central heating adding extra pump for minor circulation problem

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hi all
I have fitted a large system with 35 plus radiators over 3 floors everyware is getting hot except one area is only warm , I am going to add a running pump to this area it is a straight run of 4 rads my query is to fit the pump to start of run to push heat through or end of the line to pull the heat through
 
Turn most of the rads of and see if them 4 get hot if they don't your issue isn't pumping
 
I have done this and they do get hot but when I open up whole system an balance it this is the only area room that is cooler ware everyware else is hot , its run of two 35kw system boilers in tandem
 
Unregistered said:
I have done this and they do get hot but when I open up whole system an balance it this is the only area room that is cooler ware everyware else is hot , its run of two 35kw system boilers in tandem
Click to expand...

Is it the furthest room / set of rads on the pipe work
 
Hi there,

As Shaun mentioned you can check by turning off most the rads if there is going to be more heat going through

You may need to turn the closest rads down just slightly open and the furthest rads fully open.
If this doesn't help check if you have got air in the system
Literally you balance your system
 
I take it you are only using the system boiler pumps?
 
Check on which level the heating pump is settled up ? You may have on level 1 or 2
 
Matchless.plumb said:
Check on which level the heating pump is settled up ? You may have on level 1 or 2
Click to expand...

Or even worse pumps too small/ on board boiler pumps and no low loss header
 
Check the temperature of the top and the bottom of each radiator. the top should be hotter than the bottom (warm water rises to the top of the radiator). If it's cooler there is air in top of the radiator, which can be removed by turning the bleed screw at the back or end of the radiator ...

If water comes straight away just leave it open for few seconds to see if a bubble comes up
 
Balance the system really well if you haven't already done so. Do be careful any bypass valve is throttled down or places where a complete bypass can occur - like at pipes to a hot cylinder, although perhaps not done that way.
If those rads are the furthest, I would say it's wrong size pipe work or wrong pump or faulty.
I prefer a big system to have two circuits with separate two pumps & ideally boiler central.
Balancing systems is essential. Any easy route a pump can push water will derate the pumps power.
I went to a standard size bungalow with 3 year old heating system to service an oil boiler and the customer said his far end of bungalow from the boiler had virtually no heat despite him balancing all the rads himself. I discovered he had turned lockshields near off & still no heat in far end. I had a look what was first thing on circuit - a copper cylinder & no valve on it to reduce the flow! I fiited a 22mm gate valve turned well down & customer said far rooms were now roasting.
 
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Did the plumber a power flush by changing the boiler you may have sludge in the bottom of the rads
 
ShaunCorbs said:
Is it the furthest room / set of rads on the pipe work
Click to expand...

yes there on the pipework just its the only cool room the heat is running across them but just at a cooler rate even after balancing down rest of house
 
New system but every system with a new boiler fitted should be flushed properly don't you think :)

Even though you have got new rads ... Old pipe work could cause problems too Shaun
 
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all done m8 pumps on max pipework main flow returns in inch as per design branching to 22 to 15 4 rads of 15
 
Unregistered said:
all done m8 pumps on max pipework main flow returns in inch as per design branching to 22 to 15 4 rads of 15
Click to expand...

You got 28mm straight out from boilers ??
 
hi guys computer not so good thanks for info but its a brand new system pumps on max , im an experienced engineer just never needed a running pump but think this area needs a boost so its either pump or cap feeds at one end and feed 22 up from boiler room which is below room but actual room is furthest away from boiler room ,but pump option if an option is easier hence question .
 
Unregistered said:
hi guys computer not so good thanks for info but its a brand new system pumps on max , im an experienced engineer just never needed a running pump but think this area needs a boost so its either pump or cap feeds at one end and feed 22 up from boiler room which is below room but actual room is furthest away from boiler room ,but pump option if an option is easier hence question .
Click to expand...

If your having problems with the furthest room it's undersizes pipework or too small of a pump what pump is fitted ??
 
[video]http://www.devitto.com/Dom-De-Vitto-DeVitto-Brain-Sprinkles/Dom-De-Vitto-DeVitto-Everything-Else/Dom-De-Vitto-how-to-make-your-central-heating-system-work-properly[/video]


Check here what you may could do.

I cannot see the system to give more tips.

The only thing I would try is close the furthest rad both sides and drain it down take a wet vac or bin bag and try to open up those valves you may have an air lock ...

Helped me a lot... I have done it for couple of minutes and I got read of those issues
 
I put a Grundfos 15/60 on a small school run due to excessive length of run, rang boiler Manu, they advised due to run length that an extra pump was put at furthest point on return,

sorry pressed send send instead of return.

there were only 8 large rads involved
 
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stani said:
I put a Grundfos 15/60 on a small school run due to excessive length of run, rang boiler Manu, they advised due to run length that an extra pump was put at furthest point on return,
Click to expand...

Yea but on a new system that just scream bodge
 
Not really, the system boiler pump isn't big enough for all the rads, ideally this should be low loss header, with either individual zoned pumps or a suitably sized semi commercial for 35 rads
 
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