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Old 06-12-2008, 10:31 AM   #1
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tripped breaker on a/c


i just installed a 1200 btu mr slim,it ran fine for one day ,then started to trip the 20 amp breaker,it did this for 2 days then it ran fine after that.the weather was in the 90s anyone have this problem before,any thanks for any help.also i checked all the elect. fittings they were all tight.

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Old 06-12-2008, 03:31 PM   #2
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tripped breaker on a/c


That has a indoor and outdoor unit correct? Anyway what are the nameplate ratings on the equipment...

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Old 06-16-2008, 09:39 AM   #3
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tripped breaker on a/c


inside 120 volts phase 1 60hz
outside 120volts phase 1 60 hz max volt 127 ampicity 16
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Old 06-16-2008, 07:50 PM   #4
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tripped breaker on a/c


possible triping of the breaker on start up. Most units will momentarily start at higher amps on start up....20 A should have a minimum of 12 guage wire between the unit and panel..if it is a long distance (25' or more) then I would recommend installing 10 gauge wire to assist in the power loss.
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Old 06-16-2008, 07:54 PM   #5
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tripped breaker on a/c


Quote:
Originally Posted by statman View Post
possible triping of the breaker on start up. Most units will momentarily start at higher amps on start up....20 A should have a minimum of 12 guage wire between the unit and panel..if it is a long distance (25' or more) then I would recommend installing 10 gauge wire to assist in the power loss.
Thats not the problem, what would a bigger gauge wire do in stopping the breaker from tripping? I think the OP has the outdoor and indoor unit on the same breaker.
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Old 06-17-2008, 06:36 AM   #6
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tripped breaker on a/c


Some Mr. Slim ductless splits I have worked on will communicate with each other and can be wired separately or together. 20 amps does not seem out of whack for a small unit and it would seem that the unit is slightly overamping on startup. Power loss through a distance of wire will cause this,,...increasing the wire size reduces the power loss, if in fact this is the case.

Last edited by statman; 06-17-2008 at 06:40 AM.
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Old 06-17-2008, 06:44 AM   #7
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tripped breaker on a/c


it has approx. 50feet of #12 wire,both units are on the same breaker thats how this unit is made.the unit would run for approx.3-4 min. before it trips,it has not tripped since the 90 degree weather is gone. i am not on the computer sometimes for a day or two,but i will be back tosee any replies.
thanks bob p.

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