Multi motor question

[teco]

Hello, Can anyone help with this? I have a roof unit to be wired and it has been a custom built unit for the customers needs. There is five pieces of equipment built in to one unit by the factory. All have motor load of fans,compressors, etc. The factory nameplate total calls for and f.l.a. of 82.2 amps and an mca of 97 amp and an mop of 110 amps. I believe the 97 includes 125% of the largest motor. The unit runs all day. I believe I need to apply 125% for continuous load to the 97 amps which brings it to 121.25 amps. Also adding a 200 amp disconnect to keep an mop of 110 amps. The hvac contractor says this requires only a 100 amp feed. I don't agree. Any opinions would be great.
Thanks.

 

[haskindm]

It is labeled as a package and you should wire it according to the label. The manufacturer should have taken the 125% of the largest motor into account for their labeling. Is the unit listed by UL or any other testing lab?
Most a/c units are not considered continuous loads in their entirety as they cycle on and off as the thermostat demands.
Usually the values are mca (MINIMUM circuit ampacity)
and
MOP (Maximum overcurrent protection).
So as long as your conductors are good for a minimum of 97 amps and your fuse or circuit breaker is rated NO MORE than 110 amps you have installed it "according to the labeling". There is usually more of a "spread" than this, but if that is what the label says, install it that way and you should be OK. If the OP doesn't hold, it will be up to the manufacturer to come up with a solution.
There is no code violation by installing conductors larger than the minimum (it just costs you more money), but you cannot exceed the maximum overcurrent device size on the label.

 

[teco]

Thanks for the advice.