What is a Manual J Residential Load calculation?

What is a Manual J Residential Load calculation?

What is a Manual J Residential Load calculation?

The Manual J calculation is a formula that identifies the HVAC capacity of a building. It might also be called an HVAC load calculation because it describes the size of equipment needed to heat and cool a building. The primary users of the Manual J calculation are HVAC installers, technicians and contractors.

How do you calculate residential heat load?

1. Take the square footage of your home.
2. Multiply that by the average ceiling height in your home.
3. Multiplied by the difference in temperature desired and the temperature outside.
4. Times a multiplier that represents that the target building is a sealed structure (.135)

How do you do a load calculation?

1. Add together the wattage capacity of all general lighting branch circuits.
2. Add in the wattage rating of all plug-in outlet circuits.
3. Add in the wattage rating of all permanent appliances (ranges, dryers, water heaters, etc.)
4. Subtract 10,000.
5. Multiply this number by .

What is ACCA Manual J load calculation?

ACCA Manual J load calculations are used by homeowners and HVAC contractors to select HVAC equipment capacities (ACCA Manual S) based on the Manual J room by room heating and cooling load results.