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www.ultimatehandyman.co.uk Forum Index -> Plumbing Forum
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IANNA2004
Junior Member
Joined: 17 Jul 2007
Posts: 9
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 Posted: Tue Jul 17, 2007 7:29 am Post subject: CENTRAL HEATING |
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I have just replaced a manual control valve on a radiator. I bleed the radiator and diconnected the pipes, fitted the valve reconnected the radiator, turned the water back on. then i let all the air out off the radiators. the problem i am having is no i have no hot water. I have a copper cylinder in the bathroom which dose not seem to be hot. I have had the water on all night, but still have no hot water. The wife is not very happy. Does anyone have any ideas as to why. Thanks  : |
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tim'll fix it
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Joined: 18 Jan 2006
Posts: 2137
Location: Leicestershire
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| Posted: Tue Jul 17, 2007 7:37 am Post subject: |
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yes there is an air lock in the cylinder coil.
There should be a bleed valve on the top of the coil pipe work
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IANNA2004
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Joined: 17 Jul 2007
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| Posted: Tue Jul 17, 2007 7:44 am Post subject: |
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| i can not see a valve at the top of the cylinder |
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tim'll fix it
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Location: Leicestershire
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| Posted: Tue Jul 17, 2007 8:32 am Post subject: |
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it wont be at the top of the cylinder but at the side on the top of the two side pipes that heat the coil
is there a drain point on the hot water circuit, try draining some water out of this if so
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IANNA2004
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Joined: 17 Jul 2007
Posts: 9
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| Posted: Tue Jul 17, 2007 8:44 am Post subject: |
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| ok i have had a look. there are 2 copper pipes coming out of the cylinder, at the bottom of these pipes there is a valve with a port that looks like yo attach a hose to. if this is the valve then i have opened it, no air came out, just water. thank for your reply |
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IANNA2004
Junior Member
Joined: 17 Jul 2007
Posts: 9
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| Posted: Tue Jul 17, 2007 9:20 am Post subject: |
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ther is no valve to the side of the 2 copper pipes at the top of the cylinder
thanks for your reply |
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IANNA2004
Junior Member
Joined: 17 Jul 2007
Posts: 9
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| Posted: Tue Jul 17, 2007 9:32 am Post subject: |
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| the 2 pipes coming out of the copper cylinder are hot from the bottom up but go cold half way up. there is a air traped but i dont have a valve to open to let the air out. anyone got any ideas how i can solve this problem. thanks |
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ultimatehandyman
Site Admin
Joined: 16 Jul 2005
Posts: 9740
Location: Darwen, Lancashire
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| Posted: Tue Jul 17, 2007 10:02 am Post subject: |
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I'm no expert on these types of systems!
When you open the hot water tap in the kitchen or bathroom does nothing at all come out?
If it doesn't then you can remove this type of airlock by placing a hosepipe from the hot to the cold tap and then open them both. The mains water pressure will force the airlock out of the pipework.
If you have a monobloc mixer you can hold a towel firmly over the end of the mixer spout and then open the hot side and then the cold side, this should force the airlock out.
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IANNA2004
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Joined: 17 Jul 2007
Posts: 9
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| Posted: Tue Jul 17, 2007 10:48 am Post subject: |
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i have water from both taps h&c. i have just turned the taps on in kitchen, then went upstairs and turned the sink and bath taps on, i also flushed the toilet. when i flushed the toilet the cod water stopped in the bathroom, but was still runing in the kitchen, but the toilet would not fill up. it only filled up when i closed the kitchen tap. i alos dont have any hot water
thanks for your reply |
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tim'll fix it
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Location: Leicestershire
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| Posted: Tue Jul 17, 2007 11:48 am Post subject: |
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assuming you have a standard indirect cylinder
it will look as follows
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tim'll fix it
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| Posted: Tue Jul 17, 2007 11:51 am Post subject: |
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the air lock will be in 5 the coil.
it is good practise to have a bleed valve at point 4 but lots dont.
uhms tip for getting rid of an airlock wont work in this instance as the airlock is not in the hot water supply pipework.
there should be a drain point at some point between 3, 4 and the boiler, try flushing water through this
do you have a 3 port valve ?
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IANNA2004
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Joined: 17 Jul 2007
Posts: 9
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| Posted: Tue Jul 17, 2007 12:06 pm Post subject: |
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I dont have numbers 3,4 & 6. But i have number 1.
Thanks for your reply |
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tim'll fix it
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Location: Leicestershire
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| Posted: Tue Jul 17, 2007 12:08 pm Post subject: |
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you will have 3 and 4 you just may not be able to see them, they may be round the back.
can you post us a picture ???
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IANNA2004
Junior Member
Joined: 17 Jul 2007
Posts: 9
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| Posted: Tue Jul 17, 2007 1:18 pm Post subject: |
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i found numbers 3&4. i opened both of them and let all the air out. the pipes that where half hot & cold are now all hot. hpoefully the cylinder will start to fill with hot water, it will take a while. i will let you know how i get on.
thanks for your reply.......... |
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IANNA2004
Junior Member
Joined: 17 Jul 2007
Posts: 9
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| Posted: Tue Jul 17, 2007 2:07 pm Post subject: |
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I have hot water.....................
Thanks to everyone who replyed  |
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