Ground Source Heat Pumps

lovesgshp

Hi again.
Don't give up!!
You can refill the expansion tank when the pump is running, so not a problem.
The smaller round tank is a buffer tank which will be at a higher temperature due to it being a combined UFH/Rad system. That is why there is another circulating pump above.
It looks like you do have air bleeds in the system, so no need to worry about them.
Please give me GT1 to GT11 readings again after a operating time of approx 10 mins on the heating cycle with the system still operating and also all the alarms showing over the last few weeks.

DeeWestern

Thanks for the motivation!

Will get you the GT1/11 readings tomorrow.

Do you think the air bleeds are somewhere else, or do you mean I don't have them?

lovesgshp

If you look at the picture of the top of the main tank, then they look like the air bleeds. They do not look automatic, but one that you have to open manually.

lovesgshp

On another point, look at the air bleed on the top of the DHW tank. It is on the front right hand side of the picture. Open it slowly and bleed out any air until only water comes out.

DeeWestern

lovesgshp wrote: »

On another point, look at the air bleed on the top of the DHW tank. It is on the front right hand side of the picture. Open it slowly and bleed out any air until only water comes out.

Sorry for the double checking (appreciate its annoyance) but to clarify, I should use a spanner to open the nute in the front right side of the DHW tank picture (marked 'Anode') next to the mains input and DHW output pipes. Once water comes out, tighten the nut again.



All OK?

DeeWestern

lovesgshp wrote: »

Please give me GT1 to GT11 readings again after a operating time of approx 10 mins on the heating cycle with the system still operating and also all the alarms showing over the last few weeks.

Hi! Here's the readings and 4 days worth of alarms... let me know if it's worth going back even further (v tedious and cold!)

GT1 Off 41.9 Now 40.7
GT2 5.0
GT3 Tgt 48.0 Now 47.8
GT4/5 Missing
GT6 99.0
GT7 Missing
GT8 56.1
GT9 40.6
GT10 1.6
GT11 -1.0

7.1 17520
7.2 9% DHW 91% Rad
7.3 328

Alarms
High HTF Delta 29 Dec 11:55 (GT8/9)
HTF Out Max 29 Dec 11:32 (GT8)
High HTF Delta 28 Dec 19:46 (GT8/9)
High HTF Delta 28 Dec 17:06 (GT8/9)
High HTF Delta 28 Dec 14:13 (GT8/9)
High HTF Delta 28 Dec 12:47 (GT8/9)
High HTF Delta 27 Dec 16:43 (GT8/9)
High HTF Delta 27 Dec 15:05 (GT8/9)
High HTF Delta 27 Dec 13:07 (GT8/9)
High HTF Delta 27 Dec 11:40 (GT8/9)
High HTF Delta 27 Dec 10:00 (GT8/9)
High HTF Delta 27 Dec 06:47 (GT8/9)
High HTF Delta 27 Dec 05:16 (GT8/9)
High HTF Delta 27 Dec 03:47 (GT8/9)
High HTF Delta 27 Dec 02:16 (GT8/9)
High HTF Delta 27 Dec 00:46 (GT8/9)
High HTF Delta 26 Dec 23:17 (GT8/9)
High HTF Delta 26 Dec 23:17 (GT8/9)
High HTF Delta 26 Dec 22:41 (GT8/9)
High HTF Delta 26 Dec 21:28 (GT8/9)
High HTF Delta 26 Dec 20:50 (GT8/9)
High HTF Delta 26 Dec 19:14 (GT8/9)
High HTF Delta 26 Dec 18:37 (GT8/9)
High HTF Delta 26 Dec 23:17 (GT8/9)
High HTF Delta 26 Dec 17:10 (GT8/9)
High HTF Delta 26 Dec 15:43 (GT8/9)
High HTF Delta 26 Dec 15:06 (GT8/9)
High HTF Delta 26 Dec 14:14 (GT8/9)
High HTF Delta 26 Dec 12:14 (GT8/9)
High HTF Delta 26 Dec 10:28 (GT8/9)
High HTF Delta 26 Dec 08:09 (GT8/9)
High HTF Delta 26 Dec 06:34 (GT8/9)
High HTF Delta 26 Dec 05:07 (GT8/9)
High HTF Delta 26 Dec 03:48 (GT8/9)
High HTF Delta 26 Dec 02:26 (GT8/9)
High HTF Delta 26 Dec 01:10 (GT8/9)
High HTF Delta 25 Dec 23:53 (GT8/9)
High HTF Delta 25 Dec 23:53 (GT8/9)
High HTF Delta 25 Dec 22:39 (GT8/9)
High HTF Delta 25 Dec 21:25 (GT8/9)
High HTF Delta 25 Dec 20:11 (GT8/9)
High HTF Delta 25 Dec 18:54 (GT8/9)
High HTF Delta 25 Dec 17:33 (GT8/9)
High HTF Delta 25 Dec 16:36 (GT8/9)
High HTF Delta 25 Dec 16:10 (GT8/9)
High HTF Delta 25 Dec 14:48 (GT8/9)
High HTF Delta 25 Dec 13:06 (GT8/9)
High HTF Delta 25 Dec 11:41 (GT8/9)
High HTF Delta 25 Dec 11:10 (GT8/9)
High HTF Delta 25 Dec 09:52 (GT8/9)
High HTF Delta 25 Dec 08:35 (GT8/9)
High HTF Delta 25 Dec 07:17 (GT8/9)
High HTF Delta 25 Dec 06:01 (GT8/9)
High HTF Delta 25 Dec 04:44 (GT8/9)
High HTF Delta 25 Dec 03:24 (GT8/9)
High HTF Delta 25 Dec 02:03 (GT8/9)
High HTF Delta 25 Dec 00:36 (GT8/9)

