TL;DR
ACCA Manual S is the equipment-selection standard that matches a specific furnace, air conditioner, or heat pump model to the loads computed in Manual J, using the manufacturer's expanded performance data at local design conditions rather than nameplate tonnage. It sets allowable sizing ranges, typically capping cooling capacity near 115 to 125 percent of the calculated load.
What it means
ACCA Manual S is the equipment-selection standard that matches a specific furnace, air conditioner, or heat pump model to the loads computed in Manual J, using the manufacturer's expanded performance data at local design conditions rather than nameplate tonnage. It sets allowable sizing ranges, typically capping cooling capacity near 115 to 125 percent of the calculated load. The step matters because two 3-ton units can deliver very different capacity at a 95 F design day. Permit reviewers in many jurisdictions ask for the selection worksheet along with Manual J.
Where it sits in the glossary
ACCA Manual S is part of the Trade jargon group inside the ProFix Directory glossary. Browse every term in this category from the glossary index.
Why Ohio homeowners should know it
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