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  1. #1

    Is Manual J and S required for ductless mini split systems in NJ?

    As an older contractor, I am having a hard time with this. Obviously, manual D would not be required, but still. Only one town in my area is asking for them now, but that will change. Any advice? Manual S would be impossible as the system revs up and down.

  2. #2
    Join Date
    Jun 2006
    Richmond, VA
    Manual j is required to determine the load on the structure. You can get manual j and do it long hand or get software (not sure how detailed you need to be in your area-there are easy programs and detailed ones). Manual s is equipment selection to handle the load determined in manual J. Doesn't matter if it revs up and down as long as it covers the max. load.
    It's not the Brand with the fewest repairs-It's all in the install!!! Attention to detail and using the best materials!

  3. #3
    Join Date
    Dec 2010
    Woodbridge Twp, NJ
    If the jurisdiction is requiring both, treat it as you would with a regular split. The manual J will give you the heat load and the manual S is simply verbage that the system is within 1/2 ton of the manual J calculation. It doesnt matter if the unit ramps up and down, you bought a 2 ton split, it's a 2 ton.
    Every customer you take for granted today will be someone else's tomorrow.

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