DIYnot
Local | Network
   DIYnot > Forums
Local | Network
DIYnot Network Local DIYnot Network Local  
  Forum IndexForum Index     RulesRules    HelpHelp     Join FREERegister Free     About CookiesCookies     SearchSearch     LoginLogin 

central heating pump flow direction


 
Post new topic   Reply to topic    DIYnot.com Forum Index > Plumbing and Central Heating
Search this topic :: View previous topic :: View next topic  
Author Message
jake47

from United Kingdom

Joined: 27 Oct 2010
Posts: 4
Location: Staffordshire,
United Kingdom

PostPosted: Wed Oct 27, 2010 11:12 pm Reply with quote

Hi ime not a plumber so go easy new here .Due to lack of finances ime fitting a grundfoss central heating pump myself as the old one died on me,stupidly i forgot to take note of the arrows on the original pump re the correct direction of flow.The pipework i can see is some way from the back boiler and is horizontal and i am unable to see which pipe is the flow and which is the return.So my question is how can i tell which way round to fit the pump ?should the arrow go from right to left if the right pipe to the pump heats up first or is it the reverse@help as ime worried about knackering the system. sorry if this is maybe a stupid question ,.
Back to top
 Alert Moderators

If you do not want to see this advert, click here to login or if you are new click here to join free.
stratovarius692

from United Kingdom

Joined: 13 Apr 2008
Posts: 58
Location: Lancashire,
United Kingdom
Thanked: 4 times

PostPosted: Wed Oct 27, 2010 11:23 pm Reply with quote

Back to top
 Alert Moderators
D_Hailsham

from United Kingdom

Joined: 18 Oct 2007
Posts: 8483
Location: Sussex,
United Kingdom
Thanked: 973 times

PostPosted: Thu Oct 28, 2010 9:10 am Reply with quote

Although most systems have the pump in the flow, some manufacturers will allow it in the return.

Maker and model of boiler?

Was the previous pump a Grundfos?

Can't you remember which way round it went from the physical location of the cable, controls etc?
Back to top
The following user says thank you to D_Hailsham for this useful post:
jake47 (28 Oct 2010)
 Alert Moderators
kevplumb

from United States of America

Joined: 18 May 2004
Posts: 23673
Location: Georgia,
United States of America
Thanked: 918 times

PostPosted: Thu Oct 28, 2010 9:28 am Reply with quote

D_Hailsham wrote:
Although most systems have the pump in the flow, some manufacturers will allow it in the return.

Maker and model of boiler?

Was the previous pump a Grundfos?

Can't you remember which way round it went from the physical location of the cable, controls etc?


won't help if the head's been turned tho icon_cry.gif
Back to top
The following user says thank you to kevplumb for this useful post:
jake47 (28 Oct 2010)
 Alert Moderators
jake47

from United Kingdom

Joined: 27 Oct 2010
Posts: 4
Location: Staffordshire,
United Kingdom

PostPosted: Thu Oct 28, 2010 10:47 am Reply with quote

Hi again thanks for your replies i took the head off to check the seals etc the boiler is a Baxi Bermuda 51/5 (back boiler)installed about 6 years ago .The pump is in a cupboard about 10 foot away and the pipes disapper under the floorboards.Oh and the pump ive replaced is identical its a Grundfos Selectric type ups 15-50 130 pn59525609 if thats any help.
Back to top
 Alert Moderators
Agile

from United Kingdom

Joined: 26 Jun 2004
Posts: 52123
Location: London,
United Kingdom
Thanked: 3250 times

PostPosted: Thu Oct 28, 2010 10:55 am Reply with quote

Whilst modern practice is to fit the pump in the flow, when most bacl boilers were fitted many were in the return. It sounds as if yours was a replacement BBU so the pump could have been either way round.

A little trick is to look at the dust on the old pump which would indicate which way up it was.

If you really cannot decide then you could fit it either way and see what effect that has. However, thats potentially dangerous and really my advice would be to get a boiler engineer to advise.

Tony
Back to top
The following user says thank you to Agile for this useful post:
jake47 (28 Oct 2010)
 Alert Moderators
jake47

from United Kingdom

Joined: 27 Oct 2010
Posts: 4
Location: Staffordshire,
United Kingdom

PostPosted: Thu Oct 28, 2010 10:56 am Reply with quote

stratovarius692 wrote:
http://wiki.diyfaq.org.uk/images/thumb/1/14/Y-Plan-Water.gif/512px-Y-Plan-Water.gif
http://wiki.diyfaq.org.uk/images/thumb/1/16/S-Plan-Water.gif/512px-S-Plan-Water.gif


Thanks for the links, however if i dont know and cant see from the pipes which is the flow and which is the return i cant know which way the direction of flow should go.

XX update ime still not sure but i think the direction of flow out of the pump is towards the return so i have put on the heating water and rads and fired it all up and as of now the rads are warming up starting with the upstairs, the pump itself is not making any strange noises so fingers crossed its ok , ime still not %100 and wonder if it was incorrect would everything warm up ok and there be no flashing light at the boilers electronic control which at the moment is showing a constant green light whilst the boiler is lit.
Back to top
 Alert Moderators
Agile

from United Kingdom

Joined: 26 Jun 2004
Posts: 52123
Location: London,
United Kingdom
Thanked: 3250 times

PostPosted: Thu Oct 28, 2010 11:50 am Reply with quote

Whilst you may not be able to notice the problem if its wrong then the boiler stat will not control the flow temperature correctly and would need to be set very low to achieve a sensible flow temperature.

You would also find that for the first minute of starting from a cold system the boiler stat would not turn off the boiler as its turned down.

But there is a 50% chance its correct.

