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Ground Source Heat Pumps

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  • lovesgshp
    lovesgshp Posts: 1,413 Forumite
    Ninth Anniversary 1,000 Posts
    Well Akmodi.
    You ask a question, which either I or someone else may be able to answer with a little further info, to possibly help you save money with your system. One month later, we are still waiting, for a few simple answers.
    I have a few theories on what your problem may be, but unless you answer the questions, then I cannot help.
    As Manuel says in Fawlty Towers: " I Know Nothing"
  • akmodi
    akmodi Posts: 93 Forumite
    edited 12 February 2014 at 2:11PM
    lovesgshp wrote: »
    Well Akmodi.
    You ask a question, which either I or someone else may be able to answer with a little further info, to possibly help you save money with your system. One month later, we are still waiting, for a few simple answers.
    I have a few theories on what your problem may be, but unless you answer the questions, then I cannot help.

    HI lovesgshp,

    I must apologise, unreservedly -- family health problems, so forgot this :(. Afterall the house was warm (too expensive).

    The answers you wanted are as follows:
    Installed in 2008.
    m2: 360
    Underfloor,
    Temp: I have set the room temp at 22, water at 46
    7.1 18724
    7.2 21% DHW, 79% RAD
    7.3 2727
    7.4 26%DHW, 74% RAD
    Alarms: 130909 High delta -- this was sorted by clearing the filter.

    I promise that the replies will be near immediate now.

    Thanks for helping out
  • Hi,

    I have a general question about the systems. Is a buffer tank the same as a general water tank that you would get with a standard system boiler?

    My point is I don't think I can afford to have a GSHP installed intitially at my property so might go with a std system setup and add the GSHP to it later.

    I'm having a whole new radiator / water system installed. No option for retrofitting underfloor. I'm thinking of an unvented pressurised cylinder. I don't want a tank in the attic (no space).

    Thanks

    Rick
  • lovesgshp
    lovesgshp Posts: 1,413 Forumite
    Ninth Anniversary 1,000 Posts
    edited 12 February 2014 at 9:29PM
    akmodi wrote: »
    HI lovesgshp,

    I must apologise, unreservedly -- family health problems, so forgot this :(. Afterall the house was warm (too expensive).

    The answers you wanted are as follows:
    Installed in 2008.
    m2: 360
    Underfloor,
    Temp: I have set the room temp at 22, water at 46
    7.1 18724
    7.2 21% DHW, 79% RAD
    7.3 2727
    7.4 26%DHW, 74% RAD
    Alarms: 130909 High delta -- this was sorted by clearing the filter.

    I promise that the replies will be near immediate now.

    Thanks for helping out

    Thanks for getting back and sorry about the family health issues, hope all are well now.
    I am presuming that you have a high level of insulation, as 11Kw is quite low for 360m2.
    OK, lets start looking at the problem:
    7.1 & 7.2 are looking fine % wise.
    7.3 is very high, the DHW % especially @ 26%.

    Questions:
    Do you use a lot of DHW, especially for baths etc? The unit gives priority for that side of the system.
    Can you scroll through the alarm menu, so we can see how often the system has been alarming. My first thought on your high electric usage was regarding the filter cleaning. as that is a common reason.
    Room temperature: 22C, is quite high for underfloor. Is the temp set on the pump and if so what have you got the room temperature influence set at, to overide the external sensor?
    In the K2 menu, under the heat setting, you will see a setting up to 10. For U/F you should be no higher than 4.

    Sorry, for all the extra questions and late reply, but have been working out the options for a 150m2 + 300m2 building on one location, but thanks for getting back to me.
    As Manuel says in Fawlty Towers: " I Know Nothing"
  • lovesgshp
    lovesgshp Posts: 1,413 Forumite
    Ninth Anniversary 1,000 Posts
    RickMoney wrote: »
    Hi,

    I have a general question about the systems. Is a buffer tank the same as a general water tank that you would get with a standard system boiler?

    My point is I don't think I can afford to have a GSHP installed intitially at my property so might go with a std system setup and add the GSHP to it later.

    I'm having a whole new radiator / water system installed. No option for retrofitting underfloor. I'm thinking of an unvented pressurised cylinder. I don't want a tank in the attic (no space).

    Thanks

    Rick

    Hi Rick.
    A buffer tank is normally installed on a ASHP/GSHP radiator based system, or a combined system, to smooth out the different temperatures required.
    With what you are thinking, then you may be better getting a heat store type unit, to which you can add a heat pump input at a later date.
    HTH
    As Manuel says in Fawlty Towers: " I Know Nothing"
  • lovesgshp
    lovesgshp Posts: 1,413 Forumite
    Ninth Anniversary 1,000 Posts
    A further question Akmodi.
    I need you to go into the service menu and give me some information.
    Hold down the menu button for about 15-20 secs and then go to menu 5 service/installer. Look at sub menu 5.2 for the additional heat menu and let me know what it is. DO NOT alter any settings within that menu unless I say, as we can always revert back easily. I think you may be set at the 2/3 setting, so you are using 6Kwh as soon as the electric heater starts.
    As Manuel says in Fawlty Towers: " I Know Nothing"
  • akmodi
    akmodi Posts: 93 Forumite
    edited 14 February 2014 at 8:36AM
    lovesgshp wrote: »
    Thanks for getting back and sorry about the family health issues, hope all are well now.
    I am presuming that you have a high level of insulation, as 11Kw is quite low for 360m2.
    OK, lets start looking at the problem:
    7.1 & 7.2 are looking fine % wise.
    7.3 is very high, the DHW % especially @ 26%.

