Hvac unit

[Alwayslearningelec]

Ok, I have a HV-2(heating &ventilation unit) that shows a 3p/60a disco on the floor plans. I am looking at the schedule on the mechanical drawings and under the electrical info for that unit it says "starter type" VFD. Can you have a disco and a VFD for a unit like this or would it be one or the other?

Thanks.

 

[Alwayslearningelec]

And I know that VFD's can be loose or integral to the unit.

 

[chris kennedy]

Can you have a disco and a VFD for a unit like this or would it be one or the other?

I would look at 430.102(A) Beau.

 

[augie47]

What Chris said.

(they serve two different purposes)

 

[cadpoint]

What about a VFD that's rated as a means of disconnect?

Yes the VFD was in sight of the Breaker that controlled it.

Article 430.102 Exception (B)

Some times I seen the mech supply the VFD on bigger projects...just depends

 

[Alwayslearningelec]

Ok, just got into work and will look at my code book. Most of the time VFD's are furnished by mech and installed by us. Yes, I would assume if the VFD is not a means of disconnect then I need a disco separate from the VFD. Thanks guys for the code reference.

 

[Alwayslearningelec]

Ok, so I assume the "controller" they refer to in 430.102 id either a starter, vfd etc. They also mention "controller disconnect means". That is a disconnect switch correct? A VFD can't act as a disconnect as well, right? According to 430.103 is seems like it is separate but can be in the same enclosure. Thanks. I think I should read the code book more. I bought the 2008, tabbed it and everything but RARELY use it.