Product Details
Manual LLH deals with the unique HVAC design issues associated with homes that exhibit low cooling and /or heating loads (per Manual J® load calculations) and identifies equipment options / approaches to address these issues. The manual augments the explicit instructions provided in the ACCA residential HVAC design process … load calculations, duct design, equipment selection, grille/register selection and placement, zoning, and dehumidification for residential applications; per the underlying ACCA Manuals J® / D® / S® / T® / Zr® / SPS® / RS®.
Part 1 of Manual LLH addresses the specific challenges associated with using small tonnage HVAC systems that are needed in low load homes:
Part 2 of Manual LLH illustrates six ‘example solutions’ using representative equipment offerings available today:
Manual LLH Part 3 appendices provide ancillary details and information to support application of the core issues and concepts. The overarching intent is to provide HVAC practitioners with a contractor / designer / installer friendly presentation that succinctly deals with core concepts and provides easy to follow guidance.
- small duct high velocity (SDHV) equipment,
- ductless mini-split equipment,
- fan powered mixing boxes,
- air-zoning dampers for capacity deployment,
- engineered bypass air,
- conventional OEM equipment and ductwork with supply air nozzles.
- low equipment airflows (a room air mixing challenge),
- increased home ventilation requirements (an equipment selection challenge),
- equipment low latent capabilities (an equipment selection challenge),
- higher than normal latent needs (an indoor humidity control challenge).