    Questions:
    Do you use a lot of DHW, especially for baths etc? The unit gives priority for that side of the system.
    Can you scroll through the alarm menu, so we can see how often the system has been alarming. My first thought on your high electric usage was regarding the filter cleaning. as that is a common reason.
    Room temperature: 22C, is quite high for underfloor. Is the temp set on the pump and if so what have you got the room temperature influence set at, to overide the external sensor?
    In the K2 menu, under the heat setting, you will see a setting up to 10. For U/F you should be no higher than 4.

    Sorry, for all the extra questions and late reply, but have been working out the options for a 150m2 + 300m2 building on one location, but thanks for getting back to me.

    Hi lovesgshp, Thanks for getting back.
    Id does look as if we use a lot of DHW -- two teenage kids !!!
    Alarm menu -- last was as above, there are many others before that -- all high delta. None after 130909
    K2 -- heat setting at 4.5
    Room temp influence set at 5
    Service menu 5.2 : 2/3

    Thanks for helping out
  • lovesgshp
    lovesgshp Posts: 1,413 Forumite
    Ninth Anniversary 1,000 Posts
    Thanks for the info Akmodi. A few more questions if you don't mind and then hopefully, we can do some "tweaking" of the system.

    Are you using the timer settings for the heating and DHW. If so for the heating, what is the setback temp and for how long? With the DHW just the off times.
    How many days is the DHW peak set at, for the sterilisation process?
    Is every room in the house constantly heated and used, or can you cut out some in the winter months?
    What size is the DHW tank?
    When next your heating comes on, please let me know the GT8-GT9 plus GT10-GT11 readings, after approx 15-20mins
    Apologies, for so many questions, as it is much easier for me to be in front of the Rego controller and look for the results.
    As Manuel says in Fawlty Towers: " I Know Nothing"
  • akmodi
    akmodi Posts: 93 Forumite
    lovesgshp wrote: »
    Thanks for the info Akmodi. A few more questions if you don't mind and then hopefully, we can do some "tweaking" of the system.

    Are you using the timer settings for the heating and DHW. If so for the heating, what is the setback temp and for how long? With the DHW just the off times.
    How many days is the DHW peak set at, for the sterilisation process?
    Is every room in the house constantly heated and used, or can you cut out some in the winter months?
    What size is the DHW tank?
    When next your heating comes on, please let me know the GT8-GT9 plus GT10-GT11 readings, after approx 15-20mins
    Apologies, for so many questions, as it is much easier for me to be in front of the Rego controller and look for the results.

    Timer : No
    Setback temp: how do I do this?
    DHW: where do I do this?
    DHW peak -- weekly : 7 days
    Rooms - constant heat, yes mostly used
    DHW: I think 300 l
    Heating -- works all the time
    GT8 --- GT11: how do I do this

    Sorry, though I have had this for a while, I have really not "fiddled" with it, so that's why the newbie questions.

    Thanks
  • lovesgshp
    lovesgshp Posts: 1,413 Forumite
    Ninth Anniversary 1,000 Posts
    akmodi wrote: »
    Timer : No
    Ok. Go into the K2 menu, and set up these options from within the timer menu. Heating off, from say Mon-Sunday 22.00 until 06.00, depending on time you like to get up, allow say 30 mins before.
    Setback temp: how do I do this?
    After setting the above, the next menu is the setback. Set this to -1.5C. This is only a flow temp, but it does help to reduce running costs.
    DHW: where do I do this?
    After you have set the above, the next sub menu on the timer will be the DHW temp. Again set to when you have the last high usage to approx 30 mins before the morning requirements.
    DHW peak -- weekly : 7 days.
    OK, lets leave that one for the moment, I have some views, but we can go over those later.
    Rooms - constant heat, yes mostly used
    OK
    DHW: I think 300 l
    OK
    Heating -- works all the time
    OK
    GT8 --- GT11: how do I do this
    In the Main Menu, go to monitor all temperatures. Just scroll through that and you will get to those readings, one after the other. I am looking for the heat deltas, but they need to be read on a heating cycle, not a DHW one.

    Sorry, though I have had this for a while, I have really not "fiddled" with it, so that's why the newbie questions.

    Thanks
    Don't worry about the newbie questions, sure we can cut the costs down somewhat.
    Just one other thing as a afterthought. You should have 2 x pressure guages, one for the underfloor heating system which should be reading about 1.5 bar, and a second for the ground loop at about 0.5 bar, if you can confirm.
    Thanks
    As Manuel says in Fawlty Towers: " I Know Nothing"
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