Circuit Breaker needed for Split Air-con with Inverter

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• Mar 31, 2019

• #2

Johnny Swails said:

Hello all. I´m installing a new multi split Air Conditioning (Inverter Type) in my dwelling and I have to purchase all of the electrical parts needed for the installer. I am currently running a 63a Type-A RCCB and I was told by the electrician that I could use the Type-A with a 16a Type-C MCB but according to my research, I need to upgrade to a Type-B RCCB. Does anyone have any experience in this?

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Do you not trust your Electrician Johnny? Rather that get the stuff yourself, you ought to let him supply and fit what is required, German Engineering is very good.

 

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• Mar 31, 2019

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He is a friend and commercial electrician. He is quallified up to 1k Volts I believe he said but he told me that he has not done any residentual electrical work and that leaves me to doing the reasearch. If neccesary, I will call another electrician out but I was hoping to find a simple solution.

 

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• Mar 31, 2019

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The manual that came with the unit is not very discriptive and just states: ELCB that can handle harmonics > MCB 16-A > Outside Unit

 

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TJ Anderson

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• Mar 31, 2019

• #5

Johnny Swails said:

Hello all. I´m installing a new multi split Air Conditioning (Inverter Type) in my dwelling and I have to purchase all of the electrical parts needed for the installer. I am currently running a 63a Type-A RCCB and I was told by the electrician that I could use the Type-A with a 16a Type-C MCB but according to my research, I need to upgrade to a Type-B RCCB. Does anyone have any experience in this?

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You need to know the load of the unit and then size circuit protective devices and cable. Ask the Electrician what supply they require.

 

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TJ Anderson

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• Mar 31, 2019

• #6

Just read your last. You need the know the demand of the unit before you can do anything.

 

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Johnny Swails

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• Mar 31, 2019

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• Mar 31, 2019

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TJ Anderson

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• Mar 31, 2019

• #9

Johnny Swails said:

The manual that came with the unit is not very discriptive and just states: ELCB that can handle harmonics > MCB 16-A > Outside Unit

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Assume it is single phase.

Not sure what the regs are in Germany. Over here that would get a 30ma 61008 RCD (>16A) in series with a 60898 C16 or instead a 61009 C16 RCBO would be the order of the day.
2.5 or 4mm circuit conductors dependant on PFC at origin, install method, length of circuit, VD etc.
As I said don't know German regs. We would not normally protect AC on RCD over here unless absolutely forced to by install method.

 

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TJ Anderson

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• Mar 31, 2019

• #10

Lol. I'm too late again. Yes 12.2A single phase.

How far are you running it from supply and how will cable be run?

 

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Johnny Swails

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• Mar 31, 2019

• #11

I have run an 8-9 Meter 3x2.5 cable through installed cable canal from the main power box to outside unit

 

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• Mar 31, 2019

• #12

Daikin kit is amongst the best, so good choice of brand.
You'll need an IP67 rated rotary isolator beside the outdoor unit, to isolate the whole system.
The indoor unit takes its 230V from the outdoor unit and you'll have an FCU beside the indoor unit for local isolation.
As already stated, installation method and rating factors must be considered, also depending on how the cable to the outdoor isolator will be routed may influence the cable selection (i.e. avoiding exposed T/E outdoors)
Type C protective devices are usual for this equipment, due to the inrush current on startup.

 

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Toneyz

• Mar 31, 2019

• #13

Has your consumer unit not got an RCD in it already?

 

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• Mar 31, 2019

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Agree with C16 either MCB or RCBO depending on whats up front. This system looks like a 2 room multi-split with both rooms indoor units powered from a 3C+ earth direct to outdoor unit. I personally do not use indoor local isolation as there is little point, you still need to isolate the compressor before working on it. So i cable direct using YY cable. Daikin are the Daddy, R32 gas is the new stuff bit more flammable than R410A so have it serviced regularly.. .....

 

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• Mar 31, 2019

• #15

anthonybragg said:

Has your consumer unit not got an RCD in it already?

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We have a 63a Type -A RCCB installed now but I don't think that it'll handle inverter load

 

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