Astra
Full Member
Posts: 215 
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Post by Astra on Nov 10, 2022 17:18:08 GMT
Hi Guy's Been to look at a job this afternoon the Man wants two new rads fitted not a problem so when I look at these jobs I have a check list to make sure that i am happy with what they have ( ie ) what boiler is fitted and so on Now trying to find the 3 way valve in airing cupboard where hot water cylinder is Guest what NO VALVE in fact could not find a valve anywhere on the system, Boiler downstairs, pump sits just above boiler with heating controls just to the side of the boiler...... OK so what happens when you do a drain down then refill the system, how the Hell do you get the air out of the cylinder coil ....... Boiler is Potterton Profile ( Bullet Proof ) also the heating controls are Drayton standard not a problem ......... If NO 3 way valve how does the boiler only heat hot water when no heating called for, from heating controls and Visa Versa   My Main problem or worry is how to get rid off the air in the system after drain down and refill ?? Many thanks Guy's in advance............ |
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Post by tomplum on Nov 10, 2022 17:51:14 GMT
it could be a gravity system , to check count how many pipes from the boiler, A gravity system will have 4, 2 are F/R to cylinder and the other 2 are F/R to heating, the controls will work the pump so if he wants heating and water the pump with kick in and do both, that system will not do , heating only,
It will drain and re fill as normal venting through the rads and expansion vent
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Post by rocketmanbkk on Nov 10, 2022 17:57:04 GMT
it could be a gravity system , to check count how many pipes from the boiler, A gravity system will have 4, 2 are F/R to cylinder and the other 2 are F/R to heating, the controls will work the pump so if he wants heating and water the pump with kick in and do both, that system will not do , heating only, It will drain and re fill as normal venting through the rads and expansion vent A question I rang Tom about maybe 6/7/8 years ago. |
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Post by battle1066 on Nov 10, 2022 18:35:17 GMT
Is it not a primatic system(A Primatic cylinder or a self-priming cylinder, is a type of indirect hot water cylinder in which the water for the central heating is separated from the domestic hot water by an air lock inside the heat exchanger.)
They use gravity for the hot water and a pump for the heating.
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Post by tomplum on Nov 10, 2022 21:27:12 GMT
yes Battle it could be, if the system has no F+E tank, Its a primatic and both systems need 4 pipes off the boiler, We will know when Astra come back and says how many pipes off the boiler and, It it has a F+E tank,,  |
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Post by crowsfoot on Nov 11, 2022 9:29:43 GMT
I agree with all the above that the primaries are on gravity.
The circulation happens naturally when the boiler is switched on the hot water gets hot.
The pump controls the heating and needs to be running for the heating to work (although it is common for some gravity circulation to the upstairs radiators with the pump off).
If it is a primatic cylinder (no feed tank) then it will vent itself (although they are famous for air locking on refill, so you are right Astra to be concerned about removing the air).
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Post by dickpuller on Nov 11, 2022 10:11:51 GMT
The Potty Profile usually had only one F&R boiler connection, so unlikely to be Gravity HW.
Can’t recall the system name(A,B,C, Y or S Plan) but there was a fully pumped system we used to fit with only one Zone Valve on the CH. Maybe there’s a hidden Zone Valve somewhere?
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Astra
Full Member
Posts: 215
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Post by Astra on Nov 11, 2022 17:26:27 GMT
Hi Guy's Yes there is a F & E tank in the loft I will go back to check how many pipes come out off the boiler ,,,,,,,I really don't think its a primatic cylinder as to my recollection it looked to be a normal looking cylinder,,, please see attached photo of pipes down side of tank ......Many thanks  |
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Post by tomplum on Nov 11, 2022 17:28:29 GMT
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Post by battle1066 on Nov 11, 2022 18:07:41 GMT
Hi Guy's Yes there is a F & E tank in the loft I will go back to check how many pipes come out off the boiler ,,,,,,,I really don't think its a primatic cylinder as to my recollection it looked to be a normal looking cylinder,,, please see attached photo of pipes down side of tank ......Many thanks View Attachment I”ve worked on primatic install with an F&E tank the cylinder only had three connections and the boiler was a Potterton Myson Kingfisher freestanding. It had the facility to pipe up for gravity feed. www.acwilgar.co.uk/Boiler-Manual-PDF/Potterton/POTTERTON%20KINGFISHER%20Mf%20RS%2040-100%20%207.pdfI’ve seen the Potterton Profile has an internal choice of a switch and a temp probe repositions or gravity hot water if i remember correctly. acwilgar.co.uk/Boiler-Manual-PDF/Potterton/Potterton_Profile_40,50,60,80eL_Install_Guide.pdf Page 6 shows both. |
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Post by tomplum on Nov 11, 2022 18:19:57 GMT
Thats interesting Battle, was it a fortic primatic ? They have a header tank but its for the domestic and the cylinder has a Flow and return and hotwater draw off,
Is that the type you mean ??
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Post by battle1066 on Nov 11, 2022 18:23:59 GMT
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Astra
Full Member
Posts: 215
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Post by Astra on Nov 11, 2022 20:43:45 GMT
Ok so you seem to think there has to be a 2 way somewhere in the house Now if I cannot find this valve and I do a drain down do the job fit the 2-off new Rads what is likely to happen on re-fill ? ? really unsure now weather to take on this job or not could be more trouble than its worth ! ! |
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Post by tomplum on Nov 11, 2022 21:20:39 GMT
You can still drain off and refill but, the air locks on an old system are going to be a problem because, there will be sludge and air to hamper the fill up, no one can say either way, a job like this will test your mettle , If you take it on you HAVE to finish it so. price accordingly then put another £100 on top, If they won't pay,,,walk thats what i would do, |
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Post by dickpuller on Nov 12, 2022 7:28:49 GMT
Hi Guy's Yes there is a F & E tank in the loft I will go back to check how many pipes come out off the boiler ,,,,,,,I really don't think its a primatic cylinder as to my recollection it looked to be a normal looking cylinder,,, please see attached photo of pipes down side of tank ......Many thanks View Attachment Hold on a cotton picking minute!!! The way the HW cylinder coil is connected, it certainly looks like a Gravity system!! Four pipes at the boiler is the confirmation it’s gravity👍👍 if there’s an F&E tank, it’s unlikely it’ll be a Primatic Cylinder. |
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