How do I wire this 2 port valve into system?

[heytesto]

Just read what mogget has said. He is correct.

With your method, you will get feedback up the orange wire, down the grey, and into the brown, which in turn will open the valve when it shouldn't.

 

[kevindgas]

 

[doitall]

For this reason the grey wire needs to go to permanent live rather than CH ON, even though it's only needed when CH ON is live.

We know all that, it why the discussion is taking place.

T3 boiler to Prog T1
T1 prog to bathroom stat common
Grey MV to Bathroom common.
Bathroom call to boiler T4

Prog T4 to room stat common.
Room stat call to MV brown.
MV orange to boiler T4.

 

[heytesto]

Anyone seen the op lately?

Done a runner I expect.

 

[mogget]

We know all that, it why the discussion is taking place.

T3 boiler to Prog T1
T1 prog to bathroom stat common
Grey MV to Bathroom common.
Bathroom call to boiler T4

Prog T4 to room stat common.
Room stat call to MV brown.
MV orange to boiler T4.

If the grey wire was connected to the bathroom stat common, the main CH circuit wouldn't work if the Bathroom timer channel was off.

 

[doitall]

The LP241 is 240v only. ie, it doesn't do volt free. Only the single channel progs LP111, LP711, do volt free. In which case you would come off 3 on the boiler to 1 on the prog. However, this is not what he has or needs.

It is fine all you need is a supply from T3 boiler to T1 prog as Kevin said at the start

 

[kevindgas]

With your method, you will get feedback up the orange wire, down the grey, and into the brown, which in turn will open the valve when it shouldn't.

no it won't as there is the small matter of a room stat between grey and brown!

 

[doitall]

T1 prog is permanent live

 

[kevindgas]

If the grey wire was connected to the bathroom stat common, the main CH circuit wouldn't work if the Bathroom timer channel was off.

the OP's design was not asking for bathroom seperate only to stop the flow round the rest of the heating circuit. and both stats come from one time source

 

[mogget]

no it won't as there is the small matter of a room stat between grey and brown!

But if the room stat was calling for heat then the motorised valve wouldn't let go, if the bathroom stat was calling.

 

[Norcon]

no it won't as there is the small matter of a room stat between grey and brown!

Your method is wrong. What heytesto and mogget are suggesting is correct.
That's the way my boiler is wired to bring on the kitchen rad on its own and it works fine.
As suggested earlier by someone its very simple.

 

[mogget]

If the grey wire was connected to the bathroom stat common, the main CH circuit wouldn't work if the Bathroom timer channel was off.

the OP's design was not asking for bathroom seperate only to stop the flow round the rest of the heating circuit. and both stats come from one time source

I must have missed this, I assumed that the OP has a 2 channel programmer because two channels are needed (LP241)

 

[mogget]

Just a thought, if there is only one timing circuit, the OP will have to turn the main room stat down if heat is only wanted in the bathroom.

 

[kevindgas]

no it won't as there is the small matter of a room stat between grey and brown!

But if the room stat was calling for heat then the motorised valve wouldn't let go, if the bathroom stat was calling.

yes in this senario it would hold until the bathroom stat was satisfied, but the heating circuit would shut down the minute the bathroom was satisfied

which brings us back to having 2 valves or accepting this minor inconvienence

 

[doitall]

The Op want's to use the bathroom rad all year.

Its simple, you wire the bathroom stat as a frost stat, T1 Pro to T4 boiler.

All you have to do is keep the MV grey out of the way, and T1 prog/bathroom stat common is the simplest