Bemak Posted April 19, 2022 Share Posted April 19, 2022 Doing a bit of work to the house and had to remove a rad from the system so I got a local plumber to drain the system and remove the rad. He left a young fella back to fix it all up but ever since they've left the system just won't fill back up. The only time I've been able to get the pressure up is when I close the coil loop and just fill the radiators. When I do this the system fills as it should. Any idea why the pressure then drops when I open the coil loop? Link to comment Share on other sites More sharing options...
Temp Posted April 19, 2022 Share Posted April 19, 2022 Air lock in the UFH loops? Link to comment Share on other sites More sharing options...
Bemak Posted April 19, 2022 Author Share Posted April 19, 2022 No UFH. Sorry should have said. Even with air, surely the pressure should still rise? Link to comment Share on other sites More sharing options...
Nickfromwales Posted April 19, 2022 Share Posted April 19, 2022 What is the “coil loop”? Link to comment Share on other sites More sharing options...
Bemak Posted April 19, 2022 Author Share Posted April 19, 2022 Just now, Nickfromwales said: What is the “coil loop”? Sorry, I don't know the correct term - the loop that feeds the coil in the hot water tank. 1 Link to comment Share on other sites More sharing options...
Nickfromwales Posted April 19, 2022 Share Posted April 19, 2022 Just now, Bemak said: Sorry, I don't know the correct term - the loop that feeds the coil in the hot water tank. 2 modes Heating & Hot water. So, is this an S-plan or Y-plan? Basically do you have 2x motorised valves or one. The motorised valves are usually the valves with a metal or plastic box head with a wire going to it. Link to comment Share on other sites More sharing options...
Nickfromwales Posted April 19, 2022 Share Posted April 19, 2022 Like this. Link Link to comment Share on other sites More sharing options...
Temp Posted April 19, 2022 Share Posted April 19, 2022 How old is the hot water tank? Any water coming out of overflows when you try to pressurise it? Link to comment Share on other sites More sharing options...
Bemak Posted April 19, 2022 Author Share Posted April 19, 2022 I don't see any motorized valves in the hot press or anywhere else. All I have in the boiler is a manual valve for the rads and off that another valve which seems to isolate the coil in the tank. Because last night I closed that valve, pressure built up, rads heated but no hot water Link to comment Share on other sites More sharing options...
Nickfromwales Posted April 19, 2022 Share Posted April 19, 2022 Just now, Temp said: How old is the hot water tank? Any water coming out of overflows when you try to pressurise it? It would back ‘leak’ through the grouped return, so isolating the hot water aka coil loop shouldn’t be making any difference? If this achieves pressure filling the heating only, what is being closed to isolate the hot water cylinder so as to get pressure on the heating system? 1 Link to comment Share on other sites More sharing options...
Bemak Posted April 19, 2022 Author Share Posted April 19, 2022 2 minutes ago, Temp said: How old is the hot water tank? Any water coming out of overflows when you try to pressurise it? Tank is old enough but the boiler is now. Installed last year. Don't see any overflow when trying to pressurize the system. Link to comment Share on other sites More sharing options...
Nickfromwales Posted April 19, 2022 Share Posted April 19, 2022 1 minute ago, Bemak said: I don't see any motorized valves in the hot press or anywhere else. All I have in the boiler is a manual valve for the rads and off that another valve which seems to isolate the coil in the tank. Because last night I closed that valve, pressure built up, rads heated but no hot water Pressure? Are you seeing this on a gauge or guessing that you have pressure? Link to comment Share on other sites More sharing options...
Bemak Posted April 19, 2022 Author Share Posted April 19, 2022 Just now, Nickfromwales said: It would back ‘leak’ through the grouped return, so isolating the hot water aka coil loop shouldn’t be making any difference? If this achieves pressure filling the heating only, what is being closed to isolate the hot water cylinder so as to get pressure on the heating system? No idea. I'm not too familiar with it all but my guess is what you suggest, that I was pushing water out of the system somewhere Link to comment Share on other sites More sharing options...
Bemak Posted April 19, 2022 Author Share Posted April 19, 2022 Just now, Nickfromwales said: Pressure? Are you seeing this on a gauge or guessing that you have pressure? Link to comment Share on other sites More sharing options...
