"Y" Plan system

oldwasp · 21 Feb 2013

Hi,

I have a system boiler fitted to a "Y" Plan system, the heating is controlled by the thermastat but the water is on constant.

What I would like to know is this energy efficient, i.e the water always on.

I have now realised there is an on/off switch so can turn off the system if I go abroad for a couple of weeks, is this ok to do this.

Obviously in the winter we would come back to a very cold house so is there anyway you can fit a timer to turn the system on or off. I know there is a holiday mode for the heating but this still means the water is being heated for no reason.

Thanks

Jeff

CBF · 21 Feb 2013

I've seen loads of systems without a room stat but none without some kind of programmer/timer are you sure you don't have one ?

oldwasp · 22 Feb 2013

CBF said:
I've seen loads of systems without a room stat but none without some kind of programmer/timer are you sure you don't have one ?

There is a programme timer, but that only controls the heating.

MANDATE · 22 Feb 2013

In a 'Y' plan there is a 3 port mid position valve. The HW is controlled by the cylinder stat and the CH is controlled by the room stat.
You have the option to have CH on without HW or HW on without CH or of course you can select both HW and CH, which means the valve goes to mid position and feeds both until one side is satisfied, then the valve moves so the unsatisfied side receives all the hot water generated by the boiler.
I don't see how a 'Y' system can work without cylinder stat and room stat.
For the above to work you have to have a 'two' channel timer/programmer.
The Siemens RWB29 timer/programmer seems to fit the bill and cater for everything including holidays. I think the 3 modes are 'daily', 'weekly 5day/2day' and 'holiday'

oldwasp · 22 Feb 2013

MANDATE said:
In a 'Y' plan there is a 3 port mid position valve. The HW is controlled by the cylinder stat and the CH is controlled by the room stat.
You have the option to have CH on without HW or HW on without CH or of course you can select both HW and CH, which means the valve goes to mid position and feeds both until one side is satisfied, then the valve moves so the unsatisfied side receives all the hot water generated by the boiler.
I don't see how a 'Y' system can work without cylinder stat and room stat.
For the above to work you have to have a 'two' channel timer/programmer.
The Siemens RWB29 timer/programmer seems to fit the bill and cater for everything including holidays. I think the 3 modes are 'daily', 'weekly 5day/2day' and 'holiday'

Hi,
Yes we have a fast recovery cylinder in the loft which has stat attached and a room stat in the passage and the system uses a 3 port valve. But you mention you can have the CH on without HW i cannot see anyway of doing this. My system has hot water constantly, so the only way to turn the water off is to turn the hole system off.

oldwasp · 22 Feb 2013

Maybe I am wrong in what system I have, I may have a w-plan system.

If I have is it still possible to put the system on a timer so it is all off when we are on holiday and we can set it to come on before we return, like I say not a problem in the summer but winter is a different matter.

Thanks for all the help so far, even if I may have led you astray.

Whitespirit66 · 22 Feb 2013

oldwasp said:
Maybe I am wrong in what system I have, I may have a w-plan system.

If I have is it still possible to put the system on a timer so it is all off when we are on holiday and we can set it to come on before we return, like I say not a problem in the summer but winter is a different matter.

Thanks for all the help so far, even if I may have led you astray.

If you have W-Plan, you can have heating or hw, but not both together. It's a priority hw system, so if ch is on, then hw is turned on, the ch will stay off until the hw goes off. Does this happen on yours?

What make/model programmer do you have? What make/model number motorised valve?

oldwasp · 23 Feb 2013

Whitespirit66 said:
oldwasp said:

Maybe I am wrong in what system I have, I may have a w-plan system.

If I have is it still possible to put the system on a timer so it is all off when we are on holiday and we can set it to come on before we return, like I say not a problem in the summer but winter is a different matter.

Thanks for all the help so far, even if I may have led you astray.

Click to expand...

If you have W-Plan, you can have heating or hw, but not both together. It's a priority hw system, so if ch is on, then hw is turned on, the ch will stay off until the hw goes off. Does this happen on yours?

What make/model programmer do you have? What make/model number motorised valve?

It has the Drayton MA1 Mid Position Actuator and the room stat is a Honeywell CM67

MANDATE · 23 Feb 2013

With a 3 port mid position valve it is a 'Y' plan.
There is something wrong if you can't have CH without HW.
It's a spring return valve and in the rest position the CH port is closed and HW port fully open.
In the mid position both ports are partially open and if the valve was stuck in that position it might explain why HW is always on.Maybe the valve spindle is stiff or something stopping the HW port from sealing when its supposed to be closed
On the other hand you never mentioned the timer/programmer. It's possible I suppose, it could be the wrong type although I doubt it.
With the mid position valve operating correctly and a programmable timer programmer you should be able to achieve your aim.

mikely · 23 Feb 2013

The CM67 is a programmable thermostat so provides timed control of the CH. I assume as you haven’t mentioned a programmer, you don’t have one at all and the HW is permanently on. If so, you just need to add a single channel time switch to control the hot water, such as one of these: http://www.heatingcontrolsonline.co.uk/timeswitches-c-25_40.html

oldwasp · 23 Feb 2013

mikely said:
The CM67 is a programmable thermostat so provides timed control of the CH. I assume as you haven’t mentioned a programmer, you don’t have one at all and the HW is permanently on. If so, you just need to add a single channel time switch to control the hot water, such as one of these: http://www.heatingcontrolsonline.co.uk/timeswitches-c-25_40.html[/QUOTE]

Yes that is my problem I have no control over the HW only the CH, so when I go on holiday the CH can be put on holiday mode only and the water continues to be heated which cannot be energy efficient.

mikely · 23 Feb 2013

oldwasp said:
Yes that is my problem I have no control over the HW only the CH, so when I go on holiday the CH can be put on holiday mode only and the water continues to be heated which cannot be energy efficient.

No indeed. You need to fit a time switch. Sticking with Honeywell, the ST9100C 7 day timer should do the job nicely.

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"Y" Plan system

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