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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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Central heating problem
Hi,
I started to look at this earlier this year, but then forgot as summer was upon me.. I have a gravity primary hot water system, with pumped central heating via microbore pipes to the radiators. The tank-thermo operates a 2 way valve when the tank reachs temp. However when the valve is shut, it stops the water-circuit for the ch, and although the pump is spinning the rads go cold. If I manually open the valve the rads start warming up. I have checked all the wiring against the honeywell C-Plan system, and everything looks ok, and all the wires go live when expected. So I am now assuming that the valve is in the wrong place or the plumbing is a little non-standard ! I experimented with wiring the live from the room-thermo to the 2-way valve, to open the valve when the room gets cold.. and it works.. but of course if the tank-thermo wire goes live, it can "feedback" to the ch pump. And the rads get hot when the room is already up to temp, it can get a bit warm..! Does anyone have any bright ideas how I could wire the room-thermo to open the valve, without interfering with the input from the tank-thermo. I think I need some sort of switch with 2 isolated inputs, and an output if either goes live ? I don't fancy having to replumb the system.. :-) before you ask. Thanks in advance, Paul... |
#3
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Set Square,
I have been thru the wiring, time and again, and cannot see any problem.. but I am always willing to admit a mistake ;-) I wil check to see if when the white goes live, that the orange wire goes live as well to fire the boiler. Maybe a issue with the secondary switch ? Will be back.. Paul... |
#4
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#5
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I did some testing last night. and the wiring seems ok. The orange wire
from the valve goes live when the room-thermo asks for heat, and feeds the boiler to start it. All the other wiring, seems to be correct as well, and goes live when I expect it to. With the pump spinning, and the valve closed, I can feel the input pipe to the pump feels cool. If I then manually open the valve, the pipe goes hot and the rads warm up..I was hoping that it was something wrong with the wiring, but it is increasingly looking like the valve location. Any ideas how I can work-around it ? Thanks, Paul... |
#6
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I did some testing last night. and the wiring seems ok. The orange wire
from the valve goes live when the room-thermo asks for heat, and feeds the boiler to start it. All the other wiring, seems to be correct as well, and goes live when I expect it to. With the pump spinning, and the valve closed, I can feel the input pipe to the pump feels cool. If I then manually open the valve, the pipe goes hot and the rads warm up..I was hoping that it was something wrong with the wiring, but it is increasingly looking like the valve location. Any ideas how I can work-around it ? Thanks, Paul... |
#7
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#8
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It is very difficult to see where the plumbing connections go, as both
the ch heating and hw pipes disapear round the back of the hot water cylinder. For the moment I have latched the valve open, and turned the boiler control down to low, to ensure that the water does not get heated too much.. but this is not ideal ! There must be a way of fitting some sort of relay that will output a live when either / or of the hw & ch inputs are live..? The electrical inputs to the boiler look ok as the orange from the valve feeds the live input to the boiler. |
#9
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