Air source heat pump help

[Dave Walker]

Hi i am installing my first air source heat pump with buffer vessel and would like some advice or clarifcation as to how it goes. I have put a flow setter, pressure relieve valve, isolation valve, and filling loop on to the retern from the buffer to the ashp i plan to fitt a thermometer in to this as well. on the flow there will be a thermometer isolatin valve and a line strainer hopefully this is right. my main problem is where i should fitt a expansion vessle is it between the ashp and buffer vessle or the buffer vessle and the underfloor heating? Any advice would be greatfull thanks

 

[Dave Walker]

cant anyone help me please would be nice to know if i got it right or not before i get to site tomorrow thanks

 

[eaton]

Expansion vessel would be best on return back to ashp

 

[wazzer]

what you will need is a city and guilds 2399

 

[CES]

Why?.. Is my BPEC Heat pump certificate no longer any good then?

 

[eaton]

Fine in my eyes.

 

[CES]

Just as well, I could feel a gasket being blown.. C&G 2399 will not teach anyone who is already trained in these technologies, anything new.

 

[markfxy]

you need to make sure its commissioned correctly and ensure the set point for the back up immersion is correct this is more important than positioning of the expansion vessel

 

[eaton]

I'd rather design with no back up immersion, I personally don't use them and can't stand anyone that does, do it right or don't bother.

 

[wazzer]

Why?.. Is my BPEC Heat pump certificate no longer any good then?

Not if they didn't teach you how to fit UM

 

[markfxy]

I'd rather design with no back up immersion, I personally don't use them and can't stand anyone that does, do it right or don't bother.

most heat pumps come with a backup immersion thats why its important to set the programmer so that the immersion wont come on

 

[eaton]

Ones I fit have immersion back up but the plug is pulled. No need to time it then

 

[NEGS]

Which manufacturer's heat pump are you installing? Is the heating systems rads or UFH, new-build or retrofit? How have you sized the buffer vessel? What are the required flow rates, pressure drops across the system? What's the required delta-T?

 

[eaton]

I mainly fit Samsung, fit new build but mainly existing, rads and underfloor, there's lots of variables though, don't use buffer vessel either.

 

[eaton]

Delta t of heat pump is around 5c