lovesgshp

Thanks for the info and no need to go back further with the alarms.
Do not unscrew the nut for the anode on the DHW tank. There should be a smaller knurled wheel on the top which is the air bleed, but we can investigate that later.
The GT8/GT9 delta is too high, hence all the alarms. If the filter is clean, then it is pointing more to the 3 way valve as also the GT6 compressor temperature is reading high on a heating cycle, especially with it only on recharging the buffer tank.
Firstly, set the DHW temp to 52c and be there as it heats, as you need to hold the heating/buffer tank pipe as soon as the DHW switches off. There will be a virtually instant burst of hot water to that pipe as the valve switches over.

lovesgshp

Hi again.
Please try the following steps in sequence:
1) Open all radiator valves fully especially if they are thermostatic valves. Also make sure there is no air in the rad system.
2) Recheck the internal filter.
3) In the I/S menu on manual operation, confirm that the 3 way valve is fully opening and closing. If it is sticking then try some WD40.
4) Check the circulating pump below the filter is free moving. Unscrew the central access point and insert a screwdriver to ensure the vanes are turning freely. Follow that with the manual operation in I/S as above.

Don't think I have ever seen so many GT8/9 alarms before!!!
Can you please send me a better picture of the top of the DHW tank, as I think the air bleed is behind where you have arrowed the anode. It looks like the short pipe that has a sensor lead going round the outside of it.

DeeWestern

lovesgshp wrote: »

Firstly, set the DHW temp to 52c and be there as it heats, as you need to hold the heating/buffer tank pipe as soon as the DHW switches off. There will be a virtually instant burst of hot water to that pipe as the valve switches over.

OK, so I took off the cover and found the 3 way valve:


The right pipe to 'Heating flow' (DHW tank?) on the big box was pleasantly warm to the touch.
The left pipe to 'Flow HP' on the small round cylinder (CH) was hot.

I changed the DHW temperature to 52. The red knob on the 3 way switch rotated 30 degrees:

The right pipe became very hot very quickly.
The left pipe remained hot, but at a temperature where it could be held - just!

The Rear return pipes were both warm, the right being warmest.
I got a delta alarm, and the left and right pipe got progressively hotter.

The DHW temperature kept rising:


And as I knew you wanted to know what happened when the DHW turned off, manually set the temperature back to 48 degrees. The red knob turned back 30 degrees (as in pic 1) and the left pipe got instantly very hot.

Hope this helps!

DeeWestern

As an aside, the manual you kindly sent me says there is a particle filter on the hot side and the cold side -but I think I've only checked one?

It also suggests increasing the speed of the heat carrier pump - does this do anything?