heating control pumps

[andyb]

andy looking at your drawing again you havent put the stat on the back boiler Im just ponting this out just in case we get a back feed when the stat calls for pump #2 to come on so just to go through it again to have it clear in our heads two pumps on with ch1 and ch2 and the oil fired boiler pump #1 on with hw and the oil fired boiler pump #2to come on when the stat at the BACK boiler calls but that pump on only no back feeds to oil fired boiler or pump #1

Sorry vbryne, that has not cleared anything up.
Can you confirm that there is a total of 2 pumps on the system. Both to come on when ch1 or ch2 are demanding, but only one to come on when hot water only is demanding.

That is what I have drawn. For ease in understanding I have omitted other controls so that when my drawing says ch1 or hw this is the signnal from the zone valve after the programmer and any stats.

In my drawing pump 2 comes on with hw only, you can swap pump1 & pump2 if you want.

 

[vbyrne]

Sorry vbryne, that has not cleared anything up.
Can you confirm that there is a total of 2 pumps on the system. Both to come on when ch1 or ch2 are demanding, but only one to come on when hot water only is demanding.

That is what I have drawn. For ease in understanding I have omitted other controls so that when my drawing says ch1 or hw this is the signnal from the zone valve after the programmer and any stats.

In my drawing pump 2 comes on with hw only, you can swap pump1 & pump2 if you want.

andy I tried this to day and every time the back burner called for the pump to come on it brought the oil pump on as well.It could be that I am doing the final connection wrong but it is all ways finding a path back to turn on the oil pump. Could you explain to me what is seperating these two pumps from coming on

 

[andyb]

vbyrne

I thought both pumps were circulating pumps.
Can you do a basic drawing of your layout and post it so that I can see whats needed.

 

[vbyrne]

vbyrne

I thought both pumps were circulating pumps.
Can you do a basic drawing of your layout and post it so that I can see whats needed.

would'nt know how to andy but if you tell me where to go and how you do it I ll give it a bash

 

[Guest123]

"coughs"......#8

 

[silva.foxx]

Is P1 an oil feed pump or a hot water circulating pump?

Are we saying that we have a back-boiler serving a heating system and an oil-fired boiler heating the hot-water?

Do we have a cylinder stat?

How many room stats?

Why do we have a CH1 and CH2 as they both appear to do the same?

How many motorised valves (MVs) do we have?

Is the cylinder twin coil indirect?

 

[vbyrne]

Is P1 an oil feed pump or a hot water circulating pump?p1 is the pump that pumps the hot water from the oil fired burner

Are we saying that we have a back-boiler serving a heating system and an oil-fired boiler heating the hot-water?the oil fir

Do we have a cylinder stat?

How many room stats?

Why do we have a CH1 and CH2 as they both appear to do the same?

How many motorised valves (MVs) do we have?

Is the cylinder twin coil indirect?

Is P1 an oil feed pump or a hot water circulating pump?oil feed pump

Are we saying that we have a back-boiler serving a heating system and an oil-fired boiler heating the hot-water?no we just have two sources of heat heating the water for both the hot water and the central heating

Do we have a cylinder stat?yes

How many room stats?one upstairs ch2 and one downstairs ch1

Why do we have a CH1 and CH2 as they both appear to do the same?ch 1 downstairs heating ch 2 up-stairs heating

How many motorised valves (MVs) do we have?2 on the up and down stairs rads

Is the cylinder twin coil indirect?the way this system works is if the oil fired heating is on it fills the cyclinder with hot water then if ch 1 or ch2 is called for the water in the cyclinder is pumped straight to the rads and the boiler making hot water replaces the hot water in the cyclinder same if hw is called for on the cyclinder if the back boiler is lit which is a all fuel burner there is a stat on the return of that fire and when it calls it turns on pump 2 on to dump any access hot water out of the cyclinder

I hope silvafox I have answered all your questions I have so far over here had three different sparks looking at this and none of them could get it working properly it would be great if some one on the forum could solve this one

 

[joe kane]

Plunber Should have used motorised valves,has he allowed for this in his cost.Dont make your life difficult wire for 2 2 port system.

 

[vbyrne]

Plunber Should have used motorised valves,has he allowed for this in his cost.Dont make your life difficult wire for 2 2 port system.

he has used 2 2port valves one for the heating up-stairs and one for the down stairs rads he didn't put one on the hot water as usual but there is a high limit stat on in its place

 

[joe kane]

You need a hot water valve.A room stat upstairs and one downstairs.Do it this way its the easiest.Dont make your life difficult ,in the end it all boils down to cost.Hes trying to save money.

 

[silva.foxx]

http://www.electriciansforums.net/r...cket.com/albums/ii171/wetwilly_2008/Pumps.jpg

Is this anything like what you're after?

The relay prevents back feeding, two separate contacts.

You may have to correct the labels and will have to adjust the diagram to incorp. MVs and stats.

 

[silva.foxx]

Any joy?