,
the Air Diffusion Council, SMACNA, California Residential Energy Efficiency
Standards (Title 24), and manufacturer' specifications; Using these
procedures, the duct systems should be substantially tight.
- Charge the system appropriately, and verify charge with the evaporator
superheat method or sub cooling method (or substantially equivalent).
- Check for proper furnace burner operation and fire-box drafting.
- Test the system to ensure that it performs properly by determining (1)
that the system is properly sized, (2) that it does not leak substantially,
and has either (3a) proper air handler fan flow, and proper plenum static
pressures, or (3b) proper room and return air flows, and proper plenum
static pressures.
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