central heating only comes on with h water, stumped engineer
- Thread starter bonkersbill
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Hi Dan, the 28mm and 15mm pipes run down the conduit at the side of the chimney towards the side of the boiler, what happens there i dont know
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i dont know if it has been changed pumping wise as it was done before i moved in
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Where is this green wire in the wiring center.
Wiring fault No1 perhaps.
no it looks as though they have just used a 3core flex as
brown = common (1)
blue = neutral (2)
green/yellow = switched live/call (3)
sadly all too common an occurrence
in with the brown/white I would imagine but the pic isn't too clear
Matt
Can you access inside duct? Take a picture.
Hot water return on it own back to boiler by 28mm and heating return by 15mm back to boiler, correct?
Dan.
Nope definitely a blue in with the brown/white.
There's still a pr missing unless they are wired elsewhere.
There should be 3 prs in a Y plan.
htg call/RS 1
RS 3/brown/white
HWS call/CS com
The grey and orange has the correct number of wires.
There's two browns together, could be anything.
And the wrong colour in with the brown/white according to the information given.
which leaves a missing pair.
There's still a pr missing unless they are wired elsewhere.
There should be 3 prs in a Y plan.
htg call/RS 1
RS 3/brown/white
HWS call/CS com
The grey and orange has the correct number of wires.
There's two browns together, could be anything.
And the wrong colour in with the brown/white according to the information given.
which leaves a missing pair.
Yes defo blue just zoomed in I can see that now
from what I can work out the 2 browns are likely to be the hw on from programmer to cyl stat common
yes agreed and it is the room stat connections that are missing so I presume the room stat is connected at the programmer
from what I can see, the top left and top right flexes are boiler and pump
middle right, programmer
bottom right cylinder stat
Matt
Still doesn't make sense, You are suggesting the red to 1 goes directly from 4 in the programmer.
I see the green in 3 has changed to a yellow and where does the blue switch live come from. ??
I'll probably give up on the thread, there's too many conflicts and not enough input from the OP.
Still say it's a wiring fault.
I see the green in 3 has changed to a yellow
and where does the blue switch live come from. ??I'll probably give up on the thread, there's too many conflicts and not enough input from the OP.
Still say it's a wiring fault.
I think the cable knots are there instead of screws to hold the box in place, although they probably also hold up the chandelier in the room below too.
Camel hump and apparent downward slope in the DHW feed from cylinder are the answers to any future 'airlocks' posting. Luckily there's a handy gate valve to speed the job up.
-The two 15mm pipework look like feed & return from a rad. Is there a room with rad the other side of the backboiler?
Having said that, in the photo labelled "22mm to and from upstairs rads" (pic4 top), is it two parallel 22mm pipes with 15mm tees, or one 22mm with 15mm tee and the other just bending round the back of the 15mm? Its hard to see if RHS 22mm run continues after the fitting into the shadow.
-Is that a tee or a bend just after gate valve below the 3 port where its labelled '22 to 28 to boiler'
-Is the '22 to 28 to boiler' pipe run (pic1) going on to become the pipe labelled 'from 3 port valve to under floor' (pic3 top) and then the pipe 'from 3 port valve' (pic3 bottom)?
-I assume the CH gate valve's spindle opens and closes fine and hasn't been sheared (valve below 3 port).
Camel hump and apparent downward slope in the DHW feed from cylinder are the answers to any future 'airlocks' posting. Luckily there's a handy gate valve to speed the job up.
-The two 15mm pipework look like feed & return from a rad. Is there a room with rad the other side of the backboiler?
Having said that, in the photo labelled "22mm to and from upstairs rads" (pic4 top), is it two parallel 22mm pipes with 15mm tees, or one 22mm with 15mm tee and the other just bending round the back of the 15mm? Its hard to see if RHS 22mm run continues after the fitting into the shadow.
-Is that a tee or a bend just after gate valve below the 3 port where its labelled '22 to 28 to boiler'
-Is the '22 to 28 to boiler' pipe run (pic1) going on to become the pipe labelled 'from 3 port valve to under floor' (pic3 top) and then the pipe 'from 3 port valve' (pic3 bottom)?
-I assume the CH gate valve's spindle opens and closes fine and hasn't been sheared (valve below 3 port).
Further to 4xpaws post more detail on the pipe runs are required,
1, pic 1, does the pipe 22to28 tee into the pipe from the 3pv or does it
elbow down through the floor boards?
2, pic 3 bottom, where the pic shows pipe going up through floor boards
is this below the 3pv? and a continuation of the pipe 22to28 to boiler
(pic 1)
3, pic 3 bottom, what is the stub of pipe poking through the floor?
is this the end of the heating outlet of the 3pv?
4, Following the pipework in pic 2 / pic 1, heat from boiler comes up pipe labeled 22mm from boiler, to air sep, to pump, to 3pv in middle port,
from top of 3pv via gate valve to tank coil, OK so far.
pipe from bottom of 3pv via gate valve one would assume would go to heating circuit.
a, If pic 3 bottom is showing floor below 3pv why does pipe from 3pv end below floor?
b, if pipe "22to28 to boiler" is teed into pipe from 3pv, why do we need 2 supplies from boiler one pumped the other gravity, or if pipe connected to boiler return why pump heating water straight back to boiler.
c, is pipe "22to28 to boiler" the return to boiler from cylinder coil?
5, I cannot work out where pic 3 top is taken from, I assume its pipes on top of the floor but where?
6, last question, is it a 2 storey house with boiler on G/F. DHW cyl on 1st floor, with tanks in the loft.
David
1, pic 1, does the pipe 22to28 tee into the pipe from the 3pv or does it
elbow down through the floor boards?
2, pic 3 bottom, where the pic shows pipe going up through floor boards
is this below the 3pv? and a continuation of the pipe 22to28 to boiler
(pic 1)
3, pic 3 bottom, what is the stub of pipe poking through the floor?
is this the end of the heating outlet of the 3pv?
4, Following the pipework in pic 2 / pic 1, heat from boiler comes up pipe labeled 22mm from boiler, to air sep, to pump, to 3pv in middle port,
from top of 3pv via gate valve to tank coil, OK so far.
pipe from bottom of 3pv via gate valve one would assume would go to heating circuit.
a, If pic 3 bottom is showing floor below 3pv why does pipe from 3pv end below floor?
b, if pipe "22to28 to boiler" is teed into pipe from 3pv, why do we need 2 supplies from boiler one pumped the other gravity, or if pipe connected to boiler return why pump heating water straight back to boiler.
c, is pipe "22to28 to boiler" the return to boiler from cylinder coil?
5, I cannot work out where pic 3 top is taken from, I assume its pipes on top of the floor but where?
6, last question, is it a 2 storey house with boiler on G/F. DHW cyl on 1st floor, with tanks in the loft.
David
If you are absolutely sure the gate valves work and the pump valves work, and I mean absolutely sure, next time you drain it remove the valves and be sure they are open when turned to be so. While its off you may as well split the pump and check the impeller is clear to eliminate that possible.
Assuming all the above is ok, I would remove the de-air eject unit and pipe it up as a conventional close coupled vent and cold feed.
If your not sure how, I am certain the experts on here will be able to explain.
Good luck
Assuming all the above is ok, I would remove the de-air eject unit and pipe it up as a conventional close coupled vent and cold feed.
If your not sure how, I am certain the experts on here will be able to explain.
Good luck
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