Not enough power

[nrg]

Hi

I have a customer with a large house, workshop and pool. He is wanting to add a heat exchanger to his pool house and get rid of his oil boiler.

He has the following setup

40amp RCBO from main board - 6mm T/E to Dis Board 1

Dis Board 1 has 32amp (4mm) to Dis Board 2 (pool house)

Dis Board 2 has 16amp, 16amp, 6amp, 6amp

The issue is he has been told by his supplier of the heat exchanger that he needs to have an over current protection breaker of 40amps Type C (Hi start up current)

Can anyone give me any advice on how to get the customer what he needs? thanks

 

[Marvo]

When you say 'heat exchanger' are you referring to a heat pump or a purely electric powered heating system?

 

[nrg]

I've no idea to be honest. As far as I can work out it's like an air source heat pump with an exchanger unit to heat the pool water

eco7 | Heat Pumps | Range | Swimming Pool | Heat Pumps | Heat | Pool

 

[nrg]

eco7 Models
Model Electrical Power Heat Output
Kw (at 24c) Heat Output
Kw (at 15c) COP
RRP (not our prices !)

VA-WPH10
Single Phase 50hz 9.5kw 8.7k. 4.8-4.6 £1610
VA-WPH20 Single phase 50hz 12.5kw 9.5kw 6.5-6.2 £2080
VA-WPH40 Single phase 50hz 17.4kw 16.0kw 6.3-6.1 £3200
VA-WPH60L Single phase 50hz 27kw 25kw 5.2-5.0 £4150
VA-WPH60 3-Phase 50hz 27kw 25kw 5.2-4.55 £4150

 

[Marvo]

You're probably going to need a larger supply directly to the poolhouse from the Main board. What are the distances involved. Do you know the exact start and run current figures of the heat pump?

Edit. The heat pump would be sized according to the size and type of pool. Do you know which model has been specified?

 

[nrg]

I was going to but a 50 RCBO on the main board and upgrade the cable to 10mm and then upgrade the 32 to a 45mcb and run 10/6mm to the pool house.

The running power is 27 amps and can spike on startup to 50+ amp!

 

[nrg]

Yes the whp60L

 

[Marvo]

Three phase heat pump would be a better option at this kind of size if the house has a 3-phase supply.

 

[nrg]

I know but as with most domestic properties it's only single phase! I'm a bit stumped as to the best way forward. Thanks for the help thus far, if you have any other suggestions I'd be glad to here them.

 

[Marvo]

If it's not 3-phase supply then this is an issue. Did they consider a hybrid heat pump like a gas VRF system. I've only been involved in larger systems like these but I would imagine there's a domestic range available. This is the closest I could find with a quick interweb rummage. Sanyo air conditioners VRF air conditioning gas heat pumps

 

[nrg]

Thanks Marvo I'll take a look and see what he says