heating control pumps

andyb · May 3, 2009

I've made a drawing in word of what I think you need but I don't know how to up load it to the forum.

Can anyone advise me on this.

Basically you need a 3 pole relay, ch1 feeds the common of the 1st pole, n/o & n/c both go to pump 1.
ch2 feeds the common of the 2nd pole & the n/c feeds pump 2 & the boiler, n/o is not used. These 2 commons are linked.
A permenant live feeds the common of the 3rd pole and the n/o feeds the boiler & pump2, n/c is not used.
The coil is fed from the hot water demand.
This way if hot water only is called for pump2 & the boiler will be on but not pump1.

I hope this is clear but I can post a basic drawing if someone tells me how.

sparks1234 · May 3, 2009

Right lets get to the bottom of the requirements.

Channel 1 requires pump 1 and pump 2 and the back boiler to come on
Channel 2 requires pump 1 and pump 2 to and the back boiler to come on
Hot water requires pump 1 and the back boiler to come on

Is this correct and is there anything else involved

Spudnik · May 3, 2009

andyb said:
I've made a drawing in word of what I think you need but I don't know how to up load it to the forum.

Can anyone advise me on this.

Can you not save it as a jpeg and upload to somewhere like photobucket?

andyb · May 3, 2009

Jason.S said:
Can you not save it as a jpeg and upload to somewhere like photobucket?

I've tried to save it in different formats but I only seem to get the option to save it as a word file.

If someone tells me what to do I'll have a go.

vbyrne · May 3, 2009

andyb I think you have it nearly cracked but you are talking to someone who has never rally worked with relays before,from what you are saying I can get a relay from the wholesalers with three different sets of terminals each one will have its own set of common terminals so in fact a relay is just a two way switch that is switched with the coil am I right in saying that

andyb said:
I've made a drawing in word of what I think you need but I don't know how to up load it to the forum.

Can anyone advise me on this.

Basically you need a 3 pole relay, ch1 feeds the common of the 1st pole, n/o & n/c both go to pump 1.
ch2 feeds the common of the 2nd pole & the n/c feeds pump 2 & the boiler, n/o is not used. These 2 commons are linked.
A permenant live feeds the common of the 3rd pole and the n/o feeds the boiler & pump2, n/c is not used.
The coil is fed from the hot water demand.
This way if hot water only is called for pump2 & the boiler will be on but not pump1.

I hope this is clear but I can post a basic drawing if someone tells me how.

andyb · May 3, 2009

That's right, you can get a 3 pole relay & base.
Each pole has a common, normally closed and a normally open contact.

The coil when energised switches all 3 contacts together.

vbyrne · May 3, 2009

cheers mate I,ll bring all that info away and try it and I,ll let you know how I got on

andyb said:
That's right, you can get a 3 pole relay & base.
Each pole has a common, normally closed and a normally open contact.

The coil when energised switches all 3 contacts together.

sparkygary88 · May 3, 2009

and is that wired by a direct feed to the time clock,then a stat wire from the main bedroom to the timeclock and then a 4 core to the boiler from the timeclock?off the subject here but my mates trip keeps going off,what would the problem be,fault?

vbyrne · May 4, 2009

the way I wired mine is a feed to time clock then I run a four core to a wiring centre in the hot press this is up to the motorised valves to tell the CH1,CH2 and hot water to come on and of course not forgettin the wire from the wiring centre to each roomstat and the stat on the cycinder

sparkygary88 said:
and is that wired by a direct feed to the time clock,then a stat wire from the main bedroom to the timeclock and then a 4 core to the boiler from the timeclock?off the subject here but my mates trip keeps going off,what would the problem be,fault?

andyb · May 4, 2009

I've managed in power point then saved as jpeg as Jason sugested.

As you can see when ch1 or ch2 are demanding both pumps are on.
If HW demands only pump2 is on unless one of the heating channells are calling.

I hope this is clear

vbyrne · May 4, 2009

Your friends tripping fault could be anything is the trip going off all the time or just some times if it is going off all the time turn off all the mcb's and turn them off one at a time that will tell you what circuit it is on and then itis just a case of further investagation but if it is only going off some times it can be a bugger to find

vbyrne said:
the way I wired mine is a feed to time clock then I run a four core to a wiring centre in the hot press this is up to the motorised valves to tell the CH1,CH2 and hot water to come on and of course not forgettin the wire from the wiring centre to each roomstat and the stat on the cycinder

sparkygary88 · May 4, 2009

thanks vbyrne, i checked the house with the rcd tripping and im pretty sure it was a faulty tumble dryer,i dont think appliances should be on the trip side off a board anyway,due to nuisance tripping..

vbyrne · May 4, 2009

sparkygary88 said:
thanks vbyrne, i checked the house with the rcd tripping and im pretty sure it was a faulty tumble dryer,i dont think appliances should be on the trip side off a board anyway,due to nuisance tripping..

you are totally right I have had my fair share of tripping faults I had this one if anybody could throw some light on it I had a 5 amp breaker feeding a lighting circuit and every time I switched the lights on it blew the trip what was doing it was I had a 230v downlighter in a plasterboard ceiling with a metal frame supporting the ceiling and where one of the lights were it was touching a piece of the metal frame and blowing the trip I moved the light away from the metal and everything was fine.I think the light must have been give out a small voltage and the metal strip must have been acting as an earth causing an imbalance

anybody. By the way thanks for that drawing it was really helpful

andyb · May 4, 2009

On looking at my drawing you only need a 2 pole relay.
I've re-done it as attached.
Bit rushed but I think it's clear.

vbyrne · May 4, 2009

andyb said:
On looking at my drawing you only need a 2 pole relay.
I've re-done it as attached.
Bit rushed but I think it's clear.

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

heating control pumps

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