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21-01-2009, 04:18 PM #1
MSZ GB50VA Requires a 25Amp BS88 Fuse?
Can some please clarify the following for me: A Mits MSZ GB50VA apparently requires a 25Amp BS88 fuse. I was intending to fit it to a 20AMP MCB, as this appears sufficient to me.
I called the Mits technical helpline, and was informed that if I don't connect it to a 25AMP BS88 fuse it would void the warranty??? I think this is a nonsense as to how it would void the warranty, but would anyone kindly confirm whether a 20Amp B type MCB would be okay?
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21-01-2009, 06:23 PM #2
Re: MSZ GB50VA Requires a 25Amp BS88 Fuse?
I don't know where the 25A came from.
Looking at http://www.orionairsales.co.uk/mitsu...rter-233-p.asp
it says it requires a 16A HRC fuse, so your 20A MCB might be over generous.
I would try a 16A MCB (B curve) first of all....if you experience tripping you could then try changing to a C curve. Its only got a starting and running current of 5A so I doubt that you should have problems. A lot of these small inverter units will happily run on a 13A spur.
Don't forget an outside isolator switch.
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21-01-2009, 07:02 PM #3
Re: MSZ GB50VA Requires a 25Amp BS88 Fuse?
Thanks for the reply, but the Mits website and tech support say different to your link (i tried pasting the link but it won't let me because i am new to here)
I will go ahead with the type B 20amp mcb, and thanks again.
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21-01-2009, 07:31 PM #4
Re: MSZ GB50VA Requires a 25Amp BS88 Fuse?
A 20A MCB will be fine for a MSZ-GB50VA.
We recently installed 5 MSZ-GA71VA where 5 R22 6kW panasonics had been.
The existing supplies were run in 2.5mm SWA and fused at 16A!
Just outa curisoty we left them as is and 1 year later there have been no problems with overcurrents.
Most A/C manufactures way overstate elctrical requirements.
Your better looking at the min & max amperage draws on the pdf spec sheets.
He who dies with the most Toys, WINS!
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21-01-2009, 07:35 PM #5
Re: MSZ GB50VA Requires a 25Amp BS88 Fuse?
Remember also that the fuse/mcb is there to protect the cable not the item of equipment at the end of it.
Brian - Newton Abbot, Devon, UK
Retired March 2015
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21-01-2009, 07:53 PM #6
Re: MSZ GB50VA Requires a 25Amp BS88 Fuse?
The max running current of the model 50 is 16amp so a 20amp would be the minimum you would fit