That is pretty much a slam dunk at that point, no matter if there is some local rule or not. You are required to use the manufacturer's installation instructions and on things like MOCD, it could easily be a safety issue. You could make the manufacturer happy if you just used a breaker or a fused disconnect as the local disconnecting device and still have a 20a circuit tho. We see that a lot on AC replacement units when they specify a lower MOCD than the original unit so they just change the breaker in the disconnect. Since you say they are using a snap switch there it would have to be the branch device in the panel.
Last edited by gfretwell; 04/26/19 06:18 PM.