Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Electrical

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 06-16-2011, 10:45 AM   #1
Newbie
 
Join Date: Jun 2011
Posts: 7
Share |
Default

A/C wiring manual says 14 awg & 20 amp breaker?


Wiring a mini-split a/c and the manual says use a 14 awg & 20A breaker.

I ran about twenty feet of 14 awg exterior sheathed solid wire through conduit at the panel through the exterior wall and to the outside condenser unit.

...*then* I read "use a 20A breaker"

I thought I was going to use a 15A breaker.

Can I use a 20A breaker with this wiring?

This is the manual. See page #24 of the .pdf
http://us.lge.com/download/product/f...%29_011607.pdf

Can this unit operate on a 15A breaker?
See page #11 (first column unit LAN091CNP / LAU091CNP)

brianosaur is offline   Reply With Quote
Old 06-16-2011, 10:48 AM   #2
Electrical Contractor
 
jbfan's Avatar
 
Join Date: Jun 2004
Location: Newnan GA
Posts: 5,740
Default

A/C wiring manual says 14 awg & 20 amp breaker?


Follow the instructions.
14 gauge wire and 20 amp breaker.

__________________
Yes I am a Pirate, 200 years too late. "Jimmy Buffett"
jbfan is offline   Reply With Quote
The Following 2 Users Say Thank You to jbfan For This Useful Post:
electures (06-16-2011), J. V. (06-16-2011)
Old 06-16-2011, 10:50 AM   #3
Newbie
 
Join Date: Jun 2011
Posts: 7
Default

A/C wiring manual says 14 awg & 20 amp breaker?


...yeah but isn't code 12/20?
brianosaur is offline   Reply With Quote
Old 06-16-2011, 10:56 AM   #4
Electrical Contractor
 
jbfan's Avatar
 
Join Date: Jun 2004
Location: Newnan GA
Posts: 5,740
Default

A/C wiring manual says 14 awg & 20 amp breaker?


Quote:
Originally Posted by brianosaur View Post
...yeah but isn't code 12/20?
Code is follow the instructions of the manufacturer.

A/C circuits have their own rules about size and ocp
__________________
Yes I am a Pirate, 200 years too late. "Jimmy Buffett"
jbfan is offline   Reply With Quote
The Following 2 Users Say Thank You to jbfan For This Useful Post:
Jim Port (06-17-2011), SD515 (06-16-2011)
Old 06-16-2011, 11:05 AM   #5
Newbie
 
Join Date: Jun 2011
Posts: 7
Default

A/C wiring manual says 14 awg & 20 amp breaker?


ok sounds good
brianosaur is offline   Reply With Quote
Old 06-16-2011, 05:07 PM   #6
Electrician
 
Join Date: Nov 2005
Location: Winnipeg, Manitoba
Posts: 1,139
Default

A/C wiring manual says 14 awg & 20 amp breaker?


Code will also tell you to use #14 on a 20A breaker.

Your unit does not use more then 15A when it is running, but when it starts it needs the extra bit to get itself going, that is why it goes on a 20A breaker.
darren is offline   Reply With Quote
Old 06-16-2011, 05:19 PM   #7
Wire Chewer
 
Red Squirrel's Avatar
 
Join Date: Jun 2009
Location: Ontario, Canada
Posts: 3,211
Default

A/C wiring manual says 14 awg & 20 amp breaker?


Personally I would try a 15 amp breaker and if it trips then go with the 20. Seems kinda odd they would go against standard conventions though.
Red Squirrel is offline   Reply With Quote
Old 06-16-2011, 05:51 PM   #8
Electrician
 
SD515's Avatar
 
Join Date: Aug 2008
Location: Near Jackson Michigan Area
Posts: 1,450
Default

A/C wiring manual says 14 awg & 20 amp breaker?


As jb mentioned, AC’s have some different rules, and one of them is that a larger breaker can be used than you would typically for a given gauge of wire. I see your line of thinking Red Sq, but if anything should be changed, I would change to 12ga wire. You can always use a larger wire. Not that the OP has too though, as per the instructions.
__________________
Kyle

Just because you can, doesn't always mean you should
SD515 is offline   Reply With Quote
Old 06-16-2011, 07:53 PM   #9
Electrical Contractor
 
kbsparky's Avatar
 
Join Date: Sep 2008
Location: Delmarva
Posts: 3,368
Default

A/C wiring manual says 14 awg & 20 amp breaker?


