we only found out tonight the fully spec of the system layout ie trv's etcTake the TRV heads off all the the problem rads and give then a squirt of wd40, and then lift the pin no more then 2-3mm.
Put the heads back on and enjoy the heat.
HONEYWELL V4043 2-PORT MV:
- Thread starter RONCHAM
- Start date
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probably as theirs only 3 of us left on here
left on here
D
davebgas
Not by moi
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That is correct.
Understand the valve is for a C plan, meaning no htg without hot water.
The grey is a permanent live.
The Brown is the cylinder stat com.
The white is the room stat/pump.
The orange is the boiler.
And the tap stat should still be on the return.
D
davebgas
No disputing that, first time I saw the post was tonight and after 6 bottles of mexicos finest!
Honestly, don't think its as simple as stuck TRVs though...
Neither do I because unless they have used a relay for the pump it with never work with a V4043 zone valve.
The v4043 is for a Cplan and gravity hot water.
i don't think its done on a c plan valve but s plan valve as i see before done that way
Can't do that as the cylinder stat also needs to switch the boiler pump on/off via the second valve, otherwise the heating will be on all the time.
Perhaps I'm missing something.
no not as an s plan system but using a 22mm 5 wire zone valve as aposed to a 28mm 6 wire valve as used on a c plan
That's what I just tried to say badly.
You need two sources to control the pump and boiler, and break the connection between the room stat and the MV.
Normal S plan would go;
Grey permanent live.
Browm room stat.
Orange pump and boiler.
Second valve.
Grey permanent live.
Brown cylinder stat.
Orange pump and boiler.
With the one valve I suppose you could control the boiler and pump from the programmer, then open the valve for heating, and not use the orange.
well this was
hw on controlled boiler/pump
then all the valve done was open shut the ch from the room stat on the brown
the grey/orange cut off.
if that makes sense all this system got that my system never was a tap stat on the hw.
hw on controlled boiler/pump
then all the valve done was open shut the ch from the room stat on the brown
the grey/orange cut off.
if that makes sense all this system got that my system never was a tap stat on the hw.
yes must agree worth a look at but then seems like a few issues
have come to light ie tap stat and as mentioned earlier poss crud in system.
no doubt will find out after about 8 pages
have come to light ie tap stat and as mentioned earlier poss crud in system.
no doubt will find out after about 8 pages
This is getting very complicated!! I did say early on that all rads (and HW) had TRVs.
System has been working ok (within its limitations) for 9 years I've lived here!
I don't think it's a Honeywell S-plan, Y-plan or C-plan - just a fully-pumped system with an MV for CH. You're right Seco - the grey/orange/ white from MV are not connected to anything else. The brown from MV goes to CH-on and I believe timer is arranged so there's no CH signal without a HW signal. During an on-period, the only thing I can see that can turn off boiler (and pump) is the boiler-stat??
If pins on TRVs depress and return, is that a good sign they're not stuck??
System has just turned on for its morning effort - I'll give it an hour and see what's hot and what's not!!
System has been working ok (within its limitations) for 9 years I've lived here!
I don't think it's a Honeywell S-plan, Y-plan or C-plan - just a fully-pumped system with an MV for CH. You're right Seco - the grey/orange/ white from MV are not connected to anything else. The brown from MV goes to CH-on and I believe timer is arranged so there's no CH signal without a HW signal. During an on-period, the only thing I can see that can turn off boiler (and pump) is the boiler-stat??
If pins on TRVs depress and return, is that a good sign they're not stuck??
System has just turned on for its morning effort - I'll give it an hour and see what's hot and what's not!!
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