AC & ACCU

A

Alwayslearningelec

Senior Member
Location
NJ
Occupation
Estimator
Would an AC unit and it's associated condensing unit always be on the same circuit? Circuit info not on drawings but looking at the electrical data on mechanical schedules they each have different power requirements.

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Don't know what type of unit this is. It looks like ductless or ducted mini splits with a condensing unit. So ACCU-1 would be the condensing unit. Then it looks like you have 6 heads AC-3-1 to AC-3_6

Most straight Mini split (one condenser and one indoor unit) some are wired with separate power to each unit and some the indoor unit is fed from the condenser.

I have not wired any units with multiple heads, but I suspect they would have their own power supply separate from the condenser
 
Some systems feed the indoor head separately. Usually the plans will note this.
 
Eddie702 said:
I have not wired any units with multiple heads, but I suspect they would have their own power supply separate from the condenser
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Eddie is most likely correct. In this case they usually refer to the indoor units as cassettes and they have their own power source. It is also possible they have electric heat. Power for them should be noted on the electrical plans.
 
This appears to be a VRF system. In this case the AHU's will definitely powered from a separate circuit or circuits. The CU will be large enough to supply a zone of AHU's. There may also be what is called branch boxes in the system, these also require a separate circuit or circuits. These branch boxes have multiple ports to control the refrigerant in the system as this type of system can provide heating and cooling in the same mechanical zone.
You can put multiple AHU's and branch boxes on 1 circuit depending on the size of the units. But this should be indicated on the drawings for the project.
 
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