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Author Topic: Solar thermal not circulating  (Read 4073 times)
Iain
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« Reply #45 on: June 18, 2019, 10:53:42 AM »

Hi
I would be tempted to get a proper filling loop connection fitted, Any plumber would be able to do that.
At least you will have an easy method to fill the system. Fill from mains would be ideal if you have a mains supply nearby.
That will allow work to be carried out on the system, checks made and then easy to fill.

An additive can be added later via a garden spray bottle once you are up and running.

You will also need to identify the air vents on the system,

I have put a "T" in my return pipe in the loft. It has a 22mm upstand with a manual air vent on top. Very simple and effective.
Any air settles in the upstand and can then be vented with a radiator key. This is near the high point.
Similar to the one in the picture marked by the hexagon which is the vent by my pump

Iain



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« Last Edit: June 20, 2019, 09:48:11 AM by grevls » Logged

1.98kWp PV (11 x Sharp 180 and SB 2.5)
20 x 65mm Thermal and 180ltr unvented
Powervault 4Kw - G200 Lithium-Ion (LiFePO4)
9000ltr rainwater storage   Plymouth
chris wills
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« Reply #46 on: June 18, 2019, 12:19:17 PM »

Thanks Iain,

I did think that as the pressure vessel is connected to the mains that it fills the system when you open?



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Tinbum
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« Reply #47 on: June 18, 2019, 12:33:02 PM »

Yes it should.
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85no 58mm solar thermal tubes, 28.5Kw PV, 3 x Sunny Backup 5048, 3x Sunny Island 5048, 2795 Ah (135kWh) (c20) Rolls batteries 48v, Atmos wood gasification boiler, Brosley wood burner, 2000lt buffer tank and 250lt DHW
Iain
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« Reply #48 on: June 18, 2019, 02:19:38 PM »

Hi

Quote
Thanks Iain,

I did think that as the pressure vessel is connected to the mains that it fills the system when you open?

Sorry missed that

Iain
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1.98kWp PV (11 x Sharp 180 and SB 2.5)
20 x 65mm Thermal and 180ltr unvented
Powervault 4Kw - G200 Lithium-Ion (LiFePO4)
9000ltr rainwater storage   Plymouth
chris wills
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« Reply #49 on: June 18, 2019, 03:09:13 PM »

Hi,

So my plan at the weekend:

1. Check and photograph the panel on the roof, check for bleed valves and open if present until fluid runs out
2. Fill the system up with water from the pressure vessel to about 2 bar, run the pump and look for full circulation

Anything else, I could do, or is this enough to try for now?
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TT
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« Reply #50 on: June 18, 2019, 04:43:09 PM »

Also give the pressure meter a little tap on the face to make sure it hasn't stuck at the same pressure, giving a false reading
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chris wills
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« Reply #51 on: June 19, 2019, 11:46:29 PM »

So latest update, I went onto the roof, you can see the pictures showing each end of the panels.
Spotted an air valve on the return, so i opened it and yes air did bleed until fluid came out, pictures below.
I then added some pressure where I lost a bit, hardy any really, and then I ran the pump manually and noticed that it was in fact cooling the tank down as the roof temp was less than the tank. I would think that when the roof warms up it will have the opposite effect and warm the tank up.....do you think this is logical?

Only the sun will tell............tbc



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Tinbum
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« Reply #52 on: June 20, 2019, 01:14:00 AM »

Yes that sounds great and it's due to be sunny today so possibly a full tank of hot water..

EDIT- you could do with some propper insulation round those pipes.
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85no 58mm solar thermal tubes, 28.5Kw PV, 3 x Sunny Backup 5048, 3x Sunny Island 5048, 2795 Ah (135kWh) (c20) Rolls batteries 48v, Atmos wood gasification boiler, Brosley wood burner, 2000lt buffer tank and 250lt DHW
chris wills
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« Reply #53 on: June 20, 2019, 06:57:29 AM »

 Fingers crossed.
What grade and type of insulation would you recommend?
Pipe is 15mm.
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Tinbum
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« Reply #54 on: June 20, 2019, 07:52:54 AM »

Fingers crossed.
What grade and type of insulation would you recommend?
Pipe is 15mm.

It's mentioned in the fitting guide refered / linked to earlier.
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85no 58mm solar thermal tubes, 28.5Kw PV, 3 x Sunny Backup 5048, 3x Sunny Island 5048, 2795 Ah (135kWh) (c20) Rolls batteries 48v, Atmos wood gasification boiler, Brosley wood burner, 2000lt buffer tank and 250lt DHW
stannn
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« Reply #55 on: June 20, 2019, 09:00:17 AM »

Well done Chris. Hereís the pipe insulation which is suited to the high primary temperatures.
https://www.navitron.org.uk/store/solar-panels-hot-water/solar-ancillaries/solar-loop-accessories
Stan
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2.45 kWp PV (Navitron supply), 40 evacuated tubes (Navitron supply), Clearview 650 log burner with back-boiler heating cottage and water, 2 off 50W border collies, 1 off 35W cat, 1 off 25W cat.
chris wills
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« Reply #56 on: June 23, 2019, 11:26:33 AM »

Now the weather has warmed up Iím still not getting the heat into the tank.
I went up on the roof earlier and opened the bleed valve with the pump running. I let out air for over 5 mins and still coming out. Is this right? Am I doing something wrong and is this the way to bleed the air?
The pipe on the upper side is really hot but not the n the other. Only hot where the sensor sits showing 100 degrees.
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stannn
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« Reply #57 on: June 23, 2019, 11:56:46 AM »

Yes, all the air must be purged until fluid spits out. 15mm pipe is large for that circuit so more volume for water/air than in a 10mm pipe. Iím assuming that you are re-pressurising with water and not letting pressure fall to zero. Iíve never bled air with the pump running but normally at a cool time.
Stan
« Last Edit: June 23, 2019, 12:22:28 PM by stannn » Logged

2.45 kWp PV (Navitron supply), 40 evacuated tubes (Navitron supply), Clearview 650 log burner with back-boiler heating cottage and water, 2 off 50W border collies, 1 off 35W cat, 1 off 25W cat.
chris wills
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« Reply #58 on: June 23, 2019, 12:16:50 PM »

Ok Iíll give it another go.
Should the pump stay on?
Pressure did not go down too much so I did not refill it
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stannn
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« Reply #59 on: June 23, 2019, 12:24:25 PM »

I would leave the pump off for bleed.
Stan
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2.45 kWp PV (Navitron supply), 40 evacuated tubes (Navitron supply), Clearview 650 log burner with back-boiler heating cottage and water, 2 off 50W border collies, 1 off 35W cat, 1 off 25W cat.
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