The section of the Code [240.4(D)] that requires 15 Amp max on circuits fed with 14 AWG does not apply in cases of HVAC circuits.

A different section [240.4(G)] applies, where such limitations are removed.
__________________
-KB

Life is uncertain -- eat dessert first!!
kbsparky is offline   Reply With Quote
The Following User Says Thank You to kbsparky For This Useful Post:
electures (06-17-2011)
Old 06-16-2011, 09:33 PM   #10
Wire Chewer
 
Red Squirrel's Avatar
 
Join Date: Jun 2009
Location: Ontario, Canada
Posts: 3,211
Default

A/C wiring manual says 14 awg & 20 amp breaker?


Quote:
Originally Posted by SD515 View Post
As jb mentioned, ACís have some different rules, and one of them is that a larger breaker can be used than you would typically for a given gauge of wire. I see your line of thinking Red Sq, but if anything should be changed, I would change to 12ga wire. You can always use a larger wire. Not that the OP has too though, as per the instructions.
Yeah was thinking that too, but figured maybe they said 14 awg because of how the wire connects at the other end or something. But if it's just a screw terminal no reason not to just use 12awg. Or terminate at a junction box then switch to 14awg.

The way I see it, if by chance something else was added to that circuit, you don't want to overload the wire. Now this should not happen in first place, but always good to be safe.
Red Squirrel is offline   Reply With Quote
Old 06-17-2011, 06:01 AM   #11
Lic Elect/Inspector/CPO
 
Join Date: Apr 2011
Location: NJ
Posts: 369
Default

A/C wiring manual says 14 awg & 20 amp breaker?


Most Minisplits use 14 wire. It listed as a communication cable, which is listed for outside use and is sunlight resistant. Use what the mfg says to use. Some minisplit such as Fujitsu, will not work properly with splices. That info came from Fujitsu tech support.
I just had a cervice call on one of these. There was a splice. Ran new 14 communication wire and the unit worked fine.
The inside unit gets it powewr from the outside unit. There is a signal wire, which tells the outside unit when to turn on or off. This signal is dc and needs a direct connection to each unit.
NJMarine is offline   Reply With Quote
Old 06-17-2011, 09:08 AM   #12
Newbie
 
Join Date: Jun 2011
Posts: 7
Default

A/C wiring manual says 14 awg & 20 amp breaker?


It wasnt in the a/c install manual but,
I also read somewhere that a visible shutoff switch is needed near the outside unit.

Should I put one in along the cable mentioned?
brianosaur is offline   Reply With Quote
Old 06-17-2011, 12:45 PM   #13
Wire Chewer
 
Red Squirrel's Avatar
 
Join Date: Jun 2009
Location: Ontario, Canada
Posts: 3,211
Default

A/C wiring manual says 14 awg & 20 amp breaker?


I would do it just for convinience sake. Good to close it in winter so you don't accidentally turn it on from inside when it is covered.
Red Squirrel is offline   Reply With Quote
Old 06-17-2011, 03:57 PM   #14
Lic Electrical Inspector
 
electures's Avatar
 
Join Date: Dec 2009
Location: The Great Police State of New Jersey
Posts: 1,666
Default

A/C wiring manual says 14 awg & 20 amp breaker?


Quote:
Originally Posted by brianosaur View Post
It wasnt in the a/c install manual but,
I also read somewhere that a visible shutoff switch is needed near the outside unit.

Should I put one in along the cable mentioned?
I disconnect is required within site of the unit. Does not have to be fused unless nameplate requires it. A knife switch will comply.

electures is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Distance between the main breaker panel and a manual transfer switch panel jerryallie Electrical 2 09-01-2010 08:11 PM
Breaker box wiring question(s) janralix Electrical 6 08-29-2010 10:13 PM
Wiring help BenJoeM Electrical 15 10-28-2008 07:59 AM
20 Amp Breaker tripping with GFCI panhandlion Electrical 7 12-12-2007 08:59 PM
Outdoor breaker panel questions lhoney2 Electrical 12 07-19-2007 05:44 PM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.