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Heat pump low pressure

Discuss Heat pump low pressure at UK Plumbers Forums; Ps we have an A here sitting in our museum of oddities...
  1. #13
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    Default Re: Heat pump low pressure

    Ps we have an A here sitting in our museum of oddities
    quality likes this.
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    Default Re: Heat pump low pressure

    Not a bad unit mechanically its just the control is pretty limited

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    Default Re: Heat pump low pressure

    Had a quick look today before she went to work. System working and up to temp.
    System is 5 years old and had no problems until a year and a half ago. It will typically cut out on low pressure about 3 times a month.
    Previous works seems to be magna clean and auto bypass and possible flush/cleaner (info pretty vague). She mentioned they said it was one of the dirtiest he's seen.
    Checked heat pump. Only About 800mm in front of unit to next door, rear ok. Mi's ask for 1500mm so not ideal.
    Coil pretty clean, fan ok, pcb connectors seemed ok.
    System seems to be circulating fine (flow shown through ufh manifolds). Up to pressure and no air. Cleaned magna clean, not much but quite large deposits rather than the average black sludge. Ran a manual defrost cycle and no issues was about 5°c outside at which point customer had to go to work.
    Said she'll call when it next occurs.
    Still unsure as to what could be causing low pressure as it is only intermittent. The front clearance/ unit
    positioning is not good, but it was trouble free for 3 years. Tempted to give this one a miss as really not in the know with heat pump fault finding. My experience with heat pumps is fitting a couple of ecodans to a spec and that was a couple of years ago. Will pop a couple of pics up.

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    Default Re: Heat pump low pressure

    Heat pump low pressure-20160309_083849.jpg
    Heat pump low pressure-20160309_085817.jpg
    Heat pump low pressure-20160309_090951.jpg
    Heat pump low pressure-20160309_085748.jpg
    Heat pump low pressure-20160309_084223.jpg
    Heat pump low pressure-20160309_083834.jpg

    Is the discolouration on some of the coil piping normal?

  5. #17
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    Default Re: Heat pump low pressure

    Are you guys sure that unit doesn't have glycol in it??? That looks just like the A series collector, as opposed to an evaporator...
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    Default Re: Heat pump low pressure

    That is 100% a DHP AX the last 2 pictures are of the evapoartor. The ally way its installed in will not help as in cooler weather it will be like walking into a refrigerator which will not help with low pressure issues, But sound as its quite a recent issue I would suggest on the expansion valve being on its way as they do tend to hunt quite a bit because it only a standard mechanical TEV and 5 years service is pretty average life for one. I have replaced quite a few but there were only around 1200 DHP AXunits fitted in the UK
    Last edited by quality; 10-03-2016 at 07:52 AM.

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    Default Re: Heat pump low pressure

    Thanks quality will look into that. I'm a bit reluctant to look into any flow related issue as seems thats the route the previous company took with no avail.
    Will have to get our refrigerant guy to test the system. With the TEV is that something you can test or would it be better/cost effective to just change?
    Also a little confused now as to wether this system needs glycol? Manual just says fill off the mains, just a normal filling loop on system so don't think so.
    Thanks
    Last edited by SmokeyJ; 10-03-2016 at 12:38 PM.

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    Default Re: Heat pump low pressure

    Just replace it and its sorted

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