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Thread: Help needed to unblock ASHP
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13-02-2019, 06:58 PM #1
Help needed to unblock ASHP
The flow out of my ASHP is dropping off over the last few weeks. I’ve checked the flow from the pond and that’s fine, so it looks like there’s a blockage inside the ASHP.
any ideas how I can clear the blockage ?
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13-02-2019, 07:04 PM #2
maybe disconnect it and flush it through backwards ?
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13-02-2019, 07:35 PM #3
What's the usual way to pipe these up.
Is it pond water straight in or does a seperate stainless steel heat exchanger get piped up?
Asking from the point of view of a gas engineer, if pond water went direct through a boiler it would block up quickly and the pond water be in contact with metals that would not be good for the fish.
Wonder if there's a comparison??
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13-02-2019, 08:15 PM #4
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13-02-2019, 09:12 PM #5
There is very little inside the heat exchanger of a heat pump. Most designs are just a jacket with a heating coil or a concertina thingy so, if you disconnect the pipework from the heat pump unions, you should be able to see inside or at least poke a curtain wire into it and find out if there is any blockage. It isn't flimsy so you won't break anything unless you're brutal.
Must dash, dinner's ready but if you get any problems, I'll look in again tomorrow.
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13-02-2019, 10:30 PM #6
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13-02-2019, 11:00 PM #7
Is there a filter that might need unblocking? I just had a feeling I read about one needing to be unblocked from time to time in a troubleshooting section.
6000g in ground koi pond
+3000g lily/Anoxic pond attached
29 koi (40 to 65cm)
Bottom drain, Mid water & Skimmer to Drum
JBR boichamber->Blue eco 500 pump ->below surface return.
Blue Eco 240 -> Large MB -> Waterfall -> Planted Anoxic pond (25 baskets)
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13-02-2019, 11:04 PM #8
It’s a Hydro-Pro Inverter and there’s no mention of a filter in the manual.
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14-02-2019, 11:18 AM #9
Pip,
In all the years I've played with heat pumps of just about every manufacturer and model available in the UK I've never seen a one with an inbuilt filter. There is no reason for one to be installed since they are designed to be fed with a high flow rate of filtered water. There isn't anything in the heat exchanger that could block anyway so the restriction of a filter inside it would be counter productive.
Heat exchangers are just as in the diagram above - an empty box that the water flows through where it can pick up heat from a coil or finned thingy that is connected to the compressor circuit.
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Andy1671 Thanked / Liked this Post
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14-02-2019, 06:22 PM #10
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Manky Sanke Thanked / Liked this Post
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14-02-2019, 06:29 PM #11
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14-02-2019, 06:32 PM #12
Last edited by Manky Sanke; 14-02-2019 at 06:37 PM.
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Scamp Thanked / Liked this Post
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14-02-2019, 09:07 PM #13
I would be checking for restrictions elsewhere, basket pre filter perhaps, pump would be well worth a look, has it been cleaned lately, can get a coating of crud on the impeller affecting the performance.
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15-02-2019, 10:04 PM #14
Indeed - this is what I would look for first - pump blockage - as Manky correctly pointed out, heat exchanger of any ASHP is only SST or Titanium coil inside plastic or SST jacket - so reversing the flow through cleans it easily - I need to do it once every two years or so - as I feed it from mid water pump w/o any prefilter other than pump's cage with 8mm holes in it.
There is also flow sensor inside - which blocks easily - should be cleaned carefully - as if stucked, ASHP will switch off automatically to prevent damage.You get what you pay for - or better - what you make yourself.
Aquaforte Dm vario 20000 pumps
Still for sale. Postage available for cost Sent from my SM-S901B using Tapatalk