There is also a 50% chance that its incorrect.

Tony
Back to top
The following user says thank you to Agile for this useful post:
jake47 (28 Oct 2010)
 Alert Moderators
kevplumb

from United States of America

Joined: 18 May 2004
Posts: 23673
Location: Georgia,
United States of America
Thanked: 918 times

PostPosted: Thu Oct 28, 2010 12:10 pm Reply with quote

Quote:
If you really cannot decide then you could fit it either way and see what effect that has. However, thats potentially dangerous


cobblers

how in the h ell is it dangerous

just won't work right

---------------------------------------
do you have any of these ?
Login to view this image
Login to view this image icon_question.gif
Back to top
 Alert Moderators
D_Hailsham

from United Kingdom

Joined: 18 Oct 2007
Posts: 8483
Location: Sussex,
United Kingdom
Thanked: 973 times

PostPosted: Thu Oct 28, 2010 1:44 pm Reply with quote

jake47 wrote:
i think the direction of flow out of the pump is towards the return

Do you mean that the arrow on the pump is pointing towards the boiler?

The 51/5 installation instructions only show the pump on the flow; no mention is made of having it on the return. The arrow should point away from the boiler if it is on the flow and towards the boiler if it is on the return.

Can you see any of the pipes connected to the boiler? If so, the upper is the flow and the lower is the return.

Can you get access to the boiler connections? If so tap the pipes with a hammer and see if you can feel the vibration at the pump connection.

If the lower connection has a Tee connection immediately adjacent to the boiler, then your system has gravity circulation for the hot water.
Back to top
 Alert Moderators
Agile

from United Kingdom

Joined: 26 Jun 2004
Posts: 52123
Location: London,
United Kingdom
Thanked: 3250 times

PostPosted: Thu Oct 28, 2010 10:58 pm Reply with quote

D_Hailsham wrote:


The 51/5 installation instructions only show the pump on the flow; no mention is made of having it on the return. The arrow should point away from the boiler if it is on the flow and towards the boiler if it is on the return.

Can you see any of the pipes connected to the boiler? If so, the upper is the flow and the lower is the return.



I appreciate that you are only an armchair adviser who reads information but dont actually do practical work yourself.

However, whatever the installation instructions say there is no reason to believe that any boiler has been correctly installed unless you check it on site. We cannot assume anything. In any case the OP has said that he has lost touch with how the pump was fitted before he touched it.

I also appreciate that you may not be aware of how BBUs are arranged. That means that without dismantling gas parts, its not possible to see the flow and return pipes.

Connecting the pump wrongly means that the boiler is not correctly controlling the flow temperature and that could cause the system water to exceed 100C and boil.

Tony
Back to top
 Alert Moderators
Jake1886

from United Kingdom

Joined: 28 Jul 2010
Posts: 470
Location: London,
United Kingdom
Thanked: 44 times

PostPosted: Thu Oct 28, 2010 11:09 pm Reply with quote

OP maybe some photo's would help with us trying to identify the flow and return for you.

Cool name by the way icon_wink.gif
Back to top
 Alert Moderators
kevplumb

from United States of America

Joined: 18 May 2004
Posts: 23673
Location: Georgia,
United States of America
Thanked: 918 times

PostPosted: Thu Oct 28, 2010 11:25 pm Reply with quote

Quote:
I appreciate that you are only an armchair adviser who reads information but dont actually do practical work yourself.


kettle calling the pan black mister you know jack about the real world

this from the man that has been shot down that many times he wears asbestos skids

dave might be an armchair advisor
but he will admit when he is wrong

last time you did ????
Back to top
 Alert Moderators
Jake1886

from United Kingdom

Joined: 28 Jul 2010
Posts: 470
Location: London,
United Kingdom
Thanked: 44 times

PostPosted: Thu Oct 28, 2010 11:28 pm Reply with quote

icon_lol.gif icon_lol.gif
Back to top
The following user says thank you to Jake1886 for this useful post:
kevplumb (28 Oct 2010)
 Alert Moderators
jake47

from United Kingdom

Joined: 27 Oct 2010
Posts: 4
Location: Staffordshire,
United Kingdom

PostPosted: Fri Oct 29, 2010 3:42 pm Reply with quote

Thanks guys armchair and otherwise it all helps and your quick feedback is appreciated icon_smile.gif .As the left pipe is coming from the direction of the boiler and the pump should be sited on the flow (according to the instructions)and it should pump away from left to right icon_arrow.gif ,thats what ive done and it seems to be ok .I think i would have to take up the floorboards to be 100% ,but all the rads are working and seem ok.So thanks again and btw jake is a cool name ,jakes united i say icon_biggrin.gif .[/u]
Back to top
 Alert Moderators
Search this topic :: View previous topic :: View next topic  
Post new topic   Reply to topic    DIYnot.com Forum Index > Plumbing and Central Heating All times are GMT
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
Similar Topics   Replies   Views   Posted 
Central heating pump and direction of flow? 3 220 Mon Dec 06, 2010 5:12 pm
Flow direction for Central Heating Pump 10 800 Wed Oct 06, 2010 9:28 pm
Quick way to determine central heating water flow direction 3 480 Mon May 03, 2010 3:26 pm
Pump flow direction 2 660 Mon Apr 05, 2004 12:44 pm
Pump Flow Direction 5 2500 Thu Jan 19, 2006 4:22 pm


 
DIYnot
Find an Expert | Find a Supplier | Search DIYnot.com
Network | Advertising | Newsletter
DIY | DIY How To | @home | DIY Wiki | DIY Forum
By using this site you agree to our Terms of Service / Disclaimer.
Please read our Privacy Policy. Copyright © 2000-2014 DIYnot Limited.