Bemak Posted April 19, 2022 Author Share Posted April 19, 2022 That gauge there. 1 Link to comment Share on other sites More sharing options...
Nickfromwales Posted April 19, 2022 Share Posted April 19, 2022 What are you doing to introduce water into the system to gain pressure? Link to comment Share on other sites More sharing options...
Bemak Posted April 19, 2022 Author Share Posted April 19, 2022 Undoing the lock nut on top and then screwing the pin in to introduce water to system. Link to comment Share on other sites More sharing options...
Nickfromwales Posted April 19, 2022 Share Posted April 19, 2022 7 minutes ago, Bemak said: Undoing the lock nut on top and then screwing the pin in to introduce water to system. Crikey. Ok. It looks like the bit you’re “topping up” with is a pressure reducing valve. The purpose of this valve will be to prevent you from over-pressurising the system by inadvertently not fully closing the fill valve back shut 100%. The fog is lifting. What boiler is this please? Make / model? Link to comment Share on other sites More sharing options...
Bemak Posted April 19, 2022 Author Share Posted April 19, 2022 8 minutes ago, Nickfromwales said: Crikey. Ok. It looks like the bit you’re “topping up” with is a pressure reducing valve. The purpose of this valve will be to prevent you from over-pressurising the system by inadvertently not fully closing the fill valve back shut 100%. The fog is lifting. What boiler is this please? Make / model? Ya the black knob at the bottom let's you set the pressure so that it automatically fills if it goes below. I'm filling on the top as advised by the plumber that installed it. Boiler is a Grant vortex. Irish make Link to comment Share on other sites More sharing options...
ProDave Posted April 19, 2022 Share Posted April 19, 2022 4 minutes ago, Bemak said: Ya the black knob at the bottom let's you set the pressure so that it automatically fills if it goes below. I'm filling on the top as advised by the plumber that installed it. Boiler is a Grant vortex. Irish make I have worked on many Grant Vortex boilers and I have NEVER seen that valve used like that. There should be a normal fill loop with a valve each end to fill the system with water until it reaches the correct pressure, then you turn the water off. I SERIOUSLY think you need a different plumber, I think what the existing one is telling you to do is wrong and possibly dangerous. 1 Link to comment Share on other sites More sharing options...
Bemak Posted April 19, 2022 Author Share Posted April 19, 2022 I looked for that fill loop everywhere but can't find it. I'm driven mad by incompetence at this stage Link to comment Share on other sites More sharing options...
Nickfromwales Posted April 19, 2022 Share Posted April 19, 2022 12 minutes ago, Bemak said: I looked for that fill loop everywhere but can't find it. I'm driven mad by incompetence at this stage Relax, stay away from the light! Ok, which model EXACTLY do you have. I’ll google the MI’s and see wtf is going on here. Link to comment Share on other sites More sharing options...
Bemak Posted April 19, 2022 Author Share Posted April 19, 2022 3 minutes ago, Nickfromwales said: Relax, stay away from the light! Ok, which model EXACTLY do you have. I’ll google the MI’s and see wtf is going on here. LoL, link here. https://grantengineering.ie/products/oil-fired-boilers/grant-vortex-external/ It's either the first or second model. Need to check for certain Link to comment Share on other sites More sharing options...
Bemak Posted April 19, 2022 Author Share Posted April 19, 2022 It's a GRANT VORTEX MODULE 50-90 HE Link to comment Share on other sites More sharing options...
Nickfromwales Posted April 20, 2022 Share Posted April 20, 2022 9 hours ago, Bemak said: It's a GRANT VORTEX MODULE 50-90 HE Thanks. OK, the valve you’re fiddling with…..STOP! That is an automatic filling valve which allows the system to self-maintain pressure in the system to a pre set value. Not seen one before, but I have installed these before by buying the components and forging them in. Interfering with that valve is BAD. So, You should have an external filling loop, OR your system is “open pipe” and gets filled by a header tank aka F&E ( feed and expansion ) tank usually up high or in attic space. You need to look for a silver flexible hose with 2 chrome valves either end with taps on one or both. We need to know if this is a sealed and pressurised system or not. Having the automatic fill valve and a pressure gauge does not mean that you have a pressurised system. The plumber is a cock if he didn’t fully explain all this to you. 😑🙄 3 Link to comment Share on other sites More sharing options...
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