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Today I connected and comissioned a Dimplex Ground Source Heat pump (don't ask the model I never noted it)
So go through the manual section called "electrical connections". Make ALL the connections listed. Power, connection to various pumps and some sensors. Turn on. NOTHING.
Scratch head. Read manual again. Then find a microscopic "wiring diagram" (not referenced in the text) that shows it needs a separate control power feed. No mention of that in the text.
Connect control power, turn on again. Display comes up in GERMAN. Look at manual. Language setting is about 3 levels deep into the menu structure. Spend 20 minutes reading what the display says in German, finding that in the German section of the manual, then cross referencing the same page and paragraph in the English section of the manual to find out what it means so I can progress to the next menu level.
Now we have it in English, there's a message telling me it's inhibited due to a named input, and it helpfully suggests I link said input to 24V (no mention of this input in the manual or wiring diagram)
EVENTUALLY the thing turns on and runs for about 5 minutes before tripping with "Low Pressure. HP Fault"
That fault in the manual just says "call your installation technician" So I search for a phone number. Nope, no phone number or ANY contact information in the installation manual.
Phone supplier (builders merchant) and he is able to give me a phone number.
Having got through to them I have to say they were very helpful. The fault I described usually means there's not enough flow rate on the brine circuit and it's on the point of freezing the brine. So time to check the (yes you have guessed it DIY) plumbing.
One look behind the unit tells it all. The pipe on the brine circuit comes up, round a big U then down to the pump. and yes, no bleed point in the top of the U so no way of bleeding that part of the brine circuit. So there's probably a big air lock and no flow at all.
So that's how I left it, for the "plumber" to sort out his plumbing on the assumption it will all start working when he gets the brine flowing.
I have to say it was a neat looking unit and very modular and versatile (though understanding all the features with such a rubbish manual may be challenging) But it was also very noisy, which confirms my belief that if I use one on my next house it must go out in the garage, it's far too noisy so contemplate having in the house.
So go through the manual section called "electrical connections". Make ALL the connections listed. Power, connection to various pumps and some sensors. Turn on. NOTHING.
Scratch head. Read manual again. Then find a microscopic "wiring diagram" (not referenced in the text) that shows it needs a separate control power feed. No mention of that in the text.
Connect control power, turn on again. Display comes up in GERMAN. Look at manual. Language setting is about 3 levels deep into the menu structure. Spend 20 minutes reading what the display says in German, finding that in the German section of the manual, then cross referencing the same page and paragraph in the English section of the manual to find out what it means so I can progress to the next menu level.
Now we have it in English, there's a message telling me it's inhibited due to a named input, and it helpfully suggests I link said input to 24V (no mention of this input in the manual or wiring diagram)
EVENTUALLY the thing turns on and runs for about 5 minutes before tripping with "Low Pressure. HP Fault"
That fault in the manual just says "call your installation technician" So I search for a phone number. Nope, no phone number or ANY contact information in the installation manual.
Phone supplier (builders merchant) and he is able to give me a phone number.
Having got through to them I have to say they were very helpful. The fault I described usually means there's not enough flow rate on the brine circuit and it's on the point of freezing the brine. So time to check the (yes you have guessed it DIY) plumbing.
One look behind the unit tells it all. The pipe on the brine circuit comes up, round a big U then down to the pump. and yes, no bleed point in the top of the U so no way of bleeding that part of the brine circuit. So there's probably a big air lock and no flow at all.
So that's how I left it, for the "plumber" to sort out his plumbing on the assumption it will all start working when he gets the brine flowing.
I have to say it was a neat looking unit and very modular and versatile (though understanding all the features with such a rubbish manual may be challenging) But it was also very noisy, which confirms my belief that if I use one on my next house it must go out in the garage, it's far too noisy so contemplate having in the house.
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