How many amps would this heat pump draw?

[Custom45]

Hi,
Looking at going all electric for our heating. Live in a bungalow with good levels of insulation (400mm in loft, 60mm PIR in walls). 100a main fuse, single phase supply.

Looking at the Daikin Stylish range of heat pumps and indoor units, it's a large bungalow and we'd need 2 outdoor units running 8 indoor wall units between them, so 2 of these kits...

Daikin Air conditioning Multi 1 x 4MXM80A 4 x FTXA25AW 2.5Kw Wall Stylish Heat Pump R32 A+ 240V~50Hz

Daikin Air conditioning Multi 1 x 4MXM80A 4 x FTXA25AW 2.5Kw Wall Stylish Heat Pump R32 A 240V 50Hz This Kit Includes 1 x 4MXM80A Inverter

www.orionairsales.co.uk

but I'm struggling to figure out how many amps these would draw when running at full power for heating (wouldn't use cooling much)?

Will be getting a heating engineer in but want to do my homework first to find out if this system is actually feasible before making any calls.

Cheers

 

[Murdochcat]

What does the manufacturers information say about supply requirements

 

[Harry Bloomfield]

but I'm struggling to figure out how many amps these would draw when running at full power for heating (wouldn't use cooling much)?

Will be getting a heating engineer in but want to do my homework first to find out if this system is actually feasible before making any calls.

10 to 12amps, but will the heat output of that unit, be adequate for a bungalow?

 

[SUNRAY]

I believe the 2.5KW mentioned is the heating power rather than the electrical power and they very carefully omit to show the electrical power in the spec sheet.

I have had dealings with many of these types of unit but I think only involved with electric power aspect once. It was a 3½ KW ASHP for a swimming pool which would trip the 16A RCBO which everyone assumed was on the RCD part (as it was outdoors), However I current tested and it was way over 16A.

 

[Moss5]

https://www.daikin.eu/content/dam/d...450-1_2019_10_Installation manual_English.pdf

 

[Why Not Indeed]

want to do my homework first to find out if this system is actually feasible

What do you mean by "feasible"? Even two of those systems is unlikely to max out your 100A supply!
Have you tried estimating what your heating needs actually are?

 

[Custom45]

https://www.daikin.eu/content/dam/document-library/installation-manuals/ac/split/3MXM-N, 3AMXM-M, 3AMXF-A, 3MXF-A, 4MXM-N, 5MXM-N_3PEN600450-1_2019_10_Installation manual_English.pdf

Thanks for the replies.

This was the bit I was struggling with Moss, I understood that as needing 4mm² cable run from a 32a breaker on consumer unit. So does that mean with 4 wall units connected the total draw won't be above 32a if all 4 are running same time?

 

[Custom45]

What do you mean by "feasible"? Even two of those systems is unlikely to max out your 100A supply!
Have you tried estimating what your heating needs actually are?

Feasible as in would 2 outdoor units and 8 indoor units draw too many amps for our electric supply to cope with.

Roughly, yes. We have an existing (older) Daikin unit running one of these wall units, it's a 2kw model in the dining room (one of the larger rooms in the property). Does a fairly good job at heating that room (28m²), the room currently has no wall insulation and only 100mm loft insulation (I'm in process of renovating and adding loft and wall insulation), so I reckon with extra insulation a slightly larger 2.5kw model will do a good job.

 

[Why Not Indeed]

There are specific tools for estimating required heat pump capacity so I would start there.

 

[Custom45]

There are specific tools for estimating required heat pump capacity so I would start there.

Yep, will be getting an engineer out to do all of this, but I don't want to waste anyone's time if this system isn't doable in terms of what it'll require from our electric supply.

 

[JohnW2]

Yep, will be getting an engineer out to do all of this, but I don't want to waste anyone's time if this system isn't doable in terms of what it'll require from our electric supply.

Your electrical supply (100A) is as large as any single-phase domestic installation, so if the demands on the supply were too large for your bungalow' supply, then these things would not be usable in the vast majority of domestic buildings.

 

[Harry Bloomfield]

Your electrical supply (100A) is as large as any single-phase domestic installation, so if the demands on the supply were too large for your bungalow' supply, then these things would not be usable in the vast majority of domestic buildings.

Another point to consider, is how does the OP know he has a 100amp supply? No point in just reporting what is marked of the fuse carrier.

 

[JohnW2]

Another point to consider, is how does the OP know he has a 100amp supply? No point in just reporting what is marked of the fuse carrier.

Well, I suppose I tend to believe what people tell us - but, as you say, he might well not know for sure.

However, that's not really the point I was making. His concern appeared to be that even if it is a 100A supply (which is obviously what he thinks/believes), it may not be adequate for his heat pump - but, as I said, if that were the case, such heat pumps would not be usable in the great majority of domestic buildings!

 

[Custom45]

It says 100a on the fuse.

I get that these are designed for domestic properties, but do all domestic properties require 2 outdoor and 8 indoor units, possibly not, so yes my concern is is this too much for the average property?

 

[Harry Bloomfield]

I get that these are designed for domestic properties, but do all domestic properties require 2 outdoor and 8 indoor units, possibly not, so yes my concern is is this too much for the average property?

Much also depends on your other loads, EV charger, water heater, electric ovens etc..