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Label or the manual #213825 08/02/14 10:48 AM
Joined: Jul 2004
Posts: 9,439
G
gfretwell Offline OP
Member
An interesting issue came up over on one of the Usenet groups

There is a Sea Breeze mini split air conditioner that has an installation manual that says it should be connected with 6 gauge copper. The label says "minimum circuit ampacity" is 26 amps. So who do you believe?
The breaker size is 50a.
http://www.irproducts.biz/documents/SB-NewMultiZone.pdf


Greg Fretwell
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Re: Label or the manual [Re: gfretwell] #213826 08/02/14 11:19 AM
Joined: Apr 2002
Posts: 7,133
HotLine1 Offline
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Greg:
Well, in the real world....the nameplate wins. I would rarely see an install manual; I would ask for it if I had a question, and hope the HO had it.

They may have sized the branch circuit based on the OCP?



John
Re: Label or the manual [Re: gfretwell] #213827 08/02/14 12:11 PM
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G
gfretwell Offline OP
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Quote
They may have sized the branch circuit based on the OCP?



Clearly that is what happened. ... in the 60c column


Greg Fretwell
Re: Label or the manual [Re: gfretwell] #213829 08/03/14 12:57 AM
Joined: Oct 2000
Posts: 2,720
Scott35 Online Happy
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Curiosity query...

What was the Intensity level of Flames emitted (by the Usenet Members), when the reply Message stating:
"#10 THW Cu. is Adequate and Compliant"
was posted to the Thread???
laugh yay rolleyes bash

--Scott (EE)


Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!
Re: Label or the manual [Re: gfretwell] #213830 08/03/14 01:04 AM
Joined: Jul 2004
Posts: 9,439
G
gfretwell Offline OP
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One guy in particular still will not let it go.

They are off on a "continuous load" side track now.
I tried to explain that motor circuits already have the 125% of FLA requirement and this would be part of the minimum ampacity calculation.

I explained I would trust the engineer who did that calculation more than a tech writer who might not have English as his first language.


Greg Fretwell
Re: Label or the manual [Re: gfretwell] #213844 08/11/14 07:28 PM
Joined: Feb 2006
Posts: 3
A
anothermarty Offline
New Member
Label for outdoor unit only... all the inside coils grab power from the outdoor unit.

Now why its ok to use 14/3 or4 between inside and outside can start another argument smile

Re: Label or the manual [Re: gfretwell] #213845 08/11/14 09:54 PM
Joined: Apr 2002
Posts: 7,133
HotLine1 Offline
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Correct me if this is wrong....
The inside unit (fan coil) is fed from the outside unit (condenser) and there is factory OCP for the fan coil feed within the condenser.

Most of the units I have seen have 'factory' wiring from the Cu to the FC.



John
Re: Label or the manual [Re: gfretwell] #213846 08/12/14 12:15 AM
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G
gfretwell Offline OP
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I have 2 of these mini splits and one the inside units runs on low voltage that could be run with bell wire Spec'ed as thermostat cable. It is a very small load (a little fan and an electronic board).
The other uses line voltage but just at a few amps.


Greg Fretwell
Re: Label or the manual [Re: gfretwell] #213847 08/12/14 01:06 AM
Joined: Feb 2006
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A
anothermarty Offline
New Member
A few amps x 4-5 inside line voltage coils adds up Read the specs 3.5x up to 5 so about 17 amps total inside plus 26 out 50 amps seems right


Re: Label or the manual [Re: gfretwell] #213848 08/12/14 12:01 PM
Joined: Jul 2004
Posts: 9,439
G
gfretwell Offline OP
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The conductors going to each inside unit only carry the current to that unit. That is why they can be #14.
As for the outside unit, that is specified on the label and you have to trust the engineer who computed it.


Greg Fretwell

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