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Thread: ASHP question

  1. #21
    From what I’ve just read I need less flow, so is it essential to have a bypass to balance the pressure so it’ll work
    ta

  2. #22
    The manual says “if the stabilised pressure is under 21kg/cm2(which it is) the progressive opening of the bypass valve will allow pressure to rise”

    So, is it essential to have bypass
    Cheers guys

  3. #23
    If there's no practical way of increasing the flow through the unit and it only has a pressure switch rather than a flow switch then one way to increase the pressure would be to install a valve after it to restrict the flow. This won't increase the flow, of course, it will actually reduce it but it will increase to pressure and fool the pressure switch into believing that it has a higher flow than it has at the moment.

    Before altering the plumbing you could do an experiment by temporarily blocking the output where it returns to the pond to see if you can get a high enough pressure to operate the switch while still getting a reasonable flow rate. I leave the details of how you do that to your ingenuity.

    If that gives you enough pressure with a sufficient flow, you can fit a gate valve (seven turn type, not a cheap slide valve) so you can turn the valve to the correct restriction with no chance that it will get knocked out of position. If the experiment doesn't give enough flow and/or pressure, you will need to increase the pump size, I'm afraid.
    Last edited by Manky Sanke; 22-10-2020 at 01:02 PM.

  4. #24
    Thanks Manky/feline but I think the flow is too much according to manual. I think the only way is bypass ?

    More hassle, easy enough to do but won’t be able to get the bits today to do it

  5. #25
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    I don’t see how decreasing the flow could increase the pressure,myself, but if that’s what the manual says maybe it’s right

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  7. #26

  8. #27
    This was what I sent to their technical dept for assistance

    I’ve recently installed an azzuro 8.5 kw ASHP and plumbed/wired it in
    I can’t get the pressure between the recommended parameters of 21/35 kg/cm2
    Air temp is currently 14c and the pressure gauge (no power on) is 11.5. When the unit is powered on, pressure gets to 17.


    To get the pressure up (between 21-35) is a bypass system absolutely necessary for it to work, and for the heater to work

    this was their reply


    Don’t worry too much about pressure gauge it will often run on lower pressure during cooler months.


    Providing the fan is blowing and the heater is not icing up - Then the heater is working fine





  9. #28
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    Hi ive just installed my latest Heatpump, running a EA 10,000 pump at full whack (with restrictions in PW probably 7000 LPH in reality) and my pressure is reading at the top of the green scale. Heatpump is similiar sized to yours (9 kw). I suspect you need to up the pump capacity and make it variable.I havent fitted a bypass this time but easy to do if required.

    I had problems on my first pump and when I contacted the manufacturer they quoted much higher pump speeds than the manual states for it to run efficently. If you think about it these are swimming pool pumps and im pretty sure most swimming pools are rnuuning higher pressure/volume pumps than the average Koi pond
    9000 litre pond, block and fibreglass, BD, skimmer, Nexus 220 with Draco drum,

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  11. #29
    Well it’s been on a few hours and there’s no change in temp
    I may have to get another pump ?

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  13. #30
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    I think id go With the manufacturer. Even if the pumps speeds/pressures wrong it should be heating surely? Ie you should be getting something even if it takes a while
    9000 litre pond, block and fibreglass, BD, skimmer, Nexus 220 with Draco drum,

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  15. #31
    Update.

    just got home from work and the temps gone up from 12 to 15, so it’s working, of sorts.
    Only thing is the inlet(rear of the ASHP) has frosted over big time. I take it that this isn’t supposed to happen as air cannot now get through so it can work properly

  16. #32
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    Does it have a defrost cycle? It’s going on need one that works for a UK winter!

  17. #33
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    Hmm not so sure you have a problem, frosting up is pretty normal at low temps I think?? (it was down to 3 here last night) 12 to 15 degrees is good, they don’t work that quickly in these lower temps and are obviously less efficient. Plus that first few degrees is hardest. As feline says presumably it has an auto defrost function? (Where it goes into cooling mode) before returning to heat. Mine frosted up at least once at 0330 am this morning, I know this as I’d just finished plumbing it in and switched on!
    9000 litre pond, block and fibreglass, BD, skimmer, Nexus 220 with Draco drum,

  18. #34
    Thankyou guys

    it may well have a defrost. I’ll have to have a read up on it
    I thought these things were easier than this lol

    I've read a little bit and there’s a “forced defrost” you can initiate. I’ve done it and you could feel warm air at the back of it and frost was all gone within 40 seconds

    Im going to have to do some serious reading

    https://clikcreations.co.uk/clients/...-Heat-Pump.pdf

  19. #35
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    Mine was certainly pretty easy. An afternoon spent wiring it up and plumbing it in and it’s pretty much done it’s own thing ever since

 

 
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