Ground Source Heat Pumps

lovesgshp

Yes, the tank top is the expansion vessel. There nay be a valve you can close at the bottom of it to refill to approx 1/3 full.

With the spanner, is it a single unit with combined DHW tank, or 2 seperate units, as the valves are different sizes? Yes you will need the circlip pliers to get the filter out. The ground loop one will probably need a stilson, as it is larger.

DeeWestern

The manual says there shouldn't be a valve under the vessel but does say make sure the pump is running when refilling (but then it also says it should never become empty!). Is there somewhere I need to bleed out the air after doing this or is pouring water in literally all I need to do?

I am now more worried about cleaning the filters - the manual had the location of the filters shown and a diagram showing how to take it apart with a regular spanner. But I have a separate white box the same size as the Worcester box, would this be the separate tank for hot water? How would I go about finding every filter?
A stilson wrench is designed to turn pipes, not nuts - is there a guide anywhere as to how to remove the filters that need these wrenches, as I'm worried about introducing a leak to the system over Easter weekend.

lovesgshp

DeeWestern wrote: »

The manual says there shouldn't be a valve under the vessel but does say make sure the pump is running when refilling (but then it also says it should never become empty!). Is there somewhere I need to bleed out the air after doing this or is pouring water in literally all I need to do?
It's ok, we put valves on them. I would suggest filling without the pump on at the moment, then seeing how the level stays. Close any feeds on the ground loop, so you do not lose any pressure.

I am now more worried about cleaning the filters - the manual had the location of the filters shown and a diagram showing how to take it apart with a regular spanner. But I have a separate white box the same size as the Worcester box, would this be the separate tank for hot water? How would I go about finding every filter?
A stilson wrench is designed to turn pipes, not nuts - is there a guide anywhere as to how to remove the filters that need these wrenches, as I'm worried about introducing a leak to the system over Easter weekend.

Yes, you have a double unit, so the filter for the pump HTF side is inside the front casing. I usually use a stilson on the ones here, but if you can get a large wrench then no problem. There are only 2 filters, of which the 2nd is on the ground loop. It should only take you about 30 mins max to clean both, and there should be very little problem about any leaks.
The circlip pliers should have been supplied with the installation.

DeeWestern

So, if I understand correctly, your advice is

• Switch off the system
• Close the ground loop valves
• Open up the expansion vessel, fill up with water to about a third full
• Wait and see if the level lowers over time (it's bad news if it lowers at the point?)
• After a while, open up the valves again and switch on the system

Sound OK? What do you mean by the HTF side?

lovesgshp

DeeWestern wrote: »

So, if I understand correctly, your advice is

• Switch off the system
• Close the ground loop valves
• Open up the expansion vessel, fill up with water to about a third full
• Wait and see if the level lowers over time (it's bad news if it lowers at the point?)
• After a while, open up the valves again and switch on the system

Sound OK? What do you mean by the HTF side?

I think we will have to look at this a different way for the expansion tank, as you do not seem to have some of the features we install.
Follow the manual instructions for filling, but you need to go into the I/S menu to start the ground loop pump manually. Hold down the menu button for approx 10 secs and then select manual operation of all functions. (5.3). Start the heat carrier pump and then do the filling operation. G3/P3 is the command.
As you do not seem to have a pressure valve, it is difficult to see what you are actually operating at for the moment.

HTF, is heat transfer fluid. When you had the alarm, I presume it was GT8/GT9. You do need to clean that filter if that is the case!!

As I asked before, please give the readings of GT1 - GT11.

DeeWestern

Thanks, the refill worked OK. There was some liquid coming in and out the bottom when I turned on the pump, and filled the vessel a third full with water. I then put the nut back on the top so it's airtight again.

The filter was also easy to clean - a 30mm spanner is needed here. There was some, but not very much crud in the filter.

After everything was reassembled, the boiler ran for about an hour before alarming again with an HTF Delta GT8/9 error.

Is there another filter somewhere to clean? I took some photos of my setup as I don't really know what any of it does (2 Worcester boxes, a circular tank, a few vessels including one with a pressure gauge reading zero).

It generates my hot water, underfloor heating and radiators. I've looked at my sight glass - there's some colours around the edge (a key?), but I think the main bit is reading green which is OK - have I understood this correctly?

Annoyingly, this forum doesn't let me post a link to the photos I took - but if you go to imgur dot com, slash a, slash ZUrxv you can see them.

My readings are:
GT1: On 28.9, Now 32.1
GT2: 13.5
GT3: Target 52.0, Now 54.6
GT6: 91.8
GT8: 59.8
GT9: 48.0
GT10: 3.8
GT11: 1.3

Front screen says Rego637W with software v3.12

lovesgshp

I cannot pick up your picture link, for some unknown reason, but will PM you.
Yes, GT8/9 is still at the top limit. Can you let me know what the circulating pump speed setting is set to?
When you took the reading, was it in heating mode, or DHW production?

DeeWestern

Idiot question: how do you see what speed the circulating pump is set to? (and is this the round silver thing in the bottom right of the Worcester box that has the LCD on it?)

The readings were taken when the hot water was on (symbol of a tap) and the house with a squiggle underneath it (UFH?) was on. The house with a + sign pointing in was off.

lovesgshp

DeeWestern wrote: »

Idiot question: how do you see what speed the circulating pump is set to? (and is this the round silver thing in the bottom right of the Worcester box that has the LCD on it?)

The circulating pump we are talking about, is below the last valve you cleaned. It will have 1/2/3 speeds.

The readings were taken when the hot water was on (symbol of a tap) and the house with a squiggle underneath it (UFH?) was on. The house with a + sign pointing in was off.

Readings I need are when heating is on as DHW gets a boost, which distorts readings.

lovesgshp

OK, we need to look a bit further into this.
Open the K2 menu.
Give me all the readings from menu 4 and menu 7.
From your info, I cannot see that you have a room sensor installed (GT5). Is that correct?
Also details from 1.3 through the different settings.