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PostPosted: Sun Jan 30, 2011 10:55 am 
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I'm looking to get a better understanding of how my Honeywell V4073A 3 port valve works so I have a few questions.

Colour code for 3 port valve
White = Heating on
Grey = Hot Water off
Orange = switched live to pump and boiler
Blue = Neutral
Green/Yellow = Earth

Q1
With the hot water off and central heating off is live connected to the Grey?

Q2
With the hot water off and central heating off does valve move to the mid position?

Q3
What does the Grey wire do to the valve?



I can understand live to the white blocks the hot water port and allows hot water to the central heating this also puts a live on to the orange. If HW and CH off I could understand valve moving to mid position, how does this happen is it a spring operation, but I can not understand what the Grey - HW off does

Glassescase


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PostPosted: Sun Jan 30, 2011 12:03 pm 
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Q1
With the hot water off and central heating off is live connected to the Grey?

Yes, the grey gets it's power from the programmer.

Q2
With the hot water off and central heating off does valve move to the mid position?

No, the valve stay's in the last position assuming the stats were satisfied. If the programmer switched off on time control, and both stats were still calling the valve would (spring return) to close off the htg port A.



Q3
What does the Grey wire do to the valve?

The grey sends the valve from the mid position to the htg only port

Quote:
I can understand live to the white blocks the hot water port and allows hot water to the central heating


Nope, the white takes the valve to the mid-position, the grey takes it the rest of the way.


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PostPosted: Sun Jan 30, 2011 12:40 pm 
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hi thescruff,

Thank you.
Can I make sure i have understood correctly? Every time I think I have understood I later find out I have not understood. I do not have a room stat for the CH, I've gone for themostatic valves on the radiators. When I say Hot water off, central heating off I mean the timer has turned them off. The cylinder stat for the hot water may or may not be calling for heat even though the timer has turned the hot water off. I have what I think may be called a 2 channel timer. I can set HW and CH times and durations independently of each other. Its a Danfoss FP715

Q1
With the hot water off and central heating off is live connected to the Grey?
Yes, the grey gets it's power from the programmer.

timer has turned heating and hot water off but live is now or still connected to grey?

Q2
With the hot water off and central heating off does valve move to the mid position?
No, the valve stay's in the last position assuming the stats were satisfied. If the programmer switched off on time control, and both stats were still calling the valve would (spring return) to close off the htg port A.

I don't have a room thermostat for the CH, timer has switched off CH and HW. Dose what happends next depend on what the cylinder stat is doing or does port A (CH) get block off regardless of cylinder stat?


Q3
What does the Grey wire do to the valve?
The grey sends the valve from the mid position to the htg only port

The CH port is blocked off? Water could flow to the HW?



I appreciate your help and advice thescruff

Glassescase


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PostPosted: Sun Jan 30, 2011 1:43 pm 
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First not having a room stat is both silly and expensive.

The white wire must be connected to the htr on in the programmer, so you have nothing to control how much heat goes into the building, for example the rooms could all be 25c and the programmer is still telling the boiler to keep going.

A1, The programmer has two switches hws on & hws off.
The cylinder stat has a Com, hws on, that connects to 1, hws call, or 2 hws sat.
When the program is calling the grey gets it's supply via the Com-2,
When the program is off, the grey gets it's supply from 1 in the programmer.

A2, If you don't have a room stat the cylinder stat, or the htg on program controls the valve.

A3, The mv has 3 possible positions, port B (hws) open, port A&B open or port A (htg) open.


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PostPosted: Sun Jan 30, 2011 7:55 pm 
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sorry thescruff you have lost me.
I thought Thermostatic valves would be a better way then 1 stat. Kitchen, bedroom, hall bathroom etc all at different temperatures, not sure how 1 stat can do that but any way thats a different debate.

I dont understand your replies to my last questions.
Could I go for broke and ask you how you think the timer, cylinder stat, valve should be wired with the itmes I have? I would like to be able to have hot water by it's self, central heating by its self and hot water/central heating on together.

I know this is a big ask but I seem to think you'll know :wink:


Glassescase


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PostPosted: Sun Jan 30, 2011 8:09 pm 
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At least one room should have a room stat to control the boiler, normally the lounge, or a room that doesn't have TRV's.

Yes I know how to do wire a Y plan.

Perhaps it would be better to start at the beginning and tell me what you're doing.

There's two types of 3 port valve, the flowshare or a diverter, give me the model number on the valve.



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PostPosted: Sun Jan 30, 2011 10:20 pm 
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Thanks thescruff.
I have a Honeywell V4073A 3 port valve, Honeywell L641A hot water cylinder stat and a Danfoss FP715 2 channel timer. From the instructions for the 3 port valve it should be able to acitvate in a way to give how water only, central heating only and both hot water and central heating. The cylinder stat only gives instructions covering C and 1 and it seems to work like a bimetal strip
The timer connections are :
1. Hot water off
2. Central Heating off
3. Hot Water on
4. Central Heating on

I want to be able to control the hot water and central heating either having one or both of them on at the same time


really appreciate your help

Glassescase


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PostPosted: Sun Jan 30, 2011 10:25 pm 
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You don't use the htg off connection.


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PostPosted: Mon Jan 31, 2011 10:28 pm 
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scruff, thank you.
I'm not to sure how my wireing has been done but looking at your diagarm I can see that my wiring has a wire missing from the cyilender stat to the pump.
I'll give this a go.

Thank you very much for your time, effort and advice

Glassescase


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PostPosted: Mon Jan 31, 2011 11:51 pm 
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Stick with the same numbers in the diagram and it's easy to fault find in the future.

Any questions please ask first.


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