ACCA's Manual J load calculation is part of the design process of a new HVAC system. By following the Manual J methodology, HVAC system designers are able to accurately determine the total amount of heat that is lost through the exterior of a home during the cooler months, and the total amount of heat that is gained through the exterior of a home during the warmer months. Through a series of calculations and inputs, the HVAC designer is able to analyze all aspects of the thermal characteristics of every wall, floor, ceiling, door and window. In addition, an HVAC load calculation also takes into consideration other factors such as the home's geographic location, orientation to the sun, envelope tightness, duct leakage, lights and appliances. ACCA's Manual J even calculates the amount of heat and humidity that each occupant of the house will add to the interior of the home.
Connor Air uses Wrightsoft's Right-J software, an industry leading and ACCA-approved, Manual-J load calculation program.
Right-J is currently in use by tens of thousands of contractors and HVAC designers, providing them with the industry leading load calculation tools.
A Manual-J load calculation report provides three main pieces of information regarding heating and cooling load:
These three loads are used to select a piece of machinery that fits the loads (heat losses or gains) of your home. When selecting air conditioners or heat pumps, the two cooling loads should be used. And, the selected piece of machinery should be able to supply the proper amount of BOTH latent and sensible cooling, and be less that 15% over-sized, based on the Manual-J load calculation.This will ensure your system is capable of proper dehumidification (assuming the distribution system is